ML20078D695
| ML20078D695 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/12/1995 |
| From: | James Kim, Mosley K SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML20078D676 | List: |
| References | |
| E4C-098, E4C-098-R00, E4C-98, E4C-98-R, NUDOCS 9501300172 | |
| Download: ML20078D695 (229) | |
Text
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CALC.NO. PAGE TOTAL NO. 0F Southern Cattfornia Edison Company E4C 098 ICCN NO./
1 PAGES PREUM. CCN NO. C.7 /D BASE CALC. REV. UNIT CCN CONVERSf0N : CALC.REV.
INTERIM CALCULATION 2 CCN NO. CCN-CHANGE NOTICE (ICCN)/
CALCULATION CHANGE CALCULATION
SUBJECT:
4KV SWGR PROTECTIVE RELAY SETTING CALCULATION i NORCE (CCN)
! COVER PAGE ENGINEERING SYSTEM NUMBER / PRIMARY STATION SYSTEM DESIGNATOR Q-CLAS S CALCULATION CROSS-INDEX 1804 / PBA/PBS NewfUpdated index included l CONTROLLED PROGRAM OR PROGRAM / DATABASE NAME (S) VERSION / RELEASE NO (S) !
f ExhtN M n h @ te DATABASE ACCORDING TO ALSO, LISTED BELOW l SO123 XXIV 6.1 1.BRIEF DESCRIPTION OF ICCN / CCN: DATA BASE
] PROGRAM UNIT 2 ONLY THIS ICCN VOIDS PREVIOUSLY ISSUED ICCN C-5 A00 stat models E7012PKL (162D), k *)12PB (162T), and E7012PC (162A) are used in the SDVS and DGVSS protection schemes. This ICCN adds a design margin to the manufacturers specification of 10% for accuracy /repe.atability tolerance. The design margin est^blishes circuit operability.
INITIATING DOCUMENT (DCP, FCN, OTHER) MMP 2/3-2060.00SE REV. 0
- 2. OTHER AFFECTED DOCUMENTS (CHECK AS APPLICABLE FOR CCN ONLY):
O YES Q NO OTHER AFFECTED DOCUMENTS EXIST AND ARE IDEldTIFIED ON ATTACHED FORM 26 503.
- 3. APPROVAL : DISCIPLINE / ESC : ELECTRICAL K. MOSLEY b _ /* /> 'I A# I!/M9(
ORIGINATOR (Pnrt name/irgtmVdate) GS (Signat@.e) OTHER (Sgnefwe/aate)~ l J.KIM !<3(!/-(),-9 C M dhM&h /[/3f9[
( IRE (Prirt narhe/irstiatdate) DM'(Sgnature/date) OTHER (Signetwe/aste)
- 4. ASSIGNED SUPPLEMENT ALPHA DESIGNATOR :
CONVERSION TO CCN DATE 9501300172 950118 PDR ADDCK 05000361 P POR SCE CDM - SONGS SCE 26-131 REV. O EL94 (
REFERENCE:
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. .2 NES&l. DEPARTMENT 5"Ec'cNNo.C-7 = 3 0, it CALCULATION SHEET ccN cow,1racN con No. CCN - -
Pr: Ject or DCS/MMP USTTs 2 at 3 Cale No. E4C-098. REV. O
' Sheet No.
Subject 4KV SwiTGGEAR PROTECT"iVE REL4Y SETTTNG CALCULA.7709 otutuTost raft far t.at t l Nstutet mir nt u arY atY .
Min / p. sN 08/1i/s3 a. emb5Ir., ce/13/ss t THIS'BEFCSC lS THE %FT5R., 0 F I CC M C-ly R%
3 2.1.2.2 Timbg relays 162D.1,162D.2,162D.3, & 162D-4 (refer to para.8.53) 120 seconds e 10% (12 seccads) ,
Time delay settbg:
Shee the Sustabed Degnded Voltage Signal (SDVS) wG Se used for protection of the permanently connected Class 1Eloads f om sustained degraded voltage, this h _
timing relay may be set to operate after the automatic !oad sequenebg operations ate comp!cted. .
A t!=e delay of 120 seconds I's chosen sbee the automatic load sequencing The 27N relay in .
opentions sm take 114 seconds (reference 6.16) o complete.
conjunction with this timbg relay wG generate a sustained depaded voltage signal 6120 seconds aher a degnded voltage condition occurs. The 27N relay may not .
protect the motors from this short time depaded voltage conditions.
I However, the cestbg CV.2 rela)s will protect motets from a deraded voltage as shewh in pararaph 8.5.3.2. Therefore, this time delay meets acceptance criterion IJ.J.3.
2.1.23' Tim!:g Rela)s 162T 1,162T.2,162T-3, & 162T-4 (rcrer o para. 5.6) .
Time delay setting: 1.5 seccads c'10% (0.15 second)
A time delay of 1.5 seconds is chosen to disable the degraded volute detection
. ; dreu!! before the start of the second automatic load sequenchg, since the DGVSS should be genented during the fint automatic !c,ad sequencing, and to preside a window of sut5cient duration so that if tbc voltage at the bus drops below the 127D relay setpoint up to 1 second prior to the start of the voltage detection
^window (4.11 serends) as 2.0 seconds delay is prervided for 127D relay to establish
's depaded voltage condition before voltage detection window closes (refer to panpaph 5.6).
2.1.2.4 . Alarm Rela)s 162A Time delay settleg: 5 seconds 10% (0.5 second)
Timbg of 5 seconds
- as selected tp prcnide af arm within a total of approximately 7 seconds ( 5 senonds for 162A 3 2 scends for 127D.1,2,3, & 4).
. : i 513 CV.2 Refa's) 127F.3,127F.2,127F.3, & 127F-4 (refer to para. 8.4) '
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Cy.2, relay with 105 V tap and time dial # 1 *G operate with5 5 sezon
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i NES&L DEPARTMENT ""
CALCULATION SHEET EEu CCuNO. C ~1 me q 0, wo CCN CONVERSION Project or DCP/MMP UNITS 2 & 3 Calc No. E4C-098 CCN NO. CCN -
f Subject 4KV S%7TCHGEAR PROTECTTVE RELAY SE1 TING CALCUIATION Sheet No.
krV ORIGINATOR DATE IRE DATE REV ORIGINATOR Daft IRE Daft Kim Mosley 2.1.2.2 Timing relays 162D-1,162D-2,162D 3, & 162D-4 (refer to para.8.53)
Time delay setting: 110 seconds 10%* (1L seconds)
- Note: The allowable design limit for etreult operability is 110 sec i 20% (22 see) i Since the Sustained Degraded Voltage Signal (SDVS) will be used for protection of the permanently connected Class IE loads from sustained degraded voltage, this timing relay may be set to operate after critical automatic load sequencing operations are completed.
A time delay of 110 seconds is chosen since the automatic load sequencing operations will take 40 seconds (references 6.18 and 6.28) to complete and the setting is within the established upper limit of 140 seconds (see 8.53.2). As stated in section 8.53.2, the 27N relay in conjunction with this timing relay may generate a sustained degraded voltage signal at a maximum time of 134.2 seconds after a degraded voltage condition occurs. The 27N relay may not protect the motors from this short time degraded voltage condition.
However, the existing CV-2 relays will protect motors from a degraded voltage as ;
shown in paragraph 8.5.3.2. Therefore, this time delay meets acceptance criterion 13.13.
2.1.23 Timing Relays 162T-1,162T-2,162T 3, & 162T-4 (refer to para. 5.6)
Time delay setting: 1.25 seconds 10%* (0.125 second)
- Note: The allowable design limit for circuit operability is 1.25 see a 30% (0.40 see)
A time delay of 1.25 seconds is chosen to close the degraded voltage detection l circuit before the start of the second automatic load sequencing. The earliest the j window will close is 4.% seconds and the latest the window will close is 6.14 !
seconds. A 2.0 second delay is provided for the 127D relay to establish a degraded voltage condition before the voltage detection window closes (refer to paragraph 5.6).
2.1.2.4 Alarm Relays 162A (refer to para. 4.10)
Time delay setting: 5 seconds 10%* (0.5 second)
- Note: The allowable design limit for circuit operability is 5 see i 20% (1 see)
Timing of 5 seconds was selected to provide alarm within a total of approximately 7 seconds ( 5 seconds for 162A + 2 seconds for 127D-1,2,3, & 4).
2.1.3 CV-2 Relays 127F-1,127F-2,127F-3, & 127F-4 (refer to para. 8.4)
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Voltage setting: 105 V 33 %
Time dial: # 1 with operating time tolerance of 5%
sCE 26426 NEW 4%
NES&l. DEPARTMENT ""
!stu E N No. C r ' , soy 5 o, y CALCULATION SHEET ccN COWER $CN ccN No. CCN - . I l ojeet or DCPMMP _ UNITS 2 & 3 Cate No. E4C-098, REV. O Sheet No.
Subj3ct 4KV 5%HGGEAR PROTECTIVE RELAY SETTNG CAlfULATION an sustuta kir . Dr NTE }try entsrutDR uit rat uit l
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motor nted voltage at 4.16 XV bus and at a voltage corresponding to 75% of 460 V rated motor voltage at 4&3 V bus. De rehy operating time of 5 semnd at 75% of rated motor voltage meets acczpunce criterion IJ.21.
11oss Tids relay with 105 V ta'p and time dia] # 1 mill operate in 1 second folicming .'
- of voltage. This rejay operating time of 1 second meets acceptance criterion 1.3.2.2.
2.2 Recocumendations 2.2.1 *De follosing rehy settings a.re reco= mended: .
Setting Tolersnee Reharks .
L Reiny I 21.!!% (1.35 V) Relay sith 27N rejay Reset (pickup) - 121.40V
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Dropout - 120.80 V (99.5% of reset) 21.11% (135 V) hs
. (127D !,127D.2, 127D 3, & 127D-4) TI:ce delay - 2 scends 10% (0.2 sec.) .
CV.2 relay Voltage tap - 105 V 3.3% (3.465 V)
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(127F.3,127F.2,
- 5 %-
127F.3, & 127F 4) Time dfal - # 1 4.5%
TIndng relay .
Time delay 4.3 seconds (0.19 semnd)
(1625-1,162S 2, , .
162S.3, & 1625 4) 1 10 %
Timing relay y (12 spads)
(162D 1,162D.2, Time delay - 120 semnds j 162D.3, & 162D-4) .,
2 10 % ,
Timing relay. .
71rne delay - 1.5 seends (0.15 second)
(162T.1,162T.2, 1627 3, & 162T 4)
Time delay - 5 seconds e 10% ;
- TIndeg relay .
162A (0.5 scend)
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ScE as-4as NEW 4'50
NES&L DEPARTMENT ICCN NOJ CALCULATION SHEET eaEuu CCN NO. 61 PAGE b OF b CCM CONVERSION Project or DCP/MMP UNTTS 2 & 3 Calc No. E4C 098 CCN NO. CCN -
k Subject 4KV S%7TCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No.
Irv MIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE Daft Kim Mosley motor rated voltage at 4.16 KV bus and at a voltage carresponding to 75% of 460 V rated
// vd motor voltage at 480 V bus. He relay operating time of 5 second at 75% of rated motor voltage meets acceptance criterion 1.3.2.1.
This relay with 105 V tap and time dial # 1 will operate in I second following a total loss of voltage. This relay operating time of I second meets acceptance criterion 1.3.2.2.
2.2 Recommendations 2.2.1 The following relay settings are recommended:
Relay Setting Tolerance Remarks 27N relay Reset (pickup) - 121.40V 21.11% (1.35 V) Relay with (127D-1,127D-2, Dropout - 120.80 V (99.5% of reset) 1.11% (1.35 V) 127D-3, & 127D-4) Time delay - 2 seconds 10% (0.2 sec.)
CV-2 relay Voltage tap - 105 V 3.3% (3.465 V)
(127F 1,127F 2, 127F-3, & 127F-4) Time dial # 1 5%
Timing relay 4.5%
(162S-1, 162S-2, Time delay - 4.3 seconds (0.19 second) 162S 3, & 162S-4)
Timing relay 10 %
(162D-1,162D-2, Time delay - 110 seconds (1i seconds) 162D-3, & 162D-4)
Timing relay 2 10 %
(162T 1,162T 2, Time delay - 1.25 seconds (0.125 second) 162T 3, & 162T-4)
Timing relay Time delay - 5 seconds 10 %
162A (0.5 second)
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SCE 2f426 NEW 4,90 ,
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NES&t. DEPARTMENT CALCULATION SHEET 2"uUcuo. O'T %m CCN CoWEEoN f ccN No. CCN - .
rejeet or DCJt/MMP Ub77S 2 & 3 Calc No. E4C.098. RIV. O
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The thne delay setthy of the DGVSS timbg relays 162S.1,162S.2,162S 3,162S-4,16271,162T.
2,162T.3,162T-4 are seleaed to comply Mth the above consideration due to the tolerances associated with these ti= cts, sequencing timing re! )s, and the response time of the 1,27D.1,177D.2, 127D 3,127D-4 re!*)s.
e Thning retz)s 162S.! ,1625 2,162S.3, & le2S-4 Load poup 2 starts at 5 seconds. Sequencing uses agtstat relays with 0.5 seconds 1olerance. .
As such 162S timEg should not exceed 4.5 seconds. The AB3 62T reley'has a 4.5%
to!crance as such use a relay settbg of 4.3 sceends. With this setting a DGVSS stdow eculd .
open earliest at 4.11 seconds and latest at 4.49 seconds to allow generation of DGVSS if 127D relay per=fu., This time delay satis 5cs PSB.1 pangsph B.1(b)(1) as disc:.:.ued in pangaph 4.12.
- e. Timing re! )s 162T.! ,5627 2,1627 3, & 1627-4 l
The purpose of this timer is to disable this voltage detection circuit before the start of the g
lead poup 2. However this reust also provide a sindow of sufficient duratioh so that if the voltage at the bus drops below the 127D relay setpoint up to I second prior to the stan of the voltage detection sindew (4.11 seconds) as 2.0 seccads 10% delayis preside 4 for 127D , ,
relay to establish a dernded voltage condition before voltage detection shdow closes. A delay setting of 1.5 seconds is ebosen for the closure of this wbdow so that it is not afected by the se:cnd load potp load stanIng innsients. The time delay telennte is e 0.15 second.
. With this delay in opening the earliest the Medow could close in SA6 seconds (4.11 seconds
+ 1.5 seconds . 0.15 seconds = 5.46 seconds) and tbc latest the window eculd close in 6.14
' seconds (4.49 seconds + 1.5 seconds + 0.15 seecads = 6.14 seconds).
This setting of tbc DGVSS sbdow frorn 4.11 seconds to 6.14 seecnds M11 detect degraded
- voltage in the fint lead poup sequence and will not be 1Ee ted by the subsequent load poup ESF load staning transients. -
r e Alarm Re! )s 162A .
. Timing of 5 seconds sas seiemed to picnide alarm within a total of approximately 7 seconds
( 5 seconds for 162A + 2 seconds for 127D.1,2,3, & 4).
NOTE: DGVSS trips 4.16kV Cass 1E source breal:crs. Since the !stest a DGVSS bus trip may be initiated at 6.14 seconds from the initiation of an SIAS all ESF loads shall be azafyzed for operation sith a'd'epsded voltage condition upto 6.14 seconds.
t 5.7 Calculation E4C 0821CCN C.7 (reference 6.3) identlSed that due to the time deja)s of timing '
' rela')s and 27N re! )s, genention of the DGVSS could be delayed for up to 6.14 seconds, therefore,
- ) c.','the mini: um post trip transient SWYD volute of 2C0 KV could supply power to the 4.16 X T. C15s* 1Eandbuses folloshg a majorJoad disturbance insith tbcthis pid (referpostto paragraph 4.1). Moi (t=01econd) the sexced (t=5 seconds) poups x: y start minimum trip
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CALCULATION SHEET meuu.ccNNo. Cfl noea0%
ccN CONVERSION CCN NO. CCN -
Pr:J:ct er DCP/MMP UNITS 2 & 3 Calc No. E4C-09g Subject 4KV SMTTCHGEAR PROTECTIVE RELAY SETTING CALCULATION Sheet No.
DATE IRE DAtt aEV OtiE1NAT04 DATE IRE DATE aEV ORIG!hATOR Kim Mesley The time delay settings of the DGVSS timing relays 162S 1,162S-2,162S-3,162S-4,162T 1,162T-2,162T3,162T.4 are selected to comply with the above consideration due to the tolerances associated with these timers, sequencing timing relays, and the response time of the 127D-1,127D.2, 127D 3,127D-4 relays.
e Timing relays 162S 1,162S 2,162S 3, & 162S-4 I.osd group 2 starts at 5 seconds. Sequencing uses agastat relays with 0.5 seconds tolerance.
As such 162S timing should not exceed 4.5 seconds. The ABB 62T relay has a 4.5%
tolerance as such use a relay setting of 4.3 seconds. With this setting a DGVSS window could
{ open earliest at 4.11 seconds and latest at 4.49 seconds to allow generation of DGVSS ff 127D relay permits. This time delay satisfies PSB 1 paragraph B.1(b)(1) as discussed in paragraph 4.12.
e Timing rela)s 162T-1,162T 2,162T 3, & 162T 4 The purpose of this timer is to disable this voltage detection circuit before the start of group 2 load sequencing and close the DGVSS window. However, this must also provide a window of sufficient duration so that if the voltage at the bus drops below the 127D relay setpoint up to 1 second prior to the start of the voltage d% ; tion window (4.11 seconds) a 2.0 seconds 10% delay will be prodded for the 127D relay to establish a degraded voltage condition before the voltage detection window closes. A delay setting of 1.25 seconds is chosen for the closure of this window so that it is not affected by the second load group load starting transients which could generate a spurious DGVSS. The time delay tolerance is 0.40 second which conservatively establishes the design limits. With this delay in opening the earliest the window could close due to an early SIAS is 4.% seconds (4.11 seconds + 1.25 seconds - 0.40 seconds = 4.% seconds) and the latest the window could close is 6.14 seconds (4.49 seconds + 1.25 seconds + 0.40 seconds = 6.14 seconds).
This setting of the DGVSS window from 4.11 seconds to 6.14 seconds will detect degraded voltage in the first load group sequence and will not be affected by the subsequent load group ESF load starting transients.
e Alarm Relays 162A Timing of 5 seconds was selected to provide alarm within a total of approximately 7 seconds
( 5 seconds for 162A + 2 seconds for 127D-1,2,3, & 4).
NOTE: DGVSS trips 4.16kV Class 1E source breakers. Since the latest a DGVSS bus trip may be initiated at 6.14 seconds from the initiation of an SIAS all ESF loads shall be analyzed for operation with a degraded voltage condition upto 6.14 seconds.
l I Calculation E4C-0821CCN C-7 (reference 6.3) identified that due to the time delays of tirra 5.7 relays and 27N relays, generation of the DGVSS could be delayed for up to 6.14 seconds, therefore, SCE 2646 NEW 490
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. NES&t. DEPARTMENT ICCN NO/
(f7 - nu n e, no CALCULATION SHEt-1 muu. ceN m.
ccN COWER $loN
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ccN No. CCN . -
r rejeet or DC#/MMP UNITS 2 & 3 Cafe No. EJC-098, REV,0 8 .
Subject 4KV 5%TTCBGEAR PROTECTTVE RELAY SETTING CALCULATION _ Sheet No.
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6.23 ANSI Stant.ard 07.961988. AC Motor Protection (
6.24 Calculation E4CM Rev.0 4 KV SWGR ProtecJve Retty Setting Calculation 6.25 CaJeulation E4C-099 Rev. O . SR 480 V Power Circuit breater Setthg
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6.26 Document C93081356057, dated 813 93 - SONGS Grid, Stability and Voltage Study prepared by ,
W. D. Conner of System Plannbg and Operstloh Department
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Project or DCP/MMP UNITS 2 & 3_ Cafe No. E4C-098 1
Subject 4KV SMTTCHGFAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No.
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DATE 1RC CATE RIV ORIGINATOR DATE IRE CAf[
RIV ORIGINATOR Kim Mosley 6.22 NEMA Standard MG1 - Motor and Generator 6.23 ANSI Standard C37.96-1988 AC Motor Protection ,
6.24 Calculation E4C-098 Rev. 0 4 KV SWGR Protective Relay Setting Calculation !
l 6.25 Calculation E4C-099 Rev. 0 SR 480 V Power Circuit breaker Setting 6.26 Document C930813S6057, dated 813 93 - SONGS Grid Stability and Voltage Study prepared by W. D. Conner of System Planning and Operation Department 6.27 SO23-3 3.12 rev 0 Integrated ESF System Refueling Test.
6.28 Memo / Evaluation, dated 12 22 94,
Subject:
Component Cooling Water System / Emergency Chilled Water System Interaction, SONGS Uniu 2 and 3.
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- con NO CCN .
Project or DCP/MMP _UbTrs 2 & 3_ Cale No. LiC.098 REV. O i No.
Subject 4KV SWITCHGEAR PROTECTIVE _= _
ensmien RELAY cut SITTING
- 13. CALCULA tut j rat car tv '
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- A voltage drop of 3% in the mot'or feeder cable was considere t'
The voltage drop across the loadcenter transformer
- was, cons
. the voltage ratio shown in paragraph 8.3.2.
g .
J Cdnsidering Retty circuit inaccuracy: '
- V,,g , = 93.2 V x 0.957 = 90.12 V -
= 93.2 V, x 1.033 = 96.2.7 V V,% , '
These voltiges correspond to 85.8% and 91'68%i8 of the existin respectively. The ex! sting relay (sith 105 V tap and time di
- ' seconds at these voltages (Attachment 9.7).
( t
~s. '4TAttachinentTIsEisi'itist tlid existing relay-(wi,h;105 V tap and tim
~
In 1 second following a total loss of voltage. .
- I .8.5. . Time Delay Setpoints .
s 8.S.1 27N Relay , '
' Set the minimum time delay of 2 semsds to avoid s nuisance tripp *
. voltage dip. ,
8.5.2 Timing Reisp 162S.1,162S-2,162S.3, & 162S-4 -
Since the DGVSS should be generated during the4 setends first automatic
- ' to paragraph 1.2.4) ind the rnotor staning transient voltages are sta -
(Atuchment 9.8), a time delay of 4.3 seconds selected is adequate.
- - 8,.5.3 *nming Relays 162D 1,162D.2,162D 3, & 162D-4 '
8.5.3.1 Since SDVS will be used for protection of the permanently connect loads from sustained degraded voltage, this timing relay may be set t .
the automatic 1oad sequencing operations are completed.
h The auto =atic load sequencing operations will take 117 seconds to m
(-
- emergency chillers E335 and E336 muld start between 40 to 117 sec ,
g 6.18). Therefore, set the timing relay at 120 -
f j
at 120 semnds after a degraded voltage condition occurs. .
( -
It thould be veri 5ed that this time delay of 120 seconds will not d ~
'I. *
.. c's .fc : . ,
d.T
, .' loads as required by PSB.1 pangraph B,1.(b)(2)c -
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NES&t. DEPARTMENT ,ecy gaj CALCULATION SHEET raEtiu. CCu No. C--7 esce b or IC, CCN CONVERSION Project or DCP/MMP UNITS 2 & 3 Calc No. E4C-09g CCN No. CCN -
I' Subject 4KV SMTTCHGEAR PROTECTIVE RELAY SETTING CALCUIATION___ Sheet No.
atV Ca!GINATOR DATE IRE DAff aEV MIGINATOR DATE IRE DATE Kim Mosley Considering Relay circuit inaccuracy:
V% = 93.2 V x 0.%7 = 90.12 V V% = 93.2 V x 1.033 = 96.27 V These voltages correspond to 85.8% and 91.68% of the existing relay tap setting (105 V),
respectively. The existing relay (with 105 V tap and time dial #1) will operate within 8 seconds at these voltages (Attachment 9.7).
8.4.3 Attachment 9.7 shows that the existing relay (with 105 V tap and time dial # 1) will operate in 1 second following a total loss of voltage.
8.5 Time Delay Setpoints 8.5.1 27N Relay
( Set the minimum time delay of 2 seconds to avoid a nuisance tripping due to a transient voltage dip.
8.5.2 Timing Relays 162S 1,162S-2,162S.3, & 162S-4 Since the DGVSS should be generated during the first automatic load sequencing cycle (refer to paragraph 1.2.4) and the motor starting transient voltages are stabilized within 4 seconds (Attachment 9.8), a time delay of 4.3 seconds selected is adequate.
8.5.3 Timing Relays 162D-1,162D.2,162D-3, & 162D-4 8.5.3.1 Since SDVS will be used for protection of the permanently connected Class 1E loads from sustained degraded voltage, this timing relay may be set to operate after the automatic load sequencing operations are mmpleted.
De automatic load sequencing operations may take 117 seconds to complete since emergency chillers E335 and E336 could start between 40 to 117 seconds (reference 6.18). However, the interuption of the automatic load sequencing for these chillers will not have an adverse impact on accident mitigation operations because analysis has shown that the chillers may be unavailable for a period of 2 hrs without grave consequences (reference 6.28). The more critical Aux. Feedwater Pumps P141 and P504 are required to start at t=40 seconds from initiation of an event. The maximum time allowed for class IE motors to be subjected to degraded voltage conditions without damage is 140 seconds (sec 8.5.3.2). Therefore, set the timing relay at 110 seconds. This will allow some time for operators to establish a sustained undervoltage condition and not challenge the diesel generators
( unnecessarily. The undervoltage relay,in conjunction with this timing relay, will generate a sustained degraded voltage signal at a maximum time of 134.2 (110 +
22 + 2.2s delay for 27N) seconds after a degraded voltage condition occurs.
SCE 26-426 NEW 4S0
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NES&i. DEPARTMENT ICcN NO./
CALCULATION SHEET muu.ccN NO. C q ,m g c, a
, CCN COWERSION ccN NO. CCN - .
Profeet er CCP/MMP UNITS 2 & 3 Caio No. E4C.09F. REV. O Cubject 4KV SnTTCHGEA.R PROTECTIVE RELAY SETTING CALCULATION _ Sheet No.
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. 8.5.3.2 Impact on Clus IE meter loads due to the time delay of 120 seconds 8.5.311 It is considered that the detrimental effects of low bus voltagd is more critical on motors because they will draw excessive currents under low
" voltage condition.
Nv0 ' F'or 134.2. seconds (2.2 seconds of time delay for 2 N relay and 120+12 s,ccends of time delay for 162D relay) after a degraded' voltage conditica .
- without SIAS, the new 27 N relay may not be able to protect motors from the short time degraded voltage condition. However, the cdstir.g CV 2 relays will preside motor protection under these circumstances.
8.5.3.2.2 NEMA Standard MG1 (Reference'6.22) recommends that the thermal protector be speci5ed to limit the combination of motor and protector
( . to an ultimate trip current not exceeding 170%,156%,.and 140% of motor full load. current rating where full load current is not exceeding 9 A, between 9.1 to 20 A, and above 20 A, respectively. Motors are .
r .i.
manufactured per NEMA Standard MG1.
SONGS Units 2&3 QC If motors have been procured to operate at 10% rated voltage continuously and arc able to withstand voltage drops
. as low as 75% of rated voltage for up to 15 seconds (reference 6.19). ,
ANSI Standard C37.95 (reference 6.23) recommends that the time.
- overcurrent pickup be set at 125% of full load current.
Calculations E4C.098 (reference 6.24) and E4C-099 (reference 6.25) show that time-overcunent relap fot motors are set at 125 to 140 % of motor full load current. .
De l'25% of fullload current is equ! valent to a motor current at 80%
of rated voltage. This means.that the motor can be operated at 80%
of rated voltage for ,1,43'$ccomis, Which is operating time range of.
Westinghouse CO 5 retaf, without damage. ' ,, .
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, Based on data above,if the CV-2 relay can provide motor protection at
'75% to 80% of rated motor voltage, the nominal time delay of 120 seconds'for the timing relay 162D 1,162D.2,162D-3 & 162D-4 is
, considered adequate.
\ :; . . . . . . .
(- 8.5.3.2.f 4.16 KV motor
. , _ - . _. ; a , .. . .
- . , , ' -MyAs shown in paragraph 8.4.1, the CV.2 relay (with 105 V tap and time ,
3 ,
. .G:. $.i.Yi. .'Q;3. -fif -).-),:h,U/,dialf1) will operate within 5 seconds at 75% o G ,
- yi9 -:,r!fyr.1.M voltage.
.v . . . . , . . r ,.
. l 1
NES&L DEPARTMENT 3ceg goj CALCULATION SHEET enEtiu. CCN No. Ul eaoE W or W CCN CONVERSION CCN No. CCN -
Project or DCS/MMP UbTTS 2 & 3 Calc No. E4C-098
( '
Subject 4KV Sw?TCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. '
RfV ORIGINATOR DATE IRE DATE RIV ORtGINATOR DAff rRE eATE V
Kim Mesley It should be verifled that this maximum time delay of 134.2 seconds will not
~
damage Class 1E loads as required by PSB 1 paragraph B.I.(b)(2).
8.53.2 Impact on Class 1E motor loads due to the time delay of 110 seconds 8.53.2.1 It is considered that the detrimental effects of low bus voltage is more critical on motors because they will draw excessive currents under low voltage condition.
g{
g For 134.2 seconds (2.2 seconds of time delay for 27N relay and 110+22 seconds of time delay for 162D relay) after a degra~ded voltage condition i I without SIAS, the new 27 N relay may not be able to protect motors from the short time degraded voltage condition. However, the existing CV 2 relays will provide motor protection under these circumstances.
8.53.2.2 NEMA Standard MG1 (Reference 6.22) recommends that the thermal protector be specified to limit the combination of motor and protector to an ultimate trip current not exceeding 170%,156%, and 140% of motor full load current rating whete full load current is not exceeding 9 A, between 9.1 to 20 A, and above 20 A, respectively. Motors are manufactured per NEMA Standard MG1.
SONGS Units 2&3 QC II motors have been procured to. operate at .
210% rated voltage continuously and are able to withstand voltage dr ops as low as 75% of rated voltage for pp 10.15 seconds (reference 6.19).
ANSI Standard C37.% (reference 6.23) recommends that the time-overcurrent pickup be set at 125% of full load surrent.
Calculations E4C-098 (reference 6.24) and E4C-099 (reference 6.25) show that time-overcurrent relays for motors are set at 125 to 140 % of motor fullload current.
The 125% of fullload current is equhalent to a motor current at 80%
of rated voltage. This means that the motor can be operated at 80% of rated voltage for 140 seconds, which is the operating time range of Westinghouse CO-5 relay, without damage.
Based on data above,if the CV-2 relay can provide motor protection at 75% to 80% of rated motor voltage, the nominal time delay of 110 seconds for the timing relay 162D-1,162D-2,162D-3 & 162D-4 is ,
t considered adequate.
{
8.53.23 4.16 KV motor As shown in paragraph 8.4.1, the CV 2 relay (with 105 V tap and time sCE 264P6 NEW 4/90
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CALC.NO. PAGE TOTAL NO. OF Southern California Edison Company E4C 098 lCCN NO1 1 PAGES PREUM. CCN NO. C4 ll.0 INTERIM CALCULATION BASE CALC. REV. UNIT CCN CONVERSION : CALC.REV. 3 CCN No. CCN-CHANGE NOTICE (ICCN)/ CALCULATION CHANGE CALCULATION SUB;ECT :4KV SWGR PROTECTIVE RELAY SETTING CALCULATION NOTICE (CCN) COVER PAGE _ l ENGINEERINCI SYSTEM NUMBER / PRIMARY STATION SYSTEM DESIGNATOR Q CLASS CALCULATION CROSS 4NDEX 1804 / PBA/PBB % CONTROLLED PROGRAM OR PR AM / DATABASE NAME (S) W b@e DATABASE ACCORDINGTO ALSO, LISTED BELCW VERSION / RELEASE NO.(S) SO123-XXIV 5.1 1.BRIEF DESCRIPTION OF ICCN 1 CCN:
] PROGRAM ] DATA BASE UNIT 3 ONLY THIS ICCN VOIDS PREVIOUSLY ISSUED ICCN C4 Agastat models E7012PKL (162D), E7012PB (162T), and E7012PC (162A) are used in the SDVS and DGVSS protection schemes. This ICCN adds a design margin to the manufacturers specification of 10% for accuracy / repeatability tolerance. The design margin estabilshes circuit operability.
INmATING DOCUMENT (DCP, FCN, OTHER) MMP 2/3-2060.00SE REV. 0
- 2. OTHER AFFECTED DOCUMENTS (CHECK AS APPLICABLE FOR CCN ONLY):
O YES Q NO OTHER AFFECTED DOCUMENTS EXIST AND ARE IDENTIFIED ON ATTACHED FORM 26 S03.
- 3. APPROVAL: DISCIPLINE / ESC : ELECTRICAL K.MOSLEY 6% hido6 %f g / fa,gf g,p ff/N ORIG N TOR (Pnrt namehrstepdate) GS (Spdate) OTHER (Sgratws/este)
J.KIM/f(._ f l I 2. $5 MM ///Jh[ IRE %rt norst'lNimPdete) On (Sirstws/date) OTHER (Sig etweldste)
- 4. ASSIGNED SUPPLEMENT ALPHA DESIGNATOR :
CONVER$10N TO CCN DATE SCE CDM - SONGS SCE 261221 REV. 0 E94 [
REFERENCE:
SO123 XXIV 7.15) T**fw9fd0y$73TE' M[2 @'M e 2
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NES&l. DEPARTMENT Eu*lc'u no. C'8 mod e, ,k CALCULATION SHEET ccN cowEnsion
*t CCN No. CCN - . < r::Jes:t or DCJt/MMP _ WITS 2 & 3 Cato No. E4C-09L REV. O ' Subject 4KV SWTICr1GEUt P)tOTECTfvE REIAY SET"ITNG CA1CULAT10N _" Sheet No.
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t THIS'B EFote.' ss ThE 'hFT6M' O F .L CC M C-.h R3% 2.1.2.2 Ening rela)s 162D.1,162D 2,162D-3, & 162D-4 (refer to pars.t.53) Enc dt.!ay setting: 120 seccads
- 10% (12 seconds) ,
$ bee the Sustained Degraded Voluge Sipal (SDVS) will be used for protection
- of the pernanently connected Class 1Eloads from sustained degrade 4 voluge, this h __
t!ndg relay may be set to operate aber the automatic load/sequenchg operations are ce=pleted. A time delay of 120 setends b chosen s6ee the autog.stic load sequencing . operatiens will take 114 seconds (reference 6.16) to comp!cte. The 27N relayin conjunction with this timing relay will generate a sustained depa ded voltage sipal in 120 seconds aher a depaded voltage condition occurs. The 27N rcJay zcay not . protecs the motors from this short time depaded voltage conditions.
' However, the existing CV 2 rela)s sill proteet rooters fro:n a depsded voltage as shend in panpaph 8 5.3.2. Therefore, this time delay meets accep}ance criterion g
! >.i .3.
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.. 2.1.2.5 T!mhg Relays 162T.1,162T 2,1627 3, & If 2T-4 (refer to para. 5.6) .
TI:ne delay settEg: 1.5 seconds c'10% (0.15 se:cmd) A t!rne deJay cf 1.5 seconds is chosen to disable the depaded voluge detection circuit befere the start of the second automatic load sequencing,since the DOVSS should be geners'ad during the first automatic load sequencing, and to preside a sindow of su!5eient duration so that if the voltage at de bus drops below the 127D relay setpoint up to 1 second prior to the start of the voltage detection
' window (4.11 sezends) as 2.0 seconds delay is prenided for 127D relay to establish
'a degnded voltage condition before voltage descetion sindenv closes (refer to lparapa},h 5.6).
2.1.25 ,$, Alarm Rela)s 162A
- Time delay setting: 5 seconds e 10% (0.5 second)
. ., /
- Timhg of 5 seconds sss selected tp prenide alarm sithb a total of appretximately
~
' 7 seconds (5 seco As for 162A g 2 seconds for 127D 1,2,3, & 4).
$13 CV 2 Resh 127F.3,127F.2,127F.3, & 127F-4 (refer to para. 8.4) g '
- .: Voltage 3.0Q'Q*; setting: 105 V e 33%
. . f.':'$5?fkil?.~.5. # 1 sith operating t! zee totenece of c 5%
g : W;-? Time'di:1:1 9 4 YI[MNME 2,N.Eh-I CV 2 relay with 105 V tap and time dial # 1 wn! opente sithin 5 seecads at 75% of 4.16 KV y.J 7 :.. < m
- s. . . ..
SCE36-4:8 NEW UBoi
- NES&t. DEPARTMENT a goj CALCULATION SHEET me= CCN Na C4 moe b 1(, I CCN CONVERSION Project or DCE/MMP UNITS 2 & 3 Calc No. E4C-093 CCN No. CCN -
I Subject 4KV SMTTCHGEAR FAOTECTTVE REIAY SETTING CAIEUIATION Sheet No. , arv entstutom uit tar mir l art entstutot uit tar uit c . % i., . I i l 2.1.2.2 Timing relays 162D-1,162D-2,162D-3, & 162D-4 (refer to para.8.53) Time delay setting: 110 seconds 210%* (11 semnds)
- Note: The allowable design limit for circuit operability is 110 sec
- 20% (22 see)
Since the Sustained Degraded Voltage Signal (SDVS) will be used for protection
! of the permanently connected Class 1E loads from sustained degraded voltage, this timing relay may be set to operate after critical automatic load sequencing operations are completed.
A time delay of 110 semnds is chosen since the automatic load sequencing operations will take 40 seconds (references 6.18 and 6.28) to complete and the setting is within the established upper 11-tit of 140 seconds (see 8.53.2). As stated in section 8.53.2, the 27N relay in conjunction with this timing relay may generate a sustained degraded voltage signal at a maximum time of 134.2 seconds after a degraded voltage condition occurs. The 27N relay may not protect the motors from this short t!.me degraded voltage condition.
! However, the existing CV 2 relays will protect motors from a degraded voltage as shown in paragraph 8.5.3.2. Therefore, this time delay meets acceptance criterion 13.13.
2.1.23 Timing Relays 162T-1,162T 2,162T-3, & 162T-4 (refer to para. 5.6) Time delay setting: 1.25 seconds 10%* (0.125 second)
- Note: The allowable design limit for circuit operability is 1.25 see a 30% (0.40 sec)
A time delay of 1.25 semnds is chosen to dose the degraded voLge detection circuit before the start of the second automatic load sequencing. The earliest the window will dose is 4.% seconds and the latest the window will dose is 6.14 semnds. A 2.0 second delay is provided for the 127D relay to establish a degraded voltage condition before the voltage detection window doses (refer to paragraph 5.6). 2.1.2.4 Alarm Relays 162A (refer to para. 4.10) Time delay setting: 5 seconds 10%* (0.5 second)
- Note: The allowable design limit for circuit operability is 5 sec e 20% (1 sec)
'Uming of 5 seconds was selected to provide alarm within a total of approximately 7 semnds ( 5 seconds for 162A + 2 semnds for 127D-1,2,3, & 4).
( , 2.13 CV 2 Relays 127F-1,127F-2,127F 3, & 127F-4 (refer to para. 8.4) Voltage setting: 105 V 2 33% T1me dial: # 1 with operating time tolerance of 5% SCE 26 426 NEW 4,90
NES&1. DEPARTMENT M"u"$cN No. C- f ,4 o, S CALCULATION SHEET CCN COMTAscN ocN No. CCN . . l
~~ ejeet or DCPN.MP _Ub*rTS 2 & 3 Calc No. EdC.098, RIV. O .
Sheet No. P)cubDet 4KV 5%7tCBGEUt PROTECT 1VE entsrutot REIAY uit SETTNG nr CAlfUIAT10Nwir l arv an3nutoa _ uit . nr wir f arv
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+, This 'BEFORE.' is THE 'AF7* U OF Icc4 c-2, f 310 motor rated w1uge at 4.!T bus and at a veluge corresponding to 75% of 460 V rated motor voluge at 480 V bus. The rehy operating t!!ne of -
5 second at 75% of rated motor voluge meeu accepunos criterion 1.3.2.1. nIs refsy sith 105 V up and time did # 1 mill operate in I second foUoming a totalloss of voluge. This rday operating time of 1 second meeu acceptance criterion 1.3.2.2. 2.2 Recommendations 2.2.1 ne foUoming relay setti::ss are rece=metded: setting Tolerance Reinarks . Relay Reset (pfchp) .121.40V e 1.11% (1.35 V) Relay with 27N relay humonic filter - f, . Dropout .120.80 V (99.5% of reset)
- 1.11% (1.35 V) h.
s (127D.!,127D.2, 127D.3, & 127D-4) Time delay . 2 seconds 10% (0.2 sec.) < . CV.2 relay Voluge tap .105 V 3.3% (3.465 V)
~
(127F.3,127F.2, *5% 127F.3, & 127F 4) Time dal # 1 24.5% Timits rclay . ~ (1625 1,162S.2, , 'nme delay. 4J seconds (0.19 second) 162S.3, & 162S-4) 2 10 % Timbs relay
'nme dday.120 se.-onds (12 sejends)
(162D.1,162D.2, 162D.3, & 162D-4) Timing rday. . e 105 , (1627 1,1627 2, Time dday .1.5 setends (0.15 sacend) 16*T.3, & 162T-4) Time delay 5 secends 2 10 % *
- Timieg rejay * .
* (0.5 second) 162A
.e l e.
NES&L DEPARTMENT *"
=fCCNm C-4 CALCULATION SHEET E6 o,is CCN CONVERSloN i
Project or DC#/MMP UNITS 2 & 3 Calc No. E4C Opg CCN No. CCN -
! Sut$ect 4KV SWITCHGEAR PROTECITVE arf AY SETTING c4rrTIATION Sheet No. !
REV GRI6!NATOR BAft IRE DATE atV GaI4fMTet MTE IRE Daft l Ele Mosley I motor rated voltage at 4.16 KV bus and at a voltage corresponding to 75% of 460 V rated [ I motor voltage at 480 V bus. The relay operating time of 5 second at 75% of rated motor voltage meets acceptance criterion 13.2.1. This relay with 105 V tap and time dial # 1 will operate in 1 second following a total loss of voltage. This relay operating time of I second meets acceptance criterion 13.2.2. i 2.2 Recommendations 2.2.1 The following relay settings are recommended: 1 Relay Setting Tolerance Remarks 27N relay Reset (pickup) - 121.40V 21.11% (s35 V) Relay with harmonic filter h [ (127D 1,127D-2, Dropout 120.80 V (99.5% of reset)
- 1.11% (135 V) i 127D-3, & 127D4) Time delay- 2 seconds 210% (0.2 sec.)
CV 2 relay Voltage tap - 105 V t 3.3% (3.465 V) (127F-1,127F 2, 127F 3, & 127F-4) Time dial - # 1 t5% i Timing relay 2 4.5 % (162S 1, 162S-2, Time delay - 4.3 seconds (0.19 second) 162S 3, & 162S-4) , Timing relay 2 10 % l (162D-1,162D-2, Time delay - 110 seconds (11 seconds) 162D-3, & 162D-4) Timing relay 2 10 % (162T 1,162T 2, 'Ume delay - 1.25 seconds (0.125 second) 162T-3, & 162T-4) Timing relay Time delay - 5 seconds 2 10 % 162A (0.5 second) 1 f SCE 36428 NEW 490
.~
NES&L DEPARTMENT " '
~
CALCUl.ATION SHEET 5"t con No. O f sea o, l.6 CCNceWF.RscN
- ccN No. CCN . .
'r:Jeet or DC#/MMP UNT73 2 & 3 Ca!c No. EdC-098. REV. O Subject 4XV'SETTCEGEAR PROTECTTVE RELAY SEITING CAI.CULATION Sheet No.
an ausruton . wir nr uit j rw oussutot mir str uirl 3.'ef / s. Un' osmns a. tMIrro censns , 1 l i
- k'Trw 'BEFDRE ' IS 7"HE ' AFT 6f,.' of Icchi C-).t 93 15 l The time delay setthy of the DGVSS t!mhg rela)s 16251,162S. 1625 3, ~ 62S.4,162T.1,1627 2,16273,162T4 are selemed to comply with the above censideration due to the tolerances anociate4 sith these timen, sequencing ti.=bg relays, and the response time of the 127D 1,127D.2, '
127D.3,127D-4 rds)s. / e Timing relays 162S 1,1625 2,1625 3, & 162S-4
- 1. cad poup 2 stans at 5 seconds. Sequencing uses agastat relays sith e 0.5 seconds tolerance. ,
As such 1625 timbg should not exceca 4.S seconds. The ABB 62T relay'has a c 4.5% tolerance as such use a relay setting of 4.3 seconds. With this settbg a DGVSS stdow could . open earliest at 4.11 seconds and latest at 4.49 se.=nds to allow generation of DGVSS if 127D relay permits., Tth time delay sat!sse:s PSB.! pangnph B.1(b)(1) as thcussed in panpaph 4.12.
- e. Timing rels)s 162T.! ,5627 2,1627 3, & 162T-4 3
The purpse of thh timer is to disable th!s volu;c detection circuit before the stan of the
- lead poup 2. However th!s must aho preside a sbdow of su!5cient duration so that if the f . . . . .
voluge at the bus dreps below the 127D re'ay setpobt up to 1 second prior to the stan of the volute detection sindew (4.!! secends) a s 2.0 secends e 10% delay is picnided for 127D , , relay to establish a depaded voltage condit on before voltage detection sindow e!cses. A delay setting of 1.S seconds is chosen for the desure of thh sbdow so that it is not affected ty the second load peup load stanbg transfeats. Tbc time delay tolerance is e 0.15 second.
. With this delay in opening the c.tr11e4 .bc sindow could dose in 5.46 seconds (4.11 serends
+ 1.5 seconds . 0.15 seconds = 5.46 sezends) and the latest the sbdow could dose in 6.14
' seconds (4.49 seconds + 1.S seconds + 0.15 seconds = 6.14 seconds).
This se.iths of the DGVSS sindow from 4.11 seconds to 6.14 seconds sill detect depaded
. voltage in the fint losd povp sequence and sill not be aficced by the subsequent lead poup ESF load stan6g transients.
i-e Alann Rela)s 162A ,
. Timing of 5 seconds sss sclemed 1o preside ahnn within a total of apptbately 7 seconds (5 seconds for 162A + 2 seconds for 127D 1,2,3, & 4).
NOTE: DGVSS trips 4.161V C2 ass 1E source breakers. Sin'ce the latest a DGVSS bus trip
. may be Initiated at 6.14 seconds from the initiation of an S1AS a!! ESF loads shal!
be analyzed for operation with a'depaded witage condition upto 6.14 secends. 5.7 Calculation E4C.082 ICCN C 7 (reference 6.3) identI5e4 that due to the time deja)s of timing [ rels'ys and 27N re! )s, teneration of the DOVSS could be delayed for up to 6.14 seconds, therefore, I
- , . the minimum post trip transient SWYD voltage of 200 KV could supply power to the 4.16 KV
$.,. Cla'si1E (tWsecond)
. Q#?
buses and the second following (t=5 seconds) load poupsamaymajor disturbance stan with this minimum post trip in the pid (
NES&L DEPARTMENT ,, , CALCULATION SHEET ==. CCN No. C-8 ,,aoi 8, o,- Ho CCN CONVERSloN Project or DC#/MMP UNITS 2 RJ_ Calc No. E4C-093 CCN No. CCN -
/'
Subject 4KV GRTTCffGEAR PROTECTIVE PFr AY SETTING CALCU1ATION Sheet No. i arv entstaaten mit tar mit arv satsraaton mit rat mit l at. o., l ; I ! De time delay settings of the DGVSS timing relays 162S-1,162S-2,162S-3,162S-4,162T 1,162T-2,162T 3,162T-4 are selected to comply with the above consideration due to the tolerances assodated with these timers, sequendag timing relays, and the response time of the 127D-1,127D-2, 127D 3,127D-4 relays. e T! ming relays 162S-1,162S-2,162S-3, & 162S-4 Load group 2 starts at 5 seconds. Sequencing uses agastat relays with
- 0.5 seconds tolerance.
As such 162S timing should not exceed 4.5 seconds. De ABB 62T relay has a 2 4.5%
, ,,, tolerance as such use a relay setting of 43 seconds. With this setting a DGVSS window could
, e open earliest at 4.11 seconds and latest at 4.49 seconds to allow generation of DOVSS if 127D relay permits. His time delay satisfies PSB 1 paragraph B.1(b)(1) as discussed in paragraph 4.12.
e Timing relays 162T 1,162T 2,162T 3, & 162T-4 De purpose of this timer is to disable this voltage detection circuit before the start of group 2 load sequencing and dose the DGVSS window. However, this must also provide a window [ of sufficient duration so that if the voltage at the bus drops below the 127D relay setpoint I up to I second prior to the start of the voltage detection window (4.11 seconds) a 2.0 seconds 210% delay will be provided for the 127D relay to establish a degraded voltage condition before the voltage detection window doses. A delay setting of 1.25 seconds is chosen for the dosure of this window so that it is not affected by the second load group load starting transients which could generate a spurious DGVSS. He time delay tolerance is 2 0.40 second which conservatively establishes the design limits. With this delay in opening the earliest the window could dose due to an early SIAS is 4.96 seconds (4.11 seconds + 1.25 seconds - 0.40 seconds = 4.% seconds) and the latest the window could dose is 6.14 seconds (4.49 seconds + 1.25 semnds + 0.40 seconds = 6.14 seconds). This setting of the DGVSS window from 4.11 seconds to 6.14 seconds will detect degraded voltage in the first load group sequence and will no. be affected by the subsequent load group - ESF load starting transients.
- Alarm Relays 162A Timing of 5 seconds was selected to provide stann within a total of appradmately 7 seconds
( 5 seconds for 162A + 2 seconds for 127D-1,2,3, & 4). NOTE: DGVSS trips 4.16kV C2 ass 1E source breakers. Since the latest a DGVSS bus trip may be initiated at 6.14 seconds from the initiation of an SIAS all ESF loads shall be analyzed for operation with a degraded voltage condition upto 6.14 seconds. i ( 5.7 Calculation E4C 082 ICCN C-7 (referena 6.3) identified that due to the time delays of timing relays and 27N relays, generation of the DGVSS could be delayed for up to 6.14 seconds, therefore, 1 SCE 36 426 NEW 4/a0 _ -- - - - - - - - e
. NES&!.DEPARTMEtn DCcN NOJ y .)(6 CALCULATION SHEET nzuw ecN No. C-F- uct :
ccN COWrEON 8t rjeet or DCWMMP UFITS 2 & 3 Calc No. E4C.09L REY. 0 . CCN NO. CCN . - Subject 4KV'S%77CHGEAR PROTECTIVE RELAY SETTNG CAIEULAT10N _ Sheet No. arv ausrutoa mir > tte uit j an ettsrutoa uit nr utt l J. afm"7 s. sm ne/n3[3 n.cNte, os/n/nl l , l -
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46 T4ls '5ElbtE' 15 TriE 'AFTEE' o F ICCt4 C-2. p. E3M 6.22 NEMA Standard Mol . Motor and Genenter
. ~
6.23 ANSI Standard C37.961988. AC Motor Protection .
. 8 6.24 Calculation E4C 098 Rev. 0 4 KV SWOR Protective Relay Setting Calculation 6.25 Calculation E4C.099 Rev. 0 SR 480 V Power Circuit breaker Settieg 6.26 Document C93081356057, da,ted 813 93. SONOS Grid.Subility and Voltage Study prepared by ,
W. D. Cor.ner of S) stem Planning and Opention Depanment , f. t. s s e
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NES&L DEPARTMENT ces goj CALCULATION SHEET ratuu. CCN NO. 6 ,aos MO , ) CCN CORERSION CCN NO. CCN - 8 Project or DC#/MMP Uh*ITs 2 & 3 Calc No. E4C-093 t Subject 4KV 5%7TCRGEAR PROTECTIVE RELAY SETTING CALCULATION Sheet No. arv earsruAton oAtt tar DAtt larv oarstKAtDa DAtt Itt DAtt c . . .i., I I
,wD 6.22 NEMA Standard MG1 - Motor and Generator . # p 6.23 ANSI Standard C37.96-1988 - AC Motor Protection 6.24 Calculation E4C-098 Rev. 0 - 4 KV SWOR Protective Relay Setting calculation 6.25 Calculation E4C-099 Rev. 0 - SR 480 V Power Circuit breaker Setting 6.26 Document C930813S6057, dated 813 93 - SONGS Grid Stability and Voltage 5tudy prepared by W. D. Conner of System Planning and Operation Department 6.27 SO23-3-3.12 rev 0, Integrated ESF System Refueling Test.
6.28 Memo / Evaluation, dated 12-22-94,
Subject:
Component Cooling Water System / Emergency Chilled Water System Interaction, SONGS Units 2 and 3. i e t r BCE 26-426 NEW 4,90
** :,' > . *' ~ '.t* s- s..
T M tf ?') U **;*tt S '?.*. . . uceilor.& NES&l.DEPAR'TMENT M c"no.C-6
. CALCULATION SHEET CCN Co.WERSloN -
- cCN No. CCN -
Project or CC#/MMP WITS 2 & 3_ Calc No. EdC.098. REV. O Subject _4KV SWHCHGEAR PROTECTIVE RELAY mt 55TnrnNG CAI.CUL nut ] i oust m en sur nt mr _l aty arv oustmot ee/u/s3__ Mitte / ssM oe/n/n a. t Dfbe rTHiO6fME'is THE hf7ER. ' OF TCM ( .2.s ( $1 Avoltage drop of 3% in the motor feeder cable was considered.
- t' Thevoltage drop across the loadeenter transformer
- was, considere I
the voltage nilo shown in paragraph 8.3.2. Considering Reity circuit inaccuracy *
- . V% ; = 93.2 V x 0.957 = 90.12 V ~
V,% = 93.2 V, x 1.033 - 96.2,7 V , These voluges correspond to $5.8% and 91.'68% of the exis respectively. The existbr relay (sith 105 V tap and time dial #1) :
*
- seconds at these voltages . . . ..tachment 9.7). -
- ~
8.4.3 AttachinentT*TifidmTtliit tlifesisting relay;(w'ith 105-V tap and time~l dia 4 - -
~~
f in 1 second following a total loss of voltage. i
-; 8.5, , Tirne Delay Setpoints , .
t 8.5.1 27N Relay ,
' Set the minimum time delay of 2 seconds to svold a nuisance tripping due ,
. voltage dip. ,
8.5.2 *nming Reisys 16251,162S 2,162S.3, & 162S-4 ~ Since the DGVSS should be generated during the first automa tie load seque
- to paragraph 1.2.4) ind tht raotor starting transient voltages are stabili -
." * (Attachment 9.8), a tim: delay of 4.3 seconds selected is adequate.
- '- - 8.5.3 *nming Rela)s 162D.1,162D.2,162D 3, & 162D.4 '
j
- 8.5.3,1 Since SDVS will be used for protection of the permanently connected Class IE ,
loads from sustained digraded voltage,this timingrelay may be set to operate af - the automatic 1oad sequencing operations are completed. ,
- The automatic load sequencing operations will take 117 seconds to cornpfete s l emergency chillers E335 and E336 could start between 40 to 117 seconds (re ,
6.18). Therefore, set the timing relay at 120 seconds. The undervoltage
~ .
f; ' conjunction with this timing relay,will generate a sustained degraded vol - j , at 120 seconds after a degraded voltage condition occurs. It should be veri 5ed that this time delay of 120 serends sill not damage Cla
"~. /h ,w S: ,
[9 ;'. ; . ';' ,. ; - lands as required by PSB.1 paragraph B.1.(b)(2).- , g - -
\
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NES81 DEPARTMENT , gnj j CALCULATION SHEET == CCN NO. C4 mEl,b 16 CCN COWERSON l Project or DCP/MMP UNTTS 2 & 3 Calc No. E4C 093 CCN NO. CCN - l
*n i Subject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CAIEUIAT10N Sheet No.
l a[W aals!NATOR MTE Ist Mit arV aR!s!NATOR MTE Rt MTE l Kle Mostey ' l l Considering Relay drcuit inaccuracy: i V, = 93.2 V x 0.967 = 90.12 V V, = 93.2 V x 1.033 = 96.27 V { Dese voltages correspond to 85.8% and 91.68% of the cdsting relay tap setting (105 V), respectively. The existing relay (with 105 V tap and time dial #1) will operate within 8 ' seconds at these voltages (Attachment 9.7). 8.43 Attachment 9.7 shows that the existing relay (with 105 V tap and time dial # 1) will operate in 1 second following a total loss of voltage. 8.5 Time Delay Setpoints 8.5.1 27N Relay
/ Set the minimum time delay of 2 seconds to avoid a nuisance tripping due to a transient i i voltage dip.
8.5.2 Timing Relays 162S.1,162S-2,162S-3, & 162S-4 Sina the DGVSS should be generated during the Erst automatic load sequencing cycle (refer to paragraph 1.2.4) and the motor starting transient voltages are stabilized within 4 seconds (Attachment 9.8), a time delay of 43 seconds selected is adequate. 8.53 Timing Relap 162D-1,162D 2,162D-3, & 162D-4 8.53.1 Since SDVS will be used for protection of the permanently connected Class 1E loads from sustained degraded voltage, this timing relay may be set to operate after the automatic load sequendng operations are completed. The automatic load sequencing operations may take 117 seconds to complete since ; emergency chillers E335 and E336 could start between 40 to 117 seconds (reference 6.18). However, the interuption of the automaticload sequendng for these chillers will not have an adverse impact on acddent mitigation operations because analysis ; has shown that the chillers may be unavailable for a period of 2 hrs without grave consequences (reference 6.28) De more critical Aux. Feedwater Pumps P141 and F504 are required to start at t=40 semnds from initiation of an event. De marimum time allowed for dass 1E motors to be subjected to degraded voltage conditions without damage is 140 seconds (see 8.53.2). Derefore, set the timing ; relay at 110 seconds. His will allow some time for operators to establish a ! sustained undervoltage condition and not challenge the diesel generators { unnecessarily. He undervoltage relay,in conjunction with this timing relay, will t generate a sustained degraded voltage signal at a maximum time of 134.2 (110 + ' ' 22 + 2.2s delay for 27N) seconds after a degraded voltage condition occurs. ; , i SCE 26 426 NEW 4.90
..- mo
- 1 I .
1,' . ! NES&L DEPARTMENT
. CALCULATION SHEET E's"ECCNNO. c-f ,,, g c, g i CCN CONVERSION S ..
' J CCN NO. CCN .
/ Project or DCP/MMP UNITS 2 & } Ca!c No. E4C.0ct. REV. O Aubject 4KV SBTTCHGEAR PROTECTIVE REL4Y SETTING CALCULATION Sheet No.
art entstufot utt' tst uir l att ontstutot uit nr att
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. 8.5.3.2 Impact on Class 1E motor loads due to the time delay of 120 seconds 8.5.311 It is considered that the detrimental effects of low bus voltaglis mere critical on motors because they will draw excessive currents under low voltage condition.
. s For 134.2. seconds (12 seconds of time delay for 27N telay and 120+ 12 ' l
- seconds of time delay for 162D relsy) after a degradedwltage condition a without SIAS, the new 27 N relay may not be able to protect motors from the shon time degraded voltage condition. Homewr, the existing
. . CV.2 relays will preside motor protection under these circumstances.
. 8 . 5 . 3.32. 2 NEMA Standard MG1 (Referenec' 6.22) recommends thit the thenna!
protector be speci5cd to limit the combination of motor and protector .
.. to an ultimate trip current not exceeding 170%,156%,.and 140% of g
motor full load, current rating where full load curTent is not exceeding , 9 A, between 9.1 to 20 A, and above 20 A, respectively. Motors are .
..g- - manufactured per NEMA Standard MG1.
i .) . SONGS Units 2&3 QC II' motors have been procured to operate'at l 210% rated voltage continuousfy and are able to withstand voltage drops
. u low as 75% cf rated voltage for up to 15 seconds (reference 6.19). ,
' l ANSI Standard C37.96 (reference 6.23) recommends that the time.
. overcurrent pickup be se.t at 125% of full load current.
* . Calculations E4C-098 (reference 6.24) and E4C-099 (reference 6.25)
' s show that time.overcurrent'relsp for motors are set at 125 to 140 % of .
. . - motor full load current. .
g ,. .
~
*ne l'25% of full load current is equivalent to a motor current at 80%
,- .
- 6f rated voltage. This meansJhat the motor'can be operate'd at.80%
of rated voltage for,FM, Mich is operatirg time range of.
. , : ., c - Westinghouse CO.5 r,elay, without damage. ' ,,
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Based on data above,if the CV.t relay can provide motor protection at s
,- s.;
75% to 80% of nted motcr wealtage, the nominal time delay of 120
.* , , , seconds'for the timing relay 162D.1,162D.2,162D 3 & 162D.4 is ,
;, considered adequate.
- f;. , ,
- . ' ci :; . Y.* . . . ; .: . .
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. .; ,8.5.3.2{ .4.16 KV motor i t . ,- .
' ~* I yg. ~)-W.M...# [.7/.19.[. O. . .. s.h: a . ;. -
?.. . . ..(Af$ t, As shown in paragraph 8.4.1, the CV 2 relay (with 105 V tap and II,mc f 7: r %.'.y.' ,/ . s . i
- fJig*W1tage. dial #1) will operate with!n 5 seconds at 75% of the -
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. Project or DCD/MMP UNITS 2 a 3 Calc No. E4C-093 Subject 4KV SWITCBGEAR PROTECTIVE nrr4Y SETITNG CALCUIATION Sheet No. ~ -
arv earsinton utt rat mir arv earsruton mir rat mit l l
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It should be veri 5ed that this mavimum time delay of 134.2 seconds will not '
~
damage Cass IE loads as required by PSB 1 paragraph B.1.(b)(2). 8.53.2 Impact on Cass 1E motor loads due to the time delay of 110 seconds 8.53.2.1 It is considered that the detrimental effects of low bus voltage is more critical on motors because they will draw excessive currents under low voltage condition. r i For 134.2 seconds (2.2 seconds of time delay for 27N relay and 110+22 ,' y seconds of time delay for 162D relay) after a degraded voltage condition i without SIAS, the new 27 N relay may not be able to protect motors from the shon time degraded voltage condition. Honver, the existing
- CV 2 relap Mll provide motor protection under these circumstances. .
8.5.3.2.2 NEMA Standard MG1 (Reference 6.22) recommends that the thermal protector be speci5ed to limit the combination of motor and protector (, to an ultimate trip current not exceeding 170%,156%, and 140% of motor full load current rating where full load current is not exceeding 9 A, between 9.1 to 20 A, and above 20 A, respectively. Mowrs are manufactured per NEMA Standard MG1. . 5 ' SONGS Units 2&3 QC II motors have been procured to operate at ,.
- 10% rated voltage continuously and are able Io withstand voltage drops as low as 75% of rated voltage for pp to. 15 secon.ds (reference 6.19).
ANSI Standard C37.% (reference 6.23) recommends that the time-overcurrent pickup be set at 125% of full losscurrent. Calculations E4C 098 (reference 6.24) and E4C 099 (reference 6.25) show that time.overcurrent relays for motors are set at 125 to 140 % of motor fullload current. i
'ne 125% of full load current is equivalent to a motor current at 80% -
of rated voltage. This means that the motor an be operated at 80% of rated voltage for 140 seconds, which is the operating time range of Westinghouse CO.5 relay, without damage, j Based on data above,if the CV 2 relay can provide motor protection at 75% to 80% of rated motor voltage, the nominal time delay of 110 seconds for the timing relay 162D-1,162D-2,162D-3 & 162D.4 is considered adequate. I ( 8.53.23 4.16 KV motor As shown in paragraph 8.4.1, the CV 2 relry (with 105 V tap and time SCE 26 428 NEW 490 _ _ _ - _ 1
. s n.,. . . .
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{ c - c p., enas cac mav tuwrts 18 ,ca cc= cowvsmoow 1 c u sev 7 i INTEfuM CALCULATION 2 ccw no oca. 0 ! CHANGE NOTICE (ICCN)/ [ CALCutATION CHANGE NOTICE (CCN) cucui,Atow smet. l 4 KV SWGR PROTECTNE RELAY SETTWG CALCULAflON CALCULATION CmWDEX * * * * ' " "
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- 1. BRIEF DESCRIPTION OF ICCN/CCN: I UNIT 2 ONLY !
I THIS ICCN WAS PREPARED TO REVISE ICCN C-1 TO REFLECT THE FOLLOWING CHANGES: e DELETION OF TRANSDUCER TDV FROM VOLTAGE TRANSFORMER BURDEN CALCULATION. TRANSDUCERS TDV FOR CONTROL ROOM VOLTMETER 2EI-1662 AND TDV1 FOR CFMS INPUT ARE CURRENTLY CONNECTED TO THE SAME SET l OF VOLTAGE TRANSFORMERS. THIS DESIGN COULD CAUSE H0 CLASS 1E 4.16 KV BUS V0LTAGE INDICATION AT THE CONTROL ROOM DURING A FAILURE OF THE V0LTAGE TRANSFORMER. THEREFORE, TRANSDUCER TDV WILL l BE MOVED TO OTHER SET OF VOLTAGE TRANSFORMERS. e ADDITION OF THE JUSTIFICATIONS FOR THE TIME DELAY OF 135 SECONDS WHICH WILL BE LISTED IN THE ; TECHNICAL SPECIFICATION FOR SUSTAINED DEGRADED VOLTAGE $1GNAL WITHOUT $1AS. 1 THIS ICCN REPLACES PAGES 33, 34, 38, 39, 40, AND 52 0F ICCN C-1 AS FOLLOW: CORRESPONf)ING ICCN C-1 ICCN C-3 PAGE NO PAGE N0 33 2 34 3 38 4 RECElVED COM j' l SEP 151993 s2 7 3ITE flLE COPY
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It!T!ATING 00CLMENT (NCR, SPR, OTN(a) MMP # 2&3 2060.00$E new. O I. Seine artWTeg me.31FFS (CSCs as apetitekt Pee CC. 8.LT): { } til It} m start aFFffig " tutsts (Its? an as tWirrtrits e affatsE3 Fem 26-903.
- 3. APPROVAL: , O!SCIPLINE/Est:WEDO / tttttalCAL C
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E . . N CALCULATION SHEET * " "L NO. C- 3
=u ,ao, a A CCN -
Project or DCS/MMP UNTI3 2 & 3 Calc No. E4C 098. REV,0 _ CCN NO. CCN - ( 'ut$ect 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. ttV SR!s!MTOR MTE IRE MTE ttV setsIMTom MTE IRE Mit J. sin h 09/Dr/93 R. cetbag 09/02/93 Be, = 0 since there are no loads connected across this phase. De total burden is then the sum of the burdens across the other two phases B4 , and Bee (refer to reference 6.5 & Attachment 9.4) B4, = Bmi + By, + Ba,oi + Buiri + Busai.exrnas where: Brovi = 2 VA 20' (refer to para. 3.3) By, = 0.288 VA 20* (reference 6.7) l Buvoi = 0.5 VA 20' (reference 6.8) Ba,,, = 2.4 VA 273* lagging (reference 6.9) Buta = 17 VA /27' lagging (reference 6.10) Bm.ui,som = (120V2 / (17 VA) 427* = 754.70 + j384.5O @ 120V B i r,mi.extass = 754.70 + j384.50 + 106O = 860.70 + j384.50 (see note below) ; Bg,ni . sxt ass = (120 V)2 / (860 +j384.5)O = 15.3 424.1* @ 120V B4, = 2+0.288+0.5+(0.7+j2.29)+(13.%+j6.25) = 17.448+j8.54 Note: The 1060 external resistor in series with the 127R residual relays has been included in the calculation of overall burden (refer to ref. 6.17). In addition, the cable l impedance of the Data Acquisition Unit is conservatively mnsidered negligible since adding the cable impedance would reduce the overall burden. B,e = Ba,o2 + Buvr2 + Bainz.sxtmas + B,m where: Ba,o = 0.5 VA 20' (reference 6.8) Be,,2 = 2.4 VA 273* lagging (reference 6.9) By,,a = 17 VA 427* lagging (reference 6.10) Ba,ms.sxram = 15.3 VA 424.P
- De burden caused by the synchroscope circuit, B,mcomes from voltage transducers, frequency transducers, and the synchroscopes. The synchroscope circuit is broken into two parts, the incoming channel and thetunning channel. Since the pts, on the undervoltage circuit, can be connected to either of the channels, incoming or running, it is necessary to determine the channel with the largest burden.
Dere is an equivalent number of trarmiucers on either channel. However, the syechroscopes create more burden on the incoming channel than the running channel. De incoming channel is, therefore, conservatively used as the limiting case for greatest circuit burden. De following instruments are fed on the incoming channel (Ref 6.11 and 6.12): oCE 36438 pe# 4/so _ _ - _ . _ _ . _ _ _ ______m ___ _____ - - _ _ w - ,----c - - - - - - - - - e v
. NES&L DEPARTMENT , goj
. CALCULATION SHEET m uu CCNNa C-S 2., a y 7 CCN CCMEASON Project or DCD/MMP UNITS 2 & 3 Calc No. E4C 498. REV,9 CCN NO. CCN -
( i Jubject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. AtV M!stWTM Mit IRE MYt REV ettsta4 TOR a4TE IRE MTE J. Kim h 09/02/93 R. cabin 9 09/02/93 Instrument ID Function Manufacturer Mgdg1 f l 2EY 1627B Voltage Transducer ScientWe Columbus VT110A2 2/3 EY-1627B Voltage Transducer Scientific Columbus VT110A2 l 1 3EY.1627B Voltage Transducer Scienti8c Columbus VT110A2 2SY 1627B Freq Transducer Scienti8c Columbus 6284A 2/3 SY 152TB Freq Transducer Scienti5c Columbus 6284A
. 3SY-1627B Freq Transducer Scienti5c Columbus 6284A 2SI 1627C Synchroscope General Electric AB-16 50120-452 2/3 S11627A Synchroscope General Electric AB 16 50120 452 l 2/3 SI 1627B Synchroscope General Electric AB-16 50120-452 3SI-1627C Synchroscope General Electric AB 16 50-120-452 Therefore:
Bsm = (3 x BmTm.ra) + (3 x B,anom) + (4 x Bs-) where: k i Bay.m = 2.5 VA 20* (Attachment 93) Be m = 4 VA 20* (Attachment 93) ; Bs m s = 4.2 VA 233.9 (Attachment 93) B n = 3x2.5 VA + 3x4 VA + 4x4.2 VA 233.9 = 33.44 + j937 VA B c = 0.5 + 2.4 473' + 153 424.1* + 33.44 + j937 VA = 48.11 + jl7.912 VA Br = Bo + Bee
= 17.448 + j8.54 c 48,11 + jl7.912 = 65.558 + J26.452 = 70.69 z21.97*
Since the burden is less than 129.9 VA, the PT inaccuracy of 203% is adequate for use in this calculation. . l l l l I (t sCE as 426 NEW 4/30
NES&L DEPARTMENT E No. C-5 i CALCULATION SHEET ,,ao 4 , 7 i CCN CONVERSION Project or DCD/MMP UNITS 2 & 3 Calc No. E4C 098. REV,9 .. CCN No. CCN - ut$ect (KV SWITCHGFAR. PROTECTIVE REIAY SE1 TING CALCUIAT10N'. Sheet No. arv saisinton utt tar mit arv eerstata mit sat mit J. xi. _$ D oe/or/es n.ca@1tne os/or/es l critical on motors i,ecause they will draw excessive currents under low i voltage condition. i Fet 134.2 seconds (2.2 seconds of time delay for 27N relay and 120+12 seconds of time delay for 162D relay) after a degraded voltage condition without SIAS, the new 27 N relay may not be able to protect motors j from the short time degraded voltage condition. However, the existing CV 2 relays will provide motor protection under these circumstances.
)
8.5.3.2.2 NEMA Standard MG1 (Reference 6.22) recommends that the' thermal protector be speci5ed to limit the combination of motor and protector , , to an ultimate trip current not exceeding 170%,156%, and 140% of wotor full load current rating where full load current is not exceeding 9 A, between 9.1 to 20 A, and above 20 A respectively. Motors are manufactured per NEMA Standard MG1. I SONGS Units 2&3 QC II motors have been procured to operate at < ( 210% rated voltage continuously and are able to withstand voltage drops ; as low as 75% of rated voltage for up to 15 seconds (reference 6.19). ANSI Standard C37.% (reference 6.23) remmmends that the time-overcurrent pickup be set at 125% of full load current. Calculations E4C 098 (reference 6.24) and E4C-099 (reference 6.25) show that time.overcurrent relays for motors are set at 125 to 140 % of motor full load current. The 125% of full load current is equivalent to a motor current at 80% of rated voltage. This m ans that the motor can be operated at 80% of rated voltage for 140 seconds, which is operating time range of Westinghouse CO-5 relay, without damage. Based on data above, if the CV 2 relay can provide motor protection at 75% to 80% of rated motor voltage, the nominal time delay of 120 seconds for the timing relay 162D-1,162D 2,162D-3 & 162D-4 is considered adequate. 8.5.3.2.3 4.16 KV motor As shown in paragraph 8.4.1, the CV-2 relay (with 105 V tap and time dial #1) will operate within 5 semnds at 75% of the rated motor voltage. The voltage at the CV-2 relay corresponding to 80% of 4.16 KV motor voltage:
' NES&L DEPARTMENT CALCULATION SHEET
+
E* N NO. C-5 ... s o, 7 CCN CONVERSON Project or DCst/MMP UNITS 2 & 3 Calc No. E4C-098. REV. O CCN NO. CCN - subject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION- Sheet No. l arv earsrutoa mit rat amir arv aarsruton mit rat i mir J. Kim h 09/02/93 m.rabing 09/02/93 j V, = (0.80 x rated motor voltage) / PT ratio
= (0.80 x 4160 V) / 35
= 95.09 V De voltage drop between 4.16 KV bus and a motor is considered negligible.
Considering Relay circuit inaccuracy: V% = 95.09 V x 0.%7 = 91.95 V V, = 95.09 V x 1.033 = 98.23 V Dese voltages correspond to 87.5% and 9335% of the existing CV 2
, relay tap setting (105 V), respectively. De existing relay (with 105 V \' tap and time dial #1) will operate within 8 seconds at these voltages (refer to Attachment 9.7). 4 Derefore, the CV 2 relay will provide protection to 4.16 KV motors at 75% to 80% of rated motor voltage and the time delay of 134.2 seconds after a degraded voltage condition without SIAS is considered acceptable. -
8.53.2.4 460 V motor As shown in paragraph 8.4.2, the CV 2 relay (with 105 V tap and time '; dial #1) will operate within 8 seconds at 75% of the rated motor voltage.
. De voltage at the CV-2 relay corresponding to 80% of 46) V motor voltage:
V, = [0.80x460 Vx 1.03x(4160V/480V)X(1.00124A).94523)]/35
= 99.41 V A voltage drop 6f 3% in the motor feeder cable was considered.
De voltage drop across the loadcenter transformer was
- k. considered per the voltage ratio shown in paragraph 8.3.2.
Considering Relay circuit inaccuracy: l sCE 28 426 NEW #0
- NES&L DEPARTMENT ' " "
CALCULATION SHEET mt CCN NO. C-3 nos 6 -J_ CCN CONVERSION Project or DCP/MMP UNTFS 2 & 3 Calc No. E4C 098. REV. 9 CCN NO. CCN . k dubject 4KV SMTTCHGEAR PROTECTTVE REIAY SETTING CALCUIATION' Sheet No. RtV DR16ImAfot MTE Itt MTE . Rtv ORIGINATOR DATE IRE Daft J. Kim d b 09/02/93 R. Caking e9/02/93 V% = 99.41 V x 0.%7 = %.13 V l V, = 99.41 V x 1.033 = 102.69 V
]
These voltages correspond to 91.55% and 97.8% of the existing CV-2 relay tap setting (105 V), respectively. De existing relay (with 105 V l tap and time dial #1) will operate in approximately 15 seconds at these l voltages (refer to Attachment 9.7). Herefore, the CV 2 relay will provide protection to 460 V motors at ' l
- 75% to 80% of rated motor voltage and the time delay of 134.2 seconds after a degraded voltage condition without SIAS is considered acceptable.
8.6 Impact on the first and second load group anotors due to the minimum post trip transient of 200 KV in the switchyard [' 8.6.1 Since motor starting impedance is constant impedance, motor starting current is proportional to motor terminal voltage. Derefore, the starting current of the motor with the minimum post trip transient of 200 KV in the switchyard must be less than its rated starting current. However, the motor starting time with the minimum post trip transient of 200 KV in the ! switchyard is longer than the motor starting time with the rated voltage as shown in , paragraph 4.1.2. ! If the trip times of the relays or circuit breakers at the rated locked rotor currents of the l associated motors are less than the motor starting times listed in paragraph 4.1.2, it is l conservatively considered that the motor starting current with the minimum post trip transient SWYD voltage of 200 KV will not cause the lockout of the associated feeder breakers of the first and second load group motors. 6 (. SCE 26426 NEW 4/90
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ccn nos i meuw ccN uo C- S cCN CONvtMeoN nos 7er7 ' ccN No CCN . ( ATTACHMENT 9.4 Sheet CALCULATION No. E4C 098 REV. 0100."; C #C i i Page l of l Potential Transformer Burden A B C h M - 4200/120 M N I a TOV 1 09R 127Di
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- 1. SRIEF DESCRIPTION OF ICCN/CCN:
UNIT 2 ONLY THIS ICCN PROVIDES THE BA5!S FOR THE TECHNICAL SPECIFICATION SURVEILLANCE SETPOINTS AND THE RELAY SETTINGS SPECIFIED IN ESL DOCUMENT 90042 IDCN ~ 5-15 PREPARED IN SUPPORT OF MMP 2 & 3-2060.005E. , l ( ) RECEIVED CDM AUG 261993 SITE fil.E COPY INITIATING DOCJ(NT (NCR, SPR, CTHER) MMP # 2&3-2060.00$E Rev. 0
- 2. cue arrets snowns tcwc as asettcasts m ca saf):
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- 3. APPROVAL:
- 0!$CIPLINUESC:NtD0 / tttCTRICAL
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l Calculation No. E4C-098 Rev. O Sheet No. a co wres an: am.CCN-case. rev. wws mms oo ouipui number and These Intedecing **% andfor documente Resulte end conclusions of the outdoct ceaculselon are used insedece Idonefy output insedece responsible provide input % Wie outdoct ___ _ _" "-- , and N revised in these insedecing calculatione endfor documente cele /documert coac/ document CCN or DCN supervloot may require revision of Wie out4ect celed %n require revleton? TCMHov. or FDCN
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0/ CALC. E4b17 11 CALC. E4C-082 , 1 YES ICCN C-7 0.41C. E4C-050 12 CALC. E4C-090 1 YES ICCN C-7 CALC. E4C-062 ICCN C-7 1 TECHNICAL SPECIFICATION - YES MMP 2&3 l 2060.00SE i CALC. E4C-090 ICCN C-7 1 DOCUMENT 90042 3 YES IDCN S-15 Drawing 30220 8 Drawing 30229 10 Drawing 31468 4 DBD-SO23-120 0 SPECIFICATION 1 S023-302-3-12 DOCUMENT 90042 3 SCE STD JS-123-103C 0 l V/P SO23-302-2-84 4 V/P SO23-302-2-85 3 l V/P SO23-306-6-16 1 V/P SO23-503-13 0
. IGE 26-424 FitV. 9Fai
ummam ,CCN ~Os CALCULATION SHEET *asuu. CCu ~O C-l noe :s o, s3 cCN CONVERSION Project or DC#/MMP UNITS 2 & 3 Calc N2. E4C.098. REV. O CCN NO. CCN - 1 i ;ubject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. Rtv et!E!alTM MTE 1Rt Mit arv Otis!RATOR Mit IRE Mit h.Kim/ 8. Sa 08/13/93 R. C ing 08/13/93 TABLE OF CONTENTS 1 PURPOSE.................................................................. 4 1.1 Purpose................................................................ 4 IJ Backg rou nd . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Acceptance Criteria . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3 2 RESULTS/ CONCLUSIONS and RECOMMENDATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Res ults/ Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2 Recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 ASS UM PTI O N S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 D ES I G N INP UT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 l'i 5 M ETH O D O LO G Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6 REFEREN C ES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7 N O M EN CIATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5 EVALUATIO N / COMP UTATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 9 ATTA CIIMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 e (.. ( sCE M NEW 440 {
NES4:L DEEACENT l CALCULATION SHEET %"u" CCN No C-l ..a J 3 l CCN CONVER$80N Project or DCP/MMP UNTTS 2 & 3 Calc N3. E4C-098. REV. O CCN No. CCN - f Subject 4KV 5%TTCHGEAR PROTECTTVE RELAY SE'TTING CALCULATION Sheet No. ,_ BrV ORIGIRATOR MTr IRE MTr trY OR!s!MTOR MTr IRE MTE tin / 8. Ses 08/13/93 R. cbteg 08/13/93 l 1 PURPOSE i 1.1 Purpose ; The purpose of this calculation is to determine the optimum voltage and time delay setpoints for the degraded undervoltage protection scheme which will detect a degraded voltage condition in the 4.16 KV Class IE buses corresponding to the grid voltage below the currently analyzed value of 218 KV. In support of MMP # 2 & 3 2060.00SE, this calculation will: m Determine ABB 27N undervoltage relay and time delay relay setpoints in conjunction with the degraded voltage protection scheme. a Provide the bases for the Technical Specifications trip setpoints with minimum and maximum limits and allowable values for the second level undervoltage protectt : sensors. s Verify the adequacy of the existing CV-2 undervoltage relay setting. {
1.2 Background
1.2.1 With the permanent shutdown of Unit 1, a SONOS grid stability and voltage study (reference 6.26) performed by SCE System Planning and Operations Department concluded that the voltage in the switchyard may fall below the acceptable level of 218 KV under the following conditions:
- a. Either SONOS Unit 2 or 3 is in an outage situation,
- b. SCE system load exceeds specified thresholds (typical of heavy system loading during hot summer day afternoon),
c- Loss of a certain critical transmission line or lines due to a single event (e.g. loss of a transmission tower),
- d. and a design basis accident or unit trip.
The 218 KV is the minimum switchyard voltage that is required to provide adequate voltages to the accident mitigation loads (refer to reference 6.4). Under the above scenario following a Safety lajection Actuation Signal (SLAS), the turbine-generator trip can cause voltage degradation at the SONOS switchyard (reference 6.26). With
, the existing design, the unit experiencing a trip under this event scenario will attempt to transfer its 4.16 KV Class IE buses to the companion unit via the bus-tic breaker. However,
[' because the switchyard voltage for both units would be in a degraded condition, the alternate preferred power source would be unavailable and the unit would need to transfer its 4.16 KV Class IE buses to the standby pomer source, which has started on receipt upon the SIAS. sCE 26428 NEW 4/90
NES&L DEPARTMENT CALCULATION SHEET E no. C-l oo, s a ccN CONVERSON Project or DCS/MMP UNITS 2 & 3 Calc No. E4C-098. REV, e CCN NO. CCN - ( Jt$ect 4KV SWITCHGEAR PROTECTIVE RELAY SETTING CALCUIgpN Sheet No. aEV GR2athsTOR asfr Mt a4ft atV OR!s msfat NTE ME ufr Yct./ s. suY es/ts/s3 R.c.Mine os/t3/s3 If the 4.16 KV Class IE buses do not go directly to the standby power source during a SIAS with degraded voltage scenario, it is likely that the approximately 10 seconds allowed by the Updated Final Safety Analysis Report (UFSAR) Chapter 15 safety analyses will be ==ted before standby power becomes available to the safety related loads. 1.2.2 MMP 2&3 2060.00SE will install a set of new undervoltage relays to provide a scheme which will ensure that adequate voltage is maintained at the Class IE buses under the conditions stated above. This new scheme will have the capability to transfer each 4.16 KV Class 1E bus directly to the standby power source following a SIAS. In addition, a less Of Voltage Signal (LOVS) following a SIAS will also transfer each 4.16 KV Class 1E bus directly to the standby power source instead of initially seeking the alternate preferred power source from , the companion Unit as in the existing design. 1.23 The existing LOVS trip functioin without SIAS will be unaffected by this change. With no SIAS present the existing CV-2 undervoltage relays 127F 1,127F 2,127F 3, and 127F 4 will still provide the LOVS trip upon a complete loss of voltage. This signal will still manect the affected unit to the alternate preferred power source if it is available, and then to the standby power if the alternate preferred power source is unavailable. ( 1.2.4 The degraded voltage condition will be detected by new ABB 27N undervoltage relays 127D. 1,127D 2,127D-3, and 127D-4. These relays in conjunction with timing relays (see Attachment 9.5) will initiate a degraded grid voltage signal with SIAS (DOVSS), which will l immediately transfer the 4.16 KV Class IE buses to the standby power source, during the first ; automatic load sequencing cycle only. If no degraded voltage is detected during the first automatic load sequencing cycle, timing relays will ensure that during subsequent load sequencing cycles no DOVSS will be generated. Chapter 15 of the Updated Final Safety ; Analysis Report (UFSAR) analyzed 10 semnds allowable limit from a design basis accident before standby power is available to the safety related loads. in addition, the same undervoltage relays 127D-1,127D-2,127D 3, and 127D-4 will also be used for sustained degraded voltage protection without SIAS, and annunciation of sustained i l degraded voltage condition. - This application will comply with the intent of the NRC Branch Technical Position PSB-1 , paragraph B1.
~
1J Acceptance Criteria l 1.3.1 Degraded Voltage Protection (refer to paragraph 4.12) , f' 1.3.1.1 The selection of undervoltage 127D relay setpoint shall be determined from an I analysis of the voltage requirements of the Class IE loads at all onsite system distribution levels. 1 i EMOW
CCN NOJ CALCULATION SHEET -uu. CCN No. c-l ,ao, to a CCN CONVERSON Project or DCD/MMP UNITS 2 & 3 Calc N). E4C 498. REV,9 CCN NO. CCN -
'( lut$ect 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No.
arv satsruten utt- sat mit arv eerstate matt tar mit f.*ci/s.seY os/is/s3 n. c D ine os/13/s3 13.1.2 De firs't time delay should be of a duration that established the existence of a sustained degraded voltage condition (i.e., longer than a motor starting transient). 13.13 The second time delay should be of a limited duration such that the permanently connected Class IE loads will not be damaged. Bases and justification must be provided in support of the actual delay chosen. 13.2 Loss of Voltage Protection (refer to paragraph 5.4) In order to protect motors from short time voltage dips but amid a nuisance operation of the relay, the relay should be set as follows: 13.2.1 Relays shall operate at a voltage dip for a short time period such that relay operation occurs within 15 seconds at 75% of rated motor voltage. 13.2.2 De relay should operate in 1 second to initiate automatic bus transfer following a total loss of voltage. k 1
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aaustwueux t CALCULATION SHEET Efb HO. C-l ,,,, 7as CCN CONVERSON ' i CCN NO. CCN . Project or DCS/MMP UNrrS 2 & 3 Calc N3. E4C 098. REV, O h Jt(ect 4KV SWITCHGEAR PROTECTTVE REIAY SETTING CALCULATION Sheet No. Rtv M18tMTOR Itt Mit trv M IGIMTOR Mit Mt mit M7f
$ kin / 5. Bas 06/k4/63 R.Cabing 08/13/93 1
INTENTIONALLY RESERVED t 9 9 m 8 see - ww. ,
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NES&L DEPARTMENT CALCULATION SHEET l%Eu $CN NO. C-1 mor 8 o/d i CCN CONVER$10N I Projoed or DC#/MMP .V}EJA.J., Cale No. E4C-098. REV. O CCN NO. CCN '. ( Jubject 4KV SWITCHGEAR PftOTECITVE RELAY SETTING CALCULATION Sheet No. l arv eerstaATOR a4Tr IRr MTr larV St!&!MTM MTr Itr MTr Kim / B tas 08/13/93 R. ca fa9 08/13/93 i l 2 'RESULTS/ CONCLUSIONS and RECOMMENDATIONS 2.1 - Results/ Conclusions l j 2.1.1 27N relays 127D.1,127D-2,127D.3, & 127D-4 (refer to paragraphs 8.3 & 8.5) Relay with harmonic n!ter Voltage settings: Reset (pickup) 121.40 V Dropout - 120.80 V (99.5% of reset) Time delay setting: 2 seconds e 10% (0.2 second) He relay settings are based on the System Dynamic Voltage Analysis ( reference 63) and System Steady State Voltage Analysis (reference 6.4). Derefore, these setpoints meet acceptance criterion 13.1.1. Time delay setting of 2 semnds will ensure that the relay will not cycle unnecessarily due to system transient. The r-'ay, considering relay circuit tolerance,will operate within the following voltage ranges: Reis, with harmonic Siter (tolerance 1 11 % ) Reiay 4160 V bur. voltage i Settine(V) & M Maximum reset I22.75 42 %.25 1.033 Maximum dropout 122.14 4274.90 1.028 ! Nominal reset 121.40 4249.00 1.021 Nominal dropout 120.80 4228.00 1.016 Minimum reset 120.05 4201.75 1.010 Minimuta dropout 119.45 4180.75 1.005 2.1.2 Tirmng relay settings 2.1.2.1 Timing relays 162S 1,162S-2,162S.3, & 162S-4 (refer to para. 8.5.2) Time delay setting: 4.3 seconds
- 4.5% (0.19 second)
Since the Degraded Grid Voltage Signal with a SIAS (DGVSS) should be N generated during the first automatic load sequencing cycle (refer to paragraph ( 1.2.4) and the motor staning tramient voltages are stabilized within 4 semnds, a l time delay of 43 seconds meets au:eptance criterion 13.1.2. i l SCE M Cs , PEW 430
NES&1. DEPARTMENT l CALCULATION SHEET #E 0CN NO. C-1 oao, q e l CCN CONVERSION Project or DCP/MMP _ UNITS 2 & 3 Calc No. E4C 098. REY. O CCN NO. CCN - I [ Subject 4KV S%1TCHGEAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No. j erv earstaten mit rar mir arv satsrutos mir tar mit Mt. / s.af oe/13/es n. c. $ o os/13/o3 . 2.1.2.2 Timing relays 162D 1,162D-2,162D-3, & 162D-4 (refer to para.8.53) Time delay setting: 120 seconds 210% (12 seconds) Since the Sustained Degraded Voltage Signal (SDVS) will be used for protection of the permanently connected Class IE loads from sustained degraded voltage, this timing relay may be set to operate after the automatic load sequendng operations are completed. A time delay of 120 seconds is chosen since the automatic load sequencing
, operations will take 114 secunds (reference 6.18) to mmplete. The 27N relay in mnjunction with this timing relay will generate a sustained degraded voltage signal in 120 seconds after a degraded voltage condition ocrurs. The 27N relay may not protect the motors from this short time degraded voltage conditions. .
However, the existing CV 2 relsys will protect motors from a degraded voltage as shown in paragraph 8.53.2. Therefore, this time delay meets acceptance criterion i 13.1.3. 2.1.23 Timing Relays 162T 1,162T-2,162T 3, & 162T-4 (refer to para. 5.6) Time delay setting: 1.5 seconds s' 10% (0.15 semnd) A time delay of 1.5 seconds is chosen to disable the degraded voltage detection circuit before the start of the semnd automatic load sequencing, since the DGVSS should be generated during the first automatic load sequencing, and to provide a window of suffi:: tent duration so that if the voltage at the bus drops below the 127D relay setpoint up to 1 semnd prior to the start of the voltage detection window (4.11 seconds) as 2.0 seconds delay is provided for 127D relay to establish a degraded voltage mndition before voltage detection window closes (refer to
. paragraph 5.6).
2.1.2.4 Alarm Relays 162A Tbne delay setting: 5 seconds 210% (0.5 semnd) Timing of 5 seconds was selected to provide alarm within a total of approximately 7 seconds ( 5 seconds for 162A + 2 semnds for 127D-1,2,3, & 4). 2.13 CV-2 Relays 127F 1,127F 2,127F-3, & 127F-4 (refer to para. 8.4) Voltage setting: 105 V 2 3.3% Time dial: # 1 with operating time tolerance of 2 5% CV-2 relay with 105 V tap and time dial # 1 will operate within 5 seconds at 75% of 4.16 KV ACE 26 436 NEW 4eo
NES&1. DEPARTMENT CALCULATION SHEET l'e~f$CN NO. C-1 0.c. i o o, o CCN CONVERSION Project or DC#/MMP UNITS 2 & 3 Calc No. E4C-098. REV. O CCN NO. CCN -
.ubject 4KV 5%TTCHGEAR PROTECITVE RELAY SETTING CALCU1ATION Sheet No.
arV St!$1EATOR _ aAft Itt MTE Brv ORI6fmAfot MTE IRE Mit kKim/ B. Sa 08/13/93 R. ce tag 08/13/93 motor rated voltage at 4.16 KV bus and at a voltage corresponding to 75% of 460 V rated motor voltage at 480 V bus. De relay operating time of 5 second at 75% of rated motor voltat,e meets acceptance criterion 13.2.1. His relay with 105 V tap and time dial # 1 will operate in 1 second following a total loss of voltage. His relay operating time of I second meets acceptance criterion 1.3.2.2. 2.2 Recommendations 2.2.1 He following relay settings are recommended: Relay Setting Tolerance Remarks 27N relay Rese. pickup) - 121.40V 21.11% (135 V) Relay with h (127D-1,127D-2, Dropout - 120.80 V (99.5% of reset) 21.11% (1.35 V) 127D 3, & 127D-4) Time delay - 2 seconds 210% (0.2 sec.) i CV 2 relay Voltage tap - 105 V 33% (3.465 V) (127F-1,127F-2, 127F 3, & 127F-4) Time dial- # 1 25% Timing relay 2 4.5 % (162S-1, 162S 2, Time delay - 4.3 seconds (0.19 second) 162S-3, & 162S-4) Timing relay 2 10 % (162D-1,162D.2, Time delay - 120 seconds (12 seconds) 162D 3, & 162D-4)
- Timing relay e 10%
(162T-1,162T-2, Time delay - 1.5 seconds (0.15 second) 162T-3, & 162T-4) Timing relay Time delay - 5 seconds 10 % 162A (0.5 second)
.Cc -
CALCULATION SHEET E ecu NO. c-I e.. l i e, e, 3 l CCN CONVERSION Project or DCS/MMP UNITS 2 & 3 Calc ND. E4C-098. REY. O CCN NO. CCN . ( ubject 4KV SMTTCHGEAR PROTECTTVE REIAY SETTING CALCU1ATION Sheet No. arv serstaaron mit tar mit arv earsruton mit rtr mit l
% on/ s. sY os m /93 a.c'. Mas os/13/93 l
..._ l 2.2.2 In order to limit 27N relay tolerance within 1.11%, the relay calibration tolerances should be j limited as follows:
l 2.2.2.1 Instrument The mitmeter used for calibration of the relay shall be a Fluke 45 Digital Multimeter or equal Rermace an, u.c'v: 20.2% + 10 digits 1 au sate: 300 VAC,5 digits leir.um greation 0.01V 2.2.2.7 Calibt.s.a: 3 e rc: c. The setting tolerance when setting relay trip unit voltage shall not exceed 2 0.1 V. h l 1 l l 1 It i I l 1 SCE M e m j i
,- . )
l
NES&L DEPARTMENT CCN No./
. CALCULATION SHEET *asta ecN No. c-i ... #2.o, 6 3 ccN eo,ma.,oN Project or DCS/MMP UNITS 2 & 3 Calc No. E4C-098. REY. O CCN NO. CCN - ,
( ubject 4KV SWITCHGEAR PROTECTIVE RELAY SE'TTING CALCUIATION Sheet No. ) arv MI6!MTOR _ MTE tat MTE Rtv M741MTM MTE tat Mit kKim/ B. t 08/13/93 R. Ce ing 08/13/93 i INTENTIONALLY RESERVED i l i l e O d 1 SCE 36 47L NEW 4/90 l 1
NESail. DEPARTMENT cCN NOJ CALCULATION SHEET == CCN NO. C -l ca E i s 0, c,5 CCN CONVERSION Project or DCS/MMP UNITS 2 & 3 Calc No. E4C-098. REV. 9 CCN NO. CCN * ( ubject 4KV SWITCHGEAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No, arv earsrutos mit ter mir arv enrarutoa sitt rar satt l OI ut / s. suY oe/ts/e3 n.cDine os/ts/es l 2 ASSUMPTIONS 3.1 A 3% voltage drop in the motor feeder cables is assumed for determining the minimum voltage limits at the 480 V MCC buses that would ensure 90% voltage at the motor terminals (Ref. 6.4). Consistent with the assumptions used in calculation E4C-090, the minimum voltage at the MCC bus is thus 93% (460 V x 0.93 - 427.8 V) of the motor rated voltage. 3.2 The voltage drops in the 4160 V motor feeder cables are assumed to be negligible sina calculation E4C#30 (reference 6.4) shows that the voltage drops in the motor feeder cables is 2 to 7 volts which is less than 2% of motor rated voltage. 3.3 "Ibe burden of voltage transducers TDV and TDVI which are Westinghouse Type VE2-841, Style '
, 606B299A09 (references 6.14 & 6.15) was assumed to be 2 VA based on Westinghouse Description Bulletin 43 251 for Edgewise Switchboard Instrument.
3.4 The setting tolerance used for setting the trip unit voltage is assumed to be 20.1 V. I 3.5 The voltmeter used for calibration of the relay is assumed to be a Fluke 45 Digital Multimeter. It l is also assumed that this voltmeter has been set to a user selected reading rate of 5 (medium) reading per second. 5 4 s SCE 26435 NEW 440
NES&1. DEPARTMENT CALCULATION SHEET Tu$cNN#1 ,,,,, s o, 4,.s CCN CONVERSION l CCN NO. CCN . miect or CCP/M*AP UNITS 2 & 3 Calc No. E4C-098. REV. O JDject 4KV S%1TCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. arv oarsinatoa satt rat oatt l arv entstuaron Batl !at Datt
/ b / s.pYu os/is/es a. M ia, oe/ts/s?
f DESIGN INPUT 4.1 Calculation E4C.082 ICCN C-7 (' reference 6.3) 4.1.1 Case IA of this calculation determines'the following 4160 V and 480 V bus voltages during the automatic sequencing of ESF loads immediat:ly following an accident: Voltaces based on 218 KV SWYD voltare Voltare (PU)
@4 3 Sec post accident steady state A
2A04 1.01 1.00 2A06 1.01 1.00 2B04 0.96 0.93 2B06 0.% 0.94 Voltares based on 200 KV SWYD voltsee
& Time (Sep.) Voltare (PU) 2A04 0.00 0.832 .
1.50 0.870 5.00 0.862 6.14 0.875 2A06 0.00 0.841 1.50 0.881 5.00 0.871 6.14 0.884
. s 2B04 0.00 0.614 1.54 0.693 5.00 0.762 5.00 0.6%
6.14 0.724 2B06 0.00 0.633 1.54 0.715 d 5.00 0.776 ( 5.00 0.703 6.14 0.732 , sCE 26 428 NEW 4.00
NES&L DEPARTMENT " CALCULATION SHEET EEuSC~ ~O. C-l ,,o, i r e, a CCN CONVERSION Project or DCP/MMP UNITS 2 & 3 Calc No. E4C-098. REV. O CCN NO. CCN - ( subject _4KV S%TTCHGEAR PROTECTIVE RELAY SETTING CALCULATION Sheet No. arv entstaatos mir rat mit nry oatsraatoa mit rar utg Kim / 3. Sa 08/13/93 R. ca ing 08/13/93 4.1.2 This calculation states that the minimum post trip transient SWYD voltage of 200 KV could supply power to 4.16 KV Class IE buses for up to 6.14 seconds following a major disturbance
, in the grid due to the delays of the timing relays and 27N relay (refer to Attachment 9.5),
therefore, motors in Srst (t=0 second) and the second (t=5 seconds) load groups may start with this minimum post trip transient voltage before the degraded voltage scheme transfers the ESF buses to their corresponding standby power source. Case IA of this calculation includes a dynamic simulation for the Srst and second load groups with a switchyard voltage of 200 KV. The dynamic simulation provides the following motor starting times of the first and second load groups with switchyard voltages of 200 KV and 218 KV: First load troup (t=0 second) Approx. Approx. time (sec) time (sec) D,m Lag w/218 KV w/200 KV I 2A04 2P025-A 0.67 0.93 2P017 1.0 1.67 2P307 0.67 0.83 2A06 2P025-B 0.67 0.93 2P019 1.0 1.67 2P114 0.67 0.83 , l 2B04 2P191 A 0.67 133 i 2A071 6 8.67 , 2E399 3 533 2E401 3 533 2P190 0.67 133
., 2A074 6 8.67 l 2P009 0.67 133 '
2P162 0.67 133 2B06 2P191 B 0.67 133 2A072 6 833 2E400 3 5 2E402 333 5.66 2P192 0.67 133 2A073 6 833 2P010 0.67 133 (, 2P160 0.67 1 1 SfE 26 428 NEW Also
NES&L. DEPARTMENT CALCULATION SHEET '""#CCN Re NO. c.-l ,-e i6 y 69 CCN CONVERSION Project or DC#/MMP UNITS 2 & 3 Calc No. E4C-098. REV. O CCN NO. CCN . ( lubject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCULATION Sheet No. Rtv StittMTOR MTE Itt MTE Rtv ORI6!MTM Mit Itt Mit
. Ele / B. OR/13/93 R. ca ng 08/t3/93 l
l Second load aroup (t=5 seconds) Approx. Approx. time (sec) time (sec) 3.g Lead w/218 KV w/200 KV Remarks 2A04 2P015 0.67 1 2A06 2P016 0.67 1 2B04 2E418 5 6.67 See Note 2B06 2E419 5 6.67 See Note Note: The switchyard voltage of 200 KV will last only 1.14 seconds because the degraded voltage scheme will transfer the ESF bus to the corresponding standby power source. 4.2 Calculation E4C-090 ICCN C.7 (reference 6.4) Case A14 of this calculation shows the following 4160 V and 480 V bus steady state post accident voltages: Voltares basW on 218 KV SWYD voltane
).gL, Voltane (PU) -
2A04 1.00124 2A06 , 1.00140 2B04 0.94523 2B06 0.94630 4.3 Voltage transformer at 4.16 KV Class 1E SWGRs (reference 6.14) MFR: GE Model: JVM-3 Style: 643X94 Voltage ratio: 4200-120 V,35/1 Frequency: 60 Hz (,l Accuracy class: 20.3 W, X, M, Y,1.2 Z @ 120 V
NES&L DEPARTMENT - CALCULATION SHEET Ne*EcN No. C - \ m,u ceuco .o~ Project or DCS/MMP UNTrs 2 & 3 Calc No. E4C 098. REV. g CCN NO. CCN . i utdoct 4KV SWTTCHGEAR PROTECTTVE RE1AY SETTING CALCULATION Sheet No. Rtv es!staATOR _ NTE !at NTE try entsinATOR DATE 1Rt 3Afg M ris / s. Itu 08/t3/93 m. ceMae os/ts/s3 l I 4.4 Undervoltage Relay (reference 6.8) Device No.: 127D.1, 2, 3, 4 Manufacturer: ABB i Type: 27N Catalog #: 411T5375 Pickup range: 70-120 V Dropout: 70-99% or pickup Dropout delay: 2 20 seconds Reset time: Less than 2 cycles Control voltage: 100-140 V DC. Temperature range: -30 to +70' C Burden: 0.5 VA at 120 V Repeatability tolerance: Without harmonic filter
, s. @ constant temperature & a>ntrol voltage - 20.1%
- b. For allowable de control power range (100-140V) - 20.1%
- c. Temp. range
( 20 to +55' C - 20.4% 0 to +40' C - 20.2%
-20 to +70' C - 20.7%
With harmonic filter
- a. @ constant temperature & control voltage - 20.1%
- b. For allowable de control power range (100140V) - 20.1%
- c. Temp. range O to +55' C 20.75%
+10 to +40" C - 20.4%
-20 to +70' C - 21.5% .
Notes:
- 1. Difference between pickup and dropout can be set as low as 0.5 %
- 2. The three repeatability tolerances are cumulative. The repeatability at constant temperature and constant control voltage is random tolerance. The repeatability ont allowable de control l power range and over temperature range are non-random tolerances (refer to Attachment !
9.2) l 4.5 Existing undervoltage relay at 4.16 KV Class IE SWGR (references 6.9 & 6.20) ! Device No: 127F 1,2,3, & 4 l MFR: Westinghouse [ Type: CV-2 Style No: 1875516 Volt Range: 55-140V scE 36438 NEW 490
r'- lCCN NOJ CALCULATION SHEET neuu CCN NO. C-l m , in o,61) , Project er DCS/MMP _ UNITS 2 a 3_ Cole No. E4C 098. REV. g CCN CONVERaCN CCN NO. CCP(- Subjoet 4KY EWITCHGEAR PROTECTIVE RELAY st.s i SNG CALCUIATION
' Sheet No.
arv eersta tes mit rat art arv eerstata htin/ s. Da/13/93 A.rebing 08/13/93 mit rat uit Setting: 105 V tap, I second at 120 V to 0 V Burden: 3.64 VA & 0.34 PF at 105 V tap 4.66 VA & 0.35 PF at 93 V tap Accuracy: Voltage tap - 23% Time curve - 25% 4.6 Voltmeter calibration data (Attachment 9.1) ~ Voltmeter: Fluke 45 digital multimeter Accuracy: 20.2% + 10 digits Full scale: 300 V AC Resolution: 0.01 V 4 4.7 Time delay relay (Attachment 9.6) Device No.: 1625 1, 2, 3, & 4 Manufacturer: ABB Catalog No.: 417T2170 ( Time delay range: 0.01 9.99 seconds Axuracy:
- Repeatability - 20.5 or 215ms whichever is greater.
Variation of timing with change in ambient temp. - 22% or 220ms whichever is greater for -20*C,to +70'C Variation of timing with change in control voltage . 22% or 220ms whichever is greater for -20% to,+10% voltage variation. . 4.8 Time delay relay (Attachment 9.6) Device No.: 162T-1,2,3, & 4 Manufacturer: Amerace Corp. Catalog No.: ' Agastat E7012PB Time delay range: 0.5 5 somads Accuracy: - 2 10 % 4.9
'Dae delay relay (Attachment 9.6)
Device No.: 162D 1,2,3, & 4 Manufacturer: Amerace Corp. Catalog No.: Agastat E7012PKL
'nme delay nnge: 1300 seconds Accuracy: 2 10 %
(
~^
NES&L DEPAm diENT ggy goj g CALCULATION SHEET m uu CCN =. ul .14 o, A CCN CONVERSION Project or DCS/MMP UNITS 2 & 3 Calc NA EAC 99L REV,9 CCN NO. CCN . ( Jtneet 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIAT10N Sheet No. any satssantea . mit sat uit arv sarstu fen satt sat mit ksie/ B. t 08/13/93 n.Cabag 08/13/93 4.10 Time delay relay (Attachment 9.6) i Device No.: 162A Manufacturer: Amerace Corp. ! Catalog No.: Agastat E7012PC Time delay range: 1.515 seconds , Accuracy: 2 10 % - i 4.11 Voltage requirements for motors ! SONGS Units 2&3 QC 11 motors have been procured to operate at 210% rated voltage continuously and are able to withstand voltage drops as low as 75% of rated voltage for up to 15 seconds (reference 6.19). 4.16 KV motor Continuous: ,4160 V *10% 15 seconds: 3120 V (75% of 4160 V)
. (* ,
460 V motor . [ Continuous: 460 V 210% 15 seconds: 345 V (75% of 460 V) j 4.12 The NRC Branch Technical Position PSB-1 paragraph B.1 states: ,
' In addason to the undavoltage scheme provsded to detect loss of offsite power at she Class JE buses, a second level of undervoltage protecdon with a sinw delay should also be provided to protect the Class 1E equipment, thk second level of undervohage protecdon shall sansfy she followsng cruma:
a) The selecaon of undervokage and dme delay senposnts shall be dstemunedf>om an analysir of ; the vokage repsivemenst of the Class 1E loads at all onsite system dssmbudon levels.
. l b) Two separate sme delays shall be selectedfor she second level of undervokage proercaon based v en thefollowing condadons:
- 1) The first sme delay should be of a duradon skat established she adstence of a sustaned degraded vokage condidon (Le., longer than a motor starang transient). !
Following this delay, an alarm in she conaal room should alat the operator so the degraded condstion. The subsequent occurrence of a safety injection actuanon sngnal ; (SLAS) should smmedsately separate the Class JE dsstribudon systemjham the offsite ( Powersystem-I 2) The second time delay should be of a limited duradon such that she permanentl y connected Class JE loads will not be damaged. Followsng this delay, sf the operator hat failed to restore adequate vokages, she Class JE dssabuaan system should be 4 !
NES&L DEPARTMENT gaj j CALCULATION SHEET mEuu CCN m C-1 ..o 2.00 , O l CCN CONVERSION ! Project or DCP/MMP UNITS 2 & 3 Calc No. DC 098. REV. O CCN NO. CCN -
- k. Jubject 4KV SWTTCHGEAR PROTECTIVE REL4Y SETTING CALCULATION Sheet No. ,,,
Rtv eRI4!nATOR Mit IRE Mit Rtv ORI6fRATOR MTt Itt NTE
@rt./ s. sN 0e/13/o3 R. ci@c, ce/13/s3 automatically separatedfrom the offsite power system. Bases andjusnfication must be provided in support of the actual delay chosen.
- c. De voltage sensors shall be designed to satisfy the applicable requirements de-ived from IEEE Std 2791971, ' Criteria for Protection Systems for Nuclear Power Generating Stations *:
- 1) Class 1E equipment shat! be utilized and shall be physically located at the electrically connected to the Class 1E switchgear.
- 2) An independent scheme shall be providedfor each division.
- 3) *Ihe voltage protection shallinclude :oincidence logic on a per bus basis to preclude spurious trips of the offsite power source.
- 4) The voltage sensors shall automatically initiate the disconnection of offsite power sources whenever the voltage setpoint and time delay limits (cited in item 1.22b above) have been etceeded.
4 3) Capabilityfor test and calibration during power operation shall be provided.
- 6) Annunciation must be provided in the control room for any bypasses incorporated in the design.
d) The Technical SpecifIcanons shall include kmsting conditions for operations, surveillance requirements, trip setpoints with muumum and manmum limits, and allowable values for the second level voltage protection sensors and associated time delay devices. e 1 SCE 2H26 NEW 4/30
uuswnneuw CALCULATION SHEET Ef!.CN NO. c-i .,z, a 3 CCN COWERSON Project or DCP/MMP UNITS 2 & 3 Cile N3. E4C-098. REV. O CCN NO. CCN - ubject 4KV S%1TCHGEAR PROTECTIVE REIAY SETTING CALCULATION Sheet No. _ ttV MIGIMTM BAft IRE MTE Rtv ORISIMTOR Mit IRE 3Aff htte/ t. 08/13/93 R. Ca ing 08/13/93
=
INTENTIONALLY RESERVED 9 l l i I
?
NESS L DEPARTMENT CALCULATION SHEET %"OCN NOM me. .u o,6s CCN CONVERalON Project or DCP/MMP UNITS 2 & 3 Cale No. E4C 098. REV,9 CCN NO. CCN - l Jubject 4KV SWITCHGEAR PROTECTIVE RELAY SETTING CALCULATION Sheet No. erv entstaaten utt rar att arv estarmten mit rar mit M ut. / s. M os/ts/es n.c8(ine os/ts/es I i METHODOLOGY l l 5.1 General l l Based on the results of the dynamic voltage (E4C-082, ICCN C-8) and steady state voltage (E4C- , 090, ICCN C-8) calculations,in conjunction with the sustained degraded voltage protection scheme,
- s. Calculate the total relay circuit tolerance.
- b. Determine the pickup and dropout voltage setpoints for the undervoltage relays, considering
- the relay circuit tolerance.
- c. Determine the setpoints for the time delay relays.
5.2 Relay Circuit Tolerance ( 5.2.1 Analytimi methodology A combination of the Straight. Sum and Square Root Sum of the Squares (RSS) methodologies will be utilized per SCE Standard JS 123-103C (reference 6.13) and ANSI 567.041988 (referena 6.2). 'Ihe random elements of uncertainty are combined under the . RSS methodology, and any non-random uncertainties are added algebraically (straight-sum) to the RSS result as shown below;
- a. Random, independent elements are combined by RSS methodology:
2 U = * (W2 + X + Y2 + Z2)" Where: W, X, Y, & Z are random, independent elements of uncertainty and U ,
, is the tomt unartainty. l
~
- b. Random, dependent elemenu are first combined algebraimlly according to their dependency to form new independent elemen,ts. Then, as independent elements, they are combined with other independent elements by RSS methodology as follows:
U = 2 [W2 + X2 + (Y + Z)2}" Where: Y & Z are random, dependent elements of uncertainty, W, X, and (Y + Z) are random, independent elements of uncertainty, and U is the ; total uncertainty. , ( c. Non-random element should be combined algebraically (straight sum) with the , results of the RSS computation for random, independent elements. 1 E M PEW W !
NES&L DEPARTMENT
-CALCULATION SHEET E No. C -l mog W CCN COMJERSON Project or DC3t/MMP UNITS 2 & 3 Calc No. E4C 098. REY. 9 CCN NO. CCN '-
/
( ,ubject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. l r arv m astmatos enft tar mir arv saastufen mir tar mir ! M usa / s.seE os/13/93 n. caMine os/ts/es U = 2 (W8 + X8 + Y8)" + Z Where: W, X, & Y are random, independent elements of uncertainty, Z is non- i random, and U is the total uncertainty. i 5.2.2 Relay circuit tolerance ! l Calculate the total relay circuit tolerance, considering tolerances of relay, voltage transformer (PT), voltmeter to be used for setting the relay, and voltage setting tolerance used for setting the trip unit voltage. 53 27N Relay Voltage Setpoints 53.1 Degraded grid voltage signal with SIAS (DGVSS) j,- Calculations E4C-082 (reference 6.3) and E4C-090 (reference 6.4) determined that the 218 KV switchyard voltage is the voltage required to provide adequate voltage to the accident mitigation loads only if the 4.16 KV Class 1E bus is powered from its own normal preferred power source. Since the DGVSS should be generated during the first automatic load sequencing cycle (refer to paragraph 1.2.4), obtain voltages of 4.16 KV Class IE buses 2A04 & 2A06 from calculation E4C-082 System Dynamic Voltages During Design Basis Accident, at 43 seconds (refer to Attachment 9.5) during the Erst automatic load sequencing cycle, based on 218 KV switchyard voltage and normal bus alignment. i
'Ihe 4.16 KV Class 1E bus voltages mrresponding to 218 KV switchyard voltage are considered adequate, therefore, select the relay tap such that the minimum reset ( nominal l setting - relay tolerance) of the relay is equivalent to highest of the four 4.16 KV bus voltages !
at 43 seconds. l C3oose 99.5% of the reset (pickup) voltage as the minimum dropout voltage (nominal dropout voltage - relay tolerance). Verify that this minimum dropout voltage is equal or i greater than the post accident steady state voltages. 53.2 Sustained degraded voltage signal without SIAS (SDVS) The same relay used for DGVSS fninctions, in majunction with the other timing relay (i.e. 162D1), will generate sustained degraded voltage signal (SDVS). This signal will be utilized 7 for protection of the permanently connected Class 1E loads from sustained degraded voltage k in accordance with PSB-1 paragraph B.1.(b)(2).
.C. -
CALCULATION SHEET muu CCN NO. C-1 ,, 24 sns CCN CONVERSON Project or DCP/MMP UNITS 2 & 3 C:lc N3. E4C 098. REY. O CCN NO. CCN - ubject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCU1ATION Sheet No. t' arv 9RISINATOR MTt Int MTE arv es!6! EAT 0s NTE !st aAft Kim / 8. Ba 08/t3/93 R. ca Ing 08/13/93 5.4 CV 2 Relay Setpoints in order to protect motors from short time voltage dips but avoid a nuisance operation of the relay, the relay should be set as follows: 5.4.1 The relay should operate at 75% of 4.16 kV bus voltage within 15 seconds to protect motors from short time voltage dips (refer to paragraph 4.11). ) 5.4.2 The relay should operate at a voltage corresponding to 75% of 460 V at 460 V motor terminals within 15 seconds to protect motors from short time voltage dips (refer to . paragraph 4.11). 5.4.3 TN relay should operate in 1 second to initiate automatic bus transfer following a total loss of voltage (see references 6.5 & 6.6) 5.5 Time Delay Setpoints f 5.5.1 First time delay - Timing relays 162S 1,162S 2,162S-3, & 162S-4 l
} l Time delay of this relay should be of a duration thAt established the existence of a sustained degraded voltage condition (i.e., &cnger than motor. starting transient) to satisfy the NRC Branch Technical Position PSB-1 paragraph B.1(b)(1;), as discussed in paragraph 4.12.
5.5.2 Second time delay - Timing relay 162D 1,162D-2,162D 3, & 162D-4 Since SDVS signal will be used for protection of the permanently connected Class IE loads i from sustained degraded voltage, this timing relay may be set to operate after the automatic load sequencing operations are completed. However, it should be verified that this time delay will not damage Class IE loads to satisfy the requirements of PSB 1 paragraph B.I.(b)(2), as discussed in paragraph 4.12. 55 DGVSS Timing Relays Setpoints Attachment 9.5,
- I.ogic Diagram, Class IE 4.16 kV Bus Undervoltage Detection *, shows the enhanced undervoltage detection scheme that will be in place once MMP# 2&3 -2060.00SE is installed. Purpose of this scheme was briefly described in paragraph 1.2.
Degraded witage protection requires that a DGVSS shall be initiated within first load group sequencing time of 5 seconds only. This DGVSS detection scheme is disarmed during subsequent cycles. If the voltage is above the 127D relay setpoint before the start of the second load group all the ESF loads will be sequenced onto the bus irrespective of the bus voltage during the subsequent cycles thus assuring no interruption in the middle of load sequencing. Tbc dynamic voltage calculation :hom that if the bus voltage is maintained above 4180V (relay minimum dropout voltage is selected 4180.75 V) all ESF loads will be sequenced as per design. ACE 26-426 NEW 4/30
NES&L DEPARTMENT CALCULATION SHEET secN w
== ccN Na c" oaos 25c , G 3 cCN CONWWON Project .or DCP/MMP .12HIN.2.A.E Calc No. E4C 098. REv, , cCN NO. CCN -
ut(ect 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Sheet No. arv eerstaten _ mit Ist ante arv eerstaaten mit tar att htte/ s. v 08/13/s3 a. Ca ing 08/13/s3 The time delay settings of the DOVSS timing relays 162S 1,162S 2,162SJ3.162S-4,162T-1,162T-2,162T 3,162T 4 are selected to comply with the abow consideration due to the tolerances associated with these timers, sequencing timing relays,and the response time of the 127D 1,127D 2, 127D 3,127D 4 relays. e Timing relays 162S 1.162S-2,162S-3, & 162S-4 i lead group 2 starts at 5 seconds. Sequencing ios agastat relays with 2 0.5 seconds tolerance. ! As such 162S timing should not exceed 4.5 s' conds. The ABB 62T relay has a 2 4.5% tolerance as such use a relay setting of 4.3 seconds. With this setting a DOVSS window could open earliest at 4.11 seconds and latest at 4.49 seconds to allow generation of DGVSS if , , 127D relay permits. This time delay satisfies PSB 1 paragraph B.!(b)(1) as discussed in , paragraph 4.12.
- Timing relays 162T 1,162T 2,162T 3, & 162T-4 The purpose of this timer is to disable this voltage detection circuit before the start of the load group 2. However this must also provide a window o(sufficient duration so that if the
{ voltage at the bus drops below the 127D relay setpoint up to 1 second prior to the start of the voltage detection window (4.11 seconds) as 2.0 seconds
- 10% delay is provided for 127D relay to establish a degraded voltage condition before voltage detection window closes. A delay setting of 1.5 seconds is chosen for the closure of this window so that it is not affected by the second load group load starting tranaims The time delay tolerance is 2 0.15 second. ;
With this delay in opening the earliest the window could close in 5.46 seconds (4.11 seconds i l
+ 1.5 seconds - 0.15 seconds = 5.46 seconds) and the latest the window could close in 6.14 seconds (4.49 seconds + 1.5 seconds + 0.15 seconds = 6.14 seconds).
This setting of the DOVSS window from 4.11 seconds to 6.14 seconds will detect degraded voltage in the first load group sequence and will not be affected by the sutsequent load group ESF load starting transients. ! I e Alarm Relays 162A Timing of 5 seconds was selected to provide alarm within a total of approximately 7 seconds ( 5 seconds for 162A + 2 seconds for 127D-1,2,3, & 4). NOTE: DGVSS trips 4.16kV Class 1E source breakers. Since the latest a DGVSS bus trip may be initiated at 6.14 seconds from the initiation of an SIAS all ESF loads shall be analyzed for operation with a degraded voltage condition upto 6.14 semnds. 5.7 Calculation E4C-082 ICCN C-7 (reference 6.3) identified that due to the time delays of timing ( relays and 27N relays, generation of the DGYSS could be delayed for up to 6.14 seconds, therefore, the minimum post trip transient SWYD valtage of 200 KW could supply power to the 4.16 KV Class IE buses following a major disturbance in the grid (st!fer to paragraph 4.1). Motors in first (t=0 semad) and the second (t=5 seconds) load group 6 inay start with this minimum post trip
NES&L DEPARTMENT 1 CALCULATION SHEET J
- fkN Na N nEg0,6s ,
CcN CONVERSION l Project or DCD/MMP UNITS 2 & 3 Calc No. E4C.098. REV. 3 CCN NO. CCN . ( *ubject
. 4KV SWTTCHGEAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No.
arv entsruton _ mir tar mir arv satatuton mir tar mir l T. Cut. / s. Eu ce/13/s3 a. c Uses os/ts/es I transient SWYD voltage before the degraded voltage scheme transfers the ESF buses to their corresponding standby power source. Calculation E4C-082 demonstrated the operability of the first l and second group motors with the minimum post trip transient of 200 KV in the switchyard. However, the motor starting with the voltage corresponding to the minimum post trip transient SWYD voltage takes longer time as shown in psragraph 4.1.2. This starting current could trip associated feeder breaker and lock out the breaker before the digraded voltage scheme transfers the ESF buses to their corresponding standby power source. Verify that the minimum post trip transient SWYD voltage of 200 KV in the switchyard will not cause the lockout of the associated feeder breakers of the first and second load group motors. l l I
\
t set awas NEW Also
'NES&L DEPARTMENT go, CALCULATION SHEET rana. CCN Na C-l oe r r y <. 3 CCN CONVERSON Project or DCP/MMP UNITS 2 & 3 Calc No. E4C.098. REY. g CCN NO. CCN .
Subject 4KV SWITCHGEAR PROTECTIVE REIAY SETTTNG CALCUIATION Sheet No. AtV ORI4!aATOR MTE IRE MTE REV gaI4!aAt0R MTE IRE Mit Elm / 3. Sa 08/13/93 R. Ca ing 08/1)/93 l l 1 INTENTIONALLY RESERVED l l 1 l l l l e
NESSiL DEPARTMENT ce, yo, CALCULATION SHEET wiu ecN NO. C-l .o , 2. e o ccN CONVEWON Project or DCD/MMP UNITS 2 & 3 Colc No. E4C 098. REY. 3 CCN NO. CCN - Tubject 4KV SWITCHGEAR PROTECTIVE RELAY SETTING CALCU1ATION Sheet No. arv serstaaten mit rat mit arv serstates mit tar mit OIsta/ s. auY es/13/s3 a. ceMas os/13/s3 i REFERENCES 6.1 NRC Branch Technical Position PSB 1, Adequacy of Station Electric Distribution System Voltages 6.2 ANSI S67.04-1988, Setpoint for Nuclear Safety Related Instrumentation I 6.3 E4C-082 Rev.1, ICCN Nos. C System Dynamic Voltages During Design Basis Accident. ! 6.4 E4C 090 Rev.1, ICCN Nos. C Auxiliary System Voltage Regulation 6.5 Drawing 30220 Rev. 8, Electrical Auxiliary - 4.16KV Bus 6.6 Drawing 30299 Rev.10 Electrical Auxiliary - 4.16KV Bus
, f 6.7 SO23 306-6-16, Volume ! Digital Fault Recorder System Manual, Section 1.5.5 6.8 Asea Brown Boveri information Bulletin, IB 7.4.1.7-7 issue D 6.9 Instruction Manual'41-201.4C, Type CV Voltage Relay, Westinghouse 6.10 Instruction Manual 41766.48 Types SVF, SVF-1, SVF-3, SVF 31 Relays, Westinghouse 6.11 SO23 50513, Bill of Materials - Control Panel lastruments 6.12 Drawing 31468 Rev.4, Synchronizing Potentials 6.13 SCE Standard Number JS-123-103C, Rev. 0 - Instrument Setpoint/ Loop Accuracy Calculation Methodology 6.14 SO23 302 2M, Bill of Material- 4 KV SWGR 2A04
[
- 6.15 SO23 302 2 85-3, Bill of Material - 4 KV SWGR 2A06 '
6 '16 DBD-SO23-120,' Rev.0 - 6.9 KV,4.16 KV, & 480 V Electrical systems i 6.17 Calculation E4C.050, Rev.12 - Low Voltage Power Circuit Breaker Settings 6.18 Calculation E4C 017 Rev.11 - 125 V battery DC system sizing. ! L 6.19 Speci5 cation SO23-40312 Rev.1 - Diesel Driven Electrical Generating sets 6.20 Document 90042 Rev 3 - Q.C. II Electrical St Point IJst (ESL): Units 2 and 3 I 6.21 MMP 2&3-2060.00SE - Class 1E Degraded Voltage Protection Scheme Fahancement l ses as4as Newwo i
CALCULATION SHEET 1' 7u"$CN Na C't ,,om e, g3 CCN CONYERSION Project or DCP/MMP UNrrS 2 & _3_ Calc N3. E4C-098. REV. O CCN NO. CCN - Subject 4KV SWTTCHGEAR PROTECTIVE RE!AY SETTING CALCUIATION Sheet No. trv MitfuATM DATE IRE DAtt d[Y W IGINATOR DAff IRE tdtt J. K b B. Resu 08/13/93 2. Ca 69 08/13/93 6.22 NEMA Standard MGl - Motor and Generator 6.23 ANSI Standard C37.96-1988 - AC Motor Protection 6.24 Calculation E4C-098 Rev. 0 4 KV SWOR Protective Relay Setting Calculation 6.25 Calculation E4C-099 Rev. 0 SR 480 V Power Circuit breaker Setting 6.26 Document C930813S6057, dated 8-13 SONGS Grid Stability and Voltage Study prepared by W. D. Conner of System Planning and Operation Department 9 d 1
NES&L DEPARTMENT CALCULATION SHEET , cZCu uO. C-1 cao 3 0 ,6 5 ccN CONVER$lON Project or DCP/MMP UNITS 2 & 3 Calc No. E4C 098. REV O CCN NO. CCN . ( Jbject 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCU1ATION Sheet No. arv eerst ufoa matt rat uit arv ontstaaron satt rat uit
- h. Ele / 3. Bak 08/13/93 n.CeNing 08/13/93 l
i i I PioMENCIATURES i DGVSS Degraded Grid Voltage Signal with SIAS LOVS , loss of Voltage Signal LPSI Low Pressure Safety injection PT Potential Transformer / Voltage Transformer SDVS Sustained Degraded Voltage Signal SIAS Safety injection Actuation Signal SWYD Switchyard TS Technical Specifications ! NRC Nuclear Regulatory Commission S S e ACE 36 438 NEW 440 i l 1
NES&L DEPAMTMENT CALCULATION SHEET "~Es:u
- m C-1 mont ,,6 ceu co,maa.ou Prolost or DCS/MMP UNITS 2 & 3 Calc No. E4C 998. REV,9 ccN NO. CCN -
k Ashioct 4KV.5WITCHGEAR PROTECTIVE PFt AY SETt1NG CALCU1ATION Sheet No. erv eaurmise ents ser mir arv entsraten ute tar mir Shzi./s.s.f as/n/n a. c. Dias os/n/s2 1 3 )'. VALUATION / COMPUTATIONS 8.1 Relay Circuit Tolerance t 8.1.1 27N Relay Circuit Tolerance NN Relav Tolerance (refer to Attachment 9.2) Random : Pickup and dropout settiny, repeatability at coarant temperature and constant control voltage =
- 0.1%
Non-random: Pickup and dropout settings, repeatability over allowable de control ' power range =
- 0.1%
Pickup and dropout settings, repeatability over temperature range =
- 20.4% for a relay with Harmonic Filter (HF). The ESF SWOR room !
temperature will be maintained between 50' F and 95* F during normal i and emergency operations (reference 6.16). ( e
~ Voltare transformer tolerance (refer to nara. 4.3) i 2 0.3% non. random toleranz up to Y burden (75 VA). The PT burden should be verified. ;
Voltmeter ( refer to nara. 4.6) Fluke 45 multimeter random accuracy is 2 0.2% + 10 digits Since the resolution at medium sampling rate on the 300 V range is 10 mV, the reference
. accuracy is 2(0.2% +10 0.001V) = *(0.2% + 0.1V) l If the play is set near 121 V, then 0.1 V is equivalent to about 0.083% Therefore, the ,
, random w.cf of Fluke 45 multinneter is 20.2835 Voltane settine toler== ( refer to nara. 3.41 Random w.cf 20.1 V l If the relay is set near 121 V, then 0.1 V is equivalent to about 0.0835 :
Non-random tolerance (refer to nara. 512)
- a. 27N Relay pickup and dropout setting, repeatability over allowable de control
( . power =
- 0.1%
l
- b. 27N Relay pickup and dropout setting, repeatability overtemperature range =
20.2% without HF and 20.4% with HF t i
NES&L DEPARTMENT CALCULATION SHEET *L" ecN Na c-1 c ,, % ; ccN cONVER$10N ; Project or DCS/MMP UNITS 2 & 3 Calc No. E4C 098. REV. , CCN NO. CCN . ( mblect 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCULATION Sheet No. arv earsrutos mit rat mit erv serstaten mit rat att Ele / s. 08/13/93 n. Ce tag 08/13/93 4
- c. Voltage transformer tolerance = 103%
Total non random tolerance with HF = 2(0.1 + 0.4 + 03)% = 20.8% Random tolerance (refer to nara. 5.2.2)
- a. 27N Relay pickup and dropout setting, repeatability at constant temperature and constant control witage = 20.1%
- b. Fluke 45 voltmeter = 20.283%
- c. Voltage setting tolerance = 20.083%
Total random tolerance = 2(0.18 + 0.2838 + 0.0632 )" = 2031% ' Total relav circuit tolerance Total soleranz with HF = random tolerance + non-random tolerance = 21.11% 8.1.2 CV 2 Relay ( 4.16 KV and 480 V SWGR) Circuit Tolerance CV-2 relay tolerance (refer to cara. 4.5) Random: 23% Voltare transformer tolerance (refer to or Q1 2 'J3% non. random tolerance up to Y burden G5 VA). De PT burden should be veri 5ed. Total relsy 'Arevit tolerance Total tolcrance = random + non-random = (3 + 03) = 13.J5e 8.2 Vehage Trvasformer (PT) Borden The accu,3cy of GE JVM 3 voltage transformer is 103% up to 75 VA burden (refer to 43). The con 5guration of the potential transformers yield a total burden capacity of 129.9 VA (75 VA x 2 x 0.866). i De total burden on a PT is the sum of the burdens across the individual phases: ( %=Bu+Bw+Ba I j a w a.o _______-.___-________m-__ ._ r ---
,- m -, r
NES&L DEPARTMENT
~
CALCULATION SHEET 7EufCCNNO. C -l aca30e CCN CONVERSION Project or DCS/MMP UNITS 2 & 3 Calc No. E4C-098. REV. O CCN NO. CCN - k Jubject 4KV S%TTCHGEAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No. Rrv SR!s!MTOR MTE Ist aAft arV ORIsrRATOR Mit 1st uit k Kim / B. sak 08/t3/93 R.cabbne 08/13/93 i i Bc4 = 0 since there are no loads connected across this phase. The total burden is then the sum of ! the burdens across the other two phases 4B , and B,c (refer to referenz 6.5 & Attachment 9.4) B4 , = Bm + Bai + B +B + B,i + B vai. u mass where: Ba = 2 VA 40' (refer to para. 33) Bai = 2 VA 40* (refer is jure. 33) Um = 0.288 VA 40' . (reference 6.7) Bevo = 0.5 VA 40* (reference 6.8) Bei - 2.4 VA 173* lagging (reference 6.9) Bai = 17 VA /27' lagging (reference 6.10) Batmi = (120V8 /(17 VA) 227' = 754.7Q + j384.50 @ 120V Butmi.errmes = 754.70 + J384.50 + 1060 = 860.70 + j384.50 (see note below) { Bussi.errmas = (120 V)2 /(860 +j384.5)O = 153 424.1' @ 120V BAB = 2+2+0.288+0.5+(0.7+j2.29)+(13.96+j6.25) = 19.448+j8.54 Note: The 1060 external resistor in series with the 127R residual relays has been included la the calculation of overall burden (refer to ref. 6.17). In addition, the cable impedance of the Data Acquisition Unit is mnservatively considered negligible since adding the cable impedance would reduce the overall burden. B,e = B,2 + Bna.errans + Bm stere: Buin = 2.4 VA 273* lagging (reference 6.9) Busai = 17 VA 227' lagging (reference 6.10) Barras.errmas = 153 VA 424.1* De burden caused by the synchroscope circuit, Bm mmes fmm voltage transducers, frequency transducers, and the synchroscopes. De synchroscope circuit is broken into two parts, the incoming channel and the running channel. Since the PT1, on the undervoltage circuit, can be connected to either of the channels, inmming or running,it is necessary to determine the channel with the largest burden. There is an equivalent number of transducers on either channel. However, the synchroscopes create more burden on the inmtning chaenel than the running channel. The incoming channel is, therefore, conservatively used as the limiting case for greatest circuit burden. The following instruments are fed on the incoming channel (Ref. 6.11 and 6.12): sCE 35-425 NEW MBO
-~
.-- = - . _ ,
~ _
4-l CALCULATION SHEET . CCN NO. moa h 63 l CCN CONVERSION Project er DCB/MMP UNITS 2 & 3 Calc No. E4C 498. REY. g CCN NO. CCN - l [ Sut$ect 45V SWITCHGEAR PROTECITVE REIAY SETI1NG CALCUIATION . . Sheet No. arv ersmaton satt at uit arv antarmte mit at mir k Eta / 3. su Os/13/93 n. ca ltng Os/13/93
~
Instrument ID Function Manufacturer Meds! . 2EY 16278 Voltage Transducer Scient& Columbus VT110A2 2/3 EY-1627B Voltage Transducer ScientiSc Columbus VT110A2 . 3EY 1627B Voltage Transducer ScientiSc Columbus VT110A2 25Y 1627B Freq Transducer ScientiSc Columbus 6284A 2/3 SY-1627B Freq Transducer Scienti8c Columbus 6284A 35Y-1627B Frog Transducer Scientinc Columbus 6284A 2SI 1627C Synchroscope General Electric 'AB-16 50120-452 2/3 SI 1627A Synchroscope General Electric AB 16 50-120-452 2/3 SI 1627B Synchroscope General Electric AB-16 50-120-452 3SI-1627C Synchroscope General Electric A*i-!6 50-120-452 i Therefore: Bsvwcw = (3 x Barm) + (3 x B,,som) + (4 x B-)
< where:
I ' Bar.m = 2.5 VA 40* (Attachment 93) B,,,o.m = 4 VA t0* (Attach =nt 93) B,y,o. = 4.2 VA 233.9 (Attachment 93) B,y cn = 3x2.5 VA + 3x4 VA + 4.2 VA 233.9 = 22.986 + J23425 VA Bee = 2.4 473* + 153 /24.1* + 22.986 + J23425 VA = 37.654 + jl0.885 VA I Br = Ba + Bec
= 19.448 + }8.54 + 37.654 + jl0.885 = 57.102 + jl9.424 = 6032 418.9*
, Since the burden is less than 129.9 VA. the PT inaccuracy of 103% is adequate for used in this l calculation.
t { l aceas.esNew mo JI
=t . .,. ,-.--.. , -.... ... .. . .
NES2L DEPARTMENT ,cey yo, CALCULATION SHEET raeuu ccN No. C-I ..oe afo45 , ccN CONVERSION l Project or DCp/MMP UNITS 2 & 3 Calc No. E4C.098. REV. O CCN NO. CCN - 1 ubject 4KV SMTTCHGEAR PROTECTTVE RELAY SETTING CALCUIATION Sheet No. ( try OR16 FRAT 00 MTE Ist MTE ttV se!4!RA708 MTE IRE MTE d ci. / Nuu os/ tiles R.c.eTine os/ts/e3 l 8.3 27N Relay Voltage Setpoints (refer to para. 5J) l l 83.1 System voltage dynamic analyses ( refer to para.s 4.1 & 4.2) ! Calculation E4C-082 (reference 63) determiacs the following 4160V voltages, based on 218 KV switchyard voltage, during the automatic sequencing of ESF loads immediately following a design basis accident: Voltage (PU) , I Voltage (PU) Post accident ju,1, 643 See, steady state 2A04 1.01 1.0 2A06 1.01 1.0 Calculation E4C-082 also demonstrates that system voltages, based on 218 KV switchyard voltage, are adequate for accelerating motors. 83.2 Calculation E4C-090 (reference 6.4) show the following 4160 V and 480 V bus steady state post accident voltages based on 218 KV switchyard voltage: ! S,g_,, Voltare (PU) 2A04 1.00124 2A06 1.00140 833 27N Relay with a Harmonic Filter , Given: Min. undervoltage reset (pickup) voltage at 4.16 KV - 1.010 p.u. or 4201.75 V Relay drcuit tolerance - 21.11% (refer to para. 8.1.1)
. PT ratio - 4200120 V ( refer to para. 43) 1"T secondary voltage = 4201.75 V / 35 = 120.05 V Minimum relay reset (pickup) voltage = 120.05 V (refer to paragraph 53)
Minimum relay dropout voltage = 120.05 V x 0.995 = 119.45 V Nominal relay reset (pickup) w>ltage = 120.05 V / (1-0.0111) = 121.40 V nominal relay dropout voltage = 121.40 V x 0.995 = 120.80 V f Maximum relay reset (pickup) voltage = 121.40 V x 1.0111 = 122.75 V \ Maximum relay dropout voltage = 122.75 V x 0.995 = 122.14 V sCE 26426 NEW 490
NESS:L DEPARTMENT l CALCULATION SHEET J* fecuuo. C-l o.om us s, ' ccu co,ma ,o~ Project or DCS/MMP UNITS 2 & 3 Cale No. f4C 098. ItEV. 3 CCN NO. CCN - 1 Sut$ect 4KV SWITCHGEAR PROTECTIVE REliV SETTING CALCUIATION Sheet No. arv eerstaten uit rat mir arv waarvata mit tar mir IIrt.I s. sE caits/es a, c.Eine os/is/es _ i The min. relay dropout voltage at 4.16 KV bus is 119.45 V x 35 = 4180.75 V or 1.005 p.u. ! which exceeds the post accident steady state voltages of 4.16 KV Class 1E buses shown in ' paragraph 8.3.2. i 8.4 ,- ;t 5.4) CV.2 Relay Voltage Setpoint ( refer to ; 8.4.1 4.16 KV motor In order to protect the 4.16 kV motors during a short time voltage dip, the CV-2 relay should i operate trithin 15 seconds at 75% of rated motor voltage (refer to paragraph 4.11). The voltage at the CV 2 relay corresponding in 75% of rated motor voltage: V, = (0.75 x rated motor voltage) / PT ratio f
~
= (0.75 x 4160 V) / 35 j = 89.1 V The voltage drop between 4.16 KV bus and a motor is considered negligible.
Consi(ering Relay circuit inaccuracy: V% = 89.1 V x 0.%7 = 86.16 V V, = 89.1 V x 1.033 = 92.04 V These voltages correspond to 82% and 87.65% of the existing relay tap setting (105 V),
. respectively. The custing relay (with 105 V tap and time dial #1) will operate within 5 seconds at these voltages (refer to Attachment 9.7). ,
8.4.2 460 V inotor la order to protect the 460 V motors during a short time voltage dip, the CV 2 relay should operate within 15 seconds at a voltage corresponding to 75% of the rated motor voltage (refer to paranaph 4.11). The voltage s' she CV-2 relay corresponding to 75% of rated motor voltage of 460 V: V, = [0.75 460 Vx1.03* x(4160 V/480 V)x(1.001244.94523)"] / 35
= 93.2 V i
(
- A voltage drop of 3% in the motor feeder cable was considered. ;
i The voltage drop across the loadcenter trar.sformer was considered per I t i l
NES&L DEPARTMENT gyyg CALCUl ATION SHEET raEuu CCN ~o. C-l 0.o,570,63 ' CCN CONVERSloN floject or DCS/MMP UNTTS 2 & 3 Calc E4C-098. REV. O CCN No. CCN - l %bject 4KV 5%TTCHGEAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No. \ RIV MIGINATM MTE IRE MTE arV MICINATM MTE IRE MTE
. Kim / 8. B 08/13/93 R. ca lag 08/13/93 . the voltage ratio shown in paragraph 83.2.
Considering Relay circuit inaccuracy: V, = 93.2 V x 0.%7 = 90.12 V V = 93.2 V x 1.033 = 96.27 V These voltages correspond to 85.8% and 91.68% of the exining relay tap setting (105 V), respectively. The existing relay (with 105 V tap and time dial #1) will operate within 8 seconds at these voltages (Attachment 9.7). 8.43 Attachment 9.7 shows that the existing relay (with 105 V tap and time dial # 1) will operate in 1 second followirft a total loss of voltage. 8.5 Time Delay !wtpoints 8.5.1 27N Relay \ Set the minimum time delay of 2 semnds to avoid a riuisance tripping due to a transient voltage dip. 8.5.2 Timing Relays 1625-1, 162S-2, 162S-3, & 162S-4 Since the DGVSS should be ge'nerated during the first automatic load sequencing cycle (refer to paragraph 1.2.4) and the motor starting transient voltages are stabilized within 4 seconds (Attachment 9.8), a time delay of 43 seconds selected is adequate. 8.53 Timing Relays 162D 1,162D-2,162D-3, & 162D-4 8.53.1 Sina SDVS will be used for protection of the permanently connected Class 1E
~ loads from sustained degraded voltage, this timing relay may be set to operate after
, the automatic load sequencing operations are completed.
De automatic load sequencing operations will take 117 seconds to complete sina emergency chillers E335 and E336 could start between 40 to 117 semnds (reference 6.18). Herefore, set the timing relay at 120 seconds. The undervoltage relay,in conjunction with this timing relay, will generate a sustained degraded voltage signal at 120 seconds after a degraded voltage condition oo:urs. It should be verided that this time delay of 120 seconds will not damage Class IE loads as required by PSB-1 paragraph B.1.(b)(2). f 8.53.2 Impact on Class IE motor loads due to the time delay of 120 seconds 1 8.53.2.1 It is considered that the detrimental effects of low bus voltage is more SCE 26-426 NEW 4/B0 3 - e S *e eus - e
f NEO81 DEPARTMENT , ,gj CALCULATION SHEET == ccN =0. t-1 measoams ccN cONVER$40N Project or DCS/MMP UNITS 2 & 3 Cale No. E4C-998. REV. , OcN NO. CCN - 3 Butdoct 4KV SWITCHGEAR PROTECITVE REIAY SETTING CALCUIATION Sheet No. asy ensarmten emir ut mir arv enraranten ests tar mit N. Ele / ' I. 8 08/13/93 a. ca ing 08/13/93 i critkal on motors because they will draw excessive currents under low l voltage condition. . 1 For 120 seconds after a degraded voltage condition without SIAS, the new 27 N relay may not be able to protect motors from the short time degraded voltage condition. However, the existing CV-2 relays will provide motor protection under these circumstances. 8.5.3.2.2 NEMA Standard MG1 (Referene- 5.22) recommends that the thermal ; protector be specified to limit the combination of motor and protector to an ultimate trip current not exceeding 170%,156%, sad 140% of . motor full load current rating where full load current is not exceeding . 4 9 A.between 9.1 to 20 A, and above 20 A. respectively. M otors are
~
i manufactured per NEMA Standard MG1. SONGS Units 2&3 OC II motors have been procured to operate at 210% rated voltage continuously and are able to withstand voltage drops e as low as 75% of rated voltage for up to 15 seconds (reference 6.19). ( ! ANSI Standard C37.% (reference 6.23) recommends that tbc time- : overcurrent pickup be set at 125% of full load current. Calculations E4C.096 (reference 6.24) and E4C-099 (reference 6.25) , show that time-overcurrent relays for motors are set at 125 to 140 % of motor full load current. The 125% of full load current is equivalent to a motor current at 80% ,. of rated voltage. His means that the motor can be operated at 80% ! of rated voltage. Based on data above,if the CV-2 relay can provide motor protection at 75% to 80% of rated motor voltage, the time delay of 120 seconds is
. considered adequate.
i 8.5.3.2.3 4.16 KV motor As shown in paragraph 8.4.1, the CV-2 relay (with 105 V tap and time ' ! dial #1) will operate within 5 seconds at 75% of the rated motor voltage. De voltage at the CV-2 relay corresponding to re-a of 4.16 KV motor voltage: I V, = (0.80 x rated motor voltage) / PT ratio
= (0.80 x 4160 V) / 35 ! ace as.sas NEW Wa0
NES&L DEPARTMENT CALCULATION SHEET EEeno. C-1 0,39,e3 ccuco, ou Project or DCP/MMP UNITS 2 & 3 Calc No. E4C 09L REV, e CCN No. CCN - ( hat $ect 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCU1ATION Sheet No. arv estatuten mit Ier mir arv earstaaten mit tar att J Kle / 3. u 08/13/93 n. Cabag 08/13/93
= 95.09 v De voltage drop between 4.16 KV bus and a motor is considered negligible.
Considering Relay circuit inaccuracy: V, = 95.09 V x 0.%7 = 91.95 V V, m = 95.09 V x 1.033 = 98.23 V Dese voltages correspond to 87.5% and 9335% of the existing CV 2 relay tap setting (105 V), respectively. The existing relay (with 105 V tap and time dial #1) will operate within 8 seconds at these voltages (refer to Attachment 9.7). Therefore, the CV-2 relay will provide protection to 4.16 KV motors at [ 75% to 80% of rated motor voltage. , 8.5.3.2.4 460 V motor As shown in paragraph 8.4.2, the CV-2 relay (with 105 V tap and time dial #1) will operate within 8 seconds at 75% of the rated motor voltage. De voltage at the CV 2 relay corresponding to 80% of 460 V motor voltage: V, = [0.80:460 V x 1.03x(4160V/480V)X(1.00124/0.94523)]/35
= 99.41 V A voltage d' rop of 3% in the motor feeder cable was considered.
De voltage drop across ne loadeenter transformer was considered per the voltage ratio shown in paragraph 8.3.2. Considering Relay circuit inacc.r.cy-V% = 93.86 V x 0.%7 = 90.76 V V, , = 93.86 V x 1.033 = 96.% V These voltages correspond to 46.43% and 92.34% of the existing CV 2 relay tap setting (105 V), respectively. De existing relay (witn 105 V l SCE N 428 FTW 4/a0 __m
CALCU$fdN SHEET %"ECNie. C-1 ..a o, o Project or DCD/MMP UNITS 2 & 3 Calc No. E4C 098. REV O CCN NO. CCN - i ( Jut $ect 4KV SWITCHGEAR PROTECT 1VE REIAY SETTING CAlrUIAT10N Sheet No. arv M mfstantaa aart tat enft arv earsranten satt at eart 8.rt/ s. seY[ os/ts/es n.ceUtne en/ts/es l J tap and time dial #1) will operate within 8 seconds at these voltages (refer to Attachment 9.7). 1
'!)erefore, the CV-2 relay will provide protection to 460 V motors at 1
75% to 80% of rated motor voltage. S.6 Impact on the Erst and second load group motors due to the mialanum post trip transient of 200 KV la the switchyard 8.6.1 Since motor staning impedance is constant impedance, motor staning current is proponional to motor terminal voltage. Therefore, the starting current of the motor with the minimum post trip transient of 200 KV in the switchyard must be less than its rated staning current. However, the motor staning time with the minimum post trip transient of 200 KV in the switchyard is longer than the motor starting time with the rated voltage as s50wn in paragraph 4.1.2. If the trip times of the relays or circuit breakers at the rated locked rotor currents of the associated motors are less than the motor starting times listed in paragraph 4.1.2, it is ( conservatively considered that the motor staning current with the minimum post trip transient SWYD voltage of 200 KV will nos cause the lockout of the associated feeder t breakers of the first and second load group motcrs. W 4 e
, . - . . ,s. :- . - . _ - . - --- + n- -
[ NES&L DEPARTMENT ccN NO./ I CALCULATION SHEET muu ccN e C- l noA i cAS CCN CONVERSON Project or DCS/MMP UNITS 2 as 3 Calc No. E4C 098. REV,9 CCN NO. CCN - ( 'ut(oct 4KV SWITCHGEAR PROTECTIVE REIAY SETTING CALCUIATION Shoot No. trv GRI61MTM Mit Ist Mit arv mis!Mfm Mit Itt mit k Ele / . sesu 08/13/93 R.CeDlag 08/13/93 8.6.2 Relay or circuit breaker trip time and motor starting time Tr81n A Appms. motor - Appres. Reisy / sKR sus had menes tism inp time e reied Referomoe w/200 KV (second) LRA (socoed) 2P025 A 0.93 9.0 Fig. 843 of ref. 6.24 and para. 4.1.2. 2P017 147 4.0 F"ig. 8.6.5 of ref. 6.24 and pera. 4.11 l 2P307 043 14.0 Fig. 844 of ref. 6.24 and para. 4.11 i 2P015 1.0 5.0 Fig. 84.4 of ref. 6.24 and para. 4.11 2P191 A 1.33 3.3 Fig. 8.1.9.5 of ref. 6.25 and para. e.11 8 67 I 2A071 15.0 Fig. 8.1.9 6 of ref. 6.25 and para. 4.11 I 2s04 2E399 5.33 54 Fig. 8.1.9.7 of ref 6.25 and para. 4.1.2. ( 2E401 533 54 Fig. 8.1.9.7 of ref. 6.25 and para. 4.11 I 2P190 1.33 3.3 Fig. 8.1.9.5 of ref. 6.25 and para. 4.1.2. 2A074 8.67 15 Fig. 8.1.94 of ref. 6.25 and para. 4.11 2P009 1.33 17 Atischaeot 9.9 2P16" 1.33 22 A'sh 9.9 t 2E418 6 67 5.4 ( ese nose ) Fig. 8.1.94 of ref. 6.25 and para. 4.1.2. i Note: The motor starting time with the minimum post trip transient of 200 KV in the switchyard I is longer than the masaciated circuit breaker trip time at the rated locked rotor current. ! However, the minimum post trip transient SWYD voltage of 200 KV will not cause the lockout of the assodated feeder breaker because of the following reasons: i i s Voltage at 480 V bus 2B04 corresponding to the minimum post trip transient of 200 KV is 0.614 p.m. of 480 V (refer to paragraph 4.1). l s Since motor starting current is proportional to motor terminal voltage, the motor l starting current with this voltage will be , LRA = 1.340 A (reference 6.25) l I = 1340 A z'O.614 x (1-0.03) = 798 A, considering a voltage drop of 3% on the motor feeder cable. , (
- The circuit breaker trip time at the motor starting current of 798 A is ,
approximately 16 seconds ( Figure 8.1.9.8 of reference 6.25) which is much longer than the motor starting time of 6.67 secx>nds. l see as.4a8 New 4/s0
NESOL DEPARTMENT gy woj CALCULATION SHEET muu ceu =. C-l I ao 42 63 cc~ ccm.o~ Project or DCP/MMP UNITS 2 & 3 Calc No. E4C-098. REY. 9 cCN NO. CCN - hsbject 4KV SWITCHGEAR PROTECTTVE REIAY SETTING CALCUIATION Sheet No. f ' atV 9 Aft *1st 3Att arv galttaAfta MTE Ist 3Att F(6'l ATM l IkKle/ B. Ses 08/13/93 R. Ca ng 08/13/93 8.6.3 As shown in paragraph 4.1.2, motor startinr times of the first and second group motors for ; Train B are very similar to the motor starting times for Train A. Calculations E4C 098 i (reference 6.24) and E4C-099 (reference 6.25) show that the relay breaker settings of Train - i B are the same as those of Train A for the same type ofloads. Therefore, it is concluded that the motor starting current with the minimum post trip transient SWYD voltage of 200 KV will not cause the lockout of the associated feeder breakers of the first and second load group motors without analyses for Train B. l l 1 i e ( .,
Sca *c-e een wo c.I daar 44 ee [oS ccn convem
~ '
ceu no ccN . ATTACHMENT 9.1 ( Sheet CALCULATION NO. E4Cm REV. O ICCN C-1
. Page l of 4 Appendix A Specifications INTRODUC710N .
Appendix A contains the speci5cadons of the Fluke 45 Dual Display Muldmeter. , These specifmations assume: e A 1. year calibration cycle e An operadag temperature of 18 to ab d(fi4 tr,32.4*F) (
- Reladvs hunddity not exceeding 90% (non-condcasing)(70% for 1,000 kn range and above)
Accuracy is expressed as 1(percentage of tsading
- digit:K I
- f k
. \ A.1 y a 4 # _ m.- _ _ _ _ _ _ _ _ . _
i
, L3S&L DEPARTMENT gg goj i CALCULATION SHEET == CCN uo. C-1 aos 4 30, f.3 I CCN CONVERSION i Project or DCS/MMP UNITS 2 & 3 Calc No. E4C-098. REV. O CCN NO. CCN -
)
1 q iubject 4KV S%TrCHGEAR PROTECTTVE RELAY SE"ITING CALCULATION Sheet No. 1 Rtv SRI 4!NATOR , Mit IRf MTE Rtv ORI4!nATOR MTE !RE Mit h.Kim/ I. B 08/13/93 R. Ca ing 08/13/93 1! 2 ATTACHMENTS 9.1 Appendix A Specifications - Fluke 45 Dual Display Multimeter. 9.2 Telephone Note between J. Kim of SCE and C. Downs of ABB, dated July 9,1993. 9.3 Data sheets for Scientific columbus Transducer and General Electric Synchroscope. 9.4 PT foading configuration 9.5 SONGS 2 & 3 Logic Diagram Class 1E 4.16 KV bus undervoltage Detection 9.6 Time delay relays - Agastat E7000 and ABB type 62T , 9.7 CV 2 Undervoltage Relay, Typical Time Curve 9.8 SONGS 2&3 System Dynamic Voltage During Design Basis Accident ( 9.9 MCC Breaker Trip Curves. 1 ( sCE 26 426 NEW 490
ccn m.
==Euu ceu wo C-l o,.,4 f o, r,3 ccw ccmannow
. . ces so cCN .
ATTACHMENT 9.1 : i Sheet CALCUl.ATION No. E4C.098 REV. O ICCN C.1 ' SPECIPICAfl0NS - DC V.%TAes Page 1 of 4 l P i DespLAY COUNTS Ale READest RAT 88 Asse g posenge per Sesome l Pd Range Deser Counce l Sew 3.5 to 900* , nessum a inenn , Feet 30 1000
+ onme twa rence inn n,.ceny se sam 0 counta j i'
f RS 333 ANO 1E58 488 READING TRANSPER RATES I Aseeing per sesens i Rete internet Trigger Operetten internel Trigger Operellen PHnt Mose operation 1 (Tl#00ER 1) (TR100ER di farint est et il f Sism aJ 1.5 LS , Medwn as 2.4 5.0 l i'
- Feet 4J 3.8 133 Anspeansflase Astere Gessen 4 tar emedesinsomumen DC,VOL1aAE
. i
~
Asesheen Assumer
- '8'"8' goe assess Post 8 teenmal (1 Yes4 480% + 3 i 300 e# - 10 W 100 W 885% + 3 SV - te0 W 1 seV 45%+t 4M0%+3 ,
SW to# 10 e# 8M% + 3 450% + 3 300V - te oW im mV Amt + 3 48894*1 1MW - 100 mV 1V 8506 + 3 450% + 2 Sees # 1W - - 480% + 4 4800% + 0 10M o# 18 W - - 4m% + 8 . 430%+0 , SOV 100 W = = B5% + 6 SMS%+6 tegV tow - - SAft + 8 tagem + 8 1GIOV 10 oW - - 68E% + 6 8JB9% + 8 {'- s A.8
8CCN NOJ PaEW CCN NO C-1 CAGE h3 os 03 ccN cONvrasoN CCN NO CCN -
< ATTACHMENT 9. S Sheet CALCULATION NO. E4C-098 REV. O ICCN C 1 Page I of 3 EXCELTRONIC" CURRENT and VOLTAGE TRANSDUCERS -
- .
- :r:-'
- 3. nae ,m, Accuracy 0.1%0.25*'e reene e.e nrters DESCRIPTION 'isom as average unwng sevien caeibretu .a nns Escenronec current and voltage transoucers are manufac- or as true rms units. ether witft a oc currerst output propor.
tional to the input. tured to tne same M.gh standares of the watt and vor series. In acastion to tneer neon accuracies (z O 25% anc : 0.1%). they have features sucn as minimal space recuerements. 3 The ec outout es a constant current of 0 1 mA wruch. well more into any haea from 0 10.000 onms. These outputs
, an I packaging, and ensustap#e gain potentiometers.
are also fetteres Mesistance variations en the segnal sooo. over the range of 0 to a4000 ohms, so not cause any sevia. ScWntific Coeumous' Current and vastage franseucers tion from statec accuracy. #
/ Sing s.1 PACxAGE
.p *.
J. SfvLEuPACKAGE ( Ctit0A2 does (3 in e Cureente CTS 10A4 vt110A2 s* acts . mus
.* 3sa7
- RMS VTI10A4 3 sat (3 en a Womaget SPECIFICATIONS q.a sus asse nas Meees Cili 0A3 CT$ lead 4074 Meeel WTit6A2 VTitSA4 3947 Fun Scase Careent 9e *
- Fun Staae venage 150 y *
- sureen 025VA . . fe.mmes v.nage 12e v 4 6 2sA Owenoes 100. *
- o '*a -
intr;l?;;;" ,g",e, .u.een e in v e i v. - t o.. Feuevency Aence to a $ 844 F,eeweacy Range to og (So.o yr nomenen # too Ha
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n'o'c' E mum ts en As fam.ur.rmum ev e 0 9% . . Accuracy t% no @
C to to tto y se Accuracy p W C N.m n naserecuencyl t 0 29% v' O t% 3 029% f% Mo as neaunas ou,,,, ,
'resuency: e 0 29% 09% v 0 29% en,,, ,, ,e ,nye,
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sCCse neo W CCN W b! C OE N C# 0 3 ccu couvons o.e ccN No CCN . , i ATTACHMENT 9.I Sheet CN.CULATION NO. E4C.098 REV. O ICCN C.1 Page3of4 SPSC1FICAYiONS - DC VOLTAGE input imposense 10 MO m perwid we <100 or MTE 6e sie nuet goeder mese, enen m vens se enef vom er 4#icteas are sedecase, eie to Mt3 es w n -e e nerow -e se s un se ev. Idensel Mese Reiseems mees - 1 m a e so - ec s .o.w ne se . msei w e. w so.4e0=.e.w unrse De0 se et 90 Ms. seen reas peste; Feel fJes hee no emanng) Membe.se AteweMe AC Wesege WhAs hemg DC Weenge (
.seR.e.eMe ,ees No e, Me.e .g e, Reage Peek AC venage alMAR* >et att Nt0RR >00ett 300 mV 100 mV 30V iSV iSV 3V 1000 mV 3W iSV SIV 30V 10V 1000V $0V 300V 300V 100V 1000V SW 200V 1000V 1000V 1000V 300V 1000V
- NMAR is gne Nonnel Mese Re6eseen Rees
? Norme, Mese Reposeen Rees et 30 w 00 Me 2 0.1%
Casseen Reisease Rees
. m . .s. m w = = n ia - e.e w .e- es.
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- 1000V es y peak as en e,y swise 9
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ICCN NO. MEUM. CCN NO 'l CAGEkb08 b3
, .. CCN COMEMION CCN NO. CCN .
ATTACHMENT 9.1 l( Sheet i CAI.CUI ATION No. E4C 098 REV. O ICCN C 1 Page l of g t i i TELEPHONE NOTES 4 BY Joon Kim OF SCE TELEPHONE NO. (7141587-5501 e WITH Clifford Downs OF ABB . TELEPHONE NO. (2151395-7333 l I DATE: Julv 9.1993
SUBJECT:
ABB 27N Relav Tolerance
REFERENCE:
ABB Instructions IB 7.4.1.7-7 DISCUSSION AND AGREEMENTS REACHED: - ! Mr. Downs was asked to clarify which tolerance is random element for the pickup and dropout setting repeatability tolerances listed in ABB instructions IB 7.4.1.7-7. Mr. Downs stated as follows: Random : Pickup and dropout settings, repeatability at constant temperature and constant control voltage i
- 1. Pickup and dropout settings, repeatability over allowable de Non random:
l control power range , I
- 2. Pickup and dropout settings, repeatability over semperature range.
( l
I CCN Nos PREUM. CCN NO. b CAGE 47 or S 3
. . cCu CouvEns.ou cCu no ccu -
\ ATTACHMENT 9. I Sheet CALCULATION NO. E4C 098 REV. O ICCN C 1 SPECIFICATIONS-TRUE AMS ACVOLTAGE Titus Aset AC VOLTASE AC COUPLSD mesesseen Aange gi,, l neesium l Past 300 mV -
10uV 100uV W - 100 W 1 mV 30V - 1mV to mv supV - 10 mV 100 mv 730V - 100 mV SV
. 100 mv 1# - -
tecmv 10 W - - 1W 100W - - 100v 1mV - - 76W 10 snv - - Asemesy thest Ameweer deAseweer enemin,u a I I see Itemen Past gav/taed Past U888' M ' B 80 Mt 1% + 35 1%
- to 7% + 3 til E73 M + 10 790 V 00 Me 10 IsHs OM
- 100 0J06 + 10 AM + 3 400 tif 4A46+10 ?$0 V 10 30 eMe AM + 100 SAI6
- 10 4846 + 3 Ett E17 1% + 10 790 V SS 80 tMr 346*300 M*N M*3 43 434 du
- 30 400 V 00100 kHz 546*SW M+5 M+8 &?O 478 1946 + 30 300 V
- Greer in power made we not essess omse sie unser seawney speetesten Arawet; speedesamte apply weln Its isAsu4ig tmer, teesd en meeng rest Menen Auseig Anna esseeen tA00 ens 34000 eewes M senget f W Ame eig Roer Betecen 100 sw 3A00 couns M arest .
DeshdRamshmen
- i
. Anastueen mes & Neese Fest 401 st 11 80 t
t : I A-4 ____ _ _ _____i
[ ) iCCN NO ) PRELtM CCN NO. ("f q fcy 7 g, 3 ccN convens ON ccnNO CCN. ; ( ' ATTACHhiENT 9. S ! Sheet l l CALCULATION NO. E4C 098 REV. O ICCN C 1 ) Pagee t of S !
- W- '
EXCELTRONIC" i
- s. a FREQUENCY TR.AN..S.DUCERS . 4 mi ....CosumDue constant current output the means. for a seven DESCRIPTION enput, no salu6 tenent es necessary to compensate for were.
Scienhfic Columous Frecuency Transducers oevelop a out output signal toop characionatics. DC output segnai nnich es proportional to enput trecuency. Series components and eences such as moscators. These transoucers have an espanded scale output A recorders. res4 tors for alarms and analog to 4*gital' peck. wareely of CahDrations may De ordered or the user enay off points can be aoded to the output sognet circuit wimout cah0 rate the transducer et the enstallation site to meet spe- recahDrating these transducers. Filtering es also encluOed cif*C reouirernents. erhach temphfies mettfung these veuts to fast response 9e- g these trans0ucefs feature the exceptional Scientific eces.
$PECIFICATIONS areas esees eseis eneut venage 120 v 120W '70 V !
tso V tso V 1s0 V o.orises 3y642$ M 5644 Ma Frecuency Aange se,as Mg C*I ma ime 4> TON enme S e me snee O 1OK ansne , ovieut 0 I ma enee O ION shme Accuracy e 0 oP6 of : 0 02% of a 0.02% of Conw treeveney at tf C Camer ereeuency at af C Cen* 'reousaey at af C Amenent Temeerature ENect on Accurney : 00o29% fC tasa s 0 0029%f C edes. s 0 00thf C hasa. Acevoimente Zero.Sean Zero.Sean Zero.Sean Sureen 8vA 8VA
~
n.eeie 1% mesimum outui seek t% massmum eugut poet 'V"maa t% mum euwut meet
- Temperstore Range -0.2F ee C. t.o
.eteense em+ st,Ci.n . v. 0.2F C to + et Csee to=c. e =e en unea nam ecuemu. 0.If C se + GF C Conn.ei. ens - e.eese Ceaneci.en m eunae.no = o e er s, vie a Cm SHUNT / ISOLATION / AMPLIFIER u.a.i uT1 A DESCRIPTION A SWaven zero and gem assustment es provised and is accessiD6e through the too cover. Large gem changes can the Mocol $271 A Shont Amplifier es a knear emphfie' t>e accomphshed by changsng the musikary gain rosestor cesigned to amputy DC shunt melhvolt segnats or D C. volt
- across termenats 3 and 4.
ages from 50 MV to 1000 V C C.. and provoes compwre asotation of the input segnel A magnetic amphfier es used in SPECIFICATIONS the input circuit to isolate the enput from est other cercuits , ,, , , , and groumos the mput es tested at e000 sorts D C. for one 3,,,,,,,,,,,,,,,,,, ,,,, ,,,,,,,,,,,, menute to ensure that no greakcown enal occur when con- 5.gnei ene,t sange opteens 30 esy to t000 W D C. netted to snunts operat.ng et high voltage levets eDove eneut smoseance 5000 enme/ Vest ground The output cercuet es e feytrid amphfier coeratsng m Dugue O C. e to s I ma the transconductance mode to pronse a constant current (*",emposence %eseMO C output. Load ressetence variations from 010K have less g,mee,es,,e . sy C le . 7F C than 0 t*. effect on she output current. Thee makes the temperature caens 0 0s% C emphfier en seest eence for estemetermg. scakng. record- Sase 3" a ete" a 4%e" **gh caense.no seyw a semia# Cam eng appheations or metenmg to tone trenametters or A lo O convw ws rne09:09: e meo filtered.thus maung e= pen. Connect,.ne pe.e se cemene.eneem seee., save fettering unnecessary Conneceen ato Seyne a Cass
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1 l CDM FILE I C9308138f9_56 SONGS GRID STABILITY AND i VOLTAGE STUDY ; I LETTER FROM ROMULO F. BARRENO TO B. CARLISLE DATED AUGUST 9, 1993 I l l i I l I 1 I I
g-...........----- 1 August 9,1993 9 kl@00$0? I l
,, hUIi S.* M L B. CARI lSLE BERNIE CARUS.E Ei3]ECT: SONGS Grid Voltare Study l
l 1 In your letter of November 25,1993, you requested, on behalf of Nuclear Engineering Design Organization (NEDO), that System Operation perform an operating study to determine if voltage at the San Onofre Nuclear Generating Station (SONGS) 230kV bus can be maintained at the minimum 218kV level, under conditions specified by your organization, in the absence of SONGS Unit No.1 (which was taken permanently out of service). I l Don Conner of System Operation has completed the requested study and prepared a report, which is attached for your information. As you know, the results of this study have been reviewed in several meetings between System Operation, NEDO and System Planning. The repon includes comments received from the different parties involved in the review process. The study was performed under guidelines prepared jointly by System Operation and NEDO. The following four scenarios v.ere investigated: g 1. Scenario 1 is the case when one SONGS unit is off-line, and the remaining SONGS unit trips.
- 2. Scenario 2 is the case where both SONGS units are on-line, and both units trip following a fault.
3 Scenario 3 is the case where one SONGS unit is off-line, one SONGS unit remains on-line, and critical 230/500kV line(s)/ bus is lost.
- 4. Scenario 4 is the case where one SONGS unit is off-line, and the remaining SONGS unit trips after the loss of critical 230/500kV line(s)/ bus.
Scenario I resulted in marginally adequate voltage at SONGS. An operating procedure to curtail transmission service to SDG&E under cenain conditions was implemented (SDG&E is a pan owner of SONGS) to achieve adequate voltage at SONGS. Scenario 2 resulted in inadequate voltage at SONGS. Scensde ? nsulted in adequate voltage conditions at SONGS. Scenario 4 resulted in inadequate voltage conditions at SONGS for several unlikely events . ( studied under this scenario (please refer to the repon for detailed description of the events I studied). System Operation, with the agreement of the review panies, has implemented an operating procedure to monitor system conditions so that Nuclear Engineering is informed of conditions leading to inadequate voltage at SONGS.
B. Certisle !cte 2 Acturt 9,199.1 I understand NEDO is developing a relay scheme to protect SONGS for the undervoltages resulting from unlikely contia+r ies studied in Scenarios 2 and 4. Monitoring of operating conditions and the corresponding operating procedure will remain in place until this relay scheme is implemented or until facilities to prevent low voltage at SONGS are added to the system, whichever occurs first. This repon completes our response to your request. If you have any questions, please do not besitate to call Don Conner at PAX 21671 or me at PAX 29588. 2 ~/ hff?--- ROMULO F. BARRENO Attachment i ec: J. W. Ballance W. H. Borgardt W. D. Conner J. D. Dyer . Q. S. Hendricks A. T. Kaneko M. Kondragunta J. G. Kritikson M. D. Lopez T. S. Ning A. J. Perez D. G. Stickney . G. S. Tarplee . ii.a."E 9 9 0 9 E P!
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I t CDM FILE 4 C93081386057 l 1 i SONGS GRID STABILITY AND VOLTAGE STUDY ! BY W.D. CONNER DATED JULY 30, 1993 WITH SUPPLEMENT - ECC OPERATING PROCEDURE: MIRA LONA 500KV ' NORTH BUS OUTAGE (SCENARIO 4E) BY ( W.D. CONNER DATED NOVEMBER 2, 1993 l 1 l 1 l
nye ' o ( SONGS GRID STABILITY AND VOLTAGE STUDY i
, July 30,1993 1
1 1 I Prepared by - W. D. Conner System Operation for l Nuclear Engineering l i ) l 1
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I, EXECUTIVE
SUMMARY
l [ INTRODUCTION At the request of the Nuclear Engineering Design Organization (NEDO), a grid stability and voltage study was performed for the SONGS units. The purpose of the study was to determine the impact each of four pre-defined Scenarios (see Attachment 1) woud have on the stability and on the SONGS 230kV switchyard voltage (minimum analyzed SONGS switchyard voltage - 218kV). This study considers worst case contingencies on both the SCE and SDG&E systems within the guidelines established by NEDO (Attachment 1). This report documents the results of this study.
SUMMARY
OF SCENARIOS ' Scenario 1 is the case when one SONGS unit is off line, and the remaining SONGS unit trips due to a design basis accident. Scenario 2 is the case where both SONGS units are on line, and both units trip , under non accident conditions following a fault on the grid.
- Scenario 3 is the case where one SONGS unit is off-line, one SONGS unit !
remains on line, and critical 230/500kV line(s)/ bus is lost. Scenario 4 is the case where one SONGS unit is off line, and the remaining - l SONGS unit trips due to a design basis accident after the loss of critical l 230/500kV line(s)/ bus. ;
/
The statlan load for each SONG 9 unit used in this study is assumed to be 80 MW,45 MVARS. These ( maximum values were provided by NEDO-Electrical and represent bounding conditions for either a normal or post accident shutdown condition. FINDINGS A. Under Scenario 1, the SONGS voltage did not recover to 218kV when the remaining SONGS unit trips while under heavy Sd Area Load conditions. If 200 MW of firm transmission service to SDG&E is curtailed, the voltage recovers to 218kV. B. Under Scenario 2, the SONGS voltage does not recover to 218kV whwn both units trip simultaneously under heavy load conditions. > C. Scenario 3 does not pose a problem to the SONGS 230kV switchyard voltage, as the voltage recovers to 218kV and above for all contingencies. No corrective action is l needed. h D. Under Scenario 4, six contingencies were identified in which the SONGS voltage did l not recover to 218kV. ! An ECC operating procedure has been established to deal with the potential low SONGS voltage conditions found in Scenario 4. The procedure is designed to monitor system operating conditions which can lead to inadequate voltage at SONGS (less than f 218kV). Whenever a SONGS unit is off-line and a critical line is lost while the SCE ; g Area Load is above pre-determined threshold level, the ECC will notify SONGS of the '. Inoperable status of the SONGS off site power source (defined by NEDO as that condition under which the system is unable to support SONGS voltage at 218kV if the remaining unit trips). SONGS will then enter the appropriate Technical Specification action statement and take any necessary action.
~ . - . _
CONCLUSIONS Dependable voltage. is sustain:d at SONGS under Scznnrio 1 with an ECC cparating pr:cIdure which
, curtails up to 200 MW of SDG&E imports under predetermined operating condition.
I Under Scenario 2, the SONGS voltage does not recover to 218kV when b6th units trip simultaneously. NEDO is designing a relay scheme for SONGS which will compensate W the undervottage condition found in Scenario 2. Under Scenario 3, the SONG'S switchyard voltage recovers to 218kV and above following system disturbances. No corrective action is required. Under Scenario 4, the SONGS switchyard voltage does not recover to 218kV. Though studies show that 218kV voltage can be attained following disturbances by tripping various amounts of load, this attemative is not being considered due to the very low probability of such events happenino. As a more desirable altamative, NEDO is presently developing a relay scheme for SONGS which will protect SONGS for the undervoltages found in the contingencies studied in Scenario 4, as well as Scenario 2 (WR 2060). In the meantime, an ECC operating procedure has been developed to monitor system conditions which l can lead to inadequate voltage at SONGS. Under the procedure, whenever a SONGS unit is off-line and a criticalline is lost while the SCE Area Load is above the threshold level, the ECC will notify SONGS ' of the inoperable status of the SONGS off-site power source (unable to support SONGS voltage at 218kV if the remaining unit trips). SONGS will then enter the appropriate technical specification action statement and take any required action. The Scenario 4 procedure will remain in effect until NEDO and System Operation decide it is no longer necessary to monitor system conditions because either new < facilities are added as long term soletions or automatic tripping / relay schemes are implemented to protect against inadequate voltages at the SONGS switchyard. - l i i 4 ( 2-
II, OUTLINE FOR SONGS GRID STABILITY AND VOLTAGE STUDIES INTRODUCTION ( These studies, completed at the request of NEDO, were performed to ensure that voltage conditions at the SONGS switchyard are adequate at all times to respond to an accident scenario such as a Loss of Coolant Accident (LOCA). Critical system conditions studied were jointly determined with NEDO. Once results of power flow and stabihty analysis became known, an operating procedure was developed by System Operation and approved in joint meetings with NEDO and System Planning. This procedure, described in this report, is now in place. A corrective measure, involving a tripping scheme at SONGS, is presently being developed by NEDO. This scheme will protect SONGS against potential low voltages that could be caused by certain events identified in M report. Based on guidelines prepared by NEDO (see Attachment 1) System Operation prepared an outline for the SONGS Grid Stability and Voltage Study. This outline, shown below, was the basis for the study and describes the assumptions, scenarios, system representation and study procedure used in the study. GENERAL ASSUMPTIONS ,
- 1. SONGS Unit 1 is permanently shut down. , .
- 2. Peak summer loads are mooeled in system representation. (See Tables 2 3 for a ~
description of the area interchange and MW/MVAR ratios modeled in the system representation.) . 3. Each on-line SONGS unit is capable of generating a maximum of 1160 MW and i 550 MVAR.
- 4. A total auxiliary load of 160 MW and 90 MVAR at SONGS (80 MW and 45 MVAR at each of Units 2 and 3 -- bounding values for all modes of normal and post-accident operation.
STUDY SCENARIOS The four study scenar;os to be evaluated are desenbod in Attachment 1. SYSTEM REPRESENTATION The basis for the system representation is the WSCC 1991 HS3 case. The Area Interchange Sheets for the SCE/ MWD and SDG&E areas in this case are shown in Table 2. The WSCC 1991 HS3 base case was modified to represent SONGS 1 off line and approximate load levels of 18,300 MW and 3,300 MW for the Southem Califomia and San Diego control areas, respectively, which represent the estimated 1993 peak conditions. Additionalload levels for the Southern California and San D ogo control areas will be evaluated as required. For the load level shown above, the following base case will be developed: Case A: SONGS 2 and 3 On-Line [
- Seven percent spinning reserve in both areas.
MW:MVAR ratios for SCE area as shown in Table 3.
- No cold stand-by units or peakers on-line in SCE area.
OF generation in SCE area equivalent to generation on-line at time of 1992 system peak. Goes 3: SONGS 3 On-Line Adjust Case A by r: moving g:neration cutput cf SONGS 2 cnd r:-adjusting generation in both Southern Califomia and San Diego control areas for loss of , SONGS 2 to achieve spinning reserve levels between five and seven percent in each of these areas. ,
- Utilize oil and gas units betsre peakers.
- Do not utilize cold. standby units. ;
Convert economy purchases to short-term firm imports if required to achieve spinning reserve objectives once all available oil and gas units and peakers have been brought on-line. i STUDY PROCEDURE At heavy load levels, perform evaluation of conditions outlined in Attachment 1 by utilizing the following , power flow and stability set-ups. i Scenarlo 1
- 1. Power Flow t 4 Modify Case B by removing generation output from SONGS,3.
Adjust generation in Southem California and San Diego control areas - by " leaning" on interties proportionately accordint '.o area load.
- 2. Stability f
( '
- Use Case B as a history file.
- At time =0, trip SONGS 3 (no fault).
- Run program for 10 seconds.
- 3. Re-run power flow with SONGS 1 on line fa maximum load level condition.
Scenario 2
- 1. Power Flow
. Modify Case A by removing generation oLW from both SONGS 2 '
l and 3.
- A4ust generation in Southern Califomia and San Diego control areas by " leaning" on interties proportionately according to area load.
- 2. Stability
- Use Case A as a history file.
- At time =0+, apply three-phase fault near the San Onofre 230kV bus.
> = Clear this fault in five cycles and trip SONGS 2 and 3 concurrently.
- Run program for 10 seconds.
- 3. Re-run power flow v:'th SONGS 1 on-line for maximum load condition.
Scenerfo 3 .
- 1. Power Flow ,
[ Study Case B with the following contingencies (taken one at a time):
- a. Loss of Mira Loma Serrano and Lugo-Serrano 500kV lines.
- b. Lost of Lugo-Mira Loma Nos. 2 and 3 500kV lines.
- c. Loss of Ellis Johanna and Ellis-Santiago 230kV lines.
- d. Loss of imperial Valley-Miguel 500kV line and Imperial '
Valley La Rosita 230kV line.
- e. Loss of 500kV bus at Mira Loma Substation. 1 l
- f. Loss of Palo Verde-Devers 500kV line. ;
- 2. Stability l
1 Use Case B as a history file. ) For each contingency listed above, apply a these-phase fault at the l common bus or bus nearest San Onofre if a common bus is not shared. Clear this fault in five cycles and four cycles for the 230kV , and 500kV lines, respectively, and open the lines involved in the i contingency. -
. Run program for 10 seconds.
i l l
,/ Scenario 4 l
l
- 1. Power Flow <
Modify Case B by modeling each contingency listed in Scenario 3 separately and removing the generation output from SONGS 3. Adjust generation in Southern Califomia and San Diego control areas by " leaning" on interties proportionately according to area load.
- 2. StabiliN Use Case B as a history file.
For each contingency listed in Scenario 3, apply a three-phase fault
~ at the common bus or bus nearest San Onofra if a common bus is not shared. Clear this fault in five cycles and four cycles for the 230kV and 500kV lines, respectively, and open the lines involved in the contingency. One cycle later, trip SONGS 3 (no fault).
. Run program for 10 seconds.
- 3. Re run power flow with SONGS 1 on-line for maximum load level condition.
I
lli, STUDY RESULTS [ The SONGS Grid Stability and Voltage Study Results are shown in Table 1. Shown below is a description of the study results for each Scenario (stability plots are shown in Attachment 2): Scenario 1 I Under Scenario 1 one SONGS untiis out of service and in Mode 3 (40 MW,45 MVAR), and the remaining SONGS unit in Mode 1 (80 MW,45 MVAR) trips. The SCE grid is stable. The minimum post trip transient voltage at the SONGS switchyard is 208kV, and the steady state voltage recovers to 217.2kV in about 2.5 seconds. In order for the voltage to recover to 218kV, the maximum allowable SCE load (threshold) should be 17,900 MW. If SONGS Unit I were on-line in this scenwio, the SONGS steady state voltage would be 223kV. Curtailing up to 200 MW of SDG&E power imports willinsure that 218kV is maintained at SONGS for ioss of the remaining SONGS generating unit. . Scenario 2 - Under Scenario 2, both SONGS units are in service in Mode 1 (80 MW,45 MVAR), a 3-phase fault is applied extemal to the SONGS 230kV switchyard, and both SONGS 2 and - 3 trip concurrently. . The SCE grid remains stable. The minimum post-trip transient voltage at the SONGS
/
switchyard is 191kV, and the steady state voltage recovers to 214.7kV in about 2 I seconds. In order for the voltage to recover to 218kV, the maximum allowable SCE load (threshold) should be 15,600 MW. If . SONGS Unit 1 were on-line in this scenario, the SONGS steady state voltace would be 221kV. In order to maintain 218kV for loss of both SONGS units simultaneously without SONGS 1, about 540 MW of load needs to be shed at Santiago for Scenario 2. . i Scenario 3 Under Scenario 3, one SONGS unit is off-line in Mode 3 (80 MW,.45 MVAR), the remaining SONGS unit is on-line in Mode 1 (80 MW,45 MVAR), and a critical 230/500kV line(s)/ bus trips as shown below: Case A The dira Loma Serrano and Lugo Serrano 500kV lines trip for Case A. The SCE grid remains stable. The minimum post trip transient voltage at the
, SONG switchyard is 217.6kV, and the steady-state voltage recovers to 218kV in about 2 seconds. The steady state voltage at the SONGS switchyard is 228kV.
CasoB
'he .ugo Mira Loma 2 and 3 500kV lines trip for Case B.
r The SCE grid remains stele. The minimum post-trip transient voltage at the SONGS switchyard is 210.5kV an.1 recovers 10 218kV in about 2 seconds. The steady state voltage at the SONO)S switchyard is 226.7kV.
Case C The Elus Johanna and Ellis-Santiago 230kV lines trip fsr Case C. f The SdE grid ' remains stable. The minimum post-trip transient voltage at the . SONGS switchyard is 217.5kV, and the steady state voltage recovers to 218kV t in about 2 seconds. The steady state voltage at the SONGS switchyard is 227.3kV. , Case D The imperial Valley-Miguel 500kV line and Imperial Valley Rosita 230kV line trips for Case D. The SCE grid remains stable. The minimum post trip transient voltage at the SONGS switchyard is 217.6kV, and the steady state voltage recovers to 218kV in about 3 seconds. The steady state voltage at the SONGS switchyard is 224.8kV. Caso E The Wra Loma 500kV North bus and No. 2AA transformer trip for Case E. The SCE grid remains stable. The minimu.Tl post trip transient voltage at the l SONGS switchyard is 215.7kV and recovers to 218kV in about 2 seconds. The 1 steady state voltage at the SONGS switchyard is 229.1kV. I Caso F - The Palo VerdcOevers 500kV line trips for Case F. The SCE grid remains stable. The minimum post tnp transient voltage at the SONGS switchyard is 221kV, and the steady state voltage is 227.2kV. ( Since the SONGS voltage was greater than 218kV for Cases A-F of Scenario 3, i no operating solutions are necessary. Scenario 4 Under Scenario 4, one SONGS unit is off line in either Mode 3 (80 MW,45 MVAR) or Mode 5 (25 MW,15 MVAR), and the remaining SONGS unit in Mode 1 (80 MW, 45 MVAR) trips following loss of a critical 230/300kV line(s)/ bus as shown below: Note: Numbers shown below in parenthesis represent the case where the SONGS oW4ine unitis M Mode 5. Numbers not shown M parenthesis represent the case where the SONGS oW4ine unit is in Mode 3. The same eines tdp M Scenano 4 as shown h Scenario 3 and are followed by tw Inpping of the remaining SONGS unit. Case A The SCE grid remains stable. The minimum post trip transient voltage is 201 (202.3) kV at the SONGS switchyard, and the steady state voltage is 211.6 (212.9) kV The SCE system threshold load is 13,600 (14,600) MW in order for the SONGS switchyard voltage to recover to 218kV under Case A. When the SCE Area 1. cad is above the threshold, shedding 960 (540) MW of load at Johanna and Santiago when the remaining SONGS unit trips will allow the SONGS switchyard voltage to recover to 219kV. ! r 1 i Case B
- t. The SCE grid remains stable. The minimum post-trip transient voltage is 187.5 )
(188.5) kV at the SONGS switchyard, and the steady state voltage is 205 (206) kV. The SCE system threshold load is 13,600 (14,100) MW in order for the SONGS switchyard voltage to recover to 218kV under Case B. t 7
. . . . . . .. .. }
l
When the SCE Area Load b above the threshold level, tripping of 1530 (1530) MW cf load tt Ellis, J:h nns and Santiago wh:n the r mrining SONGS unit trips would allow the SCE switchyard voltage to recover to 218.5 g . (218.6) kV. Case C The SCE grid remains stable. The minimum post trip transient voltage is 180 (182) kV at the SONGS switchyard, and the steady state voltage is 190 (192) kV. The SCE system threshold load is 11,600 (12,600) MW in order for the SONGS switchyard voltage to recover to 218kV under Case C. When the SCE Area Load is above the threshold level, tripping of 960 (960) MW of load at Johanna and Santiago when the remaining SONGS unit trips would allow the SONGS switchyard voltage to recover to 220 (222) kV. Case D ; The SCE grid is unstable for Case D under base case conditions (SCE load at
~
18,300 MW and Arizona-Califomia flows at 5000 MW). Sensitivity analysis indicates that if either tne Arizona California flow is reduced to 4500 MW or l SCE load is reduced to 17,000 MW, system stability is attained. In order to l attain 218kV voltage at SONGS, the SCE system load is 12,600 (13,600) MW ! or lower. ! I When the SCE Area Load is above the threshold level, opening the I SCE/SDG&E tie and tripping 200 MW of Santiago load would allow the SONGS ' switchyard voltage to recover to 218 (219) kV when the remaining SONGS unit j trips. If the SCE/SDG&E tie lines are not opened, tripping of about 3500 MW - of SCE/SDG&E load would be necessary when the remaining SONGS unit trips j to allow the SONGS switchyard to recover to 218 (219) kV. ; Y Case E The SCE grid is stable. The minimum post-trip transient voltage is 205 l (206) kV at the SONGS switchyard, and the steady state voltage is 216.6 (217.8) kV. The SCE system threshold load is 16,600 (17,400) MW in order for the SONGS switchyare voltage to recover to 218kV under Case E. When the SCE Area Load is above the threshold level, tripping of 540 ! (540) MW of load at Santiago when the remaining SONGS unit trips would 1 allow the SONGS switchyard voltage to recover to 220 (221) kV. e E grid remains stable. The minimum post-trip transient voltage is 197 (199) kV at the SONGS switchyard, and the steady state voltage is 206.4 (208.4) kV. The SCE system threshold load is 13,600 (14,600) MW in order for the SONGS switchyard voltage to recover to 218kV under Case F. When the SCE Area Load is above the threshold level, tripping of 1530 (1530) MW of load at Ellis, Johanna, and Santiago when the remaining SONGS unit trips would allow the SONGS switchyard voltage to recover to 218.4 (219.8) kV. For all contingency cases studied under Scenario 4: 1) The SONGS voltage is greater than 218kV prior to tripping the ren.aining SONGS unit, and 2) The SONGS voltage would be grsator than 218kV following loss of lines and the remaining SONGS unit if SONGS Unit 1 were on-line. (t 4 4
I IV. CONCLUSIONS l ( Under Scenario 1, the SONGS voltage is marginally below the required 218kV. An ECC operating procedure is now in place to insure that the SONGS switchyard voltage does not fall below 218kV when 4 the r6maining SONGS unit trips. This procedure restricts SDG&E by up to 200 MW of import power I under certain operating conditions.' j Under Scenario 2, the SONGS voltage does not recover to 218kV when both units trip simultaneously. NEDO is designing a relay scheme for SONGS which will compensate for the undervoltage condition found in Scenario 2. Under Scenario 3, the SONGS switchyard voltage recovers to 218kV and above. No corrective action is required. Under Scenario 4, the SONGS switchyard voltage does not recover to 218kV. Though studies show that 218kV voltage can be attained following disturbances by tripping various amounts of load, this attemative is not being considered due to the very low probability of such events happening. As a more desirable attemative, NEDO is presently developing a relay scheme for SONGS which will protect SONGS for the undervoltages found in the contingencies studied in Scenario 4, as well as Scenario 2 (WR 2060). In the meantime, an ECC operating procedure has been developed to monitor system coaditions which can lead to inadequate voltage at SONGS. Under the procedure, whenever a SONGS unit is off-line and a criticalline is lost while the SCE Area Load is above the threshold level, the ECC will notify SONGS of the inoperable status of the SONGS off-site power source (unable to support SONGS voltage at 218kV if the remaining unit trips). SONGS will then enter the appropriate technical specification action statement and take any required ac: ion. The Scenario 4 procedure will remain in effect until NEDO and System Operation decide it is no longer necessary to monitor system conditions because either' new facilities are added as long-term solutions or automatic tripping / relay schemes are implemented to protect [ against inadequate voltages at the SONGS switchyard. 1
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- --- -----7 gomos emag e$se yssenagap rees p espa p sdne seganapsap suee:
> eewa e si nopa s )Zs nAA-
- gg nAyg( 3 sawesussiS SONDS Y oeseeSe p go }n5nwgesamseo y gsm }mgewesno f004 Aitseo l@ spO MAA og goop s3 smuesac sneepA sesse AogiuGe
' nusa es nape i )00 nnA' smeeS sase AFee8e
- ZlZ 64A mi gga wA loop 1N*edaolp = 1t'900 MAA ts MAVU(' -
s' OaneBe *# #* 18B*-tetJe lauto Z d C SessA 1fsnes tud tSCO MAA og goop es 3% goaisuuo T sesnes60 sneepA sesse APee6e = g094A sesopA sesse ADIeuOe el Z19 94A" loop iMeelnoeP
- tt*t00 MAA' O' Oneu8* 88 98 3me*feeleseuo 9 3 tele-seuele5e ZCessA 1fs**e iulE 69G MAA ot leeP el sevee00 2' 'fogasuus sesopA
- sesopA gnose Aaf"A" = 56EA sesse Aossuom oI ZZEA' loop LN*ettalp = LZ'900 MAA 9
31 onesse on see 88M8e8lsI A _". - . S004A lrane y em seneessop Awggoegne lud CS00 MAA p toop tu s03/ soot 3,s sAsesu neoL ZC04A l8ua s03/ SOOT 3 es guos ot dge3e sesopA staes Aouu8e p gup a nuseRe' ZL6 EA* loop lqsegnaR = &C 3ou = tt00 nAA odnu s33/s'9OO nnA oova essaias eiped oulA Z00 MAA p s03 loop 1 Oaemse e sa esa* 1*ous ses ese** sae v ete 3vv esua 1# spO nAA p seuesao smee4 snee Aonaae p sesopA smees AFeu8e = ZBf 04A Z344A? leep igoediolp = ll'tcO MAA d* onemme es sa dege Ae8Pe Oemmas 6004A lime lu8E ISCO RAA P loop 88 W W satee80 ggeepA sesse Apem8e
- Z09 r4A sese5 snem Aosnee w tgS 04A* loop iqesenom =
nr 900 trAA
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l Table 2 l Southern California Edison and Metropolitan Water District Are,a 1991 Heavy Summer 3 Loading - 1991 HS3 AREA INTERCHANGE SHEET MW RESOURCE METERED AT .igl1I.
-lN (4 Corners) Eldorado -688.1 (UP&L) Eldorado 0.0 (Navaho) Eldorado 0.0 (Palo Verde 1,2,3) PV -602.0 (MSR) PV -38.5 (PV-D fr LADWP) PV -217.2 (PV-D fr DWP/SCPPA) PV -150.8 .
(SRP Excess) PV -100.0 i (APS) PV 500.0 - (TEP) Eldorado -300.0 . () ' : PV 0.0 I NET with ARIZONA -2596.0 (SCE Geothermal) Mirage -470.0 NET with IMPERIALCA -470.0 (Pacific AC for LADWP) Sylmar 294.4 (PV for LADWP Firm) Sylmar 359.2 (Mohave) Eldorado 316.0 (CDWR - Reid Gardner) Eldorado 0.0 (CPP DC Line) Sylmar -1813.5 (DC Line Pasadena) Sylmar -62.5 (Hoover Pasadena) Sylmar -19.0 (CDWR Castaic - State) Sylmar -71.0 (SCPPA Pasadena) Sylmar -9.4 (IPP - Pasadena) Sylmar -96.0 (IPP - Ana/Riv) .Victorville -333.5 (SCPPA Riverside) Victorville -11.6 (SCPPA - Munies) Victorville -16.9 g- (Deseret - Ana/Riv) Victorville -127.0
, (LADWP-SCE)Vemon Sylmar -15.0 (Resale Cities) Victorville 0.0 NET with LADWP -1605.8 12-
Sguth:rn Cciffornb Edicon cnd M.;tropolitan Wct:r Dictrict Arca 1 1991 Heavy Summer 3 Loading - 1991 HS3 l
/ l
( AREA INTERCHANGE SHEET (Cont'd.) l MW RESOURCE METERED AT 39E
-lN (NPC Laughlin Load) Mohave 65.0 NET with NPC 65.0 (Northwest DC) Midway 689.5 (Northwest AC) Midway -1081.0 >
(Hyatt) Midway -490.4 (Thermalito) Midway -84.6 , (MSR) Midway 38.5 (CDWR) Midway 71.0 (Economy Purchase) Midway -1143.0 ; NET with PG&E -2000.0-
~/ (San Onofre 1,2,&3) San Onofre 410.0 I
(Northwest AC) San Onofre 149.1
, (Northwest DC) San Onofre 96.5 '
(CFE) Firm . San Onofre -68.0 (Economy) San Onofre 0.0 (OF) San Onofre 0.0 NET with SDG&E 587.6 (Hoover SCE/ MWD) Mead -525.0 l (Hoover-Munies) Mead -80.7 j (Parker / Davis Grge/Nrtn.) Blythe -4.5
' (Parker / Davis - FAFB) Blythe -18.3 (Parker / Davis - MWD) Gene -50.0 (Mohave - SRP) Mead 158.0
. (Mohave - NPC) Mead 155.0 (Economy Fm SRP) Mead 0.0 (Appa - Anza Sale) Mead -4.3 (For MSR fm SRP) Mead 0.0
. NET with WAPA LC -369.8 g t Total Area interchange -6389 0 Firm import 3750.0 l 1
g San Diego Gas & Electric 1991 Heavy Summer - 1991 HS3 AREA INTERCHANGE
SUMMARY
MW A.JEA RESOURCE METER PT, NOUT.-IN) SOCALIF (SAN ONOFRE #1,2,3) SAN ONOFRE -410.0 SOCALIF (NORTHWEST) SAN ONFORE -245.6 SOCALIF (MEX1CO-CFE) SAN ONOFRE 68.0 NET with SOCALIF 587.6 , ARIZONA (APS) NORTH GILA -230.0 l ARIZONA (SRP ECONOMY) NORTH GILA -150.0 ( ARIZONA (PNM) NORTH GILA -99.0 t ARIZONA NORTH GILA 215.0 (TEP) ARIZONA (PALO VERDE-IID) . NORTH GILA 14.5 ARIZONA (EPE-IID) NORTH GILA -99.0 NET with ARl2ONA 807.5 11D (PALO VERDE IID) IMPERIAL VLY. 14.5 llD (EPE-IID) IMPERIAL VLY. 98.0 NET with IID 112.5 MEXICO-CFE (CFE) MIGUEL, IMPERIAL VLY. -220.0 NET with CFE 270.0 TOTAL AREAINTERCHANGE -1502.6 I
Table 3 . l
* '~
, Heavy Summer
. MW:MVAR Ratlos*
1993 Operating Studies 230nV Bus MW:MVA9 230 kV Bus MW:MVAR 3 Alamitos 6:1 Moorpark 12:1 Antelope 20:1 Olinda 20:1 Bailey 20:1 Padua 20:1 Barre 20:1 Rector 20:1 Center 20:1 Rio Hondo 20:1 Chino 20:1 San Bernardino 20:1 Del Amo 20:1 Santa Clara 10:1 Devers 20:1 Santiago 13:1 , Eagle Mountain 20:1 Saugus 20:1 Eagle Rock 20:1 Springville 20:1 Ellis 20:1 Valley (500kV) 20:' ( El Nido 14:1 Vestal 20:1 Etiwanda 20:1 Victor (115 kV) 10:1 _ Goleta 13:1 Villa Park 20:1 Gould 9:1 Vista . 20:1 Hinson 20:1 Walnut 20:1 Johanna 20:1 ,
- N ..
%~
Kramer (115 kV) 10:1 ,
.. g p m ~
La Cienega 9:1 "P c. -
- sx d , '^t 1! N La Fresa 15:1
,e ,
c.c < Laguna Bell 20:1 _ u - f. m 'm.a,-w-s Lewis 6:1 r % E . % ~ ^ g ; f' h, % Lighthipe 20:1 j ah ~
- ;'.e~
Mesa 10:1 < _. $/^'.* y; , y n
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( f:: Based.on.a.v.knetion
,, . ,.,,,,,, of,act.ual
- e. chtWAtVAR
, an ,,re, dos ,. at.1500
.,. c.,, NFES an eAppunt,il 1992.
h service to the essent Wat the subeintlot, htWAtVAR tana k not greater ^ L ' shan 20:1 at any location t\ar conservathe purposen, .
i k I i AttachmentT . GUIDELINES for t SONGS Grid Stability Studies i i 1
; I I
i 1 i i
,,.... 4
ATTACHMENT 1 Guidelines for SONGS Grid Stability Studies SCENARIO 1 . t ( Initial Conditions and Sequence of Events , Unit 2: Omine, mode 3. Unit 3: ' Mode 1,100% power; design basis accident occurs followed by a unit trip. Evaluatba'
!) Does the grid remain stable?
- 2) What is the minimum post trip transiest voltage at the SONGS switchyard?
- 3) What is the post trip steady state voltage at the SONGS switchyard?
- 4) If the transient voltage dips below 218 kV at the SONGS switchyard: -
a) does it recover to k 218 kV? - ' b) how long does it take? . c) what is the maximum allowable offsite system load (threshold), prior.to the SONGS 3 trip, that will ensure that the SONGS switchyard voltage will recover to k 218 kV7
/
.I 5) If Unit I were online at 100% power in this scenario, would the SONGS switchyard voltage remain stable at k 218 kV7 If not, what offsite system load threshold would be required to achieve this? ( i . Note 1: Voltage end frequency pofiles should be powded for each scenario. 1
ATTACHMENT 1 Guidelines for SONGS Grid Stabuity Studies SCENARIO 2 i ( Initial Conditions and Sequence of Events Units 2 and 3 both operating at 100% power. A system fault occurs (external to SONGS). which results in a simultaneous trip of both SONGS units. ; Evaluation
- 1) Does the grid remain stable?
- 2) What is the minimum post trip transient voltage at the SONGS switchyard?
- 3) What is the post trip steady state voltage at the SONGS switchyard?
- 4) If the transient voltage dips below 218 kV at the SONGS swithyard:
a) does it recover to k 218 kV7 b) how long does it take? c) what is the maximum af towable offsite system load (threshold), prior to the unit trips, that will ensure that the SONGS switchyard ' voltage will recover to 2 218 kV7
- 5) If Unit I were online at 100% power in this scenario, would the SONGS If switchyard voltage remain stable at k 218 kV7 If not, what offsite system load threshold would be required to1chieve this?
e e t d 2
ATTACHMENT 1 Guidelines for SONGS Grid Stability Studies l SCENARIO 3
! Initial Conditions and Sequence of Events ,
Unit 2: Offline, mode 3. Unit 3: Mode 1,100% pvwer. System: Loss of largest generation source due to a single event. This may be the loss of the largest station or transmission line on the grM, or possibly several large stations or transmission lines if they share a common tower. A subsequent loss of generation that could occur due to interlocks or cascading effects should be considered. Events t on both the SCE system and SDG&E system should be considered. Evaluation
- 1) Does the grid remain stable?
- 2) What is the mmimum transient voltage at the SONGS switchyard?
- 3) What is the final steady state voltage at the SONGS switchyard?
e I t l s 1 I 3
. . . .... . . . . . . . . l
ATTACHMENT 1 GuideHa*= for SONGS Grid Stability Studies , SCENARIO 4
/
;- Initial Conditions and Sequence of Events Unit 2: Offline, mode 3.
System: ' Loss of largest generation source due to a single event followed by (not concurrent with) a Unit 3 trip (this scenario is a con:inuation of Scenario 3 above). Events on both the SCE system and SDG&E system should be considered. Unit 3: Mode 1,100% power; a design basis accident occurs followed by a unit trip. Evaluation
- 1) Does the grid remain stable?
- 2) What is the minimum post trip transient voltage at the SONGS switchyard?
- 3) What is the post trip steady state voltage at the SONGS switchyard? ,
- 4) If the transient voltage dips below 218 kV at the SONGS switchyard:
I a) does it recover to k 218 kV? i b) how long does it take? c) what is the maximum allowable offsite system load (threshold), I prior to the SONGS 3 trip, that will ensure that the SONGS l switchyard voltage will recover to k 218 kV7
- 5) Following the generation loss on the grid, but prior to the SONGS 3 trip:
i a) can the offsite system " Operability" be restored (i.e. can loads and i generation sources be adjusted such that the grid will remain stable l at k 218 kV when SONGS 3 trips)? b) how is restoration of the offsite source Operability accomplished, and how long does it take?
- 6) If offsite system Operability cannot be restored per [5] above, what other methods, such as system load shedding, can be used to ensure SONGS switchyard voltage remains stable at k 218 kV7
- 7) If Unit I were online at 100% power in this scenario, would the SONGS switchyard voltage remain stable at k 218 kV7 If not, what actions could be taken or what offsite system load threshold would be required to I achieve this?
4
l 1 4 A i enttachment2 . (
; Stability Plots i
! Scenarios 1 - 4 1 1 1 4 i i
I l i l l l Stability Plots l 1 l Scenario 1 I l One SONGS unit out of service and in Mode 3 (80 MW,45 MVAR), and
, the remaining SONGS unit on-line in Mode 1 (80 MW,45 MVAR} trips.
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4 Stability Plots Scenario 3 - Case A: . Outage of Mira Loma-Serrano l and Lugo-Serrano 500kV lines l l (double circuit tower). A2-15
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i November 2,1993 i B. CARLISLE t SUB1ECT: ECC Operneing Procedure: Mira Laam 500kV - ggr6 Bus Ontare (S* -h 4E) i This letter is in response to your recent inquiry con'ceming the absence of the Mira Loma . 500kV North Bus outage in the ECC operating pmcedtut. 1 . A SONGS Grid Stability and Voltage Study was issued on August 9,1993 which covered the study results of several SONGS scenarios (Scenarios 1-4) which could lead to inadequate j voltage at SONGS. Using these study results, an ECC operadng procedure was issued on June
' 15,1993 and was designed to monitor system conditions which could lead to inadequate voltage '- at SONGS. 'Ihe ECC procedure did not include the Mira Imma 500kV Nonh Bus outage. This ,
outage would result in 216.6kV bus voltage at SONGS only if the SCE area load exceeds 16,600 MW. It was felt that the probability of reaching this high SCE area threshold (probability i g of load e=ca>*ag 16,600 MW = .005) was very low. (The 1993 annual peak load was
- 16,475 MW.) Fwbuse, historical data showed no records of forced outages of 500kV buses ;
other than those due to severe earthquakes. i Since that study, both System Operation and Planning have agreed to alopt a 25/1 { )
)
watt / var ratio for all SCE substations modeled in load flows. A sensitivity study with a 25/1 watt / var ratio wu made of the Mira 14ma 500kV North Bus outage, and the SONGS voltage l I improved to 218.1kV. 'Ibc earlier study used a 20/1 watt / var ratio for most substat!ons, with some substations as low as 6/1. Due to the latest studies, there is no need to include the Mira '
- Loma 500kV bus outage in the ECC procedure. .
If you have any further questions mains this maner, please call'me at PAX 2-16*il. y ..
..- % S. k W. D. CONNER cc: R. F. Baneno *
,,- M. D. . Lopez ^ ,
D. Stickney
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