ML20092F665

Rev 2 to Instruction Manual, High Speed Phase & Ground Protection for Multiple-Winding & Auto-Transformers

ML20092F665
Person / Time
Site:	Vogtle
Issue date:	05/12/1989
From:	ASEA BROWN BOVERI, INC.
To:
Shared Package
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References
CON-IIT05-002-003-90, CON-IIT5-2-3-90, RTR-NUREG-1410 62-10AG, NUDOCS 9202190460
Download: ML20092F665 (125)

Text

{{#Wiki_filter:~- ^ ,..... a. ~ g_' l2 ~ 3 Sheet 1 of 2 DATA SHEET 3 VENDOR' DOCUMENT STATUS SHEET LOG NO.M V ANF)0 - [c h REVISION O DOCUMENT TITLE: ~ ff h ()fkfyj/4l [) [ g l >1 VENDO C R & : w C u k C d L P.O. DATE RECEIVED h - O/ Y 7 C m T LEcIBtEt TES READ AND DESTROY IF NO IS CHECKED, THE RESPONSIBLE REVIEWER SHALL DETERMINE IF THE DOCUMENT CAN BE USED IN ITS PRESENT CONDITION. IF IT CAN, THE NORMAL REVIEW CONTINUES. IF IT CAN NOT, THE DOCUMENT MUST BE, RETURNED TO DOCUMENT CONTROL FOR REJECTION BACK TO IHE VENDOR. DISCIPLINE REVIEW REQUIRED. %,, STATUS CODE W p/1 APPROVED FOR PLANT USE () MAINTENANCE N. O [] OPERATIONS [] 2 REVISE AND RESUBMIT. V VENDOR MAY PROCEED ENGINEERING WITH MANUFACTURZ SUBJECT TO THE INCORPORATION .[] HEALTH PHYSICS OF CHANGES INDICATED [] CH1:MISTRY [] 3 REVISE AND RESUBMIT. o MANUFACTURE MAY NOT PROCEED () OTHER () S SUPERSEDED BY () V VOID DCNs INCORPORATED: (IF APPLICABLE) I / __ 6~ T;x;iDWM DATE: r/3/M9 NAME OF RESP. D . AND REQUIRED SIGNA M EvGL Suyur /d / LL_.,e DATE: Tlt t/E < a RAME OF RESP. y. AND REQUIRED SIGNAIURE l. DATE: NAME OF RESP. DEFT. AND RIQUIRED SIGNATURE ~ .u. agru8an 8@ S A

c _ __;.l_,,,_, _,,,_ 1..y, e Sheet 2 of 2 4 DATA SHEET 3 ( ) VENDOR DOC 0 MENT STATUS SHEET (NORMS CROSS REFERENCE INPUT SHEET) LOG No. QX 3 A E/o-6 t/ i REVISION _ O EQUIPMENT TAG NUMBER (S) SERIAL OR MODEL NUMBER (S) 2 - /P /6-u 3 - c'/ 2-M f ~ L) SYSTEM NUMBER (S) /M/ b /' %Y ma<s i

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RK 626 500-BA g. 5 inputs -i j SECTION . DESCRIPTION PU BLICATION - ~ 2 GENERAL . Application Guide 62-10 AG t 3' DRAWINGS . - List of Apparatus order specitted - . Circuit Diagram 7454 338-BA . Document-Specil'ication for ADS NY 7454 0005-l' . A.C. Elementary Diagram NY 7454 0005-2 . D.C. Elementary Diagram -NY 7454- 0005-3 . Wiring Diagram NY 7454 0005-4 . Block & Overall _ Logic Diagram NY 7454- 0003 p 4 COMBIFLEX* / COMBITES'!* . Mounting & Connection H'ardware ~ B03-9302 . Item Designation B03-9381 . COMBITEST* B03-9510 5 - TESTING & MAINTENANCE. . -Installation, Testing & Maintenance RK 926-100 E j -- [7 . Test. Instructions 62-10 TI s t: l i ~_ , p 7-y r ih t 2 l-;ij ; )- j = m

5 _ wq PROTECTIVE RELAYS .. Transformer Differential O wom High Speed Phase and Ground Protection for Multiple-Winding and Auto-Transformers =....... gf RL".g vs a, c -$fmmxl ,,,rs - 9 ~ 9.-!; - - y r:. O Tpg - U ~' ~ q 111111 1 lillit lillii D' ~ - i-R.J W: K: A ' @ m$2 m ,: n + e n.n O e Fig 1. Three-pi m transformer differential relay, type RADSE. occupies one 45 (7" high) CoM BIFl.EX@ equipment frame for mountmg on a 17" equipment rack. Auuliary CT's for ratio and phase matching are provided for separate mountin GENERAL The DSE is a static, transformer differential relay with three phases. It has a minimum effect on relay seri-outstanding speed, sensitivity and security. Only one sitivity to an internal fault if one occurs during the relay is required to protect the three phases of a trans-former. There is no lirnitation in the application of transformer energizing period. I the relay as to the number of transformer wmdings,

3. A Sth harmonic restraint, also developed from all or to the number of breakers which may be associated three phases, is used to prevent relay operation due with any one transformer windmg.

to excess exciting currents during transformer over-exc tation. The 5th armonic is preferable to the h Solid state circuitry is used to create three separate 3rd for this function because the 3rd harmonic restraints: currents may circulate mostly m the transformer

1. The variable percentage restraint circuitry provides delta winding and not appearin the relay testraint circuit. The 5th armonic is also to be preferred both improved security to external faults and im-h proved sensitivity to internal faults-when considering possible current distortions due to CT saturation during an internal fault. Under 9

2. The 2nd harmonic restraint circuitry provides im-such conditions tripping is desired and the 5th hat-proved inrush suppression. It is derived from all monic provides less restraint than the 3rd, Device No. 87 T GReg. trade mark

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M E -- _+ ~.- J5 A[J[M UST OF CONTENTS Page SErtlhG DETERMINATl NS GENFRAL 2 1 llarmanic restraugs APPLICATIONS n 3 Sensttinty Setting TA DESCRIPTION 22 4 Imtantaneous Settmg 22 Tra INSTALLATION REQUIREMENfS 6 DC Voltage Taps Field Winn 23 Other Instabation Requirements Or' 6 TESTING 23 12 Acceptance Tests Current Tramformers 12 23 CT Cormectiora Fundamental frequency Tests 23 1"' 12 llarmoruc Re>traint Tests ~ CT Calculatiom 25 14 Indicator Tests 1-BURDENS 26 16 T1ute phase Tests 3-POWER CONSUMPTION 26 16 Inter phase Tests 3., RATINGS 26 16 Calibration 7 OPERAllNG SPEClflCATIONS 17 Fur.ctional in Service Check Out 26 8-Operatmg currents 17 Rot. tine Testing 26 Operating Time 17 27 10-Restraints RECEIVING. IlANDLING AND STORAGE 27 18 DIMENSIONS 11 TIEORY OF DSl! OPERATION 19 APPENDIX 27 PERihh ANCE CllARACTERISTICS 21 Multi tapped single phase 28 28 UST Or IU.USTRATIONS Page ra Tig. I 1hree Phase Transformer Differential Relay,1 e s type RADSE baste version Fig. 10 Example of CT calculation Page 14 11 Un. restrained setting by means ofjumper 17 s 2 Ty pe DSE with test plug handle inserted 4 12 Operating time current characteristics 18 2.8 3 (a) Star dard versiom of DSE 5 13(a) Typical through current restraint charac. 18 i9 (b) An application of a six input DSE 5 tertsdcs 4 DSE with Ave in ut restraints 5 (b) The low cunent region of Figure 13 (a) 18

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Rear view of DS basic version 6 (c) Percentage restraint (slo ) characteristics 18 L3 6 AuxCary CT set 6 14 Functional relatiom wit tin DSE 18b , l.4 7 (a) DSE external connectiom to two winding 7 15 Wave shape and pulse width integrated 20 1.6 ' iramtormer action ' l.7 (b) DSE external connections to three.windmg 8 16 Test set up for checking DSE operating 23 transfonner charactenstics (c) DSE external connections to two winding 8 17(a) Rear view of TEE 4 module 25 W transformer with three circuit.breakets (b) DSE, location and ident10 cation of 25 LO (d) Internal winng of TUC 4 to test switch and 8 modules. Front and rear view ,2 interconnections to DSE 43's 18 Physical dimensiom of DSE, panel dril-27 1 4 (c) DSE extemal connectiom to thise. winding 9 hng and cut out transformer with four circuit. breakers ] (f) DSE extemal connections for Ove and six 10 APPENDIX Fig. I Aux 11 - 'T. tenninal marungs (g) kear f DSE modules showing field wiring 10f afdb nsions f of external connectiora i 'y 8 Details of test plug handle, test plugs, test il switch contacts and method of use -} 9 (a).iusiliary CT connections with wye con-13 r ected u.a.t CT's for ratio matching only UST OF TABua .9 (b) Auxiliary CT connections with delta con-13 Page 2 g nected main CT's for ratio matching only Table 1 Typical un. restrained relay settings 23 6 2 Test of basic DSE with three input restraints 24 9 'I (c) Auxiliary CT connectiom for wye. delta 13 phasing 3 Test of DSE with four input restraints 24 4 Test of DSE with Ove input restraints 24 (d) Auxiliary CT connections for zero 13 sequence suppression 5 Test of DSE with six input restraints 24 s i 5 (e) An alternative to Figure 9(d) when ratio 13 i 6 Variable restraint test data 25 matching is not needed y 94 4 REFERENCE PUBUCATIONS N

i. Sales Information 62-10 Si

e. COMillTEST System 3

l

b. Application Guide 62-10 AG Sales Information 92-11 SI (This publicatimo Application Guide 92-11 AG 1

t. Test Instruction 62-10 TI

.. Accessories: (includes commissioning and servicing)

d. COMBIFLEX System Auxiliary Relays MS 1 21-16 Si lock out Relays MVit 4 25-10 Si Sales Information 92-10 St Maintenance of /.ixiliary Relap -

Application Guide 92-10 AG

g. Price Lists 2

3 .c. ~ 62-10 AG APPL.! CATIONS disturbances have been known to shocx cxcite the The DSE is an instantaneous,1/2-2 cyc)c, three phase configurations into high cunent oscillations at frequen-g differential relay with three separate percentage re-cies unrelated to.the power system frequency. Ade-straint input circuits per phase. Additional restraint quate filtering is within the DSE to make it secure input circuits, when required, are provided for by the during these abnormalities without jeopardizing its use of RXTUC 4 three phase input restraint units. 1/2-2 cycle operating time, These units have input circuits identical to the basic

7. Long CT wcondary leads DSE relay. They mount in the COMBIFLEX 19" Cunent transfonnen may N located at an apprec, frarne with the other DSE modular components.

able distance from the DSE relay location. When this Typical applications are: requirement is verly sente, supplemental a Jxiliary

1. Two-winding transformert auto transformer cunent transf ners may be installed at each end of The basic three winding rejay, Figure 1,is used. The the long CT leads to greatly reduce the effective CT unused, third input is left open circuited. See wiring burden. A 5/l or even a $/0.5 A auxiliary CT at the diagram Figure 7 (a). All of the described relay two ends can reduce the burden of a rnile of secondary characteristics are applicable for this usage.

leads at standard 5 A input to 5 VA, including the re-

2. Three winding transformer quired auxiliary CT's. The DSE will function correctly he complete three input relay is used as shown in with such an arrangement of the secondary CT circuits.

Figure 7 (b).

8. Wye, delta and rig ng conDgurations 3, Auto-transformer ne DSE is provided with separate auxiliary CT's for No special treatment is required. Wiring diagrarn, ratio and phase angle rnatching and containment of i

Figure 7 (b), for a wye wye-delta connected trans, zero sequence current as required with certain power transformer configurations. Thus there are no restrice former is applicable. This includes provisions for load tions on the type of connections used on the main on a tertiary winding. When there is no load, or when CT's. Various CT and auxiliary CT anangernents are there is no tertlary winding, this input to the DSE is shown in Figure 9. When main CT's are connected in left unconnected, as v/ith a two winding transformer, delta at the main CT location the equivalent burden Figure 7 (e). the leads to the relay location is increased by a factor

4. Two winding transformer with dual breakers on of two.Thus the commentsin item 7 above may be one winding applicable for even moderate distances.

6 \\ This would occur with a ring bus, double bus, or

9. Use of instantaneous unit breaker and a half bus configuration. The complete The DSE has an un restrained instantaneous unit three input relay is used without concern for match-ing any specific relay input circuit with any breaker which is responsive to the total ditferential current, le. stion. See Figure 7 (c). Also note section on CT less any de component. Its setting is selected with re-calculations, page 14.

gard to the transformer inrush considerations only. It need not be coordinated with the setting of the

5. Any transformer with four or more breakers restraint unit of the DSE because the restrained relay Tlus configuration could result from a two winding is not restrained by 3rd hannonics. Thirds are the pre-transfonner with dual breakers on each winding, or dominant harmonic in the secondary current from a from multiple-winding transformers, with or without saturated CT. Ilence, CT saturation has no effeet on additional breakers associated with any winding.

the DSE restraint unit during internal faults. The main The basic three phase input relay is used, plus as many purpose of the un-restrained instantaneous unit is to additional TUC 4 three phase input restraint units as provide slightly faster al.d redundant operation for are required. There is no practicallimit to the number severe internal faults, of additional TUC 4 units, nor need they be assigned to any specific relay input source. Thus inputs from

10. Use of sensitivity setting for minor faults strong or weak sources need no special treatment.

The relay sensitivity to internal faults can be set by Figure 7 (d)is typical of this application. To provide means of a selector switch at 20,25,32,40 or 50 per-the necessary test facilities a second RTXP 18 test cent of the relay rated current. The 20 percent setting, switch is provided. The general arrangements for in particular, provides irnproved sensitivities for small these basic relays are shown in Figure 3 (a). windings on large, multiple winding transformers.

6. Long transformer leads These small windings may be on separate bushings or The differential zone of the DSE can include apprect-they may be one of several parallel coils which consti-able lengths of transformer leads. Up to one half mile tute one main winding of the transformer. In either of high voltage cable, or comparable capacitance, can case the difficulty of making definite fault current C e included within the differential zone. While the b

calculations for turn to tum faults makes a differen-tial relay setting as sensitive as feasible very desirable. steady state phasors would suggest no problem, system The 20 percent sensitivity may also be desired where 3 ~

7-1,. a manM ..m ADEA large CT ratios are dictated by other system conditions The componmts are: such as the transfortner breakers in a ring bus or with 1, Test switch, RTXP,,18 a breaker and a half configuration. ^ In Figure 2 the switch hs the test plug handle 11 Use of variable restraint for external fault security RTXil 18 inserted. This test facility pe:mits com-f The variable percentage restraint charactenstic of the plete testing of the relay from this one location n DSE provides exceptional restraint for severe external without any additional, or coordinated actions. ti faults. For example, an error of 40 percent in the L ad checks are made from this same device. Also, effective turns ratio of one set of CT's can be tolerated should it be necessary to block relay tripping, a n ~ by the DSE without improper trip out during an ex-trip block plug RTX11 inserts into the RTXP 18 ~ treme external fault. When expressed in tenus of the without affecting the functioning parts of the relay. lesser of the fault currents to the relay, the restraint Figure 7 (a) to 7 (O show how this test switch ~ approaches 90 percent, even when the relay is set on e nnects into da relay extemal wiring. Rgure 8 ~ the above illustrated 20 percent sensitivity. This cha-shows how the plugs and other accessories are used b racteristic makes the relay suitable for use with auto-with this switch. h transformen or in a system configuration wherein one 2 Phase units, RXDSE 43 transformer winding is directly connected to two or Each of these plug in units, one for each phase, more breakers. In either of these cases external faults occupies four seats in the COMillFLEX frame. may result in very large secondary currents because Each unit includes the circuitry for three inputs, they are not limited by the usual 5-15 percent trans-namely, three sets of air gapped transformers and former impedance, three pairs of power diodes. In addition, the re-g DESCRIPflON quired variable percentage restraint circuitry and the harmonic restramt filters together with thresh - 9 The DSE is available in four standard venions, each old detectors for each phase are located in these I with or without a phase operation indicator SG 1, three DSE 43 units. 3 and/ot MVil 4 lockout relay. The venions are for Four short-circuiting devices type RTXK are insert. 4 three, four, Ove and six winding transformen re. ed in each of the three terminal bases for the phase 5 spectively. units, These devices short-circuit automatically the 7 The basic three phase, three winding DSE relay occu-cunent randonnen e'n any @aw und n renmea " 8 ""' ' pies 19 or 20 module seats of a 4S (7" high) i COMillFLEX equipment frame prewired and ready for

3. Measuring and output unit, RXTEE 4 3

mounting on a 19" equipment rack or on a switchboard This plu g in unit also occupies four seats. It inclu-2 with suitable cut outs made. The basic venion with des the acasuring circuits, sensitivity range selector I phase indicator is shown in Figure 2 together with the switch, power supply regulating ciremtry, dry reed standard test plug handle RTXil 18. The multi re. relay and operation indicator. The mechanical out-straint modellayouts shown in Fig. 3 (a) illustrate the put target in this unit may be reset mechanically or flexibility of the COMBIFLEX design. Any model can by a remote pesh button as shown in Figure 7 (a). ( be simply expanded to more inputs or tripping out-puts if future conditions should change. Fig. 3 (b)is

4. Output tripping relay, RXMS 1 one type of system con 0guration which may result This one seat 3 ms relay is driven by the measuring from enlargements over the years.

i. nit. Tne relay has six output contacts, each capable of tripping a circuit breaker. One contac: is used for energizing the operation indicator in the measur-L

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5. Phase indicator, RXSG 1 y

The DSE can be furnished with this one seat indi-g cator. It indicates whicn phase unit has operated 'y[5 - F? independent of the output trip circuitry. When not 4 specified, the seat is left vacant. / iI '.

6. Input restraint units RXTUC 4 (not shown in i

Kl 7 l a' / / (, Figure 2) k". 7.T' %o Additionalinput-restraint units TUC 4, are used o C. nic "' La *y QT when more than three input restraint circuits are pf' "' required, as shown in Figure 4. This unit also occu-pies four seats. Each TUC 4 is a three phase unit r41 Three phase vanable percentage difrerenhal relay w ith test elug handle inserted The nurnbers uthm brackets denote seat location or circuiting devices. It includes three single phase air-the unatt. gap transformers plus three pairs of power diodes. I 4

J 62-10 AG Each TUC 4 has three output circuits, one for each then occupies nn 85 (14" high)COMillFLEX phase. 'these connect to the respective DSE 43 equipment frattTe. Various combinations am show n Oe input restraint units. These is no practicallimit to in Figure 3 (a). A typical sptem which would re. the number of TUC 4's which can be added to the DSE relay. When TUC 4's are required, an addi-quire sit inputs is shown in Firuse 3 tb). l tional test switcP RTXP 18 is also needed. Thete

7. Lock out relay. HXMYli 4 additional comp nents mount on an additional Another option is a trip unit consisting of a third 4S apparatus frame identical to that used in the test switch and a lock out relay RXMVil 4 shown equipment frame for the basic relay. The relay at lower right of Figure 4. The MVB 4 is energired through the 3 ms MS 1 output tripping relay con-l Three input circuit restroints, botic version O

O,O" RTXP RXDSE 43 RXDSE43 RXDSE43 RxTEE 4 19 3% O-0 0 0 fpyt input circuit restroints 1 1 RxM5 .) e DSE 1 f RTXP RxDSE 43 RXDSE43 RXDSE43 RXTEE 4 (. f 3 4 18 355 c *) 543 5 RTxP RxTUC 4 18 Eh.g input circuit restraints m ~, RMS i 1 RTAP RXDSE 43 RXDSE43 RXD*2 43 RXTEE 4 i 18 3% +@@* 543 ris. 3 (b) one hae diagrarr **ing an arrhcahon or a sis"nput PTxP RXTUC 4 RXTUC4 10

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"'>'iem conditions two or more or these cri may be summed up to one restraint input. .S,_11 in pu t circuit restro:nts &y>,l RxMS j RTTP RXDSE 43 RXDSE43 RXDSE43 RXTEE 4 l, l, l r [ 18 3% .W 4 i W 543 se i RTXP RX T UL 4 RXTUC 4 RX TUC 4 I l -[F - f 1B

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i ,N. g i.* O Note 1: I)f g W Fig. J (a). Standard versions of DST-h r.m All versions can be dehvered with phase indicator SG 1 or additional MS I on seat 35$, "*'d Note 2: All versions eacept the basic can be deuvered with a third test switch and a lock out relay MVD 4 on seat $43, see figute 4. lig. 4. Two additionalinput restraint unit TUC is (nower let ) and Imk.out relay MVB 4 (lower right)in a DSI with the input.restraintt _,._.,....,.____.~._,___k..-,

.4 i i T ASEA l Figure 5 is a rear view of the DSE showing the inter-Field Wiring i connected factory wiring between the individualin& Field wiring is mostly itnninated in the RTXP 18 test dules. The relay is shipped with this witing in place ready for the connection of the CT leads, battery and H h. Position No. I is at the top, position 18 at the I bottom. The wires must be ntted with the ASEA j trip circuits. % hen additionalinput units are required, COh!BIFLEX terminal connectors for insertion into the rela) is assembled and wired in a double sired i equipment frame as shown in Figure 4. ~lhe full op-the respect.ive positions. These connectors are de-tions of the COhlBIFLEX modular approach can be signed electncally for a secure, low resistance cor. tact. used for specific application situations without affect The mechanical design provides a secure capture. They ing the relay characteristics. This includes specifying "I' n t removable without using the provided tool. Du.s extractor, RTXD,is shipped with the relay. l the relay modules in a RilGX 20 relay case for mount, l ing on a switchboard. Depending on the application, some cuernal wiring l i may need to be connected directly to the relay tenni-a a. nals without going through the test switch.This is shown by the slashed lines in Figure 7. The same "~ ~ ASEA wire terminal connectors are used in all cases. The 20 A (larger) connector should be used for all l j currr:rit circuits and for all connections to the RTXP l l / 18 test switch, it can accomodate up to No.12 wire. i 1 / The srnaller,10 A, connector should be used for all l other connections. It can take cp to No.14 wire. e ' l Nl 7 The location of each relay tenninal can be determined - 1 "a' I from its numt er on the wiring diagrams, Figure 7 (a) l na.i nia ou o e, to 7 tf). Figure 7 (g) shows the physicallocation of the mi nui name im neu. j hs $. Rear we* or the tianic Dsf show nng rattory installed inter-wiring in Figure 7 (a) which connects directly to the connect a wiring t,cimeen ihe enodoiet relay modules without going through the test switch. l Figure 7 (g) also i!!ustrates the COhf BIFLEX number-Auxiliary ratio matching and phase shifting trans-ing system. The test system is described in more de-l, formers are furnished for mounting separately. They tailin Figure 8. are shown in Figure 6. See page i1 and appendix 1 for more information on the auxiliary CT's. A typical DSE installation wiring diagrarn for two-l l and three winding transformers is shown in Figure 7 &I (a) to 7 (c). A lock-out, No. 86 function, can be pro-i 4 vided internally within the DSE relay. This may be done by electrically stating in the hts 1 relay sia the contact shown on the alarm function. Or an additional i MVB 4 magnetic latch relay can be provided. When so specified the h1VB 4 relay is wired into the system as shown in Figure 7 (f). Figure 7 (f) also shows the ex-y ternal wiring for nye inputs. This might be a three-ne & Auuhary er set for one windms mounted on a 45 0" h'sh) winding transformer where two of the windings have 19" apparatui rbt two breakers each. The same basic arrangement is used for four inputs as shown on Figure 7 (d) htore INSTALLATION REQUIREhtENTS than six inputs can be provided by simple addition of more TUC 4 modules. The DSE relay has only nominal physical requirements for a successfulinstallation. It is designed to mount in Device 101 is the RTXP 18 test switch, shown in more a stand.rtd 19" equipment frame. The complete basic detailin Figure 8. All wiring shown as fulllines to the venion occupies 7" of rack space, right of this in all of these diagrams is the interconnee-The individual modules are protected by securely tion wiring between the relay modules. The relay is Stted clear plastic covers, All terminals and connec-normally provided with this wiring in place. At time twns of the COhtBIFLEX system are silver plated, of ordering, the proper de voltage should be specified l contact pressures are substantial, leads terminate in for the hts 1 tripping relay. The target electrical reset connectors which directly mate with the module ter-can be encrgized by a 48-60 or i10-250 V de sourc minals to which the interconnected wiring or the separate from the main relay,if desired. For additiona. switchboard leads have been crimped. Corrosive atmos-details on the COh1BIFLEX system and the use of the phere and high humidity should be avoided as a matter RTXP 18 test switch refer to Publications 92-10 Si, of general prudence. 92-10 AG and 92-11 Si and 92-11 AG, respectively. 1

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ll $$ ~ t. i } I '^ " i - i ,,.7* 4, f tg 7 (bl. D5E esternal connections for protection of three. Anding transformers. See f igure 7 (a) for additional field miririg within the ~ my DSE. ( Add suitthary CT": for ratto snatching if requued. T his tarne e i-i < + - 4 connection in used for protectwn of autotransformers (Delete I'd C '- d4 +[A h jl i DSL input if there is no delta minding). .4 a,,, $ l 4 3p mi e

• i.i dC i

e,_ e .i _a d' l'l ~,., ', j e a --* e ,ie is,.1 4 i, ' ~ W* $kl '...<*u.+e..'s>.i....... m 5 t a g i Il as w >....e e_ 3,. _ 4,_:, i ; e i e I taws .o sg m ta el e 3- 't l 1 1 a. a 2 ..] P 1 2 6,.. 1 Add., l l { M"7 g3 ~" alg\\r- _.. E r gt m bI._b l > - 4_m1 \\ .a_a Y l'ig 7 (dt Iactory miring of TLIC 4 to test suitch and interconnections (. - 1 _ds,4 io Dsi. 4 ri <T> ricai of four, rive. or iii inruii) L $r 5 2-*: >!t I t._ M I4, l A 'Ys N V' c'U] ff Ca

w l wo l

'l-,+\\ ' t=. 2 Tn d C sf. (b*... '"[I g;' r '.. U** ai1 u -4 tut. f'ig. 7 (c). D'd external connections for protection of two winding transformer wah two breakers on one winding. See l'igure 7 (a) for additional field wiring within the DSE. I

. ~_ --- - 62-10 AG RA05E u,. r . f..l,l, a 5 1 a 5 t Il 11 ll 111 $Ej- ,m 1 i i 9 2 3 Fa*. / 4 u .6 1-1 -\\ -w? 411t LL _h? l f M 'l. l -~ ~ u __ Lu_ !se Lu _Jmui) q l 3 "-3 ,,_} llLt'U..h _.._. 40g[jpggl ur ' Hy " > [Q l L I,a. w, #., m. a... _ _. .i -I JJ ' L 2.T ~221~.'." l 4 " ' +Jwa NJ L_l!J'I.TZZZ:

~ ;

a V O r* g'L W-- ~ jg_ l,5 qcti + v 4 tr -ir l ,[ -j "h I,- c I ,l f uC 4 ,.~)l kI J I 3 e 1. i, me I. l ..: l o) i, i l m $ 1 . n, a V . =e y, l G. -... *$ I I Ir - I eve:.., v m .e "- 0,0 0 ( I: ll ll ll Il1: ut. c. I is.1 (c). DSI: external connections for prutntion of thace minding transformer with Iour nicuit+teakeri uung one TUC 4. t l i l t l 9 i

4 k.dt: 'it.Defa1ES ADEA pt. _ OdO E. $10f[ a $ t a g t ll Il NPll 1: Il t 3 5 3 -e-T Y bi W bi 11

• t ***W 1 )) 7 Li_ al_.

[ -.______ ad*! + 5u./1 t Z. - ~. p-l% i g. l u _ _,, ii @ dik. T 3-rjt? ,^ "11 l .J c. i g: m-_] [M*"') CLJ h .___f-.{e i j l'h { { 4]j L I _ _L _. l p hj a-(b +, L_-,j j j t----.1 i i'- + - - - - %,,,se,. p ay _ tg.. l .-.q - ~. -__.J TG rq A j "25 l I m,J nrz a c.-__._._____., 3 1 f- + ij l < re,y* li !.') l(6.aa =_ -. -.. u J. p' i u ai i t u.E] + y- . - _. _._ _ 1 y il w,r, 7.V.**-p'* qi%. l J a a i. l' G.] i l.1l.A ll j".1[' 1; .~'1 g L L L1-J a r -; '{ A 4L_ -A J ii . A.q" ~ ~ L I r ~

l. J l

+ t I dj! 's -.4 4% M ei - ir is..L. J !*JT- ' to i VC & j . l a.-c ' " ' L,.H ee -L 4 1

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a-t - -,,-4-.. .m ,= ~ -. i - ( i. =~ +, -.- , to tuc 6 j -.~,.-uip4--., A_'.'.,[ lt t 2 3 j . 6ed 4 tan I a e-.4H.m = 1 a 5 y n 5, l, =- t, "i I

I

_,es. r. 4 s. i 47 ', = gi .+ l 1 %;,,,f. IIj i lI' * --+- un l. fr~CT@ ! w i ' I'@ a lI j '"y'-*- u l er.,.n. n. m n. iii -CXXf0DDD w - - - - - - - - - - -- - - - - - - - - a -j

+

I 0 0 0 D1: c n U ! L,- - ;- _,.-- - ; _ _,- - --.;9_ __ _f_j _ Qd l u t- - t - _ - - r - -i-- J

p flg. 7 (fL D51 connections Ier Inse. and m snputs and circuit-breakers.

__..l t' 2

n. s't '

$h,b {a.dr-bUIO%qp 3opO2hs iM b Da op u.i c3op - i 'e Ah ntunal j "C Cjo Dp I w tres connect g Op D Dp c a. - be oc DC C D,0 [ i t A ude of op DP-?4* p 60 Dp { the test switch u

• e n _wm oo The mah.le number tiidentified g'g J

corner of the relay seat. The too S."P_d 0,,P by the location of the top right P4 SpMDa 4 3

qptJDp, M

series in the location s) stem repre. ~ f sents the top of 4 mountins leveh O r m a 45 equipment frame When b. --4N plug 'n modules are used how eser 'd*" --MOpgp gpIO]b, [t. only lesels 100 and 300 are used. .2 5ee ano T4ure t7 and pubhca. ^C y,0 qp ~ j b; tion 92-10 AG.

DC D.'O D

^ I ID'p p D' h ? y -dGOO j I rs W(p[ I p%qpk, Dp< C D 9 P 1 '- 4Dp ? l Fig. 7 (gt Rear view of DSL modules showing external con. nections - physicallocations of the relay tefrninals to uhkh 76 7.fi~~~' eta' t*ete

• Ikid w tring co.inects accordmg to figure 7 (a).

<tt. e-, u

. - - - - - ~ ~ - - _. - - - 62 -10 AG .~ lest plug handle RT XH 18 Tent plug handle indudes L l 1 ,t j 2 plus pins tot

• and - la sted at the top 16 test plugs fitted in all temammy gates n

e h and bottom of the test plug han:lle. L'wJ m the test plag Nndle lhe se w4tc t+th g for suppl) ot de soltage to the Irst equip-tipes of s ontacts i e those he tog a l / nir nt t his pin Jees not epen ans s ontac ts sontatt tip nsar the tront of the tr t f [ ~ lf j mitt h. mienJed foi trip utruito anj i y ( those with a t ur ta t hp it r thi r mude. / ' f W entenjed for it.rernt anj settan. r, tots I s s; e / S080141.PO511)O M 11tl POstilO M i v.~., ] ,n 4 .,m, + f t, Dr = A h [f .a p \\.. h 1 wm N .3 l 4 ta'tw g -~ b-.7 { ( w J % A +~ m O i 7 13 ? na% % a, h c i A >- A f &,s / -~% \\ ~ w l(site plugs Carte rd ir tmg of ril.n sp%to.ns ) to 141 1he ammeter test plus RIXhl n used separatel> tot scrue current measurement _ li incorporates Af , U *' + Z $ o an eservoltage protestion consistmg of a pas +- - tube An are occurs at vpros 300 V and short ortusis the current if this is opened by maitake O'. "*C O f or af the plug is inserted in the test su itch w sth-out an ammetet Connected to the plug. A IS w, w i M A rnetal contact is heated up by the arc and takes oser the short (Itculting ./ B* O Lo4J current measuremt hr (poutions ) to 14) lest suits h (ontastfor _____--W w . _ + - irYi I (Y .p,0 p t 14,1 0 t ; '" - .. =u. To Top Too ta k t ^M gnog g Cenecnon j n .7,., s >--~

• AY The inp-block plug PTXB is short and h uscJ n,m e

separate!y for blos king trip cucuits. It can also g *--- h be uwd for measurement purposes it' trip circuits The plug ti red to draw attention to the fact that blxking has been carried out. The door of the ham ovta,t interruptmn or blodmg of a de uti tut or COMBli Lt X equiprnent frame can be closed i, go, n),y,,, far tin;e measurement of trip puhri etc shtje the plus remams inserted in the test switch. lest switeh 10 3 4(~ contact for - -. '~ i ]' h h,.-- ,.e - l.14 8 Lktails of test plug handle, vanous test plugs test suit 6h ten-try art uits --m. taas and method of u e y pggg,nn, y, 15.16. I D '"' l l l l1

A t. m. AOEA Other tratallation Requirements mediate current level of 0.5 A is suggested. This my The type MS 1 output tripping elay has five output requae a sec n3 set of SLCE 12 auxiliary C1's 1 U e contacts in addition la the one used for the operation '" Y' "# " I^' \\ fr. indicator Each is capable ofinpping a circuit breakrr. Y )r Four contacts are factory wired through the RTXP 18 test switch. There are no polanty or other restnetions on how there MS I contacts are utilized within their g7 gg tatmg. The RTXP 18 test switch has a tontinuous rating of 20 A per contact. It can accomodate a total The determination of the turns ratio of the auxiliary of four output trip circuits m the basie relay. When CT's and the phasing connections is conventional. In ~ ~ ~ one or more ll'C 4's input restraint units are used, general, pmdence in transfonner differential relay cir. an additional RTXP 18 test switch is provided with a cuits suggests no additional devices connected into the 3 total of 18 additional test circuits as shown in Figure differential CT eircuits, llowever, frorn a burden view-I 7 (dh te) and i11 Electncal and inechanical details ofpoint, the DSE burden is negligible and with suitable the RTXP 18 test switch are shown in Figure 8. capability in the main CT's additional devices can be meluded in the DSE circuitry. Current Tramformers When additional burdens on the DSE CT% are a Type SLCE 12 multi-ratio current transfonners are quiretrint, the Mexibility of the separate ratio match-n ing CT's can be further utihred. The main CT ratios furnished for ratio and phase angle matching, one set and phase connections (wye at delta) can be selceted for each of the specified inputs. These are mounted in sets of three on 4S (7" x 19") apparatus plates as to meet the requirements of the additional devices. 5 3 shown in Figure o, for mstalling in any convenient The ultimate ratio and phase relations for the DSE { location. Appendix 1 provides complete mechanical can then be provided by the SLCE 12 auxiliary CF's. details as well as information for selecting the desired The phase relations of the cunent circuits should be turns ratios within i 3 percent, and the ampere rating. detennined before the auxiliary CT ratios are calcu-l Current tramformer accuracy requirements are based lated. There are three requirements for the auxiliary CT's. on their performance during external faults, not in-ternal. At high currents the DSE has a 045 slope.

1. Bring the cunents from every source of a giver This allows over a 40 percent error in CT ratio before phaw into phast an undersired over tripping would occur. Selection of CT's with 10 percent accuracy at maximum esternal

2. Bring the cunent magnitudes from every source into hannony.

fault cunent or at 20 times rating which everis greater is suggested. This will allow adequate margins for pos-

3. Suppress the zero sequence (ground cunent) com-sible CT saturation due to any dc component. When ponent to avoid improper operation on external faults.

X/R ratios dunng external faults are over 75 severe CT saturation may not be preventable. In such cases I,1gure 9 shows the several methods of connecting the symmetry in the affected CT secondary circuits and main and auxihary CT s for reaching thew objectives. equal burdens will enchance the security of the sys-With the power transformer connected wye-delta, tem. These situations only occur with breaker and a half or other configurations where the power these objectives are most easily satisfied by connect-transfonner size has little relation to the extemal fault ing the main CT's inversely, that is m delta /w> e re-current magnitudes. spectively. A zig zag wmding of a power transfonner will have a phase relation similar to a delta which For rated accuracy at 20 times rated current the I A "* "D "4"N#5 "" ' "" U "' N " " U"' model of the SLCE 12 can accept 2 O wcondary lead ing zag neutralis usually grounded, the CT's on a rig-burden or about 1000 feet of secondary wiring; the zag win ng u in cha r era to mppuu 5 A model can accept 0.1 O or about 50 feet of wiring the mo sequenu now. Two meh refsequena wm between the CT's and the relay. Appendix I provides complete details on SLCE 12 capabilities. When the DSE relay is to be located a significant dis-The CT connections will have no effect on the har-tance from the main CT's, total CT burden can be re-monic re>traint action of the DSE This is because the duced by locating the auxiliary CT's near to the main rectified 2nd and 5th harmonics from each of the CT's. By using a DSE relay rated 1 A and converting three phases are combined for a common harmoni to this cunent level with the auxiliary CT's. the burden restraint. Thus, the relative effect of these hannon of long CT leads can be greatly reduced with no ill to the fundamental at the relay will be independent affect on the overall relay performance. For excep-of the connections of the power transformer and the tionally long CT leads. (over 1000 feet), an inter-CT's. The 3rd hannonic is the one most affected by CT connections and this is not utilized for restraint 12

,.,., y 4,3 62-10 AG in the DSE. Special CT connections are not required R S i for the 5th harmonic overexcitation restraint, 3 [\\ Some power transformers, due to their construction, j have " hidden" tettlary winding elfects. This results

. s h ie nost in some of the currents, normally assumed to be flow-

] I ing in the delta, to flow in fact in the transfomier case J t' r - c c g, and other mechanical parts of the transfonners during ( 0 0 severe external ground faults. Therefore, connection 3-13 p of main CT's inside the delta of main CT's inside the delta of a power transformer may not rueasure the total effective delta current, This conneetion is usually ,,,. q,,3 4,,g,,,y cr connectionn foi u te-delta phaung uith or w ith-not recommended with the DSE, The 5th harmonic out rino matc hing requirementi. restraint characteristic of the DSE does not require sot,: Ausdi,,y cT deita should be maae up ="h the me rearities this corinectiort with its attersdant cornplex calcula-and interchase u tring si the rower transformer tions. R S T R S T 1 2 3 1 2 3 JL ~ ~ 3 p p-4# 1, R' J t r, s

1. 5 ' te nW to AAD5f s

q -q 4-- co w u to',9av 0 Da et _est.easi Fig. 9 (at Austhary CT connections with wye connected mam CT's ror lig. 9 4d) Ausdiary CT connections for aero sequence suppresimn istto matchmg only. when w >e-delta phase shif t is not acceptable. R S T R S T l ? 1 1 2 3 t, R I tR 2 s(> 1e RAD 5E g, 5 i,g473g l ~ r - 3, f 3, 1 7 ,7 7 i E ))] O. N 00 not connect to re a, O. 9 (b). Austhary CT connections with delta connected main cts for W l viis ratio matching only. Note: Main CT delta thould be made up mith the same polarities and I-ig. 9 te). An alternatne of Figure 9 (d) ror reto sequence supprenion interphase wuing as the power transfornier winding. when ratio matching is not needed. 13

-c p, y. - - r *- ES m /t c:m-

• I ASEA CT Calculations

2. Select an overall CT ratio for the largest kVA win The following illustrated procedure will result in the ing to yield about 5 A to the DSE.

proper sires and ratios for the main and the auxiliary CT's. 565 = 113/l on 138 kV winding

1. State the problem by listing all soltages'), kVA 5

ratings, overload requirements, line currents * ), w ye and delta windings, dual breakers, etc. For example: (But note, as in step 5, that the load flow through A 138/34.5/13.8 kV, delta wye wye power trans-the two 34.5 kV breakers may be the maxirnum former with a rating of 100/60/60 MVA on the re-kVA value to which the system must be designed). spective windings, see Figure 10 has a 135 percent Other requirements would probably suggest a main overload requirement. The 34.5 kV winding will tie CT ratio cf 120/1 or 600/5 A. No auxiliary CT into the system with two breakers in a ring bus would be needed with a ratio this near to desired scheme. The exact voltage taps will be determined value. Ilowever, assume exactly 5 A is desired at in the field, but it isjudged they will be v ithin 5 the relay, percent of the nominal values. auxiliary ratio = 'I Note: These voltages and currents should be the selected tap values of the power transrormer, not the system rmminal voltages, 113 (deiltea) in the case or tar changtng under load trana. ners. at ta sustom. = 0.942/1.0 or 4.71/5 A ary to adect the mid salue of the operating range. I20 (main CT) l From table 3 of appendix 1 the turns ratio of O,g,s, " '" SLCE 12 for this input current should be 44/42. 2"" _q,s,<] sesa w 3 [ eu. Y 61/ sa c'Y a uso a "I 1 (

3. Determine the overall Cr ratios for the other two ise s

• n yrs",ses*

windings, these will be inversely proportional to g T* the voltages (ignore the kVA): j, s "l I ') 138 kV 34.5 kV ratio = 113 x = 452/1 C 34.5 kV sy I is 10. Lsample u-d in sample ci cakulaten5-If 400/1 main CT ratio (2000/5) has been selected "> N te Auuiary ci not generauy needed. see item 2 delow. for other purposes, the auxiliary ratio becomes: a. C N'M u = 1.13/1 or 5.65/5 A on 34.5 kV Fc Determine the maximum line currents for each 400 (main CT) winding "E The turns ratio for the SLCE 12 would be 31/36, n ng except for the delta considerationt - see step 4. b ihne x overload factor f bet 50 x (line-line kV) @,'ld,T[u'id",,3lp f"'k"$ d' " ' " '**1') t thn calcu. 5 cor 138 kV wt' 100.000 13.8 kV ratio = 113 x - = 1130/1 g 1138 x 1.35 = 418 x 1.35 = 565 A 13.8 kV

tan, g/3xg33 du?

If the main CT's have already been chosen to be 60.000 1200/1,(6000/5). the auxiliary ratio should be: I 134.5 x 1.35 = 1001 x 1.35 = 1360 A = ofh t6 x 34.5 1130 t affe = 0.942/1 or 4.71/5 A on 13.8 kV winding 1 tion 1200 60.000 113.8 x 1.35 = 2510 x 1.35 = 3390 A The turns ratio for the SLCE 12 would be 44/42, s/ x 13.8 3 except for step 4. 12 .a

i .m.;. ./ " M o <p. 62-10 AG

4. For those windings requiring delta connected CT's, ever, since it was rioted that operating experience T

Increase the overall ratio by 1.73. It does not matter may require a change in taps on the main CT, the [h where the delta is made up,in the snain CT's or in auxiliary CT's would probably still be used to pro. the auxiliaries, the overall ratio will be brought into vide for future conditions. hannony in the auxiliary CT's. In this example, both the 34.5 kV and the 13.8 kV will need delta CT's, so the auxiliary satios become:

7. Tabulate the burden on each set of CT's based on the final ratios as detennined in step 6. For the 1.73 x 5.65/5 = 9.76/5 A, or 22/42 turns on illustration, assume (for the 34 kV CT's):

SLCE 12 for the 34 kV ci mondary. moms 2.3 miniohm per turn x 600 eurni 1.5 0 1.73 x 4.71/5 = 8.15/5 A, or 22/36 turns on 5"caJary leadt 300 (z 2 e ay) No. 9 u tre 7$'C 1.00 SLCE 12 for the 13 kV. Au'd*'y er (2 v4 burden raians ai $ A> a 2 o.16 0 DSL resuaint burden (0J 8 vA at $ A a ($/6.5)2 s 2) 0.01 0 other burdens

5. Review other operating requirements for other CT

-Q needs. The two breakers on the 34.5 kV winding 7,,,3 3,,,,,,,,impo ed on mun 34 sv ers 2.67 0 snay have an additional requirement of being able to transfer power through the bus in addition to the transformer load. If this results in possible cur-

8. Calculate maximum secondary voltage on the main rents in excess of the 2000 A rating of the selected cr s, which could occur for a severe external fault;

( CT, then a higher rated main CT would be required. ignore possible asyrnmetry: Assurne a 3000 A capability may be needed and a E 'C = 1 'C x Z . 3000/5 or 600/1 main CT is selected. The auxiliary 5 5 5 CT then becomes: Assume: 40,000 A (2,400 MVA) can now through 452 (desired) one of the 34 kV breakers for an external bus fault. = 753/1 or 3.77/5 A CT secondary current = 40,000/600 = 66,7 A (w 600 (main CT) CT secondary voltage = 66.7 x 2.67 = 178 Y r '] Determine this for each set of CT's. If the auxiliary And since this winding requires a della CT connec-CT's are to be located a significant distance from tion, the selected auxiliary CT ratio would be the DSE relay, the capability of the SLCE 12 CT s should also be checked as shown in Append. 1. 1.73.x 3.77/5 = 6.5/5 A with SLCE 12 turns ratio in this example, and allowing 0.10 for the switch-of 31/40 for both sets of 34.5 kV CT's. board wiring from the SLCE s to the DSE, the SLCE's maintam their accuracy up to 125 A. Since the overall ratio has not been changed, the k current to the DSE from these CT's during the 3000 A emergency through loading becomes:

9. Specify CT secondary voltage accuracy class no less than this maximum voltage calculated in step 8, or 3000/452 = 6.64 A a C 200 in this illustration. Additional margin is not necessary. For inrush considerations, the volt-This is well within the rating of the DSE; llowever, age accuracy class should be at least equal to the the capability of the auxiliary CT's at this higher voltage developed at 20 times rated current or to current level should also be checked. Also,if this the actualinrush current if known.

requirement should have resulted in a relay current larger than desired, then this larger primary current Note: There is no need to make any CT calculations should be used as the determining maximi'm kVA for internal faults. The relay will properly respond and the other ratios brought into agreement with it. to internal faults up to 100 times rated current (500 A at the relay).

6. Determine if any of the auxiliary CT's can be elimi.

10. Where available C1's cannot provide the voltage nated, in this example the 138 kV auxiliaries are needed in step 9, there are several options avail-within 6 percent of a 1/1 ratio. Thus they could be

able, eliminated with only a 6 percent reduction in relay a) Install auxiliary CT's at the main CT's to re-current. The overall ratio becomes 120/1 on this largest winding and the other CT ratios would then duce the current to a 1 A level and use a 1 A DSE relay. This solution greatly reduces lead be recomputed to maintain this overall ratio. Ilow-burden.

DS

JJ =

• mw ; g A c g: a ASEA pOWEll CONSUMPTION b)Use larger wire for the secondary leads to te-duce the lead burden. Tt is expeme is usuaHy

.(({g gg g g, 3 not warranted in siew of the other options ly for operation at any de control voltage 48 Y and y. A abose. The highet voltages require more power in c) Install auxiliary C T's at the main CT's to re-view of the nearly constant current requirements of l duce the current levelin the secondary wiring the internal voltage stabilizing circuits. Appt Umate condnuous & power requirements at ent s ep up adj s rn t in th au i a rated tap voltages: ratio at the relay. The one ohm lead burden in 48 V 3.0 W the illustration can be substantially eliminated 60 V 3.5 W by this method, but requires an additional set I10 V 5.0 W of CT's. l25 V 6.5 W d)When auxiliary CT's are not needed for ratio ,,0 V 9.0 W correction or wye-delta phase shift, the burden

• 0 V 10.0 W can be reduced by selecting main CT ratios to The MS 1 output tripping relay requires an additional yield only 2 - 3 A during maximum load con.

7 W when it operates. ditions. This of course reduces the sensitivity of the relay, but the DSE has a minimum pick-up setting aslow as 20 percent of the 5 A (or g 1 A) rating which may still yield a satisfactory sensitivity. e) Connect main CT's to a higher ratio and com-pensate with a current step up ratio in the auxiliary CT's at the relay location. The lead burden will be reduced by tne square of the increased CT ratio. In the illustration, doub-ling the main CT ratio will reduce the required secondary voltage to 72 percent. Note that the internal resistance of the CT increases with an increase in the number of secondary turns, thus reducing the net benent gained from this RATINGS } S I"" "' input current circuits: Frequency - 50 or 60 ilz Nominal rating Overload capability ( Instant-Continuous I s aneous DSE Relay I lA 10 A 100 A 180 A f 5A 20 A 250 A 500 A j BURDENS SLCE 12 ratio The DSE is available as a 1 A or 5 A relay. The respect-matching CT's 2.5 times 75 times norninal nominal 4 ive burdens at nominal rated current are: rating rating j 1 1 A relay,0.02 VA reconnectible rated current ratios: 5 A relay,0.18 VA 0.65 - 2.60/1 A I er h in the differential circuit, at 20 percent rated cut. 2.55 - 9.60/1 A n rent, the burdens are: 2.85 - 9.70/5 A f, 1 A relay,0.01 VA 5 A relay,0.02 VA The relay burden is not affected by the minimum Output contacts of type MS 1 relay: 1, f 'e sensitivity adjustment. 4A Continuous Auxiliary current transformers are type SLCE 12 with 20 A 'n Is an insertion loss of 1.0 to 2.8 VA depending on turns 100 A 10 ms ratio at nominal rating. See Appendix ! for speciOc Make and carry for 200 ms 30 A data.

62-10 AG DC auxiliary voltare: Nominal relay tap valdes are 43,60,110,125,220. 250 V de + 10 percent, - 20 percent t-15 percent for 48 Y version). MS 1 output tripping relay is availatile in any one of these soltares, as specified, 1 u Arnbient temperatures: .Q. . ': g -- , ~ Q. a j'~;,, p - 25"C to + $$'C (-13*F to + 131"FL except if ~.% '7 ~ i E auxiliary voltage is 220 or 250 V, top temperature i> _$3 - N ' 'e is reduced to + 40 C(104"F) is n,

• _._ s

~n - b.' ) $ Dielectric and i, urge withstand: \\ \\a*JIkuu_ insulations tests: TEE 4 module, (143), seat 4 s cunent circuits,2.5 kV,50 liz, I minute \\ xN all other circuits,2 kV,5011z, I rninute y $a_gg gg $f gg Dbg]D;o dp,5Io;a Impulse tests for all circuits: 5 CIp 01 Dp' 5 kV,1/50 u see.,0.5 joule D DP UD DP DP DP Surge withstand capability test: Do DC Do o DC D CIp Dj' D]o p D;'p D 2.5 kV,1 Milz, decay time,3-6 cycles, repeated DP DS D, 9.I n DQ ] M . _D[Q each 2.5 ms for 2 s.

• ; [Q P AD P C}P 2]DP

. f' C IP tbDP t ,0 t frM,nT R&""2

'L","O Iis. II, l!n sc6tratned instantaneous operating current wtiing adtust.

tnents t>y encans of jumpet poutmns at the reu or the 11.14 moduk C Auxiliary CT's type SLCE 12, taps available in 4 -6 percent steps, as shown in Appendix 1. From 0.65 A to 9.6 A primary to i secondary OPERATING SPECIFICATIONS From 2 85 A to 9.7 A primary to 5 A secondary (See Section on Settings on page 22 for Setting Pro-cedure Details) Operating currents Opnadng unie Minimum operatmg current: estraint udt Settings of 20,25,32,40 and 50 percent of the At 3 Hmn pickup cunenu 30 ms rated current of I A or 5 A At 10 times pickup current; 27 ms impulse time limit; > 15 ms Un restrained instantaneous unit operating cunent: Tap settings of 8,13 or 20 times the relay rating of Un restrained unit: 1 A or 5 A. See Figure 1I for method of making At 2 times pickup current; 10-18 ins settings. Impulse time limit; approx. 3 ms 17 I

+ +. e. ASEA ye -- [ 'a i L_J !- M.,,,,,,,,, .m as - g g f. {72[4 } } ! 7 5" j

: M-r-..-

....a.. .... i..., w.. o.., yi j f l l Owa t e +,, g 4e fg l =.a.ev e's o. i[ l M ~~ g s

1. fI l

~ l 3

v. 7.

. s,a i..o.... w s, g y_ w. ,,,, 9_ n. a an.., #,,*,. + w.,*i,* m#i,p. .e,e s e e s o o,.. U lig. O (at Through current restratrung characternth at larger current g t>,n eat,ei w eni 4a mon p:n e# m e, cat,ag t.reni yabu Minimum pedup netting of 20 and 50 pestent of rated cutterat. e The through festtaint tutrent l, = 'he aserage or the maurnum current i fig.12. Operating tine wunent charactetutics for DSI. relay. lg entenng the protected tone and the mestmum current 1 l 3 esung the sone See page 21 for pomts "I" and "1." k Restraints j* Percentage: Vari 6le from 35 percent to 70 per- , s., u. g j"" dip cent, cimending on magnitude of through cumnt and on minimum f* 7 sensitivity setti.'tt, nonsettable. Figure { ween differential et.crent and restraint } ~ 9[ 13 (a) and (b) shev the relation bet-3 current for relay operation. Figure 8 25 13 (c) shows this data presented as [ F percent operating differential current i vs through restraint current i.e. the i a s a 5 a percent slope characteristic. (See next section, TilERY OF OPERATION, page 19 for rnethod of describing rig. O m m low cuneni ngion of Nun n (at restraint current). 2nd hannonic: 20 percent 2nd annonic content in h the differential current will prevent gr,a operation. . 5th harmonic: 35 percent Sth hannonic conteni in oo-the differential current will prevent I operation. I g Notes: (1) The 3rd harmonic contributes no har. I w.m..,,,,, rnonic restraint action. The 3rd har-Im i -"7.,. ~, a s.,,,, monic current will contribute a small } h[f, p restraint due to the harmonic filter i /'> characteristic. Ilowever, this is offset '" (/ I by an operating voltage deseloped in f j the differential operate circuit by the ar I 3rd hannonic. i c j 4,. b *h I \\l 3 (2) Frequencies above the 5th harmonic .. O 6 g y 3

g g

t are filtered out of the operating circuit ..... %...., s. ,, a m, I and have little effect on relay perfonn-ance. 1; Iig.13 (ct Percentage restraint characteristic. i 1

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J.Y e R1 1 ,g g#~ ~ Horrriunc 3p b IO SD '[ D lidastrotrtt y; RY7443 us, e-yt - 2C ' 7g y g Harmcwc ~ y ROSE 43 .'} e--C l A C3 Cn { 'd b', db J I'l g, ,Lo J J J m.J m m m m ~1 ~ <g ~ ~ M JI" i I 3'toge 141 741 3 41 M fo i s u RO o SQ o TQ ORp u RQ o R@ ON ut 2n 4 31 1 31 2 31 ni ul --Additbnal Three Phase -- --Input Percentage --Harmonic -----Differen input -restraint units Restraint function Restraint Operatin (One phase only shown) Voltage 1 I ( -RXTUC 4 -- = = I -RXDSE 43 i g. i4. F uns(kmalitiaticra within Dil: including suppletrientalinput-restidnt unit TUC 4. - - - - - - - - - - - - - - - ~ - - - - ~~

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gr 6 m t ,,,, mm,, gw..g1 .y 62-10 AG filEORY OF DSE OPER ATION ones, are isolated from the common restraint output There are ten interrelated functions within the DSE resist n by virtue of their own rectiner diodes. 'Ihut, as shown in Figure 14. Wd ti nalinput restraints via iUC 4 input unit can be added without practicallimit, with miaimum cifect on the relay characteristic.

l. Input circuitry Mathematically,if Ix is the maximum ICT secondaryl Air gapped isolating transformers are used to convert current into, and ly the m.mmum current out of the each restraint curTent to a soltage. The de component protected transformer;in Figure 14, the restramt is thus also largely suppressed in the case of asyminet.

voltage, as developed by this circuit is. rical fault currers. These are untapped Oxed ratio trans-formers in order to get the desired accuracy over the V = k (lx + l ) I y entire range ofinput currents. These individual phase voltages are then each rectined where k is the proportionahty between voltage and with two power diodes, DJ through D6. Figure 14 cuttent of the entire circuit. For internal faults ly will shows the arrangement for one phase only, This input usually be zero (i.e. no current Dowing out of the circuitry is identical in the TUC 4 three phase supple-faulty power transfonner). The actual restraint volt-mentalinput restraint unit and in the main DSE relay, age is V. This is made non 'inear with respect to VI S except for the manner of packar.ing the three phases by means of zener diodes D7 and Dg and resistors R3, as shown in Figure 14. R4 and R$. Thus more restraint voltage is developed I

2. Percentage restraint circuitry The rectined restraint voltages of each phase are

3. Differential circuitry applied in parallel to a center tapped resistor, R, R2 The differential cunent is denved in the conventional 1

as shown in Figure 14. When such de voltages which manner by summing all of the currents awociated with have been derived from air-gapped isolating trans-each phase. Thi; cunent is then used to develop the fonners are connected in parallel, the resulting volt-hannonic testraint as well as the operating soltages. age is equal to the largest applied voltage, and the les-Again air-gapped transformers are used to suppreu n ( ) ser voltages have little effect on the resultant. the de component in the operating voltage. In addition, the use of R and R as two arms of the i 2 rectifier bridge provides a further valuable characteris-11ey are also used in the harmonic restraint circuitry tie, in the conventional four diode bridge, the output and low pass Alter to additionally provide the induc. has no sense ofinput polarity. But with a bridge com-tive branch of these L-C filters. posed of two diodes and two resistors, the uc output The total differential cunent is used to develop the voltage becomes sensitive to the relative polarity of differential voltage V4. Ilowever, the high frequency the applied ac voltages. If two applied ac voltages are components aic suppressed in the low pau filter T, I of the same polarity (as during an internal fault), only R7 and C, before rectification in a conventional four ( the larger one will cause a current Dow through R on diode bridge. This Otter prevents relay operation from l 1 one half cycle and through R on the other half cycle, frequencies above 500 tiz. 2 But if two applied ac voltages are of opposite polarity (as during an external fault), one voltage will cause

4. Ilarmonic restraints current to flow through R] and R on alternate half 2

cycles, as desenbed, and at the same time the other The 2nd and 5th harmonics are segregated by means of T' - C2 and T5 - C5 respectively. These two har-voltage will cause cunents to now through R and Rj monic voltages are totalled (V') before rectifying in a 2 on the same half cycles. Thus the sum of the tw applied voltages results when they are of opposite four diode bridge. The rectined harmonics from all polarity, but only the maximum of the two results three phases are brought together via terminals 222 and the resultant, V, used for restraint on each of 3 when they are of the same polarity, the three phases. The net effect of this method of har-Thus, this two-diode two-resistor-type bridge, plus monic summation for restraint is to provide an im-air gapped current transformers results in a desirable proved restraint with minimum reduction in speed or type of restraint action. During an internal fault all sensitivity to internal faults. of the lesser of the various input currents cause no g3 restraint action. But on an external hult the restraint is mereased to the sum of the largest of the input cur-5 Phase threshold circuitry. (Pulse width comerter) rents and the largest of the outgoing currents. The rectined operating and restraint voltages are sum-med up in a resistor type summation circuit R6, R9. I Another desirable feature of this circuit is that all cut-R I1 and R 2 as shown in Figure 14 as V. There is a 1 6 i rents sources other than these respective maximum substantial ac component in this surnmation because to

q' o As 4 usc.;.A.A.f ?"w s b *T M AOEA Rx0SE 43 Phsu un.t (pe of theel Rx1EE 4, ueatwegg are eviput et_ bem scau _ {e l Bgiers A ',a v6 __ c -L LE o,,, i} Ini g. Le v el '"Y { cetector grator l telec tor g g g, eo- !Vd -E_E d" "' "'S' i l Level t __ Jtite'2t .1' 4 open i v*0 Ybs0 a T o Vf, Vref Yo l 3 I Vr open g ge Vb M' ' ~ ~ 1 a i i T e e to i to to to/ fc 041 W V ,.. et a l /\\y Yb tiesed l -l qlf-f- < I l 1 ih i i i T 8 o s_.- 1 I l a o la 7 to to tc/ T >0 41 to>34ms l lig.13. Wave thtpet and puhe udth integrating action required to deselop trip signals. E of very little filtering. This complex wave form is then

7. Un-restrained trip circuitry compared to a de refererice develvped by R 13.R 4 Any signal above the reference is converted in the ope.This is also an instantaneous function, with a signal as 1

rational amplifier circuit to a variable pulse width short as 3 ms capable of causing a trip output condi-signal which is then integrated in C4 and R tion. This signal V4. is derived from the differential l 7, current. It is taken from the rectified output of the

6. Measurement circuitry differential voltage circuit through diode D IO prior to mixing with any of the restraint voltages. It is free of The inPW outpq tvhes from each of the three, any de component of the ac current due to asynmetry phw 1 b..h id-intipators are fed to a common because of air gapped input transformer T1.

mus?g ; .t. When the width of the pulse to any A separate measuring circuit in the three-phase mea-phL W did integrator circuits exceeds 3.4 rns .3 ms period), the biases on the transistor suring unit determmes if this signal is above the set (ot.1 ot u 2 output atuplifier are shifted to provide the desired value of 8,13 or 20 times the relay rating. The desired trip output. At this threshold value several pulses will setting is made by means of a COMillFLEX wire jum-be required to bias the amplifier into a trip condition. per between terminals 417 and 427, as shown in Figure 11. Figure 14 illustrates the method by which this mea-surement is made Fhire 15 shows the wave shapes

8. Minimum sensitivity circuitry (L

and the actie 'I A trious components in these circuits which 4. c. if a trip condition exists, Within the three-phase measuring unit is a set of tap-ped resistors wired to a selector switch for the 20. 25. 20

.t a .wbt 62-10 AG 32,40 or 50 percent minimum pickup current setting. O These resistors plus Rl3 and R a set the Nas on the This same set of characteristics is applicable for in-i ternal faults. Norrntity all cunents would now into operational hmplifiers in the DSE 43 units. This sets Y the calibration of the individual phase threshold-such a fault. The correct value of restraint to use aith these curves then becomes one-half of whicheser cut-integrators to the value marked on the selector switch. tent is the maximum infeed,

9. Output circuitry Note:It is apparent that the plotted slope of a dif fe-The output ampliner drives a 1 ms dry reed relay.

rential relay is a function of the method of present-The reed rela" energizes a 3 ms six contact. MS 1 mg the restraint data as well as the actual operating output relay. - ach contact is capable of tripping a charactenstic of the relay. breaker. Wiring functions are shown m, Figure 14' As shown in Figure 13 (c) the minimum pickup semi- .The MS 1 relay contacts are all N.O. On special order tivity, settable at 20,25,32,40 and 50 percent of re-doable throw contacts can be provided. The MS I re-lay rating, has small elfeet on the percentage restraint lay can be energized continuously. Thus the circuitry at high current levels. The percentage restraint or slope can seal in this relay so as to provide a self-contained shown in Figure 13 (c) will always exceed 35 percent lock out function. of aurned restraint, regardien of sensitivity setting. It will exceed 50 percent above 31/2 to 6 times relay

10. Ancillary functions

a. Target The DSE fundamental frequency charactenstic is One contact on the MS I output inning relay further illustrated in Figure 13 (a) by points E and 1

( energites the coil 0 of an operation indcator, T. Point E is the plot of a heavy esternal fault as might This is a mechanical and electrical reset device. It occur in a nng bus or breaker and a half scheme witfi has no restrictions on the source of voltage for the a through fault current of 30 times CT ratings and a reset function, R. As shown in h,gure 14. a drop-ratio error in one set of CT's of 35 percent. With such ping resistor is included to allow resettm, g with any wvere distortion, of coun,e the hannonic content voltage from 48 to 250 'l de. of the secondary currents must also be considered.

b. Phase indication Point Iis a smallinternal fault of four tunes trans-h When specined, type SG 1 individual phase indi-fonner rating supplied from only one source.

cator unit is provided. This is a one seat device and linvy load currents will have very little effect on the A locates in the available seat 355 in Oye basic sensitivity of the DSE even to minor fault currents. COMBIFLEX DSb assembly. Electncally the These two cunents, load and fault, will nonnally by targets are electronically controlled LED,slocated nearly 90o out of phase to each other in at least one in the output of each phase threshold circuit as phase. The phase threshold measurement is made sub-shown m Figure 14. The targets are reset by a front stantially on an instantaneous basis, since there is mounted push button on SG 1. little 61tering in the several rectined signal circuits. (

e. The rnethod of rener diode regulation of auxiliary Thus the fault cunent measurement is made dunng voltages to correct value regardless of value of the periods of the cycle when the load currents are at a minimum.

supply voltage between 48 and 250 V is also shown The 2nd and 5th armonic restraint voltages for each h m hgure 14. phase are paralleled and the resultant ust d f or har-monic restraint for each phase. This resultant will be proportional to the sum of the hannonic currents. These restraints are linear wid; harmonic c PERFORMANCE CllARACTERISTICS respect to the opera-tin;: current magnitude. A :nt The variable percentage restraint characteristics of the DSE is shown in Figures 13 (a) and t b). The abscissa the differential operating circuit of any phase w di is the average of the maximum cunent entering the block the operation of the relay ifit exceeds 20 protected zone and the maximum current leaving the percent of the value of the fundamental ditferential zone. These are the two currents which develop the current in any phase. Tests and analysis show that restraint within the relay. The average value of the magnetiring inmsh cunents which are greater than the minimum pickup current of the DSE will contain current rather than the sum is used to provide a quan-more than 20 percent 2nd harmonic m at least one tity whose value is comparable to the How through

phase, current during an external fault.

The ordinate of Figure 13 (a) and (b)is the usual A Sth hannonic current in the differential operating operating current flowing in the differential circuit. circuit of any phase greater than 35 percent of the

3damental differential cunent in any phase wdl The percentage slope plotted in Figure 13 (c),is the also block relay operation. Tests and analysis show ratio of the ordinate to abscissa of Figure 13 (a),

that transfonner exciting currents due to high volt-n

i = $bh ADEA age which are Freater than the minimum pickup cut-Ita:monic restraints rent of the DSh will ec.ntam suf fielent 5th harmonie eurrent to block relay oreration. Ilowever, very large

• * * # N **
• W

1. b t

mr the # Sannonn maaint cuuent oserexcitation cunents can quickly cause transfonner aamage. Overvoltages of at out 1.5 per unit will result in exciting cunents approaching to the fullload rating g, 3 of the transfonner. At these very high exciting curr-The setting for mimmum current sensitmty t20,25, ents, the percentage of 5th hannonie drops below the 42,40 or 50 percent of relay rating) should be selected 35 percent restramt value of the DSE. Thus if the based on estimated CT perfonnance dunng small cut-ovenoltage is sulikient to seriously jeopardire the t rent conditions. As shown in Figure l3 (el this setting transformer in a very short time, the DSE will operate is not a slope settmg. It has minimal clicet on the re-to protect the transfonner. Every transfonner design lay performance at high currents, it also has minimal will result in some differences in overvoltage excitation ef fect on the percentage restraint action of the 2nd j charactenstics. But the basic mathematies of over-and 5th harmonics. Thus a sensitive settmg will not e, citation cunents shows that the 5th harmonic is harard trip-outs due to magnetizing inmsh. larger than the amount required to block the DSE up to exciting currents about 70 0 of transionner full The 20 percent sensitisity is suitable for CT turns load ratmg. And above this current, the percentage ratio mismatch errors up to about 5 percent. When 5th hannome becomes less and the relay will operate tap shanging under load transfonners are being pro-to prevent transfonner damage. l{owever, it is im-tected, a minimum cunent senutivity of about 15 portant that the DSE chaneteristic has been designed percentage points greater than the worst turns ratio to prevent tripout on overexcitation and it should not mismatch at the tap changer e Atteme should nor-be the sole protection if estremely large, damaginc mMiy be selected ~ These sensitivity guide lines are based on nonnal trans-excitation currents are possible. former load of 5 A in the 5 A relay. With bleaker and The operating time of the variable percentage, har-a half, nng bus, or other similar schemes, high ratm l monic restraint relay is instantaneous as shown in CT's must generally be used because of possible i Figure 12. The operating time of the un restrained in-through current flow which does not enter the trans. stantaneous unit is also shown in Figure 12. All cha-former. This will result in a reduction in transtonner j racteristics are based on the ac component of the differential relay sensitivity in tenus of the trans-applied currents, since the DSE has air gapped trans-fonner rating. Ilowever, auxiliary CT ratios can be formers which suppress the de component, used which will utdite the continuous overcurrent The basic relay is a three-phase, three input restraint rating of the DSE up to 200 9 so as to minmuze thn relay. The described performance is also applicable effect. The CT ratia selection procedure is given above when the relay is used only with two three-phase in, in the secti n n CT Calculations. puts. Similarly, additional inputs in conjunction with Where accurate knowledge is available on the limita-TUC 4 three phase input modules will result in the tions of the CT charactenstics. an increase in the sen-g same described relay performance. sitivity of the DSE may be possible. Application of All calibrations of the relay are accurate to 10 percent. the DSE with currents ra to twice the relay rating is The operating current of any relay will be within 10 acceptable and results in a sensitivity,in tenus of the percent of the values shown on the variable restraint actual circuit rating, of twice the markings on the relay. characteristic of Figure 13. The performance is as stated up to 100 times relay rating of 5 A, or option-Instantaneous Setting ally 1110 times the 1 A relay rating. The un-restrained, instantaneous relay setting is not functionally related to any other setting of the relay. Nor need its setting determination be based on the The relay @is shipped with this umt set at 20 times pe ng o e reurained unq m on G dancteh SETTING DETERMINATIONS The 5 A nominal rated relay should normally be se-relay rating. It can be reset to 8 or 13 times rating by j lected for use with 5 A rated CT secondaries. The means of shifting leads on the relay terminals as overall CT ratios are then selected to provide about shown in Figure iI and 14. This unit is not responsive 5 A to the relay at normalloads as described under to the de component in an asymmetrical current. It is CT calculations. The relay (and SLCE 12's auxiliary responsive to approximately the peak value of the ae CT's when used)is then capable of carrying any comp nent of the applied differential current and is j emergency loading up to the 12.5 A coniinuous calibrated in rms current for an equivalent sine wave. secondary rating of the SLCE 12's (or the 20 A of At high currents it will restond to a current pulse of the DSE). l only 3 ms,(as from a saturating CT). But it is un-u

7 -- --- ;;-_T-~ Z L ] [ il.. % m an g ig d 62-10 AG affected by transient spikes ofless than this time dura-tion. TESTING Acceptance TM \\' This function of the relay should be set above any antleipated inrush currents. The following table of Check the name plate to assure that the relay model suggested settings is based on experience with typical numbers, ratings and cahbration ranges are as speu-transformers fled in the requisitions. \\ isually inspect the relay to TABLE 1 assure that there has been no mechanical damage in shipment or storage. Confirm that the de soltage tap Typical un-restrained relay settings based on fullload corresponds to the available soltage. current equal to nominal relay rating. .Ihe seseral operating charactenstics for the three-winding relay can be Individually checked with the Tranitormer Trandormer when energued from. Connection sire si t ude L v.ude conventional test circuit of Figure lo by selecting the proper connections from Table 2 for each characte-YY Less than 10 MVA 20 X 20 X nstic of interest. YY More than 10 MVA 13 X 13 X When more than three inputs are required, additional Y Delta (L.V.) any 8X 13 X restraint units.TUC 4, and a second test switch RTXP When additional TUC 4 input restraint units are used 18 are added to the relay as shown in Figures 3. 7 (d), there is no change in the settirig procedures. (el and (O. Note that in Figure 7 te) the tnp wiring f is routed through two test switches so that msenng DC Voltage Taps the test plug in either opens all of the inp functions n the relay. The five and six input relays shown in" Taps for the de voltage should conform to the avail. Figure 7 (f) utilize three test switches for testing con-able voltage, per Figure 14. The MS 1 output trippin; venience. The testing schedules for these models are relay should have the proper coil for the available shown in table 3,4 and 5. voltage. The voltage taps and zener regulators of the TEE 4 are only for the electronic components. lhe electrical connections to the relay should be made through the test handle properly mserted in (j \\ iis.16. Test set up ror checkang Ds0 RADSf operating charactenitics feuert 3 th RTXH t8 harmonic restraint). + j 2 (M>~b 2 - Kr1 14 3 o m a a -[] Mi/ ] Q/ ~ 4 4(4) Y_ ~ T 54 III _.. ~ )C> i# h[g L n s.ne - ( 10>l25V ,Oey 7 ,gja J r roted cod b 7Q M l ]9 f requency L. ,9 y2 6 3 84,, y; e ( tv3 ots t. 134 8 ~ ,,jv% ortion ) p 5 9d RL. [, L._._- .rvvv .10J 51 9 j 16 4 2 2 11ce '3 p H Y " " 'T '"' n .12&- 2 - 0 0 Ib IO II 5 13cd SId UI +C g ild '""7 11 m -c,,.s-s L u.e \\

• 0

~ i Q .W 6 l g --] t/ Out>-- wp i se w DC. p) Supply l ~~ ~ ~ ~ 4 ~~TrwI~tErit7o~r7c5oM5e~m'~oIe~cEt Ne'~Ifle5[ ~ Note 1: Refer to Figure 7 (el tot internal connections w hen rous input $ are used, and to Iigure 7 (O w hen rive or six mputs are used. OR odput relay Note 2: Connect test leads A. B and C to the RTXH IB test handle TR Output tr$p ng retcy accordmg to the schedules in Tames 2. 3,4 or 5, 1 Opvoton indicator 0 Opecting cod R' Resetting cod

.m. m.

• " sa l _

_ m.,, m 9 AC3 E A the test switch. This will check the complete relay TABLE 4 system including the output tripping relay. The de-tails of these testing facihties are shown in Figure 8. To be used with Figure 16 and Figures 7 (d) and (f) Test of DSE with the input restraints (two TUC 4's and two or three test switches) Connect Connes t Connu t lead 4 to Test of Phec tummal le,id B to lead C to Set siitA 5 termmal termmal in roution 3 perstmg k 346,9.3L,6Li 12 0 vdue S 4tt,10.4L.7LI To be used with Figure 16 and Figure 7 (a) 13 0 T 5 a ll.5L,sLi 14 0 Test of basic DSE with three input restraints 2nd R 3(6,9,3L.6Li i2 i Connect Connect Connect harmonic S 4 (7.10,4L, 7L ) 13 i Irad A to lead B to lead C to Set switch 5 restraint 1 5 (N. ll, $ L,6Li 14 1 Test of Phne terminal terminal termmal tri position ~ p Operating R 346,9) 12 0 fault 9 3L 12 2 salue S 4(7,10. 13 0 rmha nt 6L 3 12 T $(8,11) 14 0 3 4 7 I3 2 10 4L 13 2 2nd R 316.9) 12 1 Il 4 33 2 harmunic 5 4 (7,101 13 1 1 5 8 14 2 'h erstramt T $t8,11) 14 1 II 3L I4 2 NL 5 14 2 Throur.h. R 3 6 12 2 fauh 3 9 L2 2 Note it Connections show n to ictminah within ( ) are optiona, for a more restraint S 4 7 13 2 complete test I the reiar input circuits. 4 10 13 2 Note 2: L stands for terminals on the wcond test switch (50li m the T 3 8 14 2 lower icit of the 85 equipment frame, 5 11 14 2 Note: Connectior.s show n to terminals mithin ( ) are optbaal far a more-TABLE 5 I complete tesi of the rela > mput circuiti. To be used with Figure 16 and h,.yures 7 (d) and 10 Test of DSE with six input restraints (three TUC 4's and two or three test switches) TABLE 3 Conn'" Connut Connu t lead A to leaJ B to lead C to $ct switsh S To be used with Figure 16 and Figures 7 (d) and (e) Teit of Phaw termmd termma termind in counon Test of DSE with four input restraints (one TUC 4 operstmg R 3i6,9,3L,6L,9L) - 12 o - and two test switches) sdue S 4 (7,10,4 L. 7 L. 13 0 10L) Connect Connect Connect T 5(8,11,SL,BL, 14 0 lead A to lead D to lead C to Set suitch S Test of I hase termmal Ill) terminal termmal in position 2nd R 3 (6,9. 3L,6L 9Li - 12 i Operstirig R 3 (6, 9, 3 L) 12 0 ulue S 4 (7,10,4 L) 13 0 harrnonic 4 ( 7.10, 4 L, 7L, 13 1 T $(8,II 3Ll restraint 14 0 IOL) T 5 (8, l l. 5 L,8L, 14 1 2nd R Jt6,9,3LI 12 1 humome S 4 (7,10, 4 L) 13 1 Through-R 3 6 12 2 restramt T 3 (8 II, SL) 14 1 faun 9 3L 12 2 Thous-R 3 6 12 2 restramt 6L 9L 12 2 fault - 9 3L 12 2 3 4 7 13 restraint S 4 7 13 2 10 4L 13 2 10 4L 13 2 7L gog g3 3 T 6 14 2 T 8 14 2 11 $L 14 2 il 3t 14 8L lit 14 2 Note i t Connections shown to terminals within ( ) are sptional for a more i complete test of the relay input ctreuits. Note 1: Connections show n to ter.ninals within ( ) are optional f or a rn e complete test of the rela) input circuits. Note 2: L stands for termmals on the second test switch (501)in the lower Note 2: L stands for terminals on the second test switch (501)in the lef t of the BS equsprnent frame. lower left of the 8S equipment frame. ]-

f, t. rW9 Ws: -MM.17 - ^""%= e ""*"h- 'W"- L ? ' 2'C# i 62-10 AG Fundamental Frequency Tests ner provides a current waic shape neh in :nd har-m nics in additiarrto the de component. Ily adjust-9

a. Minimum pickup currents With the selector switch in the inid t0) position ing the two load boxes, various proporbons of 2nd tFigure 16), the minimum pickup currents and the hann nic to fundamental can be estat,bhed, un-restrained operating currents can be determined.

Sect 2 seatt The value should be within 10 percent of the settmgs. '-- s To eliminate any ambiguity as to which unit is ope- -,O bC h k, b,,0 3 c rating, the restrained unit can be iemporarily dis-54 3 n abled by opening the connecuon to tenninal 222 - - p 1 q,0 qp A pp 143:423 of the TEE 4 measunne urnt. See Figure 17 foi the physicallocation of this tenninal. The ,Q Op pp O D,0 DO extractor type RTXD provided for this purpose should always be used. Never attempt to remove a lead without the extractor. Note: The output rel.y will normally rulsate when h 4 the un restrained circuit is tested. Ilowever, the time Dh E Q,C ,,C A Q i in the Grst picked-up position is long enough to trip a breaker when the relay is in service. O g

b. Restraint characteristics

',6-Q6 - Q6' With the selector switch (Figure 16)in position 2 g ~o o D the restraint charactenstics can be detennined.1he I'3 3 ~ ~ r operating values should be within 10 percent of the 42 3-curves of Figure 13 (a) or (b). For convinience to these values, with their accuracy limits, at an am- 'U bient temperature of 20-25"C, are tabulated in N table 6. 'g# t N-m Observe that the un-restrained unit has to be con-nected for an operating value higher than the high- ,Q $ p,Q h ,Q 1(O est value of1,in table 6. 1 g 343 This means that terminal 143:417 must not be connected to 143:427 af. at the setting 8 times rated

Current, rw n tat Ttt 4 m31 rneanunns unit. rear ue= showms toution or terminals used or opened during certam tests.

TABLE 6 h Variable Restraint Test Data at 32 % Min. Op. Current 13(A) Ig(A) Relay rated current Restramt Differential p51 1A 0 0.29-0.35 RTXP DSE 43 OSEL3 OSEL3 1EE 4 1.5 0.66-0.94 is 355 3 1.6-2.2 Sm 10 7.8-10.4 5A 0 1.45-1.75 N "' "'" 7.5 3.3 -4.7 15 8.0-11 50 39-52 is5 i43 33i ns im W Caution: This u a harmonic restramt relay and it is cuential that sood Sme uave test current be used for Mi rundamental tiequency teittng re-y$j quirements, 3gg TEE 4 05E &3 OSE 43 DSE43 RixP 16 Ilarmonic Restraint Tests 501 The 2nd harmonic restraint characteristic can be Rear view checked with the circuit of Figure 16 by placing the helector 5% itch to position 1. The single diode tecti-lis. t 7 (di. pst, location and identirwation or moduiet 25

. _--_ - e .g y -- - %,, 7w:e,. % b e.,,, M r

• T,%l..

m.m.,wefe ~# i- - -M. ~ .i ASEA Wave shape analysis shows that if the ac current i 1 To check the inter actics between S and R phase units is read on an ac atometer and the de current 12 is read proceed as follows: on a de ammeter of moving coil type (neither of rectiner type ) the following expression will be valid:

1. Rr>..ne the test lead from ammeter 1 to C, at C.

h 2

2. Connect this ammeter lead from 12 to tenninal 13, percent 2nd hannonic a 0.47l' (S 0) x 100

3. Connect ajumper from tenninal 4 to 3. tS O to R 0)

De 2nd harmonic restraint has a 20 percent nominal value. A convenient check point is to adjust the de

4. Connect te.st lead A to terminal 3. t R 0)

5. Connect test lead C to terminal 12,i R 0) current to 4 A and with the minimum pick up setting

6. Place switch S in routmn 1.

at 32 percent, gradually increate the ac current until the relay operates. For the 18-25 percent factory

7. Adjust the d.c. eurrent 12 to 2 A (for a SA relay) and with the minimum pick up setting at 32 percent, calibration this should be at 3.1-6 A ac. The mini.

gradually increase the a.c current 1 1 tmtil the relay ruum pickup sensitivity setting has little effect on this operates. The fundamental current needed for 2nd hannonic restrains characteristic. operation will at this interphase test be proportion-The de component of the 2nd harmonic test current ally higher than at the nonnal 2nd harmonic re-will not only flow in the relay (and cause no gnifi-straint test. as in this case,it dces not now any 2nd harmonic component in the operating circuit. cant effect because of the air gapped transformers), but it will also now in the supply circuit. This may The percentage 2nd harmonic is in this case equal to cause de saturation in the supply transfonner and re. sult in fuse blowing More importantly it may result 0.471; x 100 0 in test voltage distortion which may affect the relay 1) characteristics without the tester being aware ofit and will at this test normally be 2-6 percentage other than by observing a relay with apparent lack of points lower than at the 2nd armoruc restraint h sensitivity. Should such be the case, one solution is t test. Thus the $ A relay will operate for approt supply the rectifier circuit from a separate ac source. 5-6 A Another solution is to add a 2nd rectifier and dummy g, ggy,,'est lead from 13 ta 14 and jumper from 4 to load to cancel the testing de in the power source. This 5 to check inter-action between TO and RO. To is also shown in the test circuit of Figure 16. check the inter-action between To and So move ) De 5th armonic restraint action cannot be conven-the test lead A from tenninal 3 iRO) to 4150) and h iently checked in the field. In the test lab, the use of lead C from 12 (RO) to 13 (50). a power oscillator adjusted to the 5th armonic fre-Note: This inter phase harmonic relation does not in-h quency is the most precise method of checking this volve the fundamental frequency restraints hence a characteristic. The relay will at three-phase be restrain-total of three tests will completely check this feature ed with 5th harmonic of 35 percent or more of the regardless of the number of restraints. fundamental. I Indicator Tests Calibration Check that the indicator Dag in the TEE 4 unit drons if any of the restraint characteristics appear to be off when the relay operates and that the indicator flag calibration, internal relay adjustments are not recom-resets when i10-220 V de is connected to terminals mended. 416 (+) and 411 (-)in the TEE 4 unit. Ilowever, before judging that a relay is off calibration hiec phase Tests confirm that the test current is a good sine wave. A The complexity of three-phase testing is not usually small amount of 2nd or 5th armonic in the test cut-h rent can have a signifkant effect on the relay operat-warranted. If a three phase, fundamental frequency ing characteristics, test is made with a pure sine wave, the minimum pick-up current will be increased frorn the calibration value Functional in Service Check Out by a factor of 1.4 to 2.0. This is inherent in the relay design and is not adjustable. Ratio checking of the current transfonners and auxili-ary transformers is conventional, as are the other func. Inter phase Tests tional tests such as circuit breaker tripping and lock-To check for the inter phase action of the harmonic outs. In service load checks are most conveniently I restraint it will be necessary to inject the 2nd hamio-made with an ammeter and current test plug inserted nic into one phase unit and the operating fundamental in the respective current circuits at the RTXP 18 test frequency into another. switch. The location of the various currents on the test switch is shown in Figure 7. Good testing practice n,

.,.- u, -.. u. w. -..amn a[

r... m.

m ~._,,.y-62-10 AG would include inserting the red nip blocking plug be-unit. The uwrestrained unit operation can be con-fore taking any current readings. Note that with multi-formed by timing this unit about 150 percent ofits O restraint models which require two test switches, the pickup value. This time should be about 10-12 ms (_,./ residual phase currents have two contacts in parallel, less than the restramt unit time when checked at a see f'igure 7 (d). Thus to measure the residual c'irrents value just under the un restrained pickup current. it is recommended to use two test plugs, one for each it is not recommended to routinely disconnect the test switch. Connect the current test plugs in parallel wires on the TEE 4 unit to establis'.: the complete in-i to an ammeter. Insert the test plugs to the same posi-dividual performance of these two units. tion (12,13 or 14) on the test switches. The ammeter then shows the total residuai eurrent. If, en the other hand, only onte test plug is available the residual cut-Caution: The relay eatibrations can only be checked rent can be measured by insering the current test plug accurately with pure sine wave currents because of the in one test switch and ternporarily open the inter-hannonic restraint nature of the relay characteristic. connection between the terminals 14, on the A side of the switches. jS are Parts There is normally no need for stocking spare parts but --Routine Testing this procedure also assures that a replaced relay is up to the origmal factory quality and calibration standards. Ur der normal conditions type DSE needs no special testing or maintenance. The covers of the plug-in F modules should be fitted properly. Contacts in the RECEIVING,liANDLING AND STORAGE output tripping relay or in the test switch which are burnt due to abuse should be carefully dressed with a rhese relays are shipped in cartons designed to prcs diamond file or a very One Ole. Emery cloth or similar tect them from damage when not included as part of a cubicle or control panel. Upon receipt the relay abrasive materials are unsuitable for dressing relay con-should be inspected for physical damage. tacts, as insulating grains from the abrasive material may be deposited on the contact surfaces, thereby It is recommended that the relay be replaced in its causing mal-function and failures. shipping carton after inspection for deliveiy to jobsite. Also the relay should preferably be left in its shipping Routine electrical tests can conform in frequency to e rton until time for actual installation. the users' established practice. Checking the pickup The relay is not critical as to humidity.13ut general setting of the relay and timing it at a moderate mul-prudence suggests that it be stored in a dry, moderate tiple of pickup is usua'.y adequate for the restrained temperature enynnment. DIMENSIONS h + s *, ~,.,,.,. ~m o.- ,e %.,, .,, e om.m v.. a. i . m u . ~..., m g g stam ws1 I ~ ~ CD ' Tl 2re; 5 w m, _ f-pr w ,._ R b ~ e s wa y mer m n.' es4.Ub- - - Pl ![~- a ~L 'sL JL % J g.Je 5".- , i m y., -.- *swe e> d Wup.$.

1. S

~ ~ g ti,, ,,f, ,s, _ so.... l - -.4 6 M"- _[ -.o mu y-- I [r* 'l l ~~n: ,sai ~ 1) r+r" w et M /N 3 i I b L uwm Q j 6 p y.; j ma y i -[1 ,__f, . seam - -.-aSt= g ij -] ec;L ..,u,. D'#as s'aa - *8M m. L j w e ---u --w,an ~ wm wa,. Th.18. Phyucal dimensions of DSE, panel drdling and cut.out. 4.... ,e om. 27

g, &,, . w.,. m, u ;. n.. w ,4 . + _ ~ z. ADEA APPENDIX 1 MULTI TAPPED SINGLE PilAl AUXILIARY O CURRENT TRANSFORMERS TYPE SLCE 12 These tables are also suitable for wye delta connected transfomiers. These are reconnectible auxiliary current transfonners intended fer use with 1 A or 5 A transformer differen-For example if the incorning line current I = 1.31 A p tirJ protection type RADSE. Three different trans-and it is desired to have delta secondaries yield is = formers are available to provide current ratios from 1 A line current: 0.65-2.60/1 A,2.55-9 60/1 A and 2.85-9.7/5 A. X l.31 Sufficient taps are provided for setting the secondary Ems X. =, J, current with an accuracy of13 percent of any de- {

• j 13 sired value.

llence from table I choose SLCE 12 current trans-Design fonr.er 4785 040-VP with a current ratio 2.26/1 A and turns ratio 70/162. The transfwrr.ers are equipped with three secondary windings connected to a terminal block with six ter. Load Durden minals marked I to 6, and with two prirnary windings with intermediate tap connected to another terminal The maximum pennissible resistance in the wires be-block with six terminals marked 7 to 12. The trans-tween the auxiliary current transformers and the dif-formers have also a third terminal block with their ferential relay depends on the relay burden and the h terminals marked PI - P2, SI - S2, to which the ex-rnaximu.m primary current for which good perfonn-ternal connections should always be made. ance is desired. For a given total secondary burden the Tables 1,2 and 3 on pages 30,31 and 32 show the maximum primary current I pmn for a 10 percent ratio most suitable internal connections (and turns ratio) error can be calculated accordmg to the following formula: to obtain a standard secondary current of 1 A or 5 A for the listed primary current if the transformer is 1pmn = n. In ordered with a certain ratio it will be delivered con. nected for this ratio. a r b+z T'. w ables can also be used to determine turns r:'n m,onnections when secondary currents less in = rated et.rrent of the auxiliary CT's t. 5 A are desired by directly proportiorung a = constant (ohms), given in table 1,2 and 3. "" " k This depends on the design of the CT and ,if I = 3.6 A and it is desired that Is = the frequency of the current.

r m ;

p b = resistance of the secondary winding ac-4. Y cording to table 1,2 and 3. th Ge 5 A transformer with the same current z = impedance of the burden (wires and the I ratio, i.e. differential relay). X - 3.6 gives X = 4.0 This formula is valid for symmetrical primary current. 5 4.5 Asymmetrical currents will saturate the core at a lower current Good CT application practice suggests that n, Hence from table 3 choose SLCE 12 current trans-the saturation factor, should correspond to the maxi-former 4785 040 VS with a current ratio 4.0/5 A, mum through-fault current, and turns ratio 53/42. 12 11 10 9 8 7 ~ ~ ~ ~ ' o o oo o o P1 - lp Pt P2 9 m S Is-- wmI mM' P2 N;, m ) k m 7 )2 m g h[ [ ~ ~ s1 52 g i 6 oc 6 5 54 32 1 Fig.1. Terminal markings for SLCE 12 auulary current transformer iig. 2. Wirmg diagram for three auxihary current transformers connected wyeye. 28

.m. c-a. wcm.,c 2 my f.d1' ' 'M '\\l__ ^ N 62-10 AG API'ENDIX 1 C ') Ratinp Rated secondary current I A or 5 A Bu. den According to tables 1-3 Rated current ratios Reconnectible in 4-6 per-(SCII nuunption) cent steps according i Tables 1-3 insulation test soltage 2500 V,50117 0.65-2 60 A/l A Maximum wire size to 2.55-9.60 All A terminal block No 7 AWG (10.54 mm') 2.85-9.70 A/S A g ;, j, y,',,'q,,3 7 ) Rated I.requency 60 117 Dimensions According to Figure 3 Overload capacity 2.5 x rated current continu-Weight 3.6 kg (8 lbs) ously 15 x rated current for 10 s 75 x rated current for i s r ,,10(2361460_f231, t f.,i n In n %g t a 27 6 o 6E SOM8 (1064 7 Y l ,. )p Y -, 1 1_ n o r p i._ / I5 39) 7 (Amy anpm.m,w J-[ h i_ 40 ~l (1 57) - 102 14 02) g_ t16 [5 151 _a I !25 (4 92) _ ( t i I*R Xffti gg 7 o K A_ g -gm-1022 027) [!2illf l0f 910ll! Nd l t t o e 102 82 f$2 I t'c2) o 2a iQ uus a m tu *w i O 5 g,,g_ e-O t = M*i it I Ji _L_j . g-v- Fig. 3 Dimennons in mm unch) for Auulury Current Transformer type SLCE 11 [ 29

. waw r ~ - - " ~.r..

• lJ

~ ~ ~ ~ - A,d" "~# T'*~ - AOEA TABLE 1: Connections for 1 A ratM 2condary O Transformer SLCE 12 for Ip = 0.65 - 2.60 A, i = 1 A s Ordering No. 4785 040-VP Terminals No. of turns Resniance O l-2 154 0.38 3-4 16 0.05 5-6 8 0.03 7-8 70 0.21 8-9 30 0.10 10-11 70 0.24 11-12 30 0.11 Primary current Connections on prirnary side A Turns tstio between terminals Connections on secondary side U Pow er consump. a b between termmals tion at I, = 1 A O O VA 0.650-0.670 200/130 0.671-0.710 200/138 S l - 1, 2-6, 4-5, 3 -S 2 56 0.47 1.0 0.7I I-0.750 200/146 S l - 1, 2 -4, 3 -S 2 60 0.44 1.0 S1-1,2-6,5-S2 63 0.42 1.0 0.751-0.790 200/I54 P1 -7, 9-10,12-P2 0.791-0.830 200/162 S1-I,2-S2 67 0.39 1.0 0.831-0.870 200/170 S I - 1, 2-5, 6 -S 2 70 0.42 1,1 0.871-0.900 200/178 S l - 1, 2-3, 4 -S 2 74 0.44 1.2 S 1 - 1, 2-3, 4-5, 6 -S 2 77 0.47 1.2 0.901-0,930 170/154 Sl-1,2-S2 67 0.39 1.2 0.931-0.980 170/162 0.981-1.02 170/170 PI-7' 9-10, l l-P', S I -1, 2-5, 6 -S 2 70 0.42 1.2 S l - 1, 2-3, 4 -S 2 74 0.44 1.4 1.03 -1.07 170/178 S l - 1, 2-3, 4 -5, 6 -S2 77 0.47 1.4 1.08-1.12 140/154 SI-1,2-S2 67 0,39 1.4 1.13-1.18 140/162 1.19 -1.24 140/170 P1 -7, 8-10' 11 -P, Sl-1, -5, 6 -S2 70 0.42 1.4 ~ 1.25-1.28 140/178 S l - 1, 2-3, 4-S 2 74 0.44 1.6 S 1 - 1, 2 -3, 4-5, 6-S 2 77 0.47 1.6 1.29-1.34 100/130 1.35-1.42 100/138 S l -1, 2-6, 4 -5, 3-S 2 56 0.47 1.0 S 1 - 1, 2-4, 3-S 2 60 0.44 1.0 1.43-1.50 100/146 S 1 -1, 2-6, 5 -S 2 63 0.42 1.0 1.51--l.58 100/154 Pl-7, PI-10,9-P2,12-P2 Sl-1,2-S2 67 0.39 1.0 1.59-1.66 100/162 S 1 - 1, 2-5, 6-S 2 70 0.42 1.2 1.67 -l.74 100/170 1.75-1.81 100/178 Sl-1,2-3,4-S2 74 0.44 1.2 Sl-1,2-3,4-5,6-52 77 0.47 1.4 1.82-1.91 70/130 1.92 -2.01 70/138 S l - 1, 2-6, 4-5, 3 -S 2 56 0.47 1.2 2.02-2.14 70/146 S l -1, 2 -4, 3 -S 2 60 0.44 1.2 S1-1,2-6,5-S2 63 0.42 1.2 2.15-2.25 70/154 Pi-7, Pl-10, 8-P2, i 1-P2 S1-1,2-S2 67 0,39 1.4 2.26-2.37 70/162 2.38-2.48 70/I70 S l - 1, 2 -5, 6 --S 2 70 0.42 1.4 2.49-2.60 70/178 S 1 - 1, 2-3, 4-S2 74 0.44 1.6 S 1 - 1, 2-3, 4 -5, 6 -S2 77 0.47 1.6

1) The salue is vahd for 50 Ht it is 20 % higher at 60 HL I

30

5- .~,.i o -.. g oa -L.+ .._A_ _ ~ 'n 1 62-10 AG i APPENDIX 1 (y 'd TABLE 2: Connections for i A rated secondary Transfonner SLCE 12 for Ip = 2.55 - 9.60 A, i = 1 A s Ordering No. 4785 040-VR Termmah No of turns R eshtance 12 1-2 154 0.38 3-4 16 0.05 5-6 8 0.03 7-8 18 0.017 8-9 7 0.007 10-11 18 0.018 11-12 7 0.008 htmary current Connections on pnmary ude Connectiorn on wcondart uJe II hm er consump. F A Turra ratio betw een terminah between terminals () () VA a b tmn at l = 1 A g 2.55--2.67 50/130 S 1 - 1, 2 -6, 4 -5, 3 -S 2 56 0.47 1.2 2.68-2.84 50/138 S 1 - 1, 2 -4, 3 -S 2 60 0.44 1.2 2.85-3.00 50/146 S l - 1, 2 -6, 5 -S 2 63 0.42 1.2 3.01-3.16 50/154 Pl ~7, 9-10, t 2-P2 St-1,2-S2 67 0.39 1.2 3.17-3.32 50/162 S 1 -- 1, 2-5, 6 -S 2 70 0.42 1.4 3.33-3.48 50/170 S I - 1, 2 -3, 4 -S 2 74 0.44 1.4 (g) 3.49-3.66 50!!78 S I - 1, 2 -3, 4 - 5, 6 -S 2 77 0.47 1.6 v 3.67-3.86 43/162 S l - 1, 2 -5, 6-S 2 70 0.42 1.4 3.87 -4.04 43/l70 Pi - 7, 9-10,1 I - P2 S t - 1, 2-3, 4 - 52 74 0.44 1.6 4.05 -4.21 43/l78 S 1 - 1, 2 --3, 4 - 5, 6 -S 2 77 0.47 1.6 4.22 -4.38 36/154 Sl-1,2-S2 67 0.39 1.6 4.39-4.61 36/162 4.62-4.83 36/170 PI-7' 8-10' l l-P", S I - 1, 2 -5, 6-S 2 70 0.42 1.6 S 1 - 1, 2 -3, 4 -S2 74 0.44 1.8 4.84 -5.07 36/178 S t - 1, 2-3, 4 --5, 6 - 32 77 0.47 1.8 5.08-5.35 25/130 S I - 1, 2 -6, 4 -5, 3 -S 2 56 0.47 1.2 5.36-5.07 25/138 S 1 - 1, 2 -4, 3 -S 2 60 0.44 1.2 5.68-5.99 25/146 SI-1,2-6,5-S2 63 0.42 1.4 6.00-6.31 25/154 Pi -7, PI - 10, 9-P2,12-P2 SI-1,2-S2 67 0.39 1.4 6.32-6.64 25/I62 S 1 - 1, 2-5, 6-S 2 70 0.42 1.4 6.65-6.95 25/170 S 1 - 1, 2 -3, 4 -S 2 74 0.44 1.6 6.96-7.17 25/178 S I - 1, 2-3, 4,-5, 6 -S 2 77 0.47 1.8 7.18-7.44 I8/130 S I - 1, 2 -6, 4 -5, 3 -S 2 56 0.47 1.4 7.45-7.88 18/138 S t - 1, 2-4, 3 -S2 60 0.44 1.6 7.89-8.33 18/146 8.34 -8.77 18/154 PI-7' PI-10' 8-P2' 11 -P, S l - 1, 2 -6, 5-S 2 63 0.42 1.6 St-1,2-S2 67 0.39 1.8 8.78 -9.21 18/162 S l - 1, 2 -5, 6 -S 2 70 0.42 1.8 9.22-9.60 18/170 S I - 1, 2 -3, 4 -S 2 74 0.44 2.0 )

1) The saiue h vahd for 50 Hz. It is 20 % hyrher at 60 Hz 3l

Q,AnkpMW a-w + '. .._. ~, ACEA ~ h\\ TABLE 3: Connections for 5 A rated secondary \\ Transformer SLCE I 2 for Ip = 2.85 - 9.70 A, is = 5 A Ordering No. 4785 040NS Terminah No, of turns Reustance l} l-2 42 0.031 l 3-4 i 0.004 5-5 2 0.003 7 22 0.020 8-9 9 0.009 i 10-11 22 0.023 i 11-12 9 0.010 Pow er consump-l Primary eurtent Connections on primary side Connections on wcondary side I8 A Turns ratio betw een terminals between terminah I) I) VA a b tmn at Is = 5 A g 2.85-2.98 62/36 S I - 1, 2-6, 4 -5, 3 -S 2 3.1 0.046 1.8 2.99-3.14 62/38 S l -1, 2 -4, 3-S2 3.3 0.041 1.8 3.15-3.30 62/40 S1-1,2-6,5-S2 3.5 0.040 1.8 3.31-3.46 62/42 P I -7, 9-10,12-P 2 SI-1,2-S2 3.6 0.035 1.8 3.47-3.62 62/44 i S 1 - 1, 2-5, 6-S2 3.8 0.040 2.0 3.63-3.78 62/46 S l - 1, 2-3, 4 -52 4.0 0.041 2.2 } 3.79-3,91 62/48 S 1 - 1, 2-3, 4 -5, 6 -S 2 4.2 0.046 244 3.92-4.05 53/42 SI-1,2-S2 3.6 0.035 2.2 4.06 -4.24 53/44 4.25-4.43 53/46 PI -7, 9-10' 1 1 -P', S I - 1, 2 -5, 6-S 2 3.8 0.040 2.2 S 1 - 1, 2 -3, 4-S 2 4.0 0.041 2.4 4.44-4.65 53/48 S 1 - 1, 2-3, 4 -5, 6-S 2 4.2 0.046 2.6 4.66-4.87 44/42 SI-1,2-S2 3.6 0.035 2.2 4.82-5.11 44/44 5.12-5.34 44/46 -, 8-10, i 1 - A, S I - 1, 2-5, 6 -S2 3.8 0.040 2,4 S 1 - 1, 2 -3, 4 -S 2 4.0 0.041 2.6 5.35-5.62 44/48 S 1 - 1, 2-3, 4-5, 6-S 2 4.2 0.046 2.8 5.63-5.96 31/36 S l - 1, 2-6. 4 --5, 3 -S 2 3.1 0.046 2.0 5.97-6.28 31/38 S I - 1, 2-4, 3 -S 2 3.3 0.041 2.0 6.29-6.61 31/40 S I - 1, 2 -6, 5 -S2 3.50.0402.0 6.62-6.93 31/42 P1-7, P1-10,9-P2, i 2-P2 SI-1,2-S2 3.6 0.035 2.0 6.94--7.25 31/44 S I - 1, 2-5, 6-S2 3.80.0402.2 7.26-7.57 31/46 S I - 1, 2-3, 4 -S 2 4.0 0.041 2.2 7.58-7.95 31/48 S I - 1, 2-3, 4-5, 6-S 2 4.2 0.046 2.4 7.96-8.40 22/36 S I - 1, 2 -6, 4 -5, 3 -S 2 3.1 0.046 2.2 8.41-8.85 22/38 8.86-9.31 22/40 P1 -7' P1 -10' 8-P2' 11 -P', S 1 - 1, 2-4, 3 -S 2 3.3 0.041 2.2 S 1 - ), 2-6, 5 -S2 3.5 0.040 2.4 9.32-9.70 22/42 SI-1,2-S2 3.6 0.035 2.4

1) The value is vahd for 50 Hr. It is 20 % higher at 60 Hr.

32 Printed in Sweden Vaster 5s 41976 Vaster $s Kontorstryck 2000_ _ ____.

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1. wa etne mosn!*g geg's per ogs perent t'ame

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ASEA Item and terminal 803-9381' designations for relay equipment ) n .k ji, f 0f 4 g } -h* _!,I 'I l ' g F- 't' d y If >e o l ' s dtd d ' t'd A 'h 3 'ti j,, e. 'e Y f.x

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• g a ' m Ii.! h.is and terminal designa.

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. ~ _ ~.- AOGA It m end t:rmin:t 003 938U designations 4 for relay equipment O P --~--. ...p.. A c p r;. e n .3-y s q f m i.., o... ; mm 4.; t t h t. 44%. ut i W ' u g m rc w m '*g._ _. s 1:."re u. 5.h. ' L ;) .'t tr a ti e i g 9 t 'em 5."r i 0 ;q yn f ;j

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del y's' 1 (l ' y j ??t 9 ' ' -ll l N !., j ! s' t') f ig a e.,_.-,._- 5 7 5, - - -. y..- - - . i n -- q v., - l l l b ' ,. i.. I."![ g-1 I ... - g % ,r e. - ~ , q. Hs --w, -- _ w. y,r - r,-- c,g g ,. p- - ~e u .L -.4 l i i gy t i l l l' - - - ;- yr - L ,k F l u -- % Tf"- h im] 7 7-f i7 l 4 7 N l l N li L(.p ( 7. J' dry %4N n-1 d k^ g- ~4 l 4 fn h d i :, 1 r - + - +d rt1 Mc- - ~ j l l ,i-rt1 W in e + ei 6 I l * "'" !I I i l 1I I 1 i l I f* g 3 Temrm a sgram .131 M 119-1?* 131 1'8 \\ lr%7116 101 1A $ocaw,[393g 1?1 l A e [ I vi n n no ou a,o r oo oc .c o-y og u c.on c.o e m m oas.v ,o 3a-ool pa do 4 oo -m comec,101 !A on po on to oo so o 1cf Dot,*/ 101 6A

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- oge*- 101:13 A oc[* loa . on oo{ oa od P.c ca( nio va vo Do** --101 12 A )oc o m itm ooj ioo out tr>o oc m 00Do no aa, ;oo ou rua oalum oo' oces po! to on ';a nai ke loc col oo oo< 73 3* oc co' va og ,o e ' Ito no ooj oo a st oo ao ory o c: J, too l { oo fof o- !oo w> e : oce N 101 - 16 A op otro oo cae 3;3 39 kg 33 / kl07 118 1*1 10A A 1 111 FG 4 Connection gwde for e=terna! connec-Icn3 accord;ng to the termrnal diagram Dear view) O

AOCA item and terminal 803 934U designettone r*,,e a for r:1:y equipment \\ O 1 i ,f=,,, o 3

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o o o s.o oc oo ibe i o o o oo se6o on no oo og o o m poco DC cc O(J DC t$3 iDO O 00 0000 iDO 00 00 DQ 90 4 DO 00 QQ ) ye. [p2 q oc rac ( 0 DO DODO 'm tu t"LM j' p.A gg _1,3 2, 00 0000 o DQ o i Do! 30 D 10 0 -d too 10 9 Q ee. Do DQC0 D0l 00 D. Ngoe ' 0e o-Do 0000 j00 04 DO O 00 DQQQ e o et k o o po on no esca [oa 1.c o oc E o o no oci no seco wton itp ot.J. p ooL oo opoh q,ge, io os y 131 tl (131; 26 lit? 416 1119 Mk L101171 111 21 L111411 119 06 u9all M1366-101:323 Fg 6 Some of the terminais used in the interna! connectrons in tig 5 (fear view) I t' . _ _....,. _.. - _... _. _. _.. ~, _. - -. _.. - _ _ ~

M

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AOUA rism and i:rminal rio3 Men dishnstions %.a j for relay equ!pment O j ierm nat t.35eb a'e ria'ked Aitn Og.ves anJ tet-m % g, j 0 g ]q j tets acco'aing to t>g 7 The te'mM dergNhon for a te ay un t cerjenas on me s te of me r%rt-X~D; @:& :$ ed un t not on the fe"nrat Date One and the i sa'ne te'minal 21 see tg B m an RX 4 term.na! F +' GP 'C [thlM t ase can get 'our o De'ent te'm:nai cesignabons C P,- depeng ng on the 5 le of he mo#ed re ay yn t j[{ t o i '7 TIT t 1 iT " ",y..g: T_m Mj l i .j 1g - V Lv:

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g,_ m _y lDC ' tvo CFJ 40 tv] : tr) tp Cp 40! c DCi tyl CV) %0 DC a.:. =l J d' O CC' DO DO, /DC OC ;; Dat DO CiG 001 00 DO DC DQ; DU DQ 00 DOI DO 00 DO DO' )OC 00l 00 QC DO 4 jDC 'g DC 00 DCI ,00 00 DO DO DO DC D0 DC ., 0 C CC: DO! aDC DC 00 00l y ' D0 DO DC DO

DU DC 00 DC 1DC JCi DO 00 100 00 Oc DC, I

8 00 DC DC DO '00 DC DO DG ?DC OCt DC DO JDO CC 00 DC, jDO 00 DC DO !DO DO DC DC /DC DCt DO 00 $ DCJ CO CC DQt O,Q DP DQ CQ

DP Of LQ DP Cp DPjCQ D$

ff CP *h9 3p[ i a r l' l 9 I o i i i r aa na i.. aa u.. _ _ _ _ _..._.,acy,p. Cm cya na s! -.. mi na m aa w don DC DC Da ioO Da DO cop 10 0 Oci 00 00 tod Da oc sce joa DC Do DO lo0 D0 Da ocp !' D o Dog Do D01 ]00 DC Da oc cca ,0c DO D0 00 000 DC DO 000 DC' DO! hl DC DCl 00 DC DO 2CL .3DO DO C0 COL DC: 00l CDC DO CO C00 'i D C DCl 00 DC DO 00 i 00 00! kDC 00 OC DON VDO DQa DO 00 ir D O DC 00 CCI 'DC bDo DCI Do DC l' D C DC DC DCh JDC DOI 00 DO 'i D O DC DC COL PS D? :P D,o l @i - - - _.aDP R,0 l P.P PI 9P DP ] DP_ _ D.0 CP r,c L F D i mm=J J a_.mm - s_ Fig 8 Termina! designation for dit'erent relay i un,ts mounted on me same terminal bases 1 101 '07 101.119 131 101 131.113 10 101 101 113 101.125 131.107 131.119 . g.yg,/ v .. e * *e t C ff, y,y p

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b.Iy 131 125 4 f y p 'f i 5 4 I, I' +

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- &a g -)h131325 l y- /- w l 101.325 l us.s, l Fig 9 Two of the same protective relays the encircied 101 and 131. mounted in an egepment frame The terminal designation for one term:nalin the tective relay has the term nal designa! on ( left unit of the left protective relay wnl be 131101:14A as this retay has acced 30 C mo-l 101 101 14A The same terminal n the right pro-du!es to its pos. tion 131 i I -,e..-,,w--- ---e--n,---mn-s--ve-,--r e .m e men-~rr-r-- me,ww--vm.v. -w,-..w ,_w-,-wo-&

I AOCA st:m and t:rminst sos.e3ete i designations %. i l for relay equipment ) i { i i i l ? 40 4 y a) Har:zontat marking tapeY ', to to m l <~ -^

s _J.L,f.f c) Va'Aing st' ps taped on both 5

ces of l

b) Hor;/ontal inarking t8f p ~~ the rPa'Ung ba' h s d) The C modu:e det' gnat.on for the f ght hand fe'ay in f:Q 9 together w;th the S modu e det g. h8 bon form the item det gnat On 131 f0f the fight hand re'ay l l I i '$4 3 'l I l Fig 10 C. module marongs I i I I i I i ese i Fg 11 VMcal S modvie marking tape e

{ i 1 as. ~ .A ' s i i I j AQEA Item and terminal D03 9381' designations ..a. e for relay equipment 9 1 a,e2, me =, es e se.e.e1 em,ni } b3'T:e5 Jn) 3; 0 3'n's : 0 Yet ID !.'O At e 10 1 zer t f, cr e ea, p T e4 ! a7 o the ^', D C 'e 's CO- , d e j r' ' ~ "tngC3^05 feef Q '2 P 3Ce3 f) .1C tCe 'g '3 re e L L "'t ": t a e ras get .= J' n 3rt'd;tch ; ye 3? :f e

• ght S Je O' WP s

Nre in .e 'e m -Je5 gr r On ' C3 et; We C pope ;ty;$ 8 ;,, +op ep; r ? r g p y,p y,3 the f '.Qg?e tOf *r e 5 "~.c 3 e e. e s }

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i Information RK 926-100 E il RK -9 Section 9 i Relay Division O l 1 N S TALL AT 10th TESTING AND MAINTENANCE OF RELAYS A N

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ATA LIST OF CONTENTS LIST or ILLt'SIRATIONS RK 926-100 E page page GENERAL 3 Front page picture 1 INSTAL'ATION 4 Fig. 1.1. Illustration d ewirig how relays Re:ca,va,ng, handling and can t>e combined together 3 fig. 1.2. Inmilation of a RHCX case in storage . pam 1 3 "ridity protection 4 fiK. 2 Manting of an equipment frawe in a (ubicle 4 .ounting 4 w fig. 3. At tac hing an equipment frame to Electrical connection 8 a cub ule by screws e rig, 4.1. Attm hir's a protective relay in Short-circuiting connector 9 an equipment free 4 Shunt connector 9 fig. 4.2. pattern fot the positienirsg of the sevews 4 Indicating flag, locking Fig. 5. Meunting of a terminal base strip 10 rig. 6. Attaching a plug-in relay to a tetminct base MAINTENANCE TESTS 10 rig. 7.1. plug-in relays in a panel base General 10 ITI' E*2 'I I Fig. 7.2. Connecting leads in a panel b6se Maintenance tests - why? 11 type RXZ 41 for front screw Haintenance tests - how cennection 5 oftent 11 Fig. 8. Cutouts and drilling plans for panel-mounted equipment frames 6 Maintenance tests - how? 11 pig, 9. Cutouts for relay cases in a Test reports 11 panel 7 Fig. 10. Cutouts and drilling plans for Inspection 12 protective relays on apparatus Connections for tests 1; bars for mounting directly on a panel 1 All-or-nothing relays 13 Fig. 11. Removal of a socket equipped Measuring relays 14 lead using an extractor type RTXD Operating times 17 8 Fig. 12. Stripping a lead 8 Measurement of service Fig. 13. Contact crin! ping of a terminal currents 18 socket on a lead 8 Fig. 14 Mounting of short-circuiting Check of the tripping c.onnector RTXK 9 circuit 18 Fig. 15. Connection over short-circult-Example on a periodic ing connector RTXK 9 maintenance test of a Fig. 16. Connection over shunt connec-protective relay 19 tor RTXI 9 Fig. 17 Circuit diagra:n symbols f or in-Testing of loose relays 21 ticating flags 10 Fig. 18 Removal and mounting of an indi-TESTING EQUIPMENT 22 cating flag-locking strip 10 Instruments 22 Fig. 19. Insertion of test plug handle Apparatus for connection RTXH 18 in test switch RTXP 18 12 Fig. 20. Supply of a current relay 14 . hecks 22 Fig. 21. Supply of a current relay via a Relay testing sets 23 current transformer 14 Fig. 22. Connection to a gingle phase cir-MAINTENANCE 23 cult to obtain 0 phase shift 15 Fig. 23. Connectiontoas{nglephasecir-General 23 cult to obtain 90 phase-shift 15 Fig. 24 Connection to a three phase polishing of contacts 23 system to obtain different Tools 23 phases angles between current and voltage 16 REFERENCE PL'gL1 CATIONS 24 Fig. 25. Measurement of service current 18 Fig. 26. Three phase delayed overcurrent relay 19 Fig. 27. Example of a maintenance test report 19 Fig. 28 Connections for testing 20 Fig. 29. Testing of a separate relay 21 Fig. 30. Toolbox for connection work and testing 24

1 ' ~ RK'926-100 C i l CENERAL This information deals with handling and maintenance ) testing of relay units and protective relays composed by l the most common types of ASEA auxiliary, time-lag, current, voltage and directional relays. Testing of i other types of more complex protective relays and pro-j tection schemes are described in separate testing and 4 commi s s ioni ng i ns t.ruc ti ons. l l i min r.. y + B + t jsin + W[9EM 2a s,. lO auss imms l I Fig. 1.1. Illustration t,howing how relays can be combined together (92629) i i I i I 1 a. i h - l l-... }; s ' i l I y , af I i Fig. 1.2. Installation of a RHGX case in a panel (790900, 790898, 790899) m ~i. - mm -_,_-_-e_ -me,.---_m- ..m_m,---.---,_,- ._w,-ww.%,.w._ w-ww-,* -,--

As Le L /f. ) INSTAL.l.ATION j Receiving, handling and storage i { lpon receipt the relay should be inspected for any physical damage, it is recommended that the relay is 1 kept in its shipping carton until it is installed. The l place where the relay is stored should be dry and f ree i frem dust and should have normal room temperature. i j Humidity protection When a relay cubicle i. located a lenger perivJ of time I in an unheated control room with a relatively high ) humidity, for exatple in a new installation, and without i being taken into service, the cubicle should be equipped with a heater which is connected in irunediately. When the relays are in service, sufficient heat is generated ] l in the cubicle by the relays, i Mounting The relays are normally installed in apparatus cubicles a with equipment frames. Fig. 2 and 3 show how an equip-i f rame is mounted and attached with f our screws ment d.ivered with the equipment frame. i I [ N" h t q' k Edi .q ; i ano,J g' r Fig. 2. Mounting of an Fig. 3. Attaching an equipment j equipment frame in frame to a cubicle by a cubicle. (94540) screws. (94538) l When a protective relay is installed in an equipment frame, it is attached from the rear by threading screws, type B6 x 9.5 (No. 2124 2011-279), see Fig. 4.1. The screw is to be inserted through a hole in the support frame anu fastened in the apparatus bar of the protected relay. The number of screws n and their positioning is determined by the width C and illustrated in Fig. 4.2. Sufficient number of screws are delivered with the protective relay. .6 ~ !~.' '. ~; '~N .,. ~ QLp L ,..f .? . _ L f_L ...n j Q;- )4 :- e F i g. 4.1. Attaching a protec-Fig. 4. 2. Pattern for the posi-tive relay in an tioning of the rews equipment frame 4 (94531)

RK 926-100 E 1 1 plug-in relays are inserted in a terminal base and 4 l attached by screws. The terminal base is screwed on apparatus bars, see Fig. 5 and 6 i j p.. .~ .% 3 ,; l.,.f l i HI., fl,[qll inil i f. i /; / . P' l

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j l f@ q ' (,,.satt j i l l Fig. 5. Mounting of a ter-Fig. 6. Attaching a plug-i minal base. (94535) in relay to a ter-minal base. (44541) Single relays Fig. 7.1 may also be inserted in a panel base type RXZ 21 or RXZ 41. These bases have space for terminal-i blocks for screw connection of single core leads Fig. 7.2. The panel base is to be mounted on a vall 'r a panel, i The connections between the socket terminals and toe screw l terwinals are made with leads equipped with snckets on one end and stripped on the other end l 6 i o j '!hl!!!h5I 4.s s .; ; s i 9."#'.. '.. l il,,ii i e.ii. :i

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e i Fig. 7.1 plug-in Fig. 7.2 Connecting leads in a relays in a panel base type RXZ 41 panel base for front screw type RXZ 41 connec tion. (99586) (99176) The leads are obtainable in the lengths 100 mm and 180 rn as standard and ordered from cat. RK 92-10 E. r 5

ASCA .e I i Protective relays and other sets of apparatus can, instead of belug mounted on 19" racks in apparatus cubicles, also be installed on a panel, either (.irectly on the panel or in equipment frames or in relay cases type RHCX, which then are attached to the panel by screws. The mounting procedure is the same as described above. The necessary cutouts and panel drilling tre done according to rig. 8, 9 or 10. By using fixed distance of 56 nra between the holes in Fig. 9 future modifications are facilitated during the installation. By removing the { i peace of sheet metal between the cotouts for two RHGX 4 cases, an RHGX 12 case will fit in the new larger hole. us. i J -1, n s gl i i l"'{ 4 5 Equipment frame qm f } ,r e M .65 .m .a. i el 36 S 6 o cs >j l 4> x> 25 ; I' 8 5 Equipment frame jm I it r e.e i '}1 p -tJ ap. _. a------ t -le, X$ I J., V'6 i_, fu 12 5 Equipment frame su 1+ l e's e

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RK 926-100 E (, cut out witn recommendsd specing i I-(7 i -Q) T 00~* -- ~~ ' '* u s n' - '~ - 1 4 4 i_ 1 75 6., .J r r i 1- - -4 : ~c.. - t c-c, 4 se, I t 1 c - srrlse - er e 9 / CMGR */ G 34 4 190 56 112 -.= anon o suas o k - f 96 ~ $0 : --- 196 - J ( 3 Fig. 9. Cutouts for relay cases in a panel (dimensions in mm) -i n. T '- -~ ~~ + J 154 14 3 iL v + -f= ~ L g R g sco g arrec r.3we n,ng wo n as ; did** cf aw gr Haio Jeritosq pian 0 4 2 [ tzc' 34 h. 18C ??6 /e( '68 4: g. 30C ? J'a hnd'n 3ec 1 52 p  ; g 126 sy( - gg. +-- _. - *le + + - 4sc ns g + _ .g r y 'in 3-3' 63 '26 ' (q e eot sze ) v e.,.. Fig. 10. Cutouts and drilling plans for protective relays on apparatus bars for mounting directly on a panel (dimensions in mm). l U

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• 4.

ASEA i l Electrical connection The connections are made with socket equipped leads. The i leads should be pushed into the terminal holes until a " click" can be heard confirming that the locking clip in the terminal base locks the lead in correct position. Su screws or soldering is required for the connection. If a i lead should be removed, a special extrac or type RTXD according to Fig. 11 should be used. I i l I l f Fig. 11. Removal of a socket-equipped lead using an extractor type RTXD. Catalogue RK 92-10 E describes the principle for the connections. The catalogue also lists ordering data and i I Cat. No.'s for ready-made socket-equipped leads of different lengths and versions. It is also possible to ') i attach terminal sockets to leads with a special contact crimping tool Fig. 12 and 13 illustrate how a lead is stripped and how a terminal socket is crimped on the lead. The tools used are included in the tool-box which is described on page 30. i O e 1 l l 4 Fig. 12. Stripping a lead. Fig. 13. Cc, tact crimping (91816) of a terminal r socket an a lead. (95977) i h i'

s RK 926-100 E Short-circuiting connector A short-circuitirg connector type RTXK is always delivered together with measuring ac relays and the supply to such relays must always be done over the short-circuiting connector. The connector is mounted at the rear of the I terminal base accarding to Fig. 14 h M e i e es e .e. 1 I \\ es es b es se se se se es ee **

e::

( l l o ( Fig. 14 Mounting of short-I circutting connector RTXK. (94536) Shunt connector Measuring relays for current supplied from a shunt are connee:ed in over a connector type RTXI as short-circuit-ing of the supply circuit is not desired when the plug-in relay is withdrawn f rom its terminal base. This shunt connector is mounted in the terminal base in the same ) wav as shown in Fig. 14 Fig. 15 and 16 illustrate the difference between the two connectors. \\ c,,,+ rew

s,:,..

w~s meessruv Dese woraM mess.ny case exacM 3 -= -= I % uver f'ff - - 131lHil f ""'5 9 ( ^"r yp i f l er /~ Y /7 ^ /4 Af/A Fig. 15. Connection over Fig. 16. Connection over short-circuiting ahunt connector connector RTXK. RTXI. N 9 m

ACEA Indicating flag, locking strip Certain prc.tective relays are, when delivered, equipped with some or all indicating flags blocked. The indicat-ing flags that should be blocked, are illustrated by the symbels in the circuit diagram of the protective re l ay, see rig. 17 ) 1 I N 2[7' \\#27f 225 13 229 1v1 225 226 5 6 Symbol for blocked Symbol for flag without flag blocking. The indicating flag is reset manually Fig. 17. Circuit diagram symbols for indicating flags, j When a current relay type RXIG 2 or a voltace relay type RXEG 2 is used as a minimum relay, the flag should always be blocked. The flag-locking strip is removed or mounted according to Fig. 18. ) When mounting the flag-locking strip, its top end (A) is inserted in the second indicating hole from the bottoa of the flag holder and i pushed upwards until tue

1. p.

other end (B) of the strip is snapping into ( 7 i the Icsest indicator ^ l-

hole, t'

.t[ When renaving the strip, j - its bent part (C) is pulled and then the I d',. strip is pushed down- \\ wards. Fig. 18. Removal and mounting of an indicating flag-locking strip. i >1AINTENANCE TESTS Ceneral Before a relay or a protective relay is delivered from ASEA, it has, in the manufacturing process, been sub-jected to several careful tests. All types of relays and their integral componer* have been subjected to exten-sive laboratory testing during the development and design work. Prior to series production of a specific relay, it is typetested according to national and inter-national standards. Each individual relay is in normal production individually tested and calibrated and checks are done so that its function and data correspond to specified characteristics and technical data. A protec-tive relay composed by various plug-in modules is function-ally tested through its test switch before delivery. Protective relays installed in an apparatus cubicle are checked in various ways before shipment. 10

kK 92tr 100 L Maintenance tests - why? There are great demands on protective relays with regard to performance, operating time, etc. Therefore, it is -( 7 necessary to, at regular intervals, perform maintenance Q testing. Maintenance testing is a secondary test where f-the following checks are done: o if the protective relay operates at set operating ( value o if releasing and blocking functions are in order o if alarm and indication are obtained Maintenance tests - how often? How often the tests should be performed depend on several g factors, for example the importance of installation, environment conditions, simple or complex equipment, static or electromechanical relays. Normally, protective relays are maintenance tested each or every other year. { Maintenance tests - how? If the protective relays are oc9ipped with test switches of type RTXP 18, they can be

• 'ed without any hazard to the equipment in service. Ru ever, please do observe that the protective relay cannot operate in its normal manner during the time the test is performed. Should a fault occur, a backup protective relay will operate O

instead. If the protected object can be taken out of /hI service during the testing, this disadvantage can be avoided and it is then possible to test the complete circuit with all associated apparatus. Test reports It is important to keep accurate equipment reports, test reports, and relay setting reports to be able to: o compare with preceding tests if there has been any ( change of the operation of the protective relay o observe how long time has passed since last testing and plan when the next testing should take place ( o see if the protective relay has changed, for example if some relay units have been exchanged o to see when and how the setting of the protective relay has changed After larger service disturbances, those reports are valuable when analysis of the disturbances should be done. \\ G, s 11

________..__________.m_.... I b$ ASEA i Inspection Before a protective relay is testea, it should be in-spected, It is then recommended to check if the protec-i j tive relay or the relay units have say visible faults, if there are deposits or contaminations inside the cover, or if there are any burnt contacts, if necessary, i dust should be removed frem the covers. If the covers are t o be removed, dust removal must be Jane in advance so that stirred up dust will not fall down into the 5 relays. i T Connections for test i l t Before a protective relay is tested, the tripping cir-i cuit should be blocked, current and voltage circui t should be opened and the protective relay should be isolated frem other equipment in the installation. This ) must be done in a sequential order without any inter-ference of the operation of other protective j relays and equipment in the installation. The necessary internal 4 { reconnections of the circuits fcr the testing are in ASEA protective relays performed when the test plug handle is inserted in the test switch. See Fig. 19. When this is done, all in-and outputs of the protective relay are available for connection to the test equip-4 ment. l l e en I, + I,1 m N l ) ,og h T i s p. -N ) Fig. 19. Insertion of test plug handle type RTXH 18 in test switch RTXP 18. (89393) The relays should be tested in their normal working positions, that means plug-in relays inserted in their terminal bases and with their covers fitted. The test-plug handie should first be connected to the test equip-Instructions on how the connection should be done ment. can be seen from the circuit diagram for the protective relay and from the function markings on the contact units in the test switch. The connections are then checked and the current and voltage sources are regulated down to zero and the test equipment is switched in to its supply. The test plug handle is then inserted in the test switch and the test can start. When testing static relays, the auxiliary n voltage should have been connected to the protective y relay at least ten minutes before th measurements /I start. a 12

RK 926-100 E If for example several three phase overcurrent relays should be tested, it is recommended that a switch with the positions 0-R-0-S-0-T is connected between the plug handle and the test test-in such a way that when the switch isequipment.,This shoald be don <8 l \\ in position R, current N,_,/ p> ts supplied to the protective relay through the handle plugs 3-4, in position S through 5-6 and in I position T through 7-8. The switch facilitates the testing since one phase af ter another can be tested in the protective relay without any changes of the connec-tions. Af ter testing one protective relay, the test plug handle is just moved to the next protective relay of the same type and the testing can immediately start again. No reconnections are necessary. All or-nothing relays These relays pick up, sometimes after a possible delay, g when they are connected in to the rated voltage and drop after a possible delay, when the voltage

out, is inter-rupted.

Auxiliary relays and time-lag relays for voltage g when delivered, adjusted to operate are I securely down to 80

• of the rated voltage indicated on the rating plate even if the relay has regular service temperature. The relays can withstand continuous supply up to 110 0 of rated voltage. If the rated voltage is indicated with a i

range, for example 110-125 V, the operating range 80-110 ' is applicable to each voltage within that range. g [_,} Auxiliary relays for current supply should pick up for the current indicated on the rating plate. \\/ ( A regular operatier.:1 check is recommended also for auxiliary relays and time-lag relays already in service. The check can generally be simple. Auxiliary relays checked that they pick up when connected in to 80 are of the rated voltage and drop out wFen the voltage is k interrupted (at ac) or by slowly regulating the voltage down to zero (at de). The voltage is momentarily connected in and momentarily intertupted for time-lag relays and the operating time is checked, in installations where the voltage limits are critical, l a mare accurate check is advisable and it should be .nvestigated that the pickup and dropout talues do not I diviate 1 too much from the values of new relays. i l l l ,-m e 1 -w 13

.!k AOGA DC relays and ac relays supplied over rectifiers have a somewhat higher pickup value when warned up during regular service due to the increase of resistance of the coil. Directly supplied ac relays have insignificantly changed values when warmed up during regular service. The dropout va'.ue should be larger than 5 " of rated voltage. If it is considerably lower, there is a danger s that the relay will be sticking in the near tuture (the relay will remain in its pickedup position due to rena-although the voltage has been interrupted). In nence addition, tests should be carried out on ac relays by interrupting the voltage instantaneously since the risk for remanence sticking is greater than when the voltage is slowly reduced. Measuring relays Ct'RRENT RELAYS should be supplied over a large series resistor (at least 10 times the impedance of the relay). g See Fig. 20. R Zr / O j C . / A O / oh R > 1)lr Fig. 20. Supply of a current relay. If a high current is required, a current transformer can be used as illustrated in Fig. 21. The permissible { burden of the current transformer must not be exceeded. 5.' R fr {A ~ / C O / 1" u Zr ~ l T*> p2 R> 10 {7, ) Zr ) Fig. 21. Supply of a current relay via a current trans-

former, Electromechanical relays often have a temperature depend-ence. The supply should therefore be regulated up to the pickup value and down to the dropout value within a shorter period of time than 10 s. The movement of the relay should be checked that it is distinct and that its operation is not slowed up in any mid position, for example when a contact is making or breaking.

i /

RK 926-100 E VOLTAGE RELAYS should be supplied f rom a variac or a low resistance potentiometer. Check on the voltmeter if the i voltage _is influenced by the pickup action. If the voltage does not correspond to the increase of the variac, the voltage source is not sufficiently strong. t DIRECTIONAL RELAYS have an operating value that must be tested with a certain phase angle between current and voltage. The phase angle should be approximately as i larte as the characteristic angle of the relay !!oweve r, a diviation of + 20" can be tolerated since the measur-ing error only will be 6 5 (cos 20 = 0.94). If an angle error is compensated, it is possible to tolerate even larger diviations. That means that all types of single-phase power directional relays can be tested with a simple test set without phase shifters. The phase angle 0 is obtained by connecting the current j ( circuit via a series resistor to the voltage that sugplies the voltage circuit. See Fig. 22. The phase angle 90 is obtained by connecting the c u r r e.:t circuit via a capaci-I ' tor to the voltage that supplies the vo.tage circuit. See Fig. 23. Certain other phase angles can be obtained j ( by connecting the current and the voltage circuits in different ways in a symmetrical three phase system. See Fig. 24 l 0 m o 4 R e t = = 1 U 4 d o u o o I o The current is approximately in phase with the voltage d (phase angle 0 between current and voltage) if the a resistanc R is 10 times larger than the impedance of the current coil. Fig. 22. Connection to a singL phase circuit to obtain 0" phase shift. k 0 m o I n it il =_ V U 0 o J o The current leads the voltage with approximately 90 if 6 10 the reactance

C ohms is 10 times larger than

= 2t f x C t the impedance >f the current coil (C = the capacitance in af) Fig. 23. Connection to single phase circuit to obtain 90 phase shift. 15

AQ AGGA p R S ~ T N J N T = =s IST UST p UST IST IRN d IRT 0 INT .f fco9 n 4 IST UST 3o.Ing C. o

• v

]SN O ISR INR t Phase angle With the voltage circuit connected to U the current cirucit is connNtedto 90 capacitive R-N 60 capacitive R-T 30 capacitive N-T 9 0 S-T 30 inductive S-N 60 inductive S-R j 90 ir.ductive N-R Note 1. It is presupposed that the three phase system is symmetrical even with the load connected. This can be checked by for example measuring the three voltages between lines. Fig. 24 Connection to a three phase system to obtain different phase angles between current and voltage. O }/ -v

RK 926-100 E REGULATING RELAYS should often operate for very small changes. Therefore, it is usually necessary to current use a constant voltage source to be.able to check those [~N current changes. It is also necessary to check that the i constant voltage source supplies an alternating voltage which has a good curve form. These relays MUST be tested in service-warm condition with the cover fitted. Operating times Operating times can be checked in different ways depend-ing on how long operating times are required to be measured. A stop watch is generally used for checking long times, longer than 1 minute. An electrically operated watch with a synchronous motor or of spring type is used for shorter times. When operating time checks are made with the relay testing set type TURE, AEGs "Sekundenmesser" is usually used. It is started and stopped by r: lays included in h the testing set TURE. When there are times shorter than approximately 100 ms, special time recordera should be used. It is then necessary to take into consideration the operating times of possibly used automatic euqipment for starting and stopping. Releys with inverse time lag are checked at 2-3 points, suitably 2, 4 and 10 times set current. Relays with independent time lag are checked with a current which in twice the set value. If the relay has an instantaneous function, this func- [~'% tion should be checked at the set value. The test must () ( be done rapidly to prevent that the relay and the test-ing equipment will be overheated. Time-lag and auxiliary relays to be checked with regard to operating times, should be supplied with rated voltage. Overcurrent relays are suitably supplied with three times the set operating value, but overvoltage relays are supplied with 1.3 times set operating value. The g time for undercurrent and undervoltage relays are meas-ured at instantaneous decrease of the actuating quantity to zero. Thermc1 relays with a large time constant, should be g checked at a constant ambient temperature and the current should be very carefully maintained coastant. As a rule, this is often very difficult to obtain when checks are made at site in an installation, therefore small devia-tions in the operating times ususally are obtained. A] N. f

3 ASEA Measurement of service currents After a check it is recommended to measure the service currents and service voltages that the protective relay obtains. The red trip-block plug type RTXB should first be used to block all tripping circuits. The current measuring plug RTXM, Fig. 25. With built-in overvoltage protection, is connected to an ammeter and is inserted in the test switch. The plug can easily be moved between the different phases and different service currents can rapidly be read. I i a 0 l Fig. 25, Measurement of service current. (94537) l The zero-sequence current to earth-fault protective relays should be measured. The current amounts normally to just a few milliamperes so it is possible to see if the current circuit is " alive". l The neutral-point voltage to an earth-fault relay is I checked with a voltmeter. The tips of the test leads are put directly against the contacts in the appropriate contact units of the test switch. The voltage is nor-mally 0.1 to 1 V. However, voltage can be considerably ( higher due to harmonics if current convertors are con-nected to the network. I l Check of the tripping circuit l When the protective relay is given an operational check, a tripping pulse is obtained on the contact No. 17 of the test switch. It is possible to check that contact 17 really is closed when the test plug handle has been i removed by using a voltmeter and measure between con-tact 1 and the right side of contact 17. The measurement is then done through the tripping magnet of the circuit breaker and therefore the complete tripping circuit is checked. Please observe that the test system does not have its built-in security during this test. If the instrument should be set on Amp instead of Volts, the circuit breaker naturally is tripped, therefore, greatest care is necessary. s .n. ,m--.-- .~me,...-

_. - - - _ _ _-.---. -. - _ -..-. ~ _ - -. -. RK 926-100 E Example on a periodic maintenance test of a protective relay i l-( The example below describes how a three-phase delayed overcurrent relay is tested. See rig. 26. l i, i e g; ;;;.I 7 -7 -t i = '4.37.ta, ; y l '/I:. ~ ..~ 4% t res I i i$. r( i n'- ~ y r Fig. 26. Three phase delayed overcurrent relay. (95403) Begin by inspecting the relay. Check if the relay has any visible physical damages. The cover hs'is for the setting knobs should be fitted with plastic plugs. The i settings should be checked for the different scale knobs j that they correspond to the relay report. See Fig. 27. l l i l l t. w. lO* [! ..f i,> a.- i i i i 'Oe ?' C.'"?'"'l '.' ; ?! (.:."g, lO.P 1 '.: '? ? ? ' Y TT" 8 I %l a;. -!r :-a O ! s. n.. ( 'Ri s..c. ' p-sj Y ] j, ~~ ~ p.= n.;n t u.,,.4 s g o.. 9 31 3, 2. a..ni q s.a. i.y. a. i %.!u jl

,g

( 15 m l ssl l [;owsJ~mQ-W yr si \\ i vd a We n Fig. 27 Example of a maintenance test report. Then the testing equipment is connected according to Fig. 28. Check on the circuit diagram fer the protective relay and on the terminal markings on the test switch to which terminals on the test plug handle the different test leads should be connected. s 19

s= ASEA Test nQ Set troe TURE i ,,, ( (, l TMi c a TM2c o Vf n Cth sgn gyg A Test-Olv0 handle E 4 5 6 7 9 7 ,g yl -, .h.A k.1A'~D ' f(s~T2 * $- y= A 1 ~ l f f ff 'f 101 Test sattch W,se, $8~~$e, f$e LL.'lo. e ,,,,,,ggl ' l + a a ni et St si 71 7, ' ~ 107 119 307 ) 10 7 11 9 Current relays 'r i~ r ur r.1 s.s zz e-m 307 in r-n)s l'.n y; r-L-ns y > Ilw 11 " n, s., I >

:n m

ii i ' Ii 4 i I i I y' l 3f9 319 Time-tag relay l "Ijr,l I H y 'l gg* '?' i C f I f ?6 lw 77 l l no %o ,,' 325 32S signat retay ^ I l l te {----4--_---+-_-___ g I j j !5 W tr Pro o I l I I i b l ,,,p,r--- l%p-l i-~~---------___- 2t I o,p - b f 23 ns Fig. 28. Connections for testing. Then turn down the knob for the current regulation to zero, insert the test plug handle in the test switch and close the main breaker of the testing set, First the operatitig values of the three current relays should be tested. Press the 03-button and increase slowly the current until the relay picks up. Then decrease the current until the relay drops out and record the operat-ing value as well as the resetting value. Repeat the check once more to check if it is not too large a dis-persion of the value and then write the result in the relay report. O 20

l i RK 926-100 E The test is then repeated for the two other current t relays after that the test leads in the test plug handle j terminals 3 and 4 has been movci to terminals 5 and 6, i l and 7 and 8, respectively. To make the check easier, it is possible to connect in a switch between the testing l set and the tesc plug handle which is described in the l section " Connection for tests" above. i-I The operating time should then be checked. Turn up the i current to the protective relay to approximately 3 times j the operating value and then interrupt the current with the OFF push button. Check that the time-measurement i device is in its zero position and that the switch d on { the testing set TURE is in position M. When the ON push i j button is pressed, a relay in TURE starts the time- \\ measurement device and at the same time the current relay picks up and starts the time-lag relay. When the time-lag relay picks up, a signal is supplied via ter-i ^ minal 17 in the test switch to a relay in TURE which { stops the time-measurement device. The signal relay j picks up simultaneously and indicates that a tripping l pulse has been obtained. Read the time on the time-measurement device and check if the indicating flag of the signal relay has dropped. Repeat the test once more and write the result in the test report. The operating time is necessary to check just for one of the current relays since it is the same time-lag relay for all three current relays. When the operating time has been measured, the test is over. Put the TURE main switch in the OFF i position, remove the test plug handle and reset the { indication. l l Testing of separate relays 4 4 k. A special testing base is available for testing of separate relays. It consists of two parallel connected terminal i bases. The relay to be checked is inserted in one of the j hases and the currents and voltages required for the j test are connected to the other terminal base, see l Fig. 29. The tgsting leads to be used should be equipped i with COMBIFLEX" pins in one end. The toolbox for con- } nections and testing, which is described on page 30, l contains such leads. i 4 J g ' r-i ./ 7 4 Fig. 29. Testing of a relay. (94532) - -, -, - ~ - -, - -,,

AO3A TESTING EQUIPMENT Instruments The instruments used should be of go.d accuracy class and they should have been tested at regular intervals. The so-called universal instruments are normally used. Such instruments usually have a built-in rectifier. Please note: Should harmonics be present, a moving coil instrument should b= used. The highest possitie current scale, which gives a read-able value, should as a re'.a be used, especially when measuring low currents, since the internal resistance of the instrument increases very much at low scale ranges. If an unnecessarily low scale is used, the current conditions in the circuit can be changed so much that the measured values are useless. To judge if the measured value can be relied upon during a test of sensitive protective relays, it is necessary to judge if the internal resistance of the instrument influences the measured value. Data about the internal resistance of the instrument at different scales can be obtained by the manufacturer of the instrument. Other resistances of the circuit are calculated or estimated with the aid of the power consumption of the relay and the current I scale. The additional resistance VA Z = -,, where VA is the volt-ampere consumption of the relay r

.r and i is the lowest settable value on the current scale 5 If the impedance of the instrument is just 10-15

of 2, no serious measurement faults are caused. AECs "Sekundenmesser" type S1 is recommended to be used as a time-measurement device. It is graduated with scale marks of 1/100 s. However, there are other makes avail-able with the corresponding graduation and accuracy as well as electronic time-measurement devices. Apparatus for connection checks When checking the connection of a protective relay with static relay units, such apparatus that can c au s e h a rm-ful overvoltages are not allowed to be used as these voltages can destroy the electronic components in the relay. There are harnless apparatus for connection checks available on the market. Static relays are not allowed to be impulse tested or insulation tested with for example a megger. The relays should be disconnected if cables and other connections should be insulation tested. O

(- .~ m; RK 926-100 E -Relay testing sets-ASEA produces;several types of relay testing sets. The choicelof suitable test sets depends first on which type of tests should_be performed, secondly which type of relay or' protection scheme should'be tested.- -s All available testing sets are described in separate -Informations according to the list below: Information-Typ. Application area RK 90-101 E TURE Secondary testing of relay units and protective relays RK'90-102 E TURB Secondary testing of distance. relays RK 90-103 E TURG 1000 Primary testing of current transforme;s and relays con-nected to the CT's RK 90-104 E TURF Testing of frequency relays RK 915-300 E TURH Secondary testing of distance relays and other types of relays MAINTENANCE General Since almost all ASEA protective relays contain ~just i static relay units, except auxiliary relays, no special l maintenance is required for the relays. It should be checked that all relays are equipped with their covers and.the holes for the setting knobs are fitted with \\., plastic plugs. Polishing of contacts Should burnt contacts be observed when inspecting the i relays, a diamond file or an extremely fine file can be used to polish the contacts. Emery-cloth or similar products must not be used as insulating grains of-abra-sive may be deposited on the contact surfaces and cause a failure. Tools A toolbox is available for connection work and testing, see Fig. 30. The box contains for example screwdrivers. stripping tool, contact crimping tools, and certain parts of the testing system COMBITEST. The box is de-scribed in Catalogue RK 92-10 E. For overhaul and adjustment of relays, a toolroll is available. The-toolroll is described in Catalogue RK 91-1 E. m

. - --- -.~.-... - _. -. - -... -..~ - -- l Iniormation RK 326-100 E l i - w i l I Fig. 30. Toolbox for connection work and testing. (01813) REFERENCE PUBLICATIONS Spare parts of type COMB 1 FLEX l RK 92-10 E Testing sys tera COMBITEST RK 92-11 E ( l Relay testing set TURE RK 90-101 E i Relay testing set TURB RK 90-102 E l Relay testing set TURG 1000 RK 90-103 E Relay testing set TURF RK 90-104 E Relay testing set TURH RK 915-300 E Toolroll RK 91-1 E i t O ASEA Relay Division S-721 83 VASTERAS, Sweden t Tel. + 46 21 10 00 00 i l i Reg 560,74r. p,. w,3 a e _, s...,

o l High Speed Phase and Ground Protection for Multiple-Winding and Auto Transformers l ~........ ~..... - .y 3,;,_. _ p _ J,_ t t 1 9 7 - S L + "^ lillli 111111 til!!! rt 1 I l l m q i,- Qs. r s } d? 1 ~~ D l \\ [ Asc I ry. 25. Three ph.ne trandarmer dif ferental rein type R ADSI: INTRODUCTION The purpose of these Test instructions is to augment ' Reference Publications the information in the Application Guide on accept-

a. Sales Information 62-10 Si ance and routine testing of the DSE. Generally the information in the AG is adequate for checking the

b. Application Guide 62-10 AG r.formance of the DSE relay. The following instruc-c Test instruction iThis publicatic 1 02-10 Tl tions will deal with other aspects of startup testing

d. COMBIFLEX System and also provide more details en the individual com-Sales Information 92-10 Si ponents of the relay. These instructions are based Application Guide 92-10 AG on the user being familiar with the testing information in the AG and on the availability of the AG for refer-

e. COMBITEST System Sales Information 92-1I SI ence to drawings and details provided in that publica.

tion. t Note: Figures numbered below 25 and Tables Application Guide 92-11 AG numbered below 10 are in the Application Guide,

f. Accessories:

those figures numbered 25 and above and Tables 10 II) Auxiliary Relays RXMS 1 21 - t o SI - and above are its this Test instructions.) These instrue. Lock out Relays RXMVB 4 25 -10 SI . tions contain adequate detail for servicing these relays. lioweser. for those interested in a more complete explanation of the COMBIFLEX system and the method of marking, they can refer to Reference publications. '. =, $ = lL

4 -~ MDEA ,7 LIST OF CONTENTS i LIST OF ILLUSTRATIONS Page Page + INT RODUCTION 1 i Fig. 16 AG Test set up for checking DSE TEST INSTRLMENTS AND TilEIR USE 3 l operating charactenstics (except Sth armonic restraint) 13 STARTUP TESTING 3 h AUNILI ARY CT's 5 [ 17 (a) AG TEE 4 t 143) measunng unit, RELAY ACCEPTANCE TESTS 6 i rear view, showing location of PERIODIC TESTING o I terminals used or opened DESCRIPTIVE PflYSICAL DETAll 7 l dunng certain tests 15 WIRING INTERCONNECT 10NS BETWEEN 25 Three phase differential relay MODULES 7 type RADSE I - VOLTAGE MEASUREMENTS 8 26 DSE units 6 Auxiliary Voltages 8 27 DC interconnections between units of DSE 7 Minimum Pickup Reference Voltaees 8 3 Differential Current to Voltage 9 28 DC interconnections to phase Restraint Current to Voltage 9 l indicator SG 1 7 !!annonie Current to Voltace 9 s 29 Interconnections between Integrated Output Voltage ' DSE 43's and TUC 4's S 9 TEE 4 CAlll3 RATION CilECKS 10 l 30 DC signal simulation for check. Retramed Signal level Detector 10 i ing calibration of restrained signallevel detector in TEE 4 10 ' Unrestrained Signal Level Detector iI Output Tnpping Relay. Target and 31 DC signal simulation for check. Phase Indicator il ing calibration of unrestrained + OVERALL PERFORM ANCE TESTS 12 instantaneous signallevel Fundamental Frequency Tests 13 detector i!

nd llarmonic Restraint Tests -

14 32 Testmg circuit and procedures for 5th amtonic restramt 11 5th liarmonic Restraint Tests 14 l h l Indicator Tests 14 Three. Phase Tests 14 i inter. phase Te>ts 15 CALIBRATION 15 SERVICING ELECTROMECllANICAL MODULES 15 TROUllLE SHOOTING 16 ACCESSORIES AND SPARE PARTS 16 LIST OF TABLES Page - Table 2 AG Test of basie DSE with three input restraints 12 3 AG Test of DSE with four input restraints 12 4 AG Test of DSE with five input restraints 12 - 5 AG Test of DSE with m input restraints 12 6 AG Variable restraint test ',ata 14 10. Checking of auxiliai> voltages 8 !I Minimum pickup reference voltage 8 12 Test point values for basic DSE 9 13 - Test point values for TUC 4, 10 14 DC calibration check of TEE 4 restraint signal 10 15 DC calibration check of TEE 4 unrestrained signal 11

} e -w s. ..y ,. v; . ;, s. . r =. ; ! pfr

s..

_i i 4 + i ~ 2 .l 1 4 i 4 [ . Changes from superseded edition a.- i 4 Over R 2 1 . a -a L _ _ _ _ _ _ _ _ _.., _ - _.. _ _ - _ _.....,. _ _.. _ _.. - - _ ~ ~ - - - - - - - - - - - ~ _ - -

~ _ _ _. - - - - ~%'- ' &#4 '). sa t w g,' 1 -j 4 e' Changes from superseded edition O Page 3, STARTUP TESTING, point 4a, new text: 1 - "44 kV showering are test" L 5. Item 4, first paragraph. new text:" Note

that., the rated salue" s

3 i i 7 New paragraph; " Versions without.. mea-suring unit"

10. Table 14: revised values f

t 1. Table 15: revised head and values 13, item b: revised text ,e l 14, Table 6: revised values - 2nd harmonic restraints: revised formula f ~15. Inter-phase tests,. Item 7: revised text . e 4 P h O e.- .m -........._.._,...___.----.-..--_..-_......-m...-

i J t 6210 Tl TEST INSTRUMENTS AND TilEIR USE b) Secondary current injection: As an alternate The relay has been tested and calibrated using sine to the primary current test, insert current at ~x ) wave currents plus specific values of harmonics. The each main CT secondary terminal in parallel v meters ustJ for calibration are rms inot rectifier) with CT secondary. type for ae rneasurements anJ true de, moving coil, c) These current tests do not check phasi or laveragmei t> pe f or de measurements. It is essential polanty of the C1's. Phasine cheeks a usuah that sinular t> pe meters be used m the fielJ if rehable. ly deferred untilload checkme. Polants checks consistent, results are to be attained. can be made with the de "kicbtest". C'onnect When th? rectified Je method n used as the 30urce of a de soltmeter of a mosmg coilinot rectitier)

nd harmonie. the fonnula gisen in the AG for ca.

type to the secondary of the CT. with the culating the amount of :nd harmonie is based on meter + on the polarity nurk. Momentarily readine the de with a true de ammeter tot moving connect across the pnmary wmding a de solt-coil ty're) as well as reading the ac with a true rms age of i 1/2 to 6 solts from a dry battery. type ae meter. When a separate 2nd harmonic ior 5th With the battery positise to the CT prunary harmonic) generator is used to supply the hannonie polanty mark, the meter should kick up scale restraint current,its magnitude should also be meas. when battery is i;onnected. It shoulJ go ured with a true rms meter, accurate at that frequency. negative when battery is dbconnected DC voltages should be read with a 10,000 ohms per volt de voltmeter with a true de charactenstic. 3 Inspect other winng and compare with drawine W, hen insulation measurements are to be made it is provided with the transformers and rela > for ob-vmm or oson DmMW m em pnident to use as low a voltage as feasible f,or the de-sired results. [ht relay has been production tested practices, circuit continuity can be checkeJ wita with voltages up to 2.5 kV, but such test voltages are ohmmeter or by other methods. An> of these not recommended f or field testing. Any measurements .inethods are suitable to check the proper fonction-mg. tot swtd and anomted Nup for made on the mter-module wiring should be at a volt-ace not to exceed that normally expected on that proper opening or shorting as mdicated on the n wire and from a high impedance source of at least {) 10.000 ohm / volt. In general, measurements on inter-module winng beyond those given in the trouble 4 Insulation tests: The DSE is produenon tested to shooting section are not recommended. Many of y,5 kV. In the held the current cirema ate usual-these circuits terminate in diodes and transistors. The ly meggered to earth with 500 V max. This test can results of measurements made on these circuits are Ao be used to confinn that there is oniv a smele ten pnd on each current circuit. C onfinn the consequences of the test equipment characteristics as much as on the status of the circuit itself, and hence that each ground connection is restoreJ conectly are meaningless and are not recommended. before proceeding to test another circuit. DC. cir-cuits are usually checked f.or grounds aith a lower test voltage to avoid inadsettent damage to other STARTUP TESTING

1. 9" a)

The DSE has been type tested with a 5 kV im- .There are no unusual requirements for comnu.sstomng a set of DSE transformer differential relays. Ilowever, pulse, a 2.5 kV SWC test and a Ja kV showenn; are test in addition to the noted dielectne tests in view of the several interrelated components, the These type tests are usuall> not repeated in the following is offered as a guide. tield. I General inspection: Inspect all name plates for proper ratings of equipment. Continn the proper 5 Inp circuit continuity tests. Manually operate the taps on main CT's and auxiliary CT's and correct MS 1 output tripping relay by msertmg a pm or voltage taps. small screw dnver through the available opening in the cover. Confinn that the RTXP is rest switch 2 Current circuits connections: trip circuits are wired according to the appropnate a) Primary current injection: where CT ratios are diagram. Use the red trip-block plug R I Nil i AG low enough. using a low voltage source, apply I'.ig. 8) to open the respective trip etreuits in the RM M swh fS a reasonable current in the primary circuit of ) each main CT. By means of an ammeter in-ai The MS 1 output relay may be electnealiy serted into the various secondary circuits con-operated by applying the rated de + voltage tirm the current winng and ratios of each mam to terminal 143:222 on the rear of the i f E 4 and auxiliary CT. module. t See Fig. l-'a for physical locanon L 3

R AOEA b) Using the RTXH 18 test plug handle inject a) To minimize the frustrations from sneh a situa-current into the various DSE inputs (see AG tion it is usual to take oscillographic records Fie. 7.11 Fig. R or appropriate drawine for of the imtial enerrizations oflarge transfonn-test switch detaih and obser e that the MS I ert When this is not practical the energizing output relay picks up and that the operation source may be selected so as to mimmize the indicator m the IEE 4 functions if the SG l pov;bihty of a severe mrush causmg a impro-phase indicator is provided the respectise phase perly installed relay to operate. Inrush is indication 3hould also occur. nummited by: c) These two tests provide a compl te check of w Enerptzing the higher voltage wmdmg. the tripping capability of the relay system. <be Enerpzing trom the weakest source. However,if it is a testing requirement that an te Energizing a delta cormeeted winding. overall tripping test t e made in one test, i.e" Seldom can all of these condition 3 be satisfied. eurtent into relay to t.reaker tripping, a modi-fication of the above pneedure will be re-Their relative merits for reducine mrush are about h the order hsted A nul5Jjusted circuit quired. Remove the RT.Vi 18 test plug handle. To block the tripping of ora or more breakers breaker should be suspected if no other cause insert the red RTXB trip-block plug in the is located. If feasible, inrush can be minimized respective test switch positions. Prepare two on the initial energizing by temporanly recan-leads each with a 20 A COMBIFLEX female necting the main transfonner taps to include tenninal crimped to one end. Connect these more turns on the winding to be energized leads from a source of test current t prefer-OuaMonauy h nw N dm.aW to im% g ably an ungrounded sourcel to the respective energize a transformer from a separate, lower positions on the B (left) side of the rear of the v Itage test source. This can elinunate most RTXP 18 test switch. (See Fi'e. 7 in AG for inrush considerations. But it creates a hazard the proper test switch positionst if there is d a rauh shotdd exist in the transformer. there also load current in the relay, the injected test may be insulficient current to operate the pro-current required to cause relay operation may tective relay s and extensive internal damage not relate to any calibration value. However, might result, since the overall trippmg operation is still con-tormed as occuringjust at a relay pickup, the S Load checks: Load cheeks are most consemently purpose of the test is satistied fully, made with at least a 30 C load on the respectise CT's. When this is not feasible eare should be used 6 Set the relay: Ref.er to AG. Testing Section, for pro-to make allowance for CT performance at low cur-cedures for confirming the characteristics of the rents when evaluating results. Also the effect of the relay. There are only two settings to be made: hid burdens oflow current ammeters must be 1a) the minimum pickup current is set by means of Mhed fot The various currents are measured by the selector switch on the fase of the TEE 4 meas-usine an ammeter connected to the RTXM test piue uring unit: tb) the unrestrained instantaneous unit nserted in the RTXP 18 test switch. Refer to de- ' is set by means of the jumpers on the rear of the tail drawings for the proper location of the various TEE 4 unit as shown ' Fig.11 of the AG. currents on the test switch. It is customary to in-sert red, trip-block plug into the RTXP 18 test switch to asoid inadvertent tripping while load 7 Initial energizing of transformers: This should not checking. But this practice must be weighed against be done until after the relay is set and after the trip the hazard of a new piece of equipment faultmg circuit 3 are known to be functioning. With the test without primary protection in service, switch normal so the relay can trip, energize the a) Note that with multirestramt models which associated transfonner from the least critical source. require two test switches, the neutral differen-If the relay operates, locate the fault or the in-tial phase currents have two contacts in paral-adequacy in the relay system before proceeding. If tel, see Fig. 7(dt Thus to measure the differen-no fault is found, a wiring error should be suspected tial currents it is recommended to use two test if the relay had been presiously set correctly. The plugs, one for each test switch. Connect the most likely cause would be a significant error in a test plugs in parallel to an ammeter. Insert the CT ratio such as to cause the unrestrained unit to test piugs to the same position (12,13 or 14) trip on excessive CT secondary current. Minor ratio on the test switches. The ammeter then shows errors or incorrect phasing of auxiliary CT's should the total differential current. If, on the other not cause this type ofincorrect tripping upon hand, only one test plug is available the diffe-energizing without load. rential current can be measured by inserting 4

c r 4 { 6210 Tl the test plug in the test switch 101 and, on the A side of the switch, temporarily open the With the tnps blocked and ammeter plug with connection to tenninal 14 on the test switch meter connected inserted into the differential 501. circuit, conneet the A side t black lead) of a second ammeter plug to the same A side of b) Load Tap Chaneer transformers are usually the differential anuneter plug. Insert this checked out on a mid tap pcsition. But fre. suonJ plug into one of the input ciremts. quentl> the taps are Jeliberately run off nonn. The ddferential anuncter should now reaJ the al to doelop a "circulatmg current" with current whi,h was thus t,ypassed f rom the another transformer for improved metenng rday. Be sure to make the connution be-accuracy. The results are then converted to a t an the two plugs before insertine the neutral position by inversely proportioning suond plug i as id an open C'l condition, the currents to the respective tap voltages. 10 c) When there are three or more winJings, or Repetive energizing of the transfonner to prove sources, they are usually checked out in pairs-no maloperation is not reconunended. When but this is not a requirement-proof of perfonnance is a requirement it is re-commended that an oscillograph be used to re-9 Winng errors: When the differential current of any cord actual current wave shapes. thus nuninuzing ph c is more than a few percent of the input cut-the number of innhh tests wluch must he made. rents there is either a winng error, such as a f.

1. e 11 shift error in the audliary CT's or a ratio error Staged fault tests. This technique of provme no somewhere in the system. Note that the magnetizmg wiring errors or malfunctioning relays is the pero-current in the power transfonner can cause a higher pative of the user. It is not necessary from a relay percentage of differential current if the load current commissioning siewpoint.

is lower than the rated value. The following are some 12 of the more hkely errors. Plaemg in service: After all temporar) startup facilities have been removed it is good practice. a) Same, small differential current in each phase when feasible, to initiate a trippmg from the - a wrong set of CT ratios or pnmary and DSE relay to connnu that the protection has / ) secondary of auxiliary CT's interchanged, or been returned to working order, induding tar-LTC off calculated tap. gets, which should of course then be reset. O b) Differential currents higher than any of the 13 When one or more TUC 4 input-testraint modules restraint currents - reversed auxiliary CT ratio are used, two RTXP 18 test switches are utdized tor combination of e and d below). as shown in Fig. 7 AG. Ilowever, to fully mter-e) Differential currents about equal to restraint lock the decommissiomng of the inppmc with currents - the delta of auxiliary CT's probab-the insertion of a test pluc handle into either ly made up in reverse sequence from the main test switch certain de cireult complexities have power transformer-been introduced. Also as noted m item M above, d) Differential currents V 3 times restraint ton a the differential currents are parallelled in the tw o two winding load test) - a " roll" in the phas-test switches at positions 12,13 and 14 Thus. ing of one set of curren:s. On multiple wind-refer to proper drawing for the specific installa-ing transformers there could be more than one tion detail before load checking. such error. e) Unequal differential currents in the three phases - some type of asymmetrical wiring error. If there is current in two phases only and zero dif ferential in one phase, probably AUXILI ARY CURRENT TRANSFORMERS an interchange of two phases from one source. The vanous methods of connecting auxihary CT'S to 0 No current in a differential circuit - this provide the desired phase shift and zero sequence per-should not be assumed to mean correct wiring, fonnance are given in AG Fig. 9. AppenJix of the DSE AG provides complete information on the there may be a short circuit or an open circuit in the differential circuit. To test for one of SLCE 12 auxiliary CT turns ra:ms and windmg de- 'T these conditions observe the differential cur-velopment. The kneepoint voltage of these au aliary CT's is 0.41 volt per turn. This can be used to son- / rent when one of the restraints is removed Grm the general adequacy of the CT appheation. from the relay. This can be accomplished as esepecially if there are any appreciable lead leneths follows: between the auxiliary CT's and a 5 A rated relay. 5 L

R ASEA RELAY ACCEPTANCE TESTS than of relay perfonnance since each Inp circuit a The acceptance test procedures given in the AG will routed through a separate relay contact. Also, all contirm all of the operating parameters of the DSE rest switch positions are used below their conseru escept 5th hannome restraint. < Tins in treated in a U" f"li"9' separate section of thh Ill Other tests which one 5 Dieleetne Tests.1:ach relay is produs tion tested to may wish to make mtully might me!cJe:i Ref er to tne specitications gnen in the \\G under ratings. i AG Fig. In and ' ter proper ternunals tot the vanous 2.5 k V. 50 lie I nunute for the current arcuit. testst 2 kV for all other arcuns. Field testing to ~5 per.

1. Operatmg time of the NIS 1 Inpring relay and any

'ent of this ulue a pernutted 13 apph,able stan-other tripping or lockout relays. dardi

2. Operating sensitivity of tnpping relay s. and :areets D SWC Iest: The relay has been ty pe tested with the and target reset. Note. The phase operation indi standarJ 2.5 kV l Milz signal with a 3 4 cycles cators are all electronie and their threshold cannot Jecay time. There are no applicable stanJards for be conveniently checked.

a SWC tield test

3. Influence oflevel of de on perfonnance of relay:

DC interrupt test: General prudence sugpst3 that To check for low de soltage connect a 5 K u 5 W no relay be left connected for inppmg when the Jc rheostat between the 125 V and 2:0 V de taps on auxihary soltace n mterrupted or restored. Ilow-the TEE 4 measunng unit Ifor a 1:5 V supplyi eser. the DSE is secure ag.unst suely maloperation Move the 125 V battery supply lead to the 220 y and it may be tested to continn thn wohout g tap. Measure the soltage on the 1 5 V tap and ad. damage to the relay. just the theostat for 100 V. s,. Other tests at time at acceptance or conuniwnmg This is the - 20 ' specification for proper perfonn. For those wishmg to establish bench mark 3 for ance of the relay. Make such perfonnance tests as future reference in case of trouble. see section an desired. Remove rheostat, return battery to proper Voltage Measurements tor suggestiont 125 V tap and recheck relay for proper perfome ance. ( A comparable procedure may be used for other supply soltages). To check performance on high de voltage, increase battery charger input to PERIODIC TESTING raise voltage to 140 V overcharge condition (on Periodic routine testing can confonn to the users 125 V system). Test relay to extent desired. estabhshed practices. There are no unusual require

4. Simultaneous tripping of all breakers: This is more ments. Suggestions as to ty pical practices are gnen m of a test of battery capacity and fusing practises the AG.

&% 3n .y,., 3 sj jl[i a A ; "J A -g-l L gu i; h .c Test switch FM l Phase unit

h N h,. '

1. , i '

i RTXP 18 i e DSE 43 t[N,.t M Us e i, w oc \\ b l i l y e f N l

• 4) 1

__-; p A d. ', /.' ~ .,I rf f R Measunng unit I. Phase Mcator h.$j q I .'I TEE 4 SG t j I ,I. e(j .s m e, ~~I l i I l i g t g -f .a + q Output tnoping relay I m. 26 dst unm gg ) 6

6210 Tl

E

-tf g- ,w k (}% 4 e r' 6 f j = i .(_, i_ _ I,t'E i. i s< 'r - + < ..mm >-----. _ _. _ _ _., + pc , g-s,. .>.c x=>,c=>,. _,__ / _ _ _, / i 4 t,- a 4 = s.c..f. n.-.n.g.,- c-l cm. 4) -_ _ 7 , i, -{ O 2>1 4 j l t ._..t_-_____;.1_~ m. i i a y y e l

c3 c

,4l y p.- =>-, -q .c _w .-9 t k bq 4'j L.+ - , =.>-.-,= = ,u ,, - i" : '" o.3 Y f 4? Z l _e i / s ,s !?$ wL __1- ~1 4 -- L W.,-; i _ j ; i y v f i * (g v' i I i ~ ~ : W c. }g y I i a -q

+

+ 1 , _ _ L. 3I.,;_ __,_:_ ,L ,~...a,, q, gc s i, e.. ,n.,. ..m.... sr a,. t r :.. s. m re.as o rg T' D C. inermnnections betw een anits of DSL linternal relay detadt are on!) shown tunctionaH)) (~' ) DESCRIPTIVE PIIYSICAL DETAIL The AG provides ir, the first 6 illustrations and related euit is only to accellerate the operating speed et fik text a physical description of each unit which makes relay. The restraint unit will always function a tew up a DSE relay and the way the relay is assembled in milliseconds after the instantaneous umt. the CONIBIFLEX equipment frame. The AG also de-scribes the relay on a functional basis with AG Fie.14 \\.ersions without the m. Jicator RXSG l h.n a com-showine in which unit each maior function is located. ponent block type R.fXE with three built-m resntors ~ ~ Figures 26--32 herein show additional detail of each in unted on the rear of the me. unng umt. unit. Note:It is not the intent that this detail be used to facilitate internal repairs to any unit. The purpose When more than three inputs are used, a fUC 4 mput is to make the functional relations shown in AG module is added for each additional input. The con-Fig.14 more meaningful and to make trouble shoot-nections between the RTXP 18 rest switch and the ing between units more readily accomplished, DSE 43's and TUC 4's are shown in Figure i Afore detail is shown of these interconnections in Fig. 29 The TUC 4's are three phase units. The DSE 43's are WIRING INTERCONNECTIONS BETWEEN single phase units with three inputs per phase. Thus SIODULES e,.h TUC 4 connects to all three DSE 43's. Fig. 27 shows the functional purpose of each of the interconnections between the DSE 43's and the TEE 4 l" measuring module. This enlarges on the information ,, 2 a s a given in Fig. 7 and relates the overall operating details 0 l, of Fig.14 to the actual wiring. c i~~A ~~ ~ >l Fig. 28 shows the connections to the SG I, individual N5a U - -- 1 phase target module when this optional component is used. Note that these targets are operated only by the 'h 7, ( ) restrained signal. llowever. they will function when -j w as the instantaneous. unrestrained unit causes the tnp-ping, because the function of this second tnpping cir-I y X DC mterconneens to pha e inaicator SG 1 b

ASEA . ;w,. If 250 V is not available apply the highest available ' 5 0 -,._.. _. _, connected to the proper soltage tap as pisen in l'ig. 27 ~ - _ _ "J3 C ] *_j %- _ ,\\ll soltages below this value should conform to --.m c._., Table 10. .M Note: ~~ This test soltage may he apphed to the R I \\p l' n _.- test switch at positions I s t ~ > and I i-t howeser. _L_. 2 I~' f ; ~*[* be certain the T(( 4 soltape connection is on thL idf- 'b rect tap before energuing. _._m -~ - - TABLE 10 .T _ q.. TEE 4 Posithe DC Voltages Referenced to u__ _._. _ _., c. 3' : TeinM S _w c y 7+~ ~ -- - lerm rul .___.1,,

1. sWh O. :rJ 7 -

-~ 112 250 I14 210 - 225 7, _g 7 -..- - m n -~__e !I6 4,- ,c ~ ~ ;5 311 ~ TZ. -._ _ 37 - 43 42s 29_33 a c-3C1 425 23 - 26 i i ~ 422 17.5 - 19.5 421 11.5 - 13.5 g 2 C i. _ _ _. ~Jtl *; = rN w m mer ema mum, so ineir -m

z f- -. ---

mmra uin he bener nun shn a in the T v+ W m.~ ,gynn Connect the nonnal au.uhary supply soltage to proper r~ tenninals and reconfinn all pertinent voltages in Table 10. Increase the battery soltage to the rateJ 1m 3 hrer mom heten ost 4rs na n c 4s overcharge value. All regulated voltages i.e. tho e at terminal 42S and below should be within the mau-mum values given in Table 10. .\\1inimum pickup reference soltages YOLTAGE ?.lEASURE.NIENTS th rated e Jary vahage apphed to the rela the Auxiliary, reference and signal voltages may be meas-minimum pickup reference voltage on tenninal 143:426 with respect to signal common, ternunal ured and logged for future reference using a 10 ku 143.421 should be according to Table 11. The burden per volt de voltmeter. t See section on Test Instru-ments and Their Use Before Proceeding This is not of the DSE 43's should be in place, i.e. no winng dis. connected. a neeenary part of the commissioning procedures, nor is it necessary for future trouble shooting since the v lues given in this Instruction are adequate for locat-T.\\BLE 11 a me any possible malfunction. Tne relay should be Alinimum Pickup Reference \\ ltage, TEE 4 Terrainal o energued for three to five minutes before measure-143:426 with respect to Signal Common, Terminal ments are taken to allow for minor warm up drift of 143 s21 reculatme circuits. Ttus is not a restriction on placine th' relay"in service, it is only a procedure for assuring e "'n exkup sett:rg wiuge that an accurate set of bench mark reading 3 are Pe u en t musi secured. 20 Auxiliarv 5 oltaves 16-S6 ~ 25 R3 - 10.4 32 Apply 250 V between TEE 4 terminals 225 (- 6 and 11.5 - 12 o 40 112 ( +) and confirm that voltages are according to 14.2 - 15M 50 17.5 _ 19.5 i Table 10. 3 8

02 10 11 i AllLE 12. Ten point salues for itADSE s ofif ut !I L lirmeg I t o 141 \\ P l $ s,h I i p. a) g, D gr 3 J 1 sat im, 1 -cstin c i ':1 1? t s k Jy T la'l 'rf n ral ln it st S i.n s h ( fi l l.' t ; ; 3 g f a ll; DSI 43 at seat lu' Dif f. witage V4 3 anJ 12 1 21s. 421 0$ s5 a5 + 3 23 20 25 3: Pm ent.a reu r.unt VI 3 and I: I 4 : 1, 211 1-2 l 3 s.5 s 10 :' Vanable pen entage V5 3 anJ 1: 1 4 1. 4 o si 4 restramt 3 1 1 liarmome restr.unt V3 3 and I: 1 + 4 21.

5 n

3 3 19 23 Output witage Y' 3 uJ I 1

427, 4:s n- ~

n ~ + 3 6 -- s o s DSE 43 at seat i19 Same as abose 4 and 13 Same a, abose lame as abme DSL 43 at seat 131 Same as abose 5 and 14 Same as abose Same as abme 1LE 4 at seat 143 Stabnaation of au s. s altage 0 + 428 2:4 20 33

• 12 Y supply 0

+ 4:5, 421 11 5 !'5 - 12 Y supply 0 + 4 21. - 2 :4 II ( 5 Minimum pickup reference 0 + 4:6. - 421 I l.3 )i U voltage Voltage to indicator 5 and 14 1 4 226 - 421 l'3 !a Voltage to output relay 5 and 14 1 4 222. - 2:5 laiual to o m,hJ batten.,4it ge sint we,a rma onvena

2) 4.lf a mf ra % it h a siilit?tet e! Ut fm.igity% Dd in fit. highuhfTili i > 10 L Il s I w it h ratra anthath whge unnesicJ to terminah I t + s ana 18 4 i on R ITl' 18 tot w n.h at seat 101 stmenor attent m.k g wirs tor m its b set at.12 pr.cht Differentia Current to Voltaye: Transfer Constant flarmonic Current to Voltage 1

.The ddferential operating circuit can be checked by Tiansfer Characteristics applying ae current to the relay and obsetTing the The 2nd and 5th harmonic current restramts are positive JL signal voltage on the unrestrained instan-mixed together from each phase atter ri.etitieation. taneous signal wire on tenninal 218 on the DSE 43 These hannonie filtt rs are designed with broad ch irac with respect to the signal common, terminal 421. tenstics so that there is a defimte amount of lunda-This is soltage V4 in Table 12. Table 12 includes other mental signal passed through. This fact can be used to data for the complete checking of the DSE 43's and the 1EE 1 test these til ers with fundamental fretriena eunent so as to establish de soltage bench marks for these Restraint Cunent to Voltage: circuits. Table 12 shows the restraint soltage. V3. on Transfer Cfiaractenstic terminal 222 referred to 421 to be e.spected for rated fundamental trequency ac mputs to tenmnah The restraint current functions through a rectuier and on the test switch. a non-hnear circuit so as to proside the variable re-straint charactenstic. A determination of the function-ing of the rectiheation separate from the basic non-Intecrated Output Voltact hnear network is possible by measuring the negative lhe performance of the phase lesel detectors and out-soltage on terminals 211 and 422 with respect to 421 put mtegrating circuitry can be checked h nicasunna of the DSE 43's. T hese values are shown as VI and the DSE output soltage across tenninah 427 and 42x. V5 m Table l' The espected values are shown as V7 m l'at'le 12. o

l ASEA I AllLE 13 Test point salues for itlC 4 (wm ( e = t-0 cm ! I R I \\ P 18 s a' 4 a scat 5 41 imu ];p up.m 611' s't u ut (. 6 J v .1 1.t" al ln

1. 'l t 1 "

l {f,;

1. 1 p1 - _

l l(' 4 at seJt 59" 1*Cf,Cnt ICstraint iUItJee I ! 3 Jihl } I 21' [l) )% ]p 2] I] 3 (5 s ( 10 5 4 and 1: 1

1 s,

y e, t 5 anJ 12 1 417 all I CT 4. t seat 519 l'ercent restraint mitaee VI n and I: I 21' 211 + 3 ~ andI; I 2:1 + i s and 12 1 al' all \\ lLT 4 at seat 431 l'ersent restramt soltare VI 9 and 12 1 21' 21I + 3 22' 2:1 10 and 12 1 t Il and 12 l +4l- -4Il 3 O TEE 4 CAllillLVilON CitrCKS Ihe sienals f rom the DSE 4 s which actisate the [.i. _ ] II,E4 measunng cirsuits can be snnulated with de r r- ~> i soltages to confirm the pertormance of the TEE 4 h-! 'g I~] separate from the DSE 43 units. Note. As described g* -1,y

• pressoasiv, the as tual sienals are untillcred rec tihed li

-a weves, nbdified b) an mteerating circuit with unequal C.' ~ * " - ~ ~ ~,, tharge and discharge tune constants. Ihus ora should H. - - - ~ ~ - not expect to lind a direct relationship between the L de signals trom the DSE 43's as measured and the per- ,, yo o y y na,,,, w, n m, m.,,.,,,,-,, :, o i r,a turmance of the Tl:E 4 as deternuned froin the follow-wra :na Jm ur in 1114 mg de stenal testt lloweser, for deselopine bench marks. these are good tests and ot'servations for con-firming the proper performanse of the relay. I Alill: 14 llestrained Sienal Lesel Detector DC Calibration Check of 11:E 4 Itesirais.ed Signal. l'ickup and Dropout negalist Voltages on terminal A negatise going signal from the quiescent state on 143:423 with respect to 443:422 the 1 EE 4 signal ternunal 423 will cause relay opera-tion. With no ac into the relay the soltage on 423 1% ku p t h0- 6.l V plus the percentage Jes talmn ,hould I.e 6 7 Y negatise with respect to 422. of soltage on 422 tram the 1 A5 Y nonu-To establish a more negatise signal so as to cause nal s alue operation, fie 30 shows how to do this by connect-s I.40te: Ihe obseru J soltage will drop mg a potentiometer between 224 and 4 2 with the about 0 s \\. when the tclay operat - Jue shder going to 4.,.3. Monitor the output contacts of to desnned arcun interactiont the reed relay by means of a smallindicating lamp, Resistor salues are not entical The relay should oper. Dropout i>4)Y ate per Table 14. 10

62 10 11 y L. - -., ___~,p l% 3-4>, g.. 7

n. -

i., . } }.* i + ~_ 4 i r j L_ -- r.__,. m m - .q,A... A _ .i it i +' l 'y.I l {} ( G N k 41" a.J f! It f.f th f' k f P $. A. I' fJ'u D .l alm 4 8 f aiN ' k :g s' } g', ' O g s 'd. d j 91 {s ', ,rg !<r h I ' ' I 19 $ d " 4. 'jf Eyl lf) f N, ! ' f I '4 r Unrestrained Signal lesel Detector .lhe target in the Il 14.s energueJ through an \\15 l ~ A positive going signal froir the quiescent stato n the output relay contact f rom a regulateJ dc turch a4th. ITE 4 signal terimnab 41' or 427 will cau' rel.a in the llE 4. l~o che,L f or its margin of ol'eration operation. With no ac surrent mto the relay the soll- 'onnnt a 10 Ku sandle resntor hetwun il! 4 age on 417 Jnd 427 should be a sinall positisc vahle terminalh 143:22h and 425. and obserse the soltage with respect to 421. To establish a more positne Jeron the target sin) when it operates b mecanng signal so as to cause relay operation. connect a san. acro % !

2

1. T he elNthcd txt can be abl0 lesntor hetw een terminali 143,417 and )43-22]

• UUI13IW 'bhkCd bI 'UIIdb!C UUCIYIUU2 AIN IC UW" I~

of the IEE 4. Details are show n in Fig. 31. The relay should operate per Table 15 The mJtvidual phase indicators w hen uscJ. an be Note: Add a 20 - 120 V dry battery m senes t.3 checked with the circuit.how n m Iig M Howeser needed with the adtustable resntor 11 soltan on m place of c nnecting the test voltage anJ se!! meter 143221 is msufficlent to Jeselop adequate bias on ed onto ternunal 4.).6 of each of the Inl 4.; p on tenninal 143 42 of the 11 L 4, thes are,, o eci. i a j 7 a j g. units in turn. They should turn on at a whage a,ow n TABLE 15 in the Table 14 for the restrained signal operatuu threshold. DC Calibration Check of TEE 4 Unrestrained Signal. Pickup and Dropout positise Voltages on terminal 143.417 427 with respect to 143:421 ss ume 8 s i' 13 s h 20 x 3' INkup, 60 llt '0-100 140-170 215-265 50 Hz so-100 135-165 .'10 -- 2 b0 Dr-poui Just below rwkup l a k s witant a w ith. onnecnons to both 417.ina 42 7 i l 't 13 s,c:tmg tt with wnstions enh to 417 n :a s wrnn, n n e annn non, oni, o 42: i5cc i or II m sGl Output Rela), Target and l'hase Indicator The MS 1 output relay should be energued with what-eser auxiliary voltage n connuted to terminal 221 when the TEE 4 reed relay operates. To cheek its pick, up margin conneet a 10 Ku vanable resistor between T EE 4 tenninals 143:221-222 and obserse the volt-age across tenninals 155:11-12 of the MS 1 tor 143:222-225 of the TEE 4) when the MS 1 operates. The MS 1 operating time can aho be checked by short-l ) ing acro 3s 143:221-222 to energize the relay at full voltage. 1i

ASEA OVI.it A L L l'l.~ lll Olt M A NCI: 11 Sl S I A Bl.1 1 g lhe.urt.nhe tests outhned in the \\G pages 23 to ~1o be used with figure Iti and Figures 7 hii and i n W i[er s am einen c i vtbim the b.nn of the m er.dl perhirnuns le t' 2 lest of DSl! with liu input testraints Itwo 10( 4's ' n mJ l d a i.mJ l aHrs. t 1- .md two or three test switcheu 3 a n d (1 s h i u t h.' J c t a il s 1 s,in ne, t i..t s t < i " e 1,i J e l f ut ;Jnotn tests are icpcated hele L 'NI '"ut h aJ \\ - h a.1 8 t. naa (.. w i,, o o s lot t l'i ct 6 tm ml i rm ina] a rmr al n n. 4 om.u, e i d..a it d i 12 TABLE 2 h s 4.' i>4t,t> it i .l.e be med w h;t I,..gu r. 1, g u re, i.i > I ! + 11. 51. 4 >

4

.i Test of basic DSE with three input restraints

hJ p

3 a ( 1[ q, j; l no m e m, s 4,' ui41. t, 13 4 Connnt Conne.t C or nec' intramt 1 5 44 It $t,st, it i icaJ A ta itaJ h to aci.J ( to %1 u e % Intof Phoc termnal terrmnal ternurtal in emition eg,gg n. p 3 4 g; fault 1 3L 12 Optratmg R 3496 12 0 rc%ni 6L 3 i; salue 4t'.106 13 n s 4 1 $tN.116 14 0 gi to 4t i) 2nd R 346.9. 12 1 .L 4 13 ) 7 3 u hat mo m. s 4 a ni 13 1 11 51 14 2 r ci t t.un t i 5 e k.1 l ) 14 1 q 3 ja Dir 0 Li'h-R 3 L i2 2 %,te 3, (a m ne,i,om an.w t t o terminah w it hin t i are. I't > .el f e r 1 -a c buit 1 9 12 2 ,umplete test a ite rein mpui t u.um entramt S 4 l.1 2 Note 2: L sta.h b. serman.in on the w - nd tN w it.h - 'l l - N 4 IU I3 2 n hm er lef t of the As augment f rame. I 5 it 14 2 5 11 14 2 TABLE 5 % ire:connecnons am n u ictmmak u oh n i i se opnonal tor a nrre i ampicie int of the te:n mrui ar.ua .l~o be used with Figure 16 and Figure 7 idi and i ti Test of DSE with sis input restraints (three TUC 4's and two or three test switcheo 7 'g 3 ( o n e. t t onne. i t +nne. icad s w im a m e J c s '.o ~ o s To be used with Figure 16 and Figures 7 (d) and (e) Id of N"" """"di '"""*2 ' c "'"r d' "N"" Test of DSE with four input restraints (one TUC 4 orerants a 3 46 utatati i: and two test switches) utse s 4 t '.10, 41. ' t, 13 o 10Ls Unnect conne. : connect T 5 1 11,5t,Mt. 14

• i leaJ s to lead b to lead C 10 Set suit.h 5 liti int of N:er tenmnal is tminal ictrn tna) m posinun 2nd R

3 A 9.Jt.6L,91# 12 I opera ur's R 3 io. ( 311 12 0 t armonw s Ji?.10.4L,'L, 13 I ulu e 5 4i'.lo.4La 13 0 rniramt lot # 1 5tN.11.511 14 0 1 3,si,il,$t,yt, la i 2 l R 316. 4, R i i2 1

jg, re mume s

4 A l o 41 i 13 I p3,o u g h. R 3 6 12 2 reuramt i 5 A i 1, $ 1 ) 14 I .,, g, 9 3t g; rnuaint 6L 91 12 T houg h-R ) 6 12 2 s 4 33 ladt 9 R 12 2 10 4L 13 2 rntraint 4 ? 13 2 t pit 13 10 4L 13 2 7 3 g ja y T 5 S 14 2 ii 3t ja 11 5L I4 2 y ttt g4 Wie 1: Conneetom shown to termmah w atin ( > are opuanal for 4 more complete test of the relJ) mput ciriulti. Nme 1: Cont ecnons aew n m termmah withm t i are ornanal DmpiVte test of the relJ) mput $1rsulh. Note 2; L stands foi termm.th on the seconJ 'est sa te' t$01)in the in er lef t of the 85 squipment f rame, %te 2: L stands Ier ternenah on the econd int sw n.h iSolI n t* e bw er icit of the B5 equirment f rame

6210 Il NA Q g> 9 ~7 ~~"~ t :,,3,-g l l :ne>-(D t7 ( !4 :1 ~1 l _q 7 I i'Kl l;m I q* g* I PS -R*f y m I!., 34 > Pi l ; 5 e4 1,M +A W l L I est; (,,4 y Y 3 p l #p l s, F. H. j[ g I f [ (Y) ] W

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i m, 1 l'a h 'a'e; 5: '+ " l

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f 1 O l (A) B g g l' 4, (}A h

h, La i h0 d$i-I j

q __.y_ r l 1 m et.c n ) y m L-j, l.revvs , %, d 6 H' $.-. M 'aC S4. 1 I i n I g 1 *. is s c jh I !s .x V' ..) i 111 L ,v i n, n ,";; f }T ' T~TTT!,lil4 c+ p p a an; ; ; n h O ca[ 6'1 +C Q ,y-1:3 e hi - - j m i ) y qfr ) bcd gb irx ! *, T 'C' lN j l l' 7 ~ 5-H h .D } h].1- 'l e-~**^ mY te.-. wer-i L i A i L-Jj M 0lr -J + T5 g rap +ci cor ep en 'e te mee at t re e' 'ev y %te 11 Refer to l'igote ? del ror mterful connections 4 hen four inputt are useJ, and to Iigure 1 m when the or m mp\\ll la test handle uts are used N %*. 2.Cor.nect test leads A. li and C to the R I auoraing to the sheJules in laHes 2. 3. 4 er 3 If ' N " I1*4 Ue'a' " 'df;'u 'c e ::' *g c ^ il fe e e' t.r g gi l ig i f> Test set up for chedtne DSL operatirg sharacte.nties se wept $ th birrnOrili re5traint l. Fundamental Frequency Tests

a. Alinimum pickup currents

b. Restraint characteristics With the selector switch in the mid (0) position With the selector switch t Figure 101 m poution 2 (Figure 161. the minimum pickup currents and the the restraint characteristics can be determined the un restrained operating currents can be detennined.

operating raiues should be within 10 percent ot the The settings should be within 10 percent of the eunes of Figure 13 ial or ibl. For conunience calibrated value, lo eliminate any ambiguity as to these values. witn their accuracy knuts at an am. which umt is operating, the restrained unit can be bient temperature of 20 -2PC, are tabulated in temporanly disabled by opening the connection to table 6. ternunal 143:423 of the T EE 4 measunng unit. See Figure 17 for the physicallocation of this Obsene that the un restramed umt has to be con-neeted for an operating ulue higher than the h 'h-terminal. The extractor type RTXD provided for est ulue of 11, in table 6. 4 this purpose should always be used. Never attempt to remove a leadwithout the extractor. This means that ternunal 143 A 17 must not be N Note: The output relay will nonnally pulsate when connected to 143 A27 as at the setting S tuna uted j the unrestrained circuit is tested, llow eser, the current. time in the first picked up position is long enough to trip a breaker when the relay is in senice. 13 (

AOEA TAllLE 6 5th flarmnnic itestraint Tests Variable Restraint Test Data at 32 9 Min. Op. Current A different test setup n rmbd to sheck the 5th 1itu h lo The 2 rid harmonie restraint characteristie can be percent wdl sause onh a percent ef fect on the mn checked with the circuit of Figure 16 by plaeme the salue of Ow resolung w.nci } selector switch to position 1. The single diode recti-I h " d " '!" * ' i ' ' " """ " " ! t h e h " "" " 2 ' " " ' " ' Oer provides a eurtent wase shape neh in 2nd har- "* "I N"' h# $"I'3bl# f"' ' hv l'#4"'"O *"h #d monies in addition to the de component. By adjust, Re dua) bqun Whwpe n an meNnt meduM ing the two load boxes, various proportions of 2nd for sonh,mung diat the two ugnah ae not intenenn; harmonie to fundamental can be established. Wave wuh each othm and of equal unponanm that A shape analysis shows that if the ac current 1 s read '""

• C I C' $ "" "' ' d' ' P' PC 'O ' " d N" "" E U " '# *
• 1 on an ae ammeter and the de current 12 is read on a

" # '" "0 " I ' de ammeter of moving coil type (neither of rectifier type t lhe relay should not operate when 15 at smple phne tests is more than 35 -45 percent of 11 I he rela:. Of12 percent 2nd harmonic = x100 shouid be set on the 32 percent minimuni operatnu eurtent tap to dupheate the factory eahbrahon T " comenient method to check thn b to appl > 13 A of 5th The 2nd harmome restnint has a 20 percent nominal harmonic < tot a 5 A rated relay) anJ to then m-value. A comenient check point is to adjust the de erease I) until the rein operates, which should be at 3.3 A, 4-1 A - 0 A. The tonnula is: current to 4 A and with the minimum pick up setting at 32 percent, gradually increase the ac current until 13 15 the relay operates. For the 1w25 percent factory ! operate

• OT' ' i" 0'3~;

calibration this should be at 3.1-6 A ac. The mmi-mum pickup sensitivity setting has little effect en this 2nd harmonic restramt characteristic. The de component of the 2nd hannonic test current Indicator Tests will now not anh m the relay (and cause no ugnifi-cant effect because of the air capped transformers), Check that the indicator Dag in the TEL 4 unit drops but it will also flow in the supIrly circuit. This may when On relay perates and that the indicator Dag cause de saturation in the supply transformer and re-resets when 110-220 V de is connected to tenninah sult in tuse blowing. More importantly it may result 41o( ) and 41i H in the TEE 4 unit. in test voltage distortion which may affect the relay characteristics without the tester being aware ofit reemhaw hsts other than by observing a relay with apparent lack of sensitivity. Should such be the case, one solution is to The complexity of thice phase testing is not usually supply the rectifier circuit from a separate ac source. warranted. If a three phase, fundamental freeueney Another solution is to add a 2nd rectiner and dummy test is made with a pure sine wave, the minimum psk-load to cancel the testing de in the power source. This up current will be increased from the calibration value by a facto; of 1.4 to 2.0. This is inherent in the reby is also shown in the test circuit of Figure 16. design and is not adjustable. 14

1 60 10 11 5'F? t 0.47l, .'Ti _ -. g 100 ,a 40 @ p 4p, li m3 0 O 2 2 2 - -- -- - ,C CQ

• p gg and will at tius test normalls be := h pct,entave points lower than at the.nd hannome restra.1 D,C D

D DC S Stose test lead from 13 to 14 and jumper from 4 to 1 5 O kh 5 to check mter action between 10 and RO. To D,C Q,C d. Q,0 sheek the inter action between 10 and 50 mese d"p A D,a d"p A Dp' the tesi ieaa A rrom tenninam ROno a ISO, ana lead C from 12 RO) to 13 (SO, O Note: T!us inter phase hannonic relatmn does not m-volve the fundamental frequency restraints hence a ,b,C - D,C b,,0 h, total of three tests will completely chet k this feature d.h A Op d,lQ Dp regardless M the number M restraintt u3 DQ DQ QQ DQ G3 Pb CAllllRNilON

1. 'l N

U Q D .q ~%g g g g If any of the restraint characterntics appear to be all, G N calibration, internal relay adjustments are not resom-b.. h mended. .h h llowever, before judging that a relay is of f eahr ration confirm that the test cuttent is a good sine wave. A e Seat 4 Sect 3 small amount of hannonies in the test sunent can be a signilleant ef fcL t on the relJy operating s hara.te-I ng 17 !al 1114 t143) menorms unit. rear ww show mg kwatwn or rntles. termmah used or opened aurms ccitam tests g. the noted range of performance.11 is recommenJed to replace the umt and return the defective umt to the Inter phase Tests factory. The reason for this policy a that resalibratmn To check for the inter-phase action of the hamionic e uld inask a panial {ailure of unne other emnponent restraint it will be necessary to inject the 2nd harmo-and result in the SWL or the oserall performance be-nie into one phase unit and the operating fundamental ing at variance with publistied charactensties. Thn frequency into another. pohey aho auures against inadsettent maladiustment of a relay due to nonsmusoidal test currents. To check the inter action between S and R phase units When a module is replaced with one known to be m proceed as follows: good working condition. it is not necessary to repeat

1. Remove the test lead from ammeter 12 to C. at C.

all of the cabbration theeks. Obviously it is good

2. Connect this ammeter lead from 12 to tenninal 13.

practice to make sufficient tests to.nsure that all of (S 0) the wiring has been properly replaced.

3. Conneet a jumper from terminal 4 to 3,(S O to R On

4. Connect test lead A to tenmnal 3,(R 0)

SERVICING ELECTRostLCllANICAL N10DUt l's

5. Conneet test lead C to tenninal 12,(R 01 The electromechanical modules may be serwhed by

6. Place switch S in position 1.

refernng to the manuals on the speenfie components-

7. Adjust the d.c. eurrent 12 to s A tfor a 5 A relay)

Reed Relays RK :)- 10 E and with the minimum pick up setting at 32 percent. Operation Indicator RK P-1 E gradually increase the a.e. eurrent Il until the relay Nis 1 Output Tnpring Relay RK 21 - 101; operates. The fundamental eurtent needed ter CONIBITEST Test System 92-11 AG operation will at thn interphase test be proportion-ally ht -r than at the normal :nd harmonie re-The reed relay contact assembly can be rep! Aed wtth-str.unt test. as m this case, it does not flow any out disturbing the actuating coil. nd harmonie component in the operating circuit. The operation indicator in the 1EE 4 umt is sinular The percentage 2nd hannome is in this ease equal to to the four units assembled as an RNSP 1, 15

ASEA j liie SG 1 mdindual phase targets are 100 percent ( static if a mallunction deselops repl. ice the entue i module and return d 'tes tae moJule to factor). hie; if tlle SG I n tenlosed, f ull operatiOH of the [ rela) will continue !! the 3 MSI. 43 ternunals 107. I19 i and 131.425 are jinnpeied directis to the il I. 4 ter-l moul 143 423 1 En M m.i m t.u n < ;'. to p,usuit j signal.vntinuits. i s 11tOUllLE SilOOllNG The cause of susre ted maloperation can be identi-l tied by checking the sanous solt.iges as given in the previous sections on soltage meeurements and ILL 4 l iahbrallon checks. A Jefectise unit cari ilso be located by evaluating the basic test data For example, it all three phases are olf eahbration the trou!'le a m the l common TEL 4. or a ground on one of the output ) i circuits of a DSL 43 whith is interactmg into each of l the three phase unito 11 only one DSL 43 phase unit I n of f eahbration, the trouble is most hkely in that urut. Similari). the relatne cahbrations between the j restrained anJ unrestrained lunctions can be a clue as 1 to source of trouble. j When any in'erconnection winng between umts is j hf ted while searching tot the ma!! unction. a minor 4 change can be espected in the various soltages with some reaction on actual cahbrations. These ef fects sholild not be ConflKed with the effect of an actual j defective component. Similar modules may I e mterchanged and modules replaced with new modules without causing the oser-all relav Jahbrations to exceed the specified Ihnits. This sugge>ts module substitutions as an effectise { inethod of trouble shooting. Iloweser, this should not he undertaken before contirming that all soltages are within range on the mter modules wiring shown in Fig. 27. ACCESSORIES AND SPARE PARTS 1 RTNil 18 Test plug hanale and test leads 2 Ammeter test plugs RINM Tnp block plugs RlNil See C l1 51 An adequate spare parts list consists of: 1 RND5E 43 1 RNTEE 4 1 RXMSI gl6 > ~.y - s. ma i e .}}