ML20216B135
| ML20216B135 | |
| Person / Time | |
|---|---|
| Site: | Clinton  |
| Issue date: | 04/21/1998 |
| From: | ILLINOIS POWER CO. |
| To: | |
| Shared Package | |
| ML20216B123 | List: |
| References | |
| NUDOCS 9805150051 | |
| Download: ML20216B135 (89) | |
Text
{{#Wiki_filter:ILLINOIS POWER COMPANY CLINTON POWER STATION SVC DESIGN REPORT Revision 0, Dated 4/21/98 9805150051 980504 - PDR ADOCK 05000461 P PDR
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 TABLE OF CONTENTS 1 INTRODUCTION.....................................................................................................................I 1.1 PURPOSE............................................................................................................................I 1.2 DESIGN PRIOR TO INSTALL ATION OF SVC .......... .................. .. ... . ......... . . ...... ............ .. .. .. ... . .. 1.2.I Non-Class 1Ebuses.....................................................................................,..........I 1.2.2 Class 1EBuses...................................................................................................2 1.2.3 RAT Trans former & Connecting B us Duct ....... ........ ............................................ 2 1.2.4 ERAT Transformer & Connecting Cable and Bus Duct............ ............................. 3 1.3 DEFINITIONS...........................................................................................................................3 1.3.1 Minimum Operable Offsite Voltage (V343xyuruop,V,3,xysixop)--.-~~.--~~~.-~~.3 ; 1.3.2 Minimum Expected Offsite Voltage (V ,3xy 3 uiu ex,,V i3 xv uiu exe)-. ~~~ ~~~~~-- ~3 j 1.3.3 NIaximum Operable Offsite Voltage (V3my uxx op, V ,xyi3u,x op) -~ ~~.-~ ~ ~ ~ ~ ~ ~~~ 3 j 1.3.4 Maximum Expected Offsite Voltage (V343gy uxx exp,i3V ,xy uxx sxp) -~~~_--- _-- 3 l.3.5 Degraded Grid Relay Dropout Analytical Limit Voog ooxyt.-~~~~~~ .----~~-- A 1.3.6 Degraded Grid Relay Pickup Voltage Vocapu-- --~~~~~ --~~~~~~~~~~ ~~~~ - 4 1.4CPSVOLTAGES....................................................................................................................4 . 1.4.1 V o lt ag e Re q ui rem e nt s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4.2 RAT and E RAT P roj ected Voltages....... ... . ....... .................. . ..... . . .. ..... .................... 4 1.5 DESIGN AFTER INSTALLATION OF THE STATIC VAR COMPENSATORS................... ...................... 5 2 S V C S YSTE M D ES C RI PTI ON . . . . . . . . . . . . . .. . . .. .. . . . . ... .. . . . . . . . . . . . . . .. . . .. . . . . . .. .. . . . . . . . . . . . 2.1OVERV1EW............................................................................................................................6 2.2 OUTPUT BREAKERS AND MAIN DISCONNECT SWITCH..... ................... ....... ....... ....... ............... 7 2.3 THYRISTOR CONTROLLED REACTOR (TCR) B ANK .. .... ....................... ................. ....... ........ 7 2.4 THYRISTOR SWITCHED CAPAClTOR (TSC) B ANK...... ..... . ................................................. . ..... 8 2.5 H ARMONIC FI LTER C APACITOR B ANK...... . .. . . . . .. . .... . .. . .. . .. .. .. .. . . . ... .. . . .. ... .. . . . ...... ... .. . .. ... . ... 2.6 PROGRAMM ABLE HIGH SPEED CONTROLLER (PHSC) . ...... ..... . ... ..... ........ ... .............. ...... 10 2.6.1 P H S C O v e rv i e w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.6.2 PHSC Control with EDG Paralleled to Offsite Source............................ ................ I 1 2.6.3 PH SC Control with RAT Paralleled to UAT.......... ......... .... .. .......... ........ . ......... I 2 2.6.4 PHSC Control With RAT Paralleled to ERAT................... ... . ............. ........ .....12 l 2.6.5 PHSC Protection........ .................................................................................I2 j 2.7 VALVE CONTROL S YSTEM........ .. .......... . . ........ .... ..............................................13 2.7.1 O ve rvi e w . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... .... .............. . . . . . . . . . . . . . . . ..........13 2.7.2 TC R Thyri stor E lec tro ni c s . . . .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.7.3 TCR Valve Base Electronics..... .... .. ... .. . . . . . . . . . .... ....... ....... ....... ...... 15 DE&S Project 00153.00.0009.07.00000. Page i
i Illinois Power Company SVC Design Repert Clinton Power Station Revision 0 l l l TABLE OF CONTENTS 2.7.4 T S C Thy ri sto r El ec tro ni c s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7.5 TS C Valve B ase Electronics . ... . . . .. . . . . .. .. .. .. . . . . . . . . . . . . . . .. .. . . . . . . . . . . . . . . . . . . . . .. . . 2.7.6 L i gh t S i g nal Transm i s si on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7.7 Thy ri st o r M o nit o ri n g . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .
- 2. 8 S V C M I M I C B O A RD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .............................I7 2.9 SVC PROTECTION SUB-SYSTEMS (SVCPS) ..................... .... .................. ........................... ...... 18 2.9.1 Overcurrent, Negative Sequence Undervoltage, & overvoltage Protection... ..........19 j 2.9.2 Voltage Phase Unbalance Protection (46) .. ........ ................................................... 21 l 2.9.3 Harm o nic P ro te c t io n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
l l t 2.9.4 5th g 7th/HP Harmonic Filter Branch Protection ................. .............................. . 22 I 2.10 S VC DC POWER DISTRIBUTION SYSTEM . .......... ...... ...... . ..........$...... ..... .. . .. ........ ......... .......... . 23 2.1 1 SVC AC POWER DISTRIBUTION SYSTEM ........ .. ...... . .... ... .......... . ... . ... . . ........ ... ............... ... ... . 2.12SVC CONTROL BUILDING F1RE PROTECTION SYSTEM ........... ..... .......................................24 2.12.1 Main Fire Alarm Control Panel (FACP).. ............................................................24
- 2. I 2.2 Incipient Fire Detection system (IFD) ..... .................... ..... ............... ................... 25 2.12.3 Water Mist Suppression System . . .. ..... .............................. .. .... ... ............. ......... ... 25 2.12.4 FM-200 Gaseous Suppression System . .... . ... ... . .... .. ........ . .... .. ............ ...................... 25 1
{ 2.13 SVC THYRISTOR VALVE COOLING S YSTEM...... ................. ... .................................................. 25 \ 3 ELECTRICAL SYSTEM ANALYSI S ... . ...... ........ .. ... . ... ..... . . .......... ...... ... . .... . ..... .................... . 2 7 3 3 .1 H A RM ON I C A N A LY S I S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 STEADY STATE LOAD FLOW ANALYSIS.................. ................................... ........................27 t s
- 3. 3 TRAN SI ENT LO A D FLO W AN A LYS I S . . . .. . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . . .. . . . .. ... . . . .l 3 .4 PROTECTIV E REL A Y AN ALY SIS ... . . . . . . . .. . . .. . . . . . . . . . . . ....... .. . . . .. .. . . .. . . . . .. ... . . . .. . .. .
3 . 5 S HO RT C l R CUIT AN A LY SI S . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . .. . .. .. . . . . . . .. . . . . . . . . . . . . 4 FAILURE ANALYSIS.......... ............. .... ........ ......................................................................29 4.1 OBJECTIVE.... ..... ....... . . ........................................................................................29 i 4.2 F A I LU RE AN A LYSI S . . . . . ... . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...............................................29 5 REFERENCES...............................................................................................................30 5.1 LtCENSING DOCUMENTS . . ........... . . ...... ...... .........................................................30 5.1.1 Clinton Power Station Technical Specifications .. .. .. ...... .. ......... ... ... ............... 30
..................................................30 5 .2 D RA WI N G S . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2.1 Clinton Power Station Drawings....... .. .
..............................................30 5.2.2 A B B Drawin g s . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . .......................................................30 5.3 REPORTS AND CALCULATIONS ....... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...................31 DE&S Project 00153.00.0009.07.00000. Pageii
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 TABLE OF CONTENTS 5.3.1 Illinois Power Company Reports ..... ... .. ...... ..... . ..... . .. .. .............. ... .... ... .............. 31 5.3.2 ABBReports.....................................................................................................31 l 5 . 4 I N D U STR Y S TA N D A RD S . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .l 5.4.1 A N S I S t an d a rd s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4.2 I E E E S t a n d a rd s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 TECHNICAL TEXTS AND VENDOR INSTRUCTION M ANUALS ..... ......... ....... ............................... 31 5.5.1 Te c h n i c al Te x t s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 5.5.2 Vend or I nstruction Manual s . . . . . . . . . . . ... . .. . . . . . . . . . . . . .. . . .. . . . . . . . .. .. . . . . . . . . . . .. . . . .j
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( lilinois P:wer Company SVC Design Report Clinton Power Station Revision 0 l i I i LIST OF TABLES l TABLE 1: RAT & ERAT TRANSFORMER RATINGS .. .. . . . . .32 i TABLE 2: 4 KV AND 6.9 KV BUS INFORMATION...... .
. . . .. . . 33 l TABLE 3: PHSC TSC PROTECTION .. . . . 34 TABLE 4: PHSC TCR PROTECTION.. i
. .. . .35 j TA'LE 5: TSC FAILURE ANALYSIS.. . . . . . . . . . . .. . . . . 36 l TABLE 6: TCR FAILURE ANALYSIS.. . . . . . .37 TABLE 7: FILTER CAPACITOR FAILURE ANALYSIS . ...... .. . . ... . . - . . .38 l 1
TABLE 8: PHSC FAILURES ANALYSIS . .. . . . .39 I l TABLE 9: POWER SUPPLY FAILURE ANALYSIS = !
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.. . . .. . . 40 TABLE 10: CPS VOLTAGES, RAT SOURCE, NO MODIFICATIONS,2007.. .41 TABLEI1: CPS VOLTAGES, ERAT SOURCE, NO MODIFICATIONS,2001. . 41 l
l TABLE 12: CPS VOLTAGES, RAT SOURCE WITH SVC,2007.. . . i t .. .c. . .. .. 42 ! l TABLE 13: CPS VOLTAGES, ERAT SOURCE, SVC 2001.. ... . . . .. . . 42 I TABLE 14: SVC DESIGN REQUIREMENTS = . . . . . . . .
-. 43 TABLE 15: TCR REACTOR RATING : . . . .. . .. 44 TABLE 16: MAIN DISCONNECT SWITCil RATINGS . . . . . . . . . .
. 45 TABLE 17: TCR DISCONNECT SWITCil : . . . ... . ... 45 TABLE 18: TSC DISCONNECT SWITCil.. . . .... .. . . .. .
.45 TABLE 19: TSC CAPACITORS. . . .. .. . . . . . . . 46 TABLE 20: TSC INDUCTOR-- . . . .. . . 47 TABLE 21: FC DISCONNECT SWITC11.. . . .. .. . . . . .. . . . . . . .48 TABLE 22: FC CAPACITOR. .. . ... .. = . . . . . .. 49 TABLE 23: FC INDUCTOR & RESISTOR.. . . . . . . . .. .. . .. . . .. .50 1
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Illinois PowIr Company SVC Design Report Clinton Power Station Revision 0 i LIST OF FIGURES l FIGURE 1: CPS ONE LINE WmlOUT SVC . . . . . . . . . . . . . . . . . . . . . . . . . 51 FIGURE 2: 4.16 KV BUS I A RESERVE FEEDER BREAKEn 52-221 A SIMPLIFIED TRANSFER LOGIC.. .
.52 FIGURE 3: 4.16 KV BUS l Al ERAT SUPPLY BREAKER 52-221 A1 SIMPLIFIED TRANSFER LOGIC.. . . .
.53 FIGURE 4: 4.16 KV BUS 1 A1 RAT SUPPLY BREAKER 52-201 A1 SIMPl!FIED TRANSFER LOGIC.. .. . . 54 FIGURE 5: 345 KV VOLTAGES NO MODIFICATIONS.. . . . . . . . . . . . . . . . ... . . . . . . . .. , . 5 5 l
FIGURE 6: 138 KV VOLTAGES, NO MODIFICATIONS.. . . . . . . . . . .
. . . . . . . . 56 j FIGURE 7: CPS ONE LINE Wm1 SVC MODIFICATIONS... . . . . . . . . . . . . . .. =;57 FIGURE 8:
{ RAT SVC ONE LINE DIAGRAM:- .. ...
.58 FIGURE 9: ERAT SVC ONE LINE DIAGRAM.. . l
. . 59 FIGURE 10: SITE ARRANGEMENT PLAN., ....... {
l
. 60 l FIGURE I1: ERAT SVC ELECTRICAL PLAN.. .
..61 FAGURE 12: ERAT SVC CONTROL BUILDING PLAN LAYOUT . . . . /- . . . . -62 l FIGURE 13: RAT SVC ELECTRICAL PLAN . ... .. . . .. - 63 FIGURE 14: RAT SVC CONTROL BUILDING PLAN LAYOUT : . . . .
.64 l FIGURE I5: THYRISTOR CONTROLLED REACTOR (TCR) THREE LINE DIAGRAM - .. . . . . . . . 65 l FIGURE 16: TCR HARMONICS DIAGRAM . . .. . . .. . .66 FIGURE 17: TlfYRISTOR SWITCHED CAPACITOV.(T5C) THREE LINE DIAGRAM : =67 FIGURE 18: HARMONIC FILTER CAPACITOR (FC) THREE LINE DIAGRAM..... .. . . ... .. . . . . . . . . . . . . . .68 FIGURE 19: ,SVC DC SYSTEM ONE LINE DIAGRAM. . ..
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. . 69 FIGURE 20: SVC CON'iROL SYSTEM . .. . . . . . . . . . . . . . . . ~ . . . . . . . . . . .. .. .70 FIGURE 21: RAT SVC PROTECTION SYSTEM ONE-LINE., . ... . .. . . . . . . . . . . . 7i FIGURE 22: ERAT SVC PROTECTION SYSTEM ONE-LINE ; ... .. .. . . . . . . . .. . 72 1
FIGURE 23: LOCAL FIRE ALARM PANEL LOGIC DIAGRAM ALARM RESPONSE.. . . ... . 73 i FIGURE 24: LOCAL FIRE ALARM PANEL LOGIC DIAGRAM - SUPERVISORY /FROUBLE RESPONSES.. .. ;;74 FIGURE 25: COOUNG ST ETEM FLOW DIAGRAM... . . . . . .. .. .. . . . . . . . . . . . . . . . . .. . . 75 l DE&S Project 00153.00.0009.07.00000. Page ii
lilin:is PowIr Company SVC Design Report Clinton Power Station Revision 0 4 i LIST OF ACRONYMS
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BOD Break Over Diode CPS Clinton Power Station DGR Degraded Grid Relay ERAT Emergency Reserve Auxiliary Transformer FC Filter Capacitor LTC Load Tap Changer l
)
l PCB Printed Circuit Board j PHSC Programmable High Speed Controller i ! PLC Programmable Logic Controller j RAT Reserve Auxiliary Transformer SVC l Static Var Compensator I SVCPS Static Var Compensator Protection System TCR Thyristor Controlled Reactor TE ' Thyristor Electronics 4 TM Thyristor Monitor TSC Thyristor Switched Capacitor VBE Valve Based Electronics EDG Emergency Diesel Generator CT Current Transformer l l l l l l l l DE&S Project 00153.00.0009.07.00000. Page iii
lilin:is Power Company SVC Design Report Clinton Power Station Revision 0 ! 1 INTRODUCTION 1.1 PURPOSE The purpose of this document is to: l- Describe the design of the offsite power from the reserve auxiliary transformer (RAT) and the emergency reserve auxiliary transformer (ERAT) prior to addition of a Static Var Compensator (SVC) on the output of each transformer.
- Identify undervoltage and overvoltage conditions that can occur at the Class 1E buses through 2007 without an SVC.
l e Describe the SVC and how it will maintain voltage at the Class 1E buses within an l acceptable range. ( e Analyze the impact of SVC failures on Class 1E buses. 1.2 DESIGN PRIOR TO INSTALLATION OF SVC
- Figure 1 is a simplified one line representation of the existing power supply from the 345 kV l and 138 kV transmission systems to the 6.9 kV and 4.16 kV AC electrical distribution l systems at Clinton Power Station (CPS). Descriptions of the major components are provided
- below.
l l 1.2.1 Non-Class 1E buses The non-Class IE medium voltage buses are: e 6.9 kV bus l A e 6.9 kV bus 1B e 4.16 kV bus I A e 4.16 kV bus IB L The unit auxiliary transformers (UAT) are the normal source of power for the non-Class IE buses when the main generator is synchronized to the grid. ' The RAT provides power to the non-Class IE buses when the main generator is not j synchronized to the grid. The non-Class 1E buses have an aut0matic transfer from their respective UAT to the RAT. The opening of the supply breaker from a UAT to a non-Class 1E 4.16 kV or 6.9 kV bus will initiate a fast bus transfer of the non-Class 1E bus from the UAT to the RAT. The automatic transfer will occur as long as a protective device has not tripped the UAT breaker, and a bus fault does not exist. Figure 2 is a simplified logic diagram for the automatic transfer from the UAT to the RAT for non-Class 1E 4.16 kV bus 1 A. The transfer scheme for non-Class 1E bus 1B is similar. l \ DEAS Project 00153.00.0009.07.00000 Page1 , I i
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 The non-Class 1E buses also have a manual transfer scheme between the UAT and the RAT. Dwing a manual transfer the operator verifies the incoming source is in phase with the bus and the incoming source has acceptable voltage. if conditions are acceptable, the incoming breaker is manually closed by the operator, resulting in both bus supply breakers being closed at the same time. Both breakers will remain closed, connecting the UAT to the RAT, until the operator releases the open-close switch for the breaker connected to the incoming source. When the switch is released, the breaker connected to the running source will be tripped automatically. Figure 2 is a simplified logic diagram for automatic transfer from the UAT to the RAT and for manual transfer from the UAT to the RAT for non-Class 1E 4.16 kV bus l A. The transfer scheme for non-Class 1E bus IB is similar. 1.2.2 Class 1EBuses The Class IE medium voltage buses are:
. 4.16 kV bus l Al s
e 4.16 kV bus 1B1
. 4.16 kV bus ICI These buses have two offsite sources and one emergency onsite source per bus. The primary offsite source of power is the RAT. The secondary source of offsite power is the ERAT. Both offsite sources are required to be operable for plant operation (Reference 5.1.1). The emergency power source for each bus is an emergency diesel l generator.
Automatic transfer between the RAT and ERAT can occur as a fast bus transfer or a (loss of voltage) slow bus transfer. The automatic transfer can occur in either direction; from the RAT to the ERAT, or from the ERAT to the RAT. Figure 3 is a simplified logic diagram for transfer from the RAT to the ERAT. Figure 4 is a simplified logic diagram for transfer from the ERAT to the RAT. The Class 1E buses also have a manual transfer between the RAT and the ERAT. During a manual transfer the operator verifies the incoming source is in phase with
- the bus and has acceptable voltage. If conditions are acceptable, the incoming breaker is manually closed by the operator, resulting in both bus supply breakers being closed l
at the same time. Both breakers will remain closed, connecting the RAT to the " ERAT, until the operator releases the open-close switch for the breaker connected to the incoming source. When the switch is released, the breaker connected to the running source will be tripped automatically. Figure 4 is a simplified logic diagram for the manual transfer from the RAT to the ERAT for Class 1E 4.16 bus 1 A1. 1.2.3 RA T Transformer & Connecting Bus Duct The RAT is the startup and shutdown source of power for non-Class 1E 4.16 and 6.9 kV buses. It is also the primary source of power for the safety related 4.16 kV buses. The ratings for the RAT are listed in Table 1. Non segregated phase bus ducts connect the RAT to the 4.16 and 6.9 kV buses. i l-DE&S Project 00153.00.0009.07.00000 Page 2 u
( Illinois Power Company SVC Desiga Report
- Clinton Power Station Revision 0 1.2.4 ERA T Transformer & Connecting Cable and Bus Duct The ERAT is the secondary source of power for the Class 1E buses. The buses are the only loads that can be connected to ERAT. The ratings for the ERAT are also listed in Table 1. Connection from the ERAT to Class 1E buses is comprised of cable encased in an underground duct bank from the transformer to the control building.
Inside the control building, the connection is with non-segregated phase bus duct to the Class 1E buses. l 1.3 DEFINITIONS 1.3.1 Minimum Operable Offsite Voltage (Vu,xywuo,. V,,aywuo,) The minimum operable offsite voltage (V345xvwasop.V i3 xvursop)is the switchyard voltage that: e Will start and operate AC safety related equipment, e Will reset the degraded grid relay (DGR) and e
- Is Based on LOCA and unit trip loading.
1 1.3.2 Minimum Expected Offsite Voltage (Vugywuw, V,,aywuw) The minimum expected offsite voltage is the expected switchyard voltage for the following conditions:
- CPS offline
- LOCA and unit trip loads at CPS
- Major unit offline or major line outage 1
- Minimum of summer / winter system voltages 1.3.3 Maximum Operable Offsite Voltage (V u arugo, V,,,xvu,xop)
The maximum operable offsite voltage is the highest switchyard voltage that will allow safe operation of Class 1E equipment connected to Class 1E 4.16 kV buses,480 V switchgear,480 V MCC and associated 120 V control circuits, and 120 AC circuits feed from 480/120 V distribution transformers. This voltage is based on minimum plant loading. 1.3. 4 Maximum Expected Offsite Voltageu(V ayuaw. V,,ayuaw) The maximum expected offsite voltage is the maximum design rating of the switchyard equipment, based on ANSI C84.1 1995 (Reference 5.4.1). Based on the ratings identified in this standard, the following limits are set for the 345 and 138 kV switchyard.
- Vuso mx ex,=105% = 363 kV e V i3,umx,x,=105% = 145 kV DE&S Project 00153.00.0009.07.00000 Page 3
lilinois Pow:r Company SVC Design Repon Clinton Power Station Revision 0 1.3.5 Degraded Grid Relay Dropout Analytical Limit Vxa wat The DGR dropout analytical limit is the minimum voltage at the safety related buses that will operate AC safety related equipment connected to Class IE 4.16 kV buses, 480 V switchgear,480 V MCC and associated 120 V control circuits, and 120 VAC circuits feed from 480/120 V distribution transformers. 1.3. 6 DegradedGridRelayPickup Voltage Vwaeu The degraded grid relay pickup voltage is the voltage at 4.16 kV Class IE buses required to pickup or reset the degraded grid relay. 1.4 CPS VOLTAGES l 1. 4.1 Voltage Requirements 1.4.1.1 The minimum expected switchyard voltage shall be greater than the minimum operable switchyard voltage. 3454 V ACN EXP 345kV AGN Oe Vi3 ,,y,,y , 2 V ,,y3,yog i3 1.4.1.2 The maximum expected switchyard voltage shall be less than maximum l operable switchyard voltage L V,,,,yug g s V3 ,,,yugo, l V: i3 4ruum sV: i3 4ruuoe 1 l 1.4.1.3 With the switchyard voltage at the minimum expected voltage, the Class IE 4.16 kV bus voltage shall be greater than the reset voltagefor the DGR. 1.4.2 RATand ERATProjected Voltages l Figure 5 and Figure 6 depict the expected voltages in the 345 kV and 138 kV switchyards from the years 1998 through 2007. Table 10 and Table 11 provide data on voltages for 2007 (Reference 5.3.1). These figures and tables demonstrate that j without plant modifications, the minimum expected 345 kV and 138 kV switchyard voltages (V 3 ,3,y,o, V i3 ,3,y,,,x,) will be less than the minimum operable switchyard j voltage (V ,5xvumo,.V 3 :i3 5xvumo,). This condition would lead to the degraded grid relay dropping out and transferring Class IE loads to the EDG following a unit trip LOCA event with minimum expected voltage in the switchyard. This event would be in i violation of the requirements in GDC 17. i The figures also indicate that the maximum expected voltage (V 3 3,ymx,x,,V i3 :5xv mx ex,) is greater than the maximum operable voltage (V345xv mx o,. V :i3 5xvuixo,). Therefore, in 1998 and beyond, Clinton Power Station could experience both undervoltage and overvoltage conditions that would place plant outside its design and licensing bases. DE&S Project 00153.00.0009.07.00000 Page 4
1 lilin:is Power Company SVC Design Repon l Clinton Power Station Revision 0 1.5 DESIGN AFTER INSTALLATION OF THE STATIC VAR COMPENSATORS IP has performed an extensive review of different solutions for the resolution of the overvoltage and undervoltage conditions at the Clinton Power Station (Reference 5.3.1). The following items were considered in selecting a solution:
. Steady state voltage at the Class 1E buses 1
. Voltages during LOCA block start
. Margin for resetting the degraded grid relay
. Impact of failures on the safety related equipment The following modifications were selected to be implemented in 1998 as the first step in resolving the degraded voltage conditions: I e Installation of a +28.5 /-14.0 MVAR Static Var Compensator 'pn the output of the RAT (1998)
Installation of a +28.5 /-14.0 MVAR Static Var Compensator on the output of the ERAT (1998) e Replacement of the ERAT with an automatic LTC transformer (1998) , e I Replacement of 480/120 V distribution transformers with 480/120 regulating
- transformers Figure 7 is a one line showing the location of the RAT and ERAT SVC. Table 12 and Table 13 indicate that the SVC would maintain the Class 1E bus voltage at 100% i 1% for steady state conditions. It would maintain a starting voltage greater than 79% when the RAT is the l source and greater than 83% when the ERAT is the source. The SVC would provide the voltage control required to ensure that the Class IE system is operated within its design and licensing basis voltage range.
1 DE&S Project 00153.00.0009.07.00000 Page 5
lilin:is P:wer Company SVC Design Repon Clinton Power Station Revision 0 2 SVC SYSTEM DESCRIPTION 2.1 OVERVIEW The SVCs provide voltage control required to ensure that the Class IE system is operated within its design and licensing basis voltage range. To accomplish this, the SVCs are designed to maintain their respective 4.16 kV buses at preset voltage operating points. The SVCs perform their design function of maintaining 4.16 kV bus voltage by raising (adding capacitive reactance), or lowering (adding inductive reactance) the voltage, as required. The reactances utilized by the SVC are comprised of three major components; a Thyristor Controlled Reactor (TCR) bank, a Thyristor Switched Capacitor (TSC) bank, and a Harmonic Filter Capacitor (FC) bank. Normally when the SVC is connected to the 4.16 kV bus, the FC bank is also in the circuit since it is designed to perform a filtering function. The FC bank is composed of capacitors and inductors, but has a net capacitive reactance, and will therefore provide a net boost to the 4.16 kV bus voltage. If the boost provided by the FC bank raises the 4.16 kV bus voltage l beyond its preset voltage operating point, the voltage is lowered by inserting the required inductive reactance (a percentage of the TCR bank). The percentage of the TCR bank inserted into the system can be adjusted from 0% to 100%, based on the thyristor firing i angle. Under normal conditions, the SVC is designed to maintain the voltage at the preset operating voltage point by modulating the percentage of the TCR bank inserted in the system i to balance the net capacitive reactance of the FC bank. The TSC bank is normally not inserted in the system. As the voltage on the 4.16 kV system decreases, the TCR firing angle is reduced, reaching a zero firing angle (which corresponds to 0% reactance) in the limit. When the 4.16 kV system voltage dips below the capabilities of the FC and TCR banks to maintain the voltage, the i TSC is inserted into the system to provide the required voltage boost. The TSC design requires it to be inserted 100% or not at all. Therefore, once the TSC is inserted into the system, there will be a significant momentary voltage boost, which is immediately compensated by increasing the TCR firing angle to insert sufficient inductive reactance to satisfy the preset voltage operating point. The SVC will operate in this configuration when responding to undervoltage transients. Once the voltage has recovered, the TSC would be removed from the circuit, and the SVC would operate in its normal configuration. Further details on the SVCs are discussed below. Table 14 provides the design requirements for each SVC. The figures listed below provide an overview of he electrical design and physical layout for the ERAT and RAT SVC:
- Figure 8: SVC One Line Diagram (RAT) e Figure 9: SVC One Line Diagram (ERAT) e Figure 10: Site Arrangement Plan
. Figure 11: ERAT SVC Electrical Plan DE&S Project 00153.00.0009.07.00000 Page 6 4
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Illinois Power Company ! SVC Design Report Clinton Power Station Revision 0
+ Figure 12: ERAT SVC Control Building Layout Plan-
- Figure 13: RAT SVC Electrical Plan e Figure 14: RAT SVC Control Building Layout Plan Each SVC contains the following main components:
. Output breakers and main disconnect switch
. Thyristor controlled reactor (TCR)
. Thyristor switched capacitor (TSC) e 5* and 7*/High Pass harmonic filter e Programmable High Speed Controller (PHSC) e Protection system with redundant sub-systems e Redundant DC power distribution system
. AC power distribution system
. Control building fire protection system
. Thyristor cooling system
. SVC control building 2.2 OUTPUT BREAKERS AND MAIN DISCONNECT SWITCH The manual isolation device to disconnect the SVC from the ERAT or RAT transformer is a 4,000 an' pere disconnect switch which is mechanically interlocked with a grounding switch.
Each SVC is provided with two power circuit breakers (52-1 and 52-2) connected in ser es. Each circuit breaker is a 145 kV, SF( dead-tank breaker rated for 4,000 A continuous, and 63 kA interrupting. These breakers are the lowest voltage rating breakers that are capable of carrying 4,000 A continuously and able to interrupt 63 kA. Each breaker has two trip coils. One trip coil is connected to battery system A and the other trip coil is connected to battery system B. Each protection sub-system sends a trip signal to both power circuit breakers. The circuit breakers are also provided with a capacitive inp device that will trip the circuit breaker on loss of de power. 2.3 THYRISTOR CONTROLLED REACTOR (TCR) BANJ The TCR bank is a three-phase, delta connected system, rated 21.5 MVAR inductive at 4.16 kV. The major components of the TCR bank are a three phase disconnect switch (Table 17), l air cooled reactors (Table 15), and four levels of anti-parallel thyristor valves. A three line diagram of the TCR is shown in Figure 15. The thyristor valve for the TCR bank is a standard Veristack TCR type salve, which is indirectly light-triggered. it is made up of series connected thyristors in an anti-parallel DE&S Project 00153.00.0009.07.00000 Page 7
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 configuration, four (4) thyristors in series per phase. The thyristors are 4 inches in diameter, and have a maximum continuous current rating of 2,000 Amps. Firing pulses for the thyristors are sent from the SVC control, PHSC system, and the associated Valve Based Electronic (VBE) units via fiber optic links to the Thyristor Electronic (TE) units for each thyristor potential level. These units then convert the light signal from the VBE to electric pulses that are used to trigger the thyristors. The thyristor valves are water cooled. Approximately 95 % of the heat losses from the thyristor valves are dissipated through the water cooling system. The remaining 5 % of heat losses are dissipated into the surrounding air. The TCR thyristor valve is protected against overvoltage by a forward protection, break-over diode (BOD) on each thyristor level. The BOD will cause the thyristor electronic unit to , trigger the associated thyristor when a substantial overvoltage is petected across the thyristor. The TCR bank is continuously controlled from 0 to its full inductive output of 21.5 MVAR, by varying the firing angle of the associated thyristor valve. The TCR will generate harmonics due to the fact that it has a non-zero firing angle for the thyristor valve. Figure 16 is a plot of each harmonic as a function of the firing angle. The triplen harmonic currents, or harmonics of zero sequence characteristic, i.e.,3'd,9*,15*, etc., are not detectable outside the TCR bank in a balanced .iystem. The 5* and 7* harmonics are filtered out by the harmonic filter bank discussed in section 2.5. Therefore, the TCR generates minimal harmonics on the three phase system. The TCR is designed such that full system capacity is possible with the failure of up to one thyristor valve. 2.4 THYRISTOR SWITCHED CAPACITOR (TSC) B ANK The TSC bank is a three-phase, delta connected system, rated 21.0 MVAR capacitive at 4.16 kV. The major components of the TSC bank are a three phase disconnect switch (Table 18), , capacitor banks (Table 19), a surge suppression inductor (Table 20) and five levels of anti- { parallel thyristor valves. A three line diagram of the TSC is shown in Figure 17. I The capacitor stacks in the TSC bank are of the "Open" stack type, made up of capacitor 1 units connected in series and parallel to obtain the required MVAR rating. The capacitors are i of film design with non-PCB dielectric fluid or impregnate. The capacitors are intemally i fused, and have built-in discharge resistors. l The thyristor valve for the TSC bank is a standard TSC type valve, which is indirectly light-triggered. It is made up of series connected thyristors in an anti-parallel configuration, six (6) thyristors in series per phase. The thyristors are 4 inch in diameter and have a maximum continuous current rating of 2,000 Amps. ! As in the TCR, firing pulses for the thyristors are sent from the SVC control, PHSC system, and the associated VBE units via fiber optic links to the TE units on each thyristor potential DE&S Project 00153.00.0009.07.00000 Page 8
Illinois Power Company SVC Design Repon Clinton Power Station Revision 0 level. These units then convert the light signal to electric pulses that are used to trigger the thyristors. The thyristor valves are water cooled. Approximately 95 % of the heat losses from the thy-ristor valves are dissipated through the water cooling system. The remaining 5 % of heat losses are dissipated into the surrounding air. The TSC thyristor valve is protected against overvoltage by means of surge arresters connected across the valve. The TSC bank is either continuously "ON" or continuously "OFF." Therefore there is no generation of harmonic currents. By usir;g a thyristor valve, instead of circuit breaker, for switching the TSC bank in and out, the time lag for switching is insignificant. Furthermore, by "remynbering" the point (i.e. positive or negative voltage) where the TSC bank was switched out, there is no capacitor discharge waiting time before the TSC bank can be switched in again. The thyristor vaive control will switch in the TSC bank at the same voltage polarity as it was switched out. When a capacitor bank is initially connected to a system, a large current surge occurs. If I undamped, this current surge could potentially damage a thyristor valve. To prevent this, a small reactor is always placed in series with the thyristor valve and the capacitor bank. This reactor is typically tuned to the 4.5* harmonic frequency. An additional measure to prevent current surges through thyristor valves from becoming too large, the thyristors are only fired at zero voltage crossings. This provides almost transient-free switching, which saves the thyristor. Note however that this also prevents the continuou.s wwol of the TSC banks. As shown in Figure 17, the capacitors in each phase of the TSC bank are configured in a double "H" arrangement. Each leg contains three (3) capacitor units, for a total of 24 units per phase. The reason for this double "H" arrangement, as opposed to a single "H" arrangement, is that the energy dissipation from each leg would be excessive in case of a short circuit if each leg contained six (6) capacitor units. During the installation and commissioning process of the TSC bank, the capacitor units are balanced such that the current through the current transformer in the center connection of l each "H" arrangement is at, or very c!ca to, zero. If any capacitor unit develops an internal failure, the capacitance in that leg will change, and there will be a shift in current distribution i between the legs in the "H". This causes a current imbalance in the center connection. Depending on the amplitude of this unbalance current, an alarm or a time delayed trip action ; will be triggered. i 2.5 HARMONIC FILTER CAPACITOR BANK The harmonic filter capacitor (FC) bank is a three phase, ungrounded wye connected bank, l rated 7.5 MVAR capacitive at 4.16 kV. The filter bank is divided into two branches. one ' single-tuned 5' harmonic branch and one broader-tuned 7th harmonic / high-pass branch. The DE&S Project 00153.00.0009.07.00000 Page 9 l
lilinois Power Company SVC Design Repon Clinton Power Station Revision n major components of the filter bank are a disconnect switch (Table 21), inductor (Table 23), capacitor banks (Table 22) and a resistor (Table 23) in the 7* harmonic branch. The filter bank is designed to suppress the harmonics generated by the six-pulse operation of the TCR and minimize possible resonance with the rest of the system. A three line diagram of the FC is shown in Figure 18. The filter rating and nuing is discussed in reference 5.3.2. The capacitor stacks in the filter branches are of the enclosed "SIKAP" design type, made up l of capacitor units connected in series and parallel to obtain the required MVAR rating. The capacitors are of film design and have non-PCB dielectric fluid or impregnate. The capacitors are internally fused, and have built-in discharge resistors. During the installation and commissioning process of the filter branches, the capacitor units are balanced such that the current through the current transformer in the neutral connection is at, or very close to, zero. If any capacitor unit develops an internal failure, the capacitance will change in that leg and there will be a shift in current distributjon between the legs, causing a current imbalance in the neutral connection. Depending on the amplitude of this I current imbalance, an alarm or a time delayed trip action will be triggered. Each filter branch is protected against thermal overload. The broader-tuned 7* harmonic / High-Pass branch contains a resistor in parallel with the filter reactor for each phase. These resistors have separate current transformers (cts) for monitoring resistor overload as well as an open circuit. The protective function is described in section 2.6.5.3 of this report. 2.6 PROGRAMMAbt E HIGH SPEED CONTROLLER (PHSC) The SVC control system is comprised of a programmable high speed controller (PHSC), and valve control system. The PHSC provides the control and protection features. The valve control system links the PHSC to the thyristor valves (Figure 20).
- 2. 6.1 PHSC Overview
, The PHSC is a closed loop control system for the SVC. The main components of the PHSC are: digital and analog input modules, digital output modules, and various processing units (sequence of events recorder, fault recorder,1/0 processor, fault monitor, & central processor). Tne PHSC monitors the following parameters:
- TSC line current
. TSC valve current
. TSC capacitor unbalanced current
. TCR line current
. TCR valve current
. Filter resistor current
. ERAT transformer current e SVC output current
. SVC output voltage l
DEAS Project 00153.00.0009.07.00000 Page 10
( lilin:is Power Company SVC Design Report Clinton Power Station Revision 0
- SVC output breaker position e
4.16 kV buses I A, IB, l Al, IB1, and ICI bus supply breaker positions (via a PLC interface located in the plant) e EDG breaker position, and EDG synch switch "ON" position (via a PLC interface located in the plant) e Control signal to start and stop the SVC from the control room
- Plant protective relay trips The PHSC uses these inputs to control the 4.16 kV bus voltage at the specified setpoint, to control SVC operation for parallel power source conditions, to provide a
! controlled start up, shutdown, and to provide trips to the SVC output breakers for PHSC, TCR , TSC and FC branch failures. The PHSC controls the SVC output voltage by determining the firing angle for the TCR and determining when the TSC thyristors should be on or off. This is accomplished by comparing the bus voltage to a setpoint contained in the central ! processor (CPU-1). The error signal from this comparison is used to determine the firing angle for the TCR thyristor and whether the TSC thyristor should be on or off. The demand for a firing signal is transmitted via the data bus to the TCR and TSC VBE. l 2.6.2 PHSC Control with EDG Paralleled to Ofsite Source Plant surveillance procedures require the EDO to be connected to the offsite source at l least once a month, and operated for at least an hour. They also require a test once
- every refueling outage with the EDG connected to the offsite source for 24 hours.
The SVC can be operated in parallel with the EDO. As the VAR demand on the EDG is changed, the SVC will modulate the TCR and control the switching of the TSC to l maintain the bus voltage at the required setpoint. Therefore there is no need to i modify the control philosophy of the SVC when the EDO is paralleled. However, to i minimize the impact of system failures, the PHSC will freeze the SVC at the current reactance value when an EDO is paralleled with its corresponding SVC. This ensures that the PHSC will not respond to bus voltage changes until the EDG breaker opens. l Note that only the SVC that is paralleled with the EDG is will freeze at the current l reactance value, the other SVC will operate normally. The freeze signal is derived from auxiliary contacts on the EDG output breaker, and the Class 1E bus feeder ( breakers. The interface between the Class 1E circuit breakers and the SVC is l accomplished using optical isolators to segregate the Class 1 E system from the non-Class lE SVC. The freeze signal is derived in the plant based PLC. l l DE&S Project 00153.00.0009.07.00000 Page11
lilinois Power Company SVC Design Repon ! Clinton Power Station Revision 0 l l 2.6.3 PHSC Control with RA T Paralleled to UA T Non-Class 1E 4.16 kV buses 1 A and 1B (Figure 7) can be powered from either the UAT or the RAT. As discussed in section 1.2.1, a momentary condition can occur during a manual transfer when the RAT and UAT bus supply breakers are both closed. During this condition, the RAT SVC will be paralleled with the main generator. To minimize the possibility of control instability the PHSC will freeze the RAT SVC at the reactance value it had at the instant the parallel connection was made. This action will also minimize circulating currents flowing between the two sources. Once the paralleled path is broken, the PHSC will retum to controlling the SVC bus voltage. This freeze logic signal is provided by the plant based PLC. 2.6.4 PHSC Control With RA T Paralleled to ERA T Class IE 4.16 kV buses l Al, IBl and ICI (Figure 7) can be powered from either the RAT, ERAT or the EDG. As discussed in section 1.2.2, a momentary condition can occur during .a manual transfer were the RAT and ERAT bus supply breakers are both closed. During this condition the RAT SVC will be paralleled with the ERAT SVC. To minimize the possibility of control instability, the RAT PHSC will freeze the RAT SVC and the ERAT PHSC will freeze the ERAT SVC at the reactance values each had at the instant the parallel was made. This action will also minimize circulating currents flowing between the two sources. Once the paralleled path is broken, the each PHSC will return to controlling the SVC bus voltage. The control interface between the Class IE circuit breakers and the SVC is accomplished using optical , isolators to segregate the Class 1E system from the non- Class IE SVC, and the freeze logic is provided by the plant based PLC. 2.6.5 PHSC Protection The PHSC provides the first line of defense for the SVC and minimizes the impact of { SVC failures on the plant 4.16 kV system. On a detection of a fault, the PHSC sends ' a trip signal to both trip coils of each SVC output breaker (52-1 and 52-2) via lock-out relays located in the PHSC control cabinet. Table 3 provides details on the PHSC protection of the TSC, Table 4 provides details on the PHSC protection of the TCR . 2.6.5.1 TCR and TSC Bank Protection Both the TSC end TCR banks have overcurrent protection schemes implemented in the PHSC control system. Each phase in the TCR and TSC banks is protected with semi-inverse time characteristic protection, as well as thermal overload protection, each with an alarm and trip stage. There is also instantaneous overcurrent protection for the current in the banks. Trip activation is within a half cycle. The sum of the current in the delta branch nodes must be zero. If this condition is not met, a trip signal will be generated. The sum of the current in the bank must also be zero, otherwise a trip signal is generated. Detection of over-current in either the TCR or TSC thyristor valves will initiate continuous firing of the thyristors until the main SVC circuit breakers open. DE&S Project 00153.00.0009.07.00000 Page 12
Illin:is Power Company SVC Design Report Clinton Power Station
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There is a current limiter control function for the TCR bank that detects small and siew increases in over-current in the TCR. In such cases the PHSC system will reduce the current back to its nominal value. 2.6.5.2 TSC Capacitor Unbalance Protection The capacitor stacks in each TSC phase are arranged in double H configurations. A defective element in a capacitor unit will create an unbalance current that is monitored by the PHSC system. The monitored unbalance current is filtered to represent the fundamental component only. There is a compensation function in the PHSC system for the natural unbalance current in the capacitor stack. The alarm level of the unbalance current is reached by an integrating time function and the trip level is detected J with a semi-inverse time characteristic function. 2.6.5.3 Filter Bank Protection ,. For the filter capacitor, the PHSC only monitors the current through the 7* harmonic filter resistor. It will initiate a trip of the SVC ifit detects zero current or an overcurrent in the resistor leg of the filter. Zero current is an indication of an open circuit failure of the resistor. The overcurrent trip is to provide thermal overload protection for the reactor. The protection of the capacitors in the 5* and 7* harmonic filters is provided by SVCPS sub-system B, which is discussed in section 2.9 of this report. 2.6.5.4 Voltage Protection The PHSC system monitors the phase-to-ground and phase-to-phase voltages on the main SVC bus for any abnormal condition, caused by high voltage on the bus or by incorrect operation of the SVC. The protection function is divided in two stages; one slow, but more sensitive, rtage and one fast, but less sensitive, stage. 2.6.5.5 Thyristor Failures The Thyristor Monitor (TM) monitors the status of the TSC and TCR thyristors and will initiate.a trip signal to the PHSC for failures of thyristors. A description of the TM is in section 2.7.7. 2.6.5.6 PHSC Failures The PHSC is a self checking system. It will initiate a trip of the SVC on loss of power, and loss of power to a module. 2.7 VALVE CONTROL SYSTEM
- 2. 7.1 Overview The valve control system links the PHSC to the thyristor valves (Figure 20). It consists of: "
Valve based electronics (VBE) for TCR e Valve based electronics (VBE) for TSC DE&S Project 00153.00.0009.07.00000 Page 13
I i lilinois Power Company SVC Design Report Clinton Power Station Revision 0 I , . Thyristor monitor (TM) for TCR and TSC I' e Fiber optical cables
. Thyristor electronics (TE) board for each thyristor level The valve control system performs the following tasks: l
. Simultaneous triggering of all TCR thyristors in series per valve branch in response to the firing pulses from the PHSC. 1 1
. I Voltage when switching on the TSC, ensuring uninterrupted current flow, as long as the TSC is in the on state.
i e Bridging the voltage potential between each thyristor level and ground potential. e l Protection of the thyristors in the TCR excessive voltages by means of a BOD { I backup circuit. I e Detection and lccalization of defective thyristors and defective TE-boards e Detection and localization of BOD firings in the TCR l
. Detection and localization of defective light transmitters
- 2. 7.2 TCR Thyristor Electronics Every thyristor pair consisting of two anti-parallel thyristors with the same cathode '
potential, and is equipped with one TE. The TE consists of two independent firing l channels, one for the thyristor in positive direction and one for the thyristor in negative direction. There is one channel for feedback to the TE from the TM, indicating that the are both operating. The required energy to power the TE is derived from an RC-snubber circuit across the thyristor. If the thyristor is defective, i.e. short-circuited, no report pulses can be sent back to VBE, because there is no energy on the TE board. The TE decodes the light-pulse signal transmitted by the fiber optic cables. There are two states in which the TE can be:
- Firing Stage The firing state is initiated by a double pulse. The TE generates a gate pulse, if
! the thyristor voltage is > 100V, and if the power supply of the TE is sufficient. If l the thyristor voltage raises to a dangerous level, the thyristor will be fired via the i BOD circuit, thus protecting the thyristor effectively when a normal firing pulse is missing. At each BOD firing a report pulse is sent back to VBE.
. Blocking State The blocking state is initiated by a single pulse. The firing readiness is terminated until the next double pulse arrives. After each single pulse, a report pulse is sent ;
back to the VBE. When energizing the valve, the TE is set to the blocking state. DE&S Project 00153,00.0009.07.00000 Page 14 l
lilinois Power Company SVC Design Report Clinton Pov er Station Revision 0
- 2. 7.3 TCR Valve Base Electronics The VBE receives the demand for a firing signal from the PHSC. The VBE converts this demand into light pulses that are transmitted over the fiber optical cable to the TE.
- 2. 7.4 TSC Thyristor Electronics Every thyristor pair consisting of two anti-parallel thyristors with the same cathode potential is equipped with one TE and with two power supplies. The TE consists of two independent firing channels, one for the thyristor in pcsitive direction and one for <
the thyristor in negative direction. There is one channel for feedback to the TE from ! the TM, indicating that the are both operating. l k When the TSC is energized, the required energy to power the TE printed circuit board I (PCB) is derived from a CT loop, which is powered by the valve current. One main I CT powers the level cts of several thyristor levels. In case of a thyristor loss, the TE
' l is still energized.
When the TSC is off, the required energy to power the TE PCB is derived from the RC-snubber circuit across the thyristor. If the thyristor is defective, i.e. short-circuited, no report pulses can be sent back to VBE, because there is no energy on the TE board. The TE decodes the light-pulse signal transmitted by the light guides. There are two states in which the TE can be:
- On State The on state is initiated by a triple pulse. The TE generates a gate pulse, if the thyristor voltage is 2: 50V. A single pulse transmitted to the TE will not affect the state. After each single pulse received, a report pulse (status pulse) is sent back to VBE, if the TE has detected a positive voltage peak across the thyristor before firing. If a thyristor is short-circuited, it can not create the 50V-peak and therefore no status report pulse can be sent back to VBE, even if there still is energy on the TE board.
- OffState The off state is initiated by a double pulse. No gate pulses are generated any more. A single pulse transmitted to the TE will not affect the state. After a double pulse, a report pulse (voltage pulse) is sent back to the VBE, when the voltage across the thyristor is positive. These voltage pulses are used to control !
the VBE switching on the TSC. After a single pulse, a report pulse (status pulse) is sent back to VBE, if there is sufficient energy on the TE. The voltage report pulse is blocked after a single pulse. The status pulses are used for monitoring ! purposes.
- 2. 7.5 TSC Valve Base Electronics The VBE receives the ON/OFF signal, and one phase synchronization signal per phase from the PIISC. The VBE converts this demand into light pulses that are l transmitted over the fiber optical cable to the TE. _
DE&S Project 00153.00.0009.07.00000 Page 15
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lilinois Power Company SVC Design Repon Clinton Power Station Revision 0 { i
- 2. 7. 6 Light Signal Transmission The pulse telegram is sent through an emitter light-guide bundle, as shown in Figure 1 17, from VEE to TE. The two transmitters in VBE send their pulse telegram I simultaneously into two light guides. In the light mixing point the two channels are l opticallyjoined and distributed evenly into 5 or 7 light guide arms. The pulse
{ telegram is then sent to each TE. In the other direction, report pulses from each TE ' are sent to the light receivers in the VBE by means of report light-guide bundles, which are point to point connections. The light guide bundles are of high dielectric quality, since they have to isolate the voltage potential between each thyristor level and to ground. 2.7.7 Thyristor Monitoring The TM for one TCR and one TSC consists of a multipurpose processor and a digital 1/0 device. 1 i The TM checks each phase of the TCR and the TSC alterlately with the followmg { tests, when the firing pulses are released (TCR) or the TSC is on: '
- Status test BOD test (Only if a < approx.150 and only in TCR) l
- Transmitter test every 5 minutes l
. Receiver test every 5 minutes The TM checks each phase of the TCR and the TSC alternately with the following tests, when the firing pulses are blocked (TCR) or the TSC is off:
. Status test
. Transmitter test
- Receiver test The. time interval for the additional tests can be adjusted. The different test modes are:
Status Test: The TM checks whether each TE sends a report pulse back to VBE after receiving a single pulse. The single pulse from VBE is always sent through both light transmitters. The missing of the status indication can have different causes:
. Thyristor defective (no power supply for the TE)
- TE defective
- Receiver in VBE defective
. Light guide is defective DE&S Project 00153.00.0009.07.00000 Page 16
lilinois P:wer Company SVC Design Report Clinton Power Station Revision 0 BOD Test: The TM checks whether a TE sends a report pulse after receiving a double pulse (Only the TCR is equipped with a BOD circuit). This I would indicate a BOD firing. Usually a defective TE is not able to fire the thyristor, so the BOD circuit becomes active. i Transmitter Test Channel A and B: Due to lower priority, these two test modes are performed only once in I 5 minutes, when the firing pulses are released, or the TSC is on respectively. A single pulse is sent only through one of the two light transmitter channels to TE. If the selected channel is defective, the TE can not sent a report pulse back to VBE. i Receiver Test Set and Reset: Due to lower priority, these two test mode 3 are performed only once in 5 minutes, when the firing pulses are released, or the TSC is on l respectively. Each receiver memory is either set or reset electrically I and TM checks the right status of the memory. A failed receiver test indicates a faulty receiver. The TM combines the results of the different tests and generates a failure diagnose. The TM is able to create the following alarm and trip signals. TCR TSC TRIP (Common Trip) TRIP (Common Trip) THYR TRIP THYR TRIP BOD TRIP THYR ALARM THYR ALARM BOD ALARM VALVE ALARM VALVE ALARM TM DISTURBED TM DISTURBED TM F.6 LED TM FAILED 2.8 SVC mimic BOARD The SVC control system panel comes equipped with a mimic board for operator control and l monitoring. This mimic board contains a mosaic layout of the SVC (i.e., a single line representation), a number of analog meters, indications of breaker, disconnect switch and grounding switch status, a number of push button controls, and numerous alarm and trip l LEDs. The analog meters display the following information: l e Total SVC MVAR Generation / Consumption
- Measured SVC Bus Voltage
- DE&S Project 00153.00.0009.07.00000 Page 17
lilinois Power Company SVC Design Report Clinton Power Station Revision 0
- Measured Current in the TCR Bank
)
- Measured Current in the TSC Bank The icons for the disconnect and grounding switches and the main breakers contain LEDs for status indication. The Red LEDs of each icon are lit to indicate " Closed" position, and the Green LEDs are lit to indicate "Open" position of the associated switches or breakers. The disconnect and grounding switches are manually operated.
Push buttons on the mimic perform the following operations:
"ON" Starts the SVC in controlled manner. The logic first verifies that voltage is established on the main 4.16 kV bus, the PHSC control system is operating, the valve cooling system is operating, and that no trip or major alarm conditions exist.
The control logic then closes the main circuit breakers to energize the SVC bus as well as the harmonic filter bank. This also enables theTCR bank to operate to counteract the capacitive MVAR generation from the harmonic filter bank and to respond to the PHSC demand for reactive power to support the 4.16 kV system. l l
"OFF" Stops the SVC in a controlled manner by ramping the TSC and TCR banks to )
zero MVAR output and then blocks the thyristor firing pulses. As soon as the firing pulses are blocked, the control logic sends a trip signal to the main breaker.
"ESOFF" (Emergency Shut Off) This is an emergency shutoff which bypasses the PHSC SVC control and sends a trip signal directly to the main circuit breakers.
"SEL" Select button for the analog voltmeter. It allows the operator to check phase-to-phase and phase-to-ground voltages on all three phases.
"R" Reset button for the alarm and trip indication panel.
"LT" Lamp test The mimic contains 12 " Red" LEDs for trip information and 12 " Yellow" LEDs for alarm indication. The alarms and trips are confirmed and then reset by the "R" reset button.
2.9 SVC PROTECTION SUB-SYSTEMS (SVCPS) The SVC Protection Sub-systems (SVCPS) protect the 4.16 kV system from SVC failures ! and provides protection for the 5th ggg 7th harmonic filter capacitors. The SVCPS is comprised of two channels (A & B) of protective relays (Figure 21 and Figure 22). Each of ; the sub-systems has relays to detect the following conditions: i e Overcurrent
. Negative sequence
. Undervoltage ( phase to phase & phase to neutral) l DE&S Project 00153.00.0009.07.00000 l Page 18 i
lilinois Power Company SVC Design Repon Clinton Power Station Revision 0
. Overvoltage (phase to phase & phase to neutral)
. Phase unbalanced
. Harmonics Sub-system A also has the protective relays for the protection of the capacitors in the 5* and 7* harmonic filter bank. Both sub-systems generate a trip signal when any of the above conditions are detected.
Each sub-system will pick up an independent lockout relay and trip breaker 52-1 and 52-2 through a trip coil powered by a battery associated with the sub-system. Therefore each breaker will receive two independent trip signals. One trip signal to the sub-system A trip coil and another trip signal to the sub-system B trip coil. 2.9.1 Overcurrent, Negative Sequence 'Undervoltage, & overvoltage Protection Two independent DPU-2000R relays provide overcurrent,' negative sequence undervoltage, and overvoltage protection. The following functions in the DPU 2000R will be used: Phase Time Overcurrent (51P) e Ground Time Overcurrent (SIN) e Phase Instantaneous Overcurrent (50P) e Ground Instantaneous Overcurrent (50N) e Negative Sequence Time Overcurrent (46)
- Undervoltage (27)
- Overvoltage (59)
)
The relay setpoints will be based on the following criteria: 2.9.1.1 Phase Time Overcurrent 51P The Pickup Analytical Limit shall be greater than or equal to the analytical limit of the PHSC phase overcurrent pickup, greater than the SVC continuous and non-continuous (inrush) rated phase current, and less than the maximum available SVC phase short circuit current. The Dropout Analytical Limit shall be greater than or equal to the analytical ; limit of the PHSC phase overcurrent dropout, and greater than to the SVC l continuous and non-continuous (inrush) rated phase current. Time Delay Analytical Limit shall be greater than the PHSC phase overcurrent time delay at all times, and less than the time to assure that no equipment / cable damage or 4.16kV bus protective trips occur. DF&S Project 00153.00.0009.07.00000 Page 19
lilinois Power Company SVC Design Rrport Clinton Power Station ' Revision 0 2.9.1.2 Ground Time Overcurrent SIN , The Pickup Analytical Limit shall be greater than or equal to the analytical limit of the PHSC ground overcurrent pickup, greater than the SVC continuous and non-continuous (inrush) rated ground current, and less than the maximum available SVC neutral / ground current capability. The Dropout Analytical Limit shall be greater than or equal to the analytical limit of the PHSC ground overcurrent dropout, and greater than the SVC continuous and non-continuous (inmsh) rated neutral / ground current The Time Delay Analytical Limit shall be greater than the PHSC ground overcurrent time delay at all times, and less than the time to assure that no l equipment / cable damage or 4.16kV bus protective trips occur. 2.9.1.3 Phase Instantaneous Overcurrent 50P The Pickup Analytical Limit shall be greater than 6r equal to the PHSC phase overcurrent trip setpoint ,3reater than the SVC phase inrush current, and less , than the maximum available SVC phase short circuit current. The Dropout Analytical Limit shall be greater than or equal to the analytical limit of the PHSC phase overcurrent dropout, and less than the maximum l available SVC phase short circuit current. 2.9.1.4 GroundInstantaneous Overcurrent 50N The Pickup Analytical Limit shall be greater than or equal to the PHSC ground overcurrent trip setpoint, greater than the SVC ground inrush current, and less than the maximum available SVC neutral / ground short circuit current. The Dropout Analytical Limit shall be greater than or equal to the analytical limit of the PHSC ground overcurrent dropout, and less than the maximum available SVC ground short circuit current. 2.9.1.5 Negative Sequence (46) The Pickup Analytical Limit shall be greater than or equal to the analytical limit of the PHSC pickup setpoint, less than the existing analytical limit pickup setpoint of the 4.16kV bus negative sequence current, and less than the maximum acceptable SVC negative sequence current. 2 The Dropout Analytical Limit shall be greater than or equal to the analytical limit of the PHSC negative sequence current protection dropout, and less than ! the maximum expected SVC negative sequence current. The Time Delay Analytical Limit shall be greater than the PHSC negative sequence time delay, and less than the existing 4.16kV negative sequence time delay, f h I DE&S Project 00153.00.0009.07.00000 Page 20 ; i l
lilintis Powtr Company SVC Design Report Clinton Power Station Revision 0 2.9.1.6 Undervoltage (27) The Dropout Analytical Limit shall be less than or equal to the analytical limit of the PHSC trip setpoint, greater than the analytical limit of the existing trip setpoint of the DGR. The Pickup Analytical Limit shall be less than or equal to the analytical limit of the PHSC undervoltage pickup, and greater that the analytical limit of the DGR undervoltage pickup. The Time Delay Analytical Limit shall be Greater than the PHSC j undervoltage time delay, and greater than the existing 4.16kV undervatage s time delay. 2.9.1.7 Overvoltage (59) The Pickup Analytical Limit shall be greater than or equal to the analytical limit of the PHSC pickup setpoint, less than the arfalytical limit of the existing trip setpoint of 4.16kV bus overvoltage, and less than the maximum acceptable 4.16kV bus voltage of 4,300V. The Dropout Analytical Limit shall be greater than or equal to the analytical limit of the PHSC dropout setpoint, and less than the analytical limit of the maximum acceptable SVC voltage The Time Delay Analytical Limit shall be greater than the PHSC overvoltage delay time, and greater than the existing 4.16kV overvoltage delay time. 2.9.2 Voltage Phase Unbalance Protection (46) Redundant voltage phase unbalance protections are included in the SVC back-up protection scheme to detect and protect against unbalances due to SVC miss-op-eration. The protection is implemented in a type ABB 60Q phase unbalance relay. Unbalanced voltage conditions may cause significant overheating in rotating equipment, even at relatively small voltage unbalances. The phase with the highest current due the voltage unbalance will experience a temperature rise of approximately twice the square of the percent voltage imbalance. (reference 5.5.1). 2.9.3 Harmonic Protection The SVCPS provides redundant harmonic protection with two independent Square D Power Monitor Type CM-2350. They monitor the total harmonic distortion (THD) in current and voltage will generate alarm and trip signals for excessive THD. Harmonic currents can cause (1) overheating of rotating equipment, transformers, and current-carrying conductors, (2) premature failure or operation of protective devices (such as fuses), (3) harmonic resonance conditions on the electric power system, which can further deteriorate electrical system operation, and (4) metering inaccuracies. DE&S Project 00153.00.0009.07.00000 Page 21
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 The degree to which harmonics can be tolerated is determined by the susceptibility of the load (or power source) to them. The most susceptible type of equipment is that whose design assumes a nearly perfect sinusoidal fundamental input. This equipment is frequently in the categories of communication or data processing equipment. Conversely, most motor loads are relatively tolerant of harmonics. A harmonic l tolerance standard for electrical equipment manufactures does not exist but IEEE limits are provided for individual electrical customers and utilities. The limit for normal operation at voltages less than 69kV is 5% THD. This limit can be exceeded by 50% during startup or other unusual conditions. l i The Square D Power Monitor Type CM 2350 is capable of multiple functions including:
. Harmonic magnitudes and angles through the 31" harmonic.
Cycle-by-cycle monitoring for voltage sags, swells, and interruptions.
- User-programmable threshold setpoints, e User-programmable time-delays (from % cycle to 255 cycles).
Internal and/or extemal triggering of waveform capture. l e Actual waveforms (12 cycles) can be captured coincident with disturbance, including both pre- and post-event information e Event log maintains a record of all disturbances, including time /date.
- Event counter keeps track, by type, or the number of disturbances.
The criteria for setting the Harmonic relay is listed below: 1 The Pickup Analytical Limit shall be less than the maximum acceptable harmonic tolerance of all safety related equipment, and less than the 5% THD tolerance standard (reference 5.4.1). The Dropout Analytical Limit shall be less than the maximum acceptable SVC harmonic generation. 2.9.4 f* And 7"/HP Harmonic Filter Branch Protection Each of the 5* and 7*/HP harmonic filter branches utilizes the SPAJ 160C type protection relay as primary protection. This relay is in only in sub-system A of the SVCPS. Current in the filter capacitors contains a considerable harmonic component, giving distorted voltages across the capacitors. This distortion can impose excess voltage stresses on the capacitor units. A three-phase capacitor overvoltage protection is therefore included. This protective function in the SPAJ 160C integrates the capacitor current to form a true replica of the voltage across the capacitor bank. The overvoltage protection has inverse time characteristic to allow for short time overloads. DE&S Project 00153.00.0009.07.00000 Page 22
Illinois Power Company SVC Design Repon Clinton Power Station Revision 0 ( l The capacitors units of the capacitor banks are arranged in a Y -Y configuration to enable unbalance detection. Current unbalance protection is provided in the common neutral in order to detect faults in the capacitor circuits, and protect individual capacitor units from overvoltage. This protective function in the SPAJ 160C has an alarm level and a trip level. The capacitor banks can be kept in service at the alarm level since it is typically only a small unbalance current due to one or two blown internal fuses. The capacitor units are made up of a number ofinternal capacitor elements, typically 30 - 40 capacitor elements for each unit. Each of those elements is protected by its own internal fe e. 2.10 SVC DC POWER DISTRIBUTION SYSMM The de power system for the SVC is composed of two independent 48 VDC systems (Figure 19). Each system is designed to carry the total DC load for at least eight hours following a loss of AC power. The SVC will continue to operate and be capable of being tripped with the complete loss of one of the 48 VDC systems. There are no electrical connections l between the two batteries during normal operation However, note that these two batteries can manually be connected under emergency conditions. Only one of the DC systems is required to shutdown the SVC. The DC system provides sub-system A power to one trip coil, and sub-system B power to the second trip coil in each output breaker. Channel A and channel B power are provided to the 48 to 48 VDC power supplies and the 48 to 24 VDC power supplies that operate the PHSC. l The output of the power supplies are auctioneered. Therefore the SVC will continue to operate with the loss of a battery system or the loss of a power supply Each battery charger has an automatic system test feature. The automatic system test feature will lower the output voltage of the charger to below the battery terminal voltage to verify that the battery has the capacity to cany the load. After a specified time period the charger will automatically increase its voltage to recharge the battery and provide power the de loads. l 2.11 SVC AC POWER DISTRIBUTION SYSTEM 1 There are two (2) 480 V, three phase power sources for each SVC system, one is the normal source, and the other serves as the back-up source. The normal source is a dedicated 75 kVA,4.16 kV/480 V transformer connected to the SVC 4.16 kV bus. The back-up source is j from a Motor Control Center off the plant electrical distribution system. An auto transfer takes place from the normal to the standby source on loss of voltage. All SVC loads, with i the exception of the two SVC cooling water pumps, are fed from either the normal or standby source. The SVC has two 100% capacity cooling water pumps, one connected to the normal l source, and the other connected to the standby source. These pumps do not need to be I transferred since they provide 100% capacity each, and therefore the available power source will determine which pump is in operation. i DE&S Project 00153.00.0009.07.00000 Page 23
lllinois Power Company SVC Design Report Clinton Power Station Revision 0 2.12 SVC CONTROL BUILDING FIRE PROTECTION SYSTEM The fire protection system consists of four elements: e main fire alarm control panel (FACP) and components l e incipient fire detection system (IFD)
+ water mist suppression system e FM-200 gaseous suppression system A description of each element and its sequence of operation under alarm, trouble and normal l conditions is provided below.
2.12.1 Main Fire Alarm ControlPanel(FACP) l The main fire alarm control panel is the focal point for operation of the entire system. It serves as the NFPA 72 approved controller for supervision and operation of the l detection and suppression systems. Two zones of conventional detection provide input to the panel (one zone for interior smoke detection in the SVC control cabinet and one zone of Rate Compensated Heat Detection for the SVC building). Each of these zones provides one of the required cross-zoned detection signals to initiate a l suppression system release. The FACP also receives input signals from the 1FD panel for alarm and trouble conditions for the IFD two zones of detection (one zone for the SVC building and one zone for the interior of the SVC control cabinet). Annunciation devices for an alarm condition (bells and strobes) and suppression system activation (horns) exist to alert plant personal and provide status signals to the control room. Activation of any one zone of detection will result in an alarm condition (bells, strobes and annunciation in control room). Activation of both zones l within a cross-zoned scheme will result in a discharge alarm (horns and annunciation in the control room). Any off normal condition annunciates in the control room. The FACP itself will have all conduits enter from the bottom to lessen the likelihood of water intrusion. Upon activation of both zones a signal will be sent to the control room of the alarm condition and the local horns will sound. A signal is simultaneously sent to shut down both HVAC units and the SVC. This time delay of 60 seconds allows for proper shutdown of the SVC. The FACP also contains the suppression system releasing modules. These modules control the operation of the both the FM-200 and water mist suppression systems. l The FACP has a 120V AC power supply and an internal battery backup per NFPA
- 72. The battery backup is capable for operation up to 24 hours with an alarm period of 5 minutes at the end of this period.
DE&S Project 00153.00.0009.07.00000 Page 24 l l
Illinois Powtr Company SVC Design Report Clinton Power Station Revision 0 l 1 2.12.2 Incipient Fire Detection system (IFD) The IFD system has two zones of detection, one for the SVC building and another for i the interior of the SVC control cabinet. The IFD panel has a 120V ac power supply and an intemal battery backup per NFPA 72. The battery backup is capable for operation up to 24 hours with an alarm period of 5 minutes at the end of this period. The IFD system is an early waming incipient air sampling system, utilizing cloud chamber technology. This system provides early detection ofincipient products of combustion, by continuously monitoring detection points. There are three levels of alarm per zone that can be field adjusted for sensitivity. This panel is also supervised l for trouble conditions that will be transmitted to the FACP for annunciation. 2.12.3 Water Mist Suppression System l This system protects the entire, SVC building. The system is self-contained water based total flooding suppression system. The total amount,of water discharged via a nitrogen cylinder into the volume (per release) is 150 liters. There is a main and reserve supply which has to be manually initiated. 1 2.12.4 FM-200 Gaseous Suppression System This system protects the SVC control cabinet. The system is an gaseous total flooding system designed to NFPA standard 2001. 2.13 SVC THYRISTOR VALVE COOLING SYSTEM l The valve cooling system for each SVC is a standard system consisting of a combined pump / treatment skid with a built-in control system and outdoor cooling towers and piping. It also has measuring instrumentation for cooling media flow, temperature, pressure, level and conductivity. The valve cooling system is a closed system. The cooling medium is a mixture of de-ionized water and glycol. The medium is circulated through the outdoor cooling towers (or bypass i shunt), the pump / treatment skid, and thyristor valves (Figure 25). The cooling tower consists of radiators which allow cooling of the medium without contact l with open air. The outdoor cooling tower has three (3) cooling fans. Two fans provide 100% I capacity, with the third serving as a back-up unit. The valve cooling pipes are made of stainless steel, except for the cooling pipes in the thyristor valve assembly, where plastic type ; FEP pipes are used. The two cooling pumps are fully redundant. One is in normally in operation, while the other i is in standby mode. The redundant pump installation allows for testing and on-line maintenance. The pumps are automatically switched at regular intervals, typically once a week,in order to equalize the pump operating times. In case of pump failure, detected by loss of pressure or cooling medium flow, transfer from the failed pump to the standby unit is automatic. i i The thyristor valve cooling system is designed to be in continuous operation, independent of the mode of thyristor operation. The valve cooling control system continuously monitors the DE&S Project 00153.00.0009.07.00000 Page 25
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 l medium temperature. When this temperature drops below a pre-set value, typically 75 F l (24" C), the out-door cooling tower is automatically bypassed using two mechanically linked l valves which direct the cooling medium a shunt pipe on the pump unit. As the temperature l increases, the control system will adjust the position of the valves to gradually decrease the l flow through the shunt, and increase the flow through the outdoor cooling tower, in the limit reaching 100% flow through the cooling tower. The cooling control system will start cooling ' as on the cooling tower, one at a time, if the temperature exceed a preset value, typicall; 104* F (40 C). Cooling medium temperature and flow are continceasly monitored, and alum and trip signals will be generated in case of high cooling medium temperature, or low flow. Approximately 90% to 95% of the cooling medium circulates through the main loop, which include the TCR and TSC thyristor valves. The remaining 5% to 10% circulates through the water treatment plant, where it is de-ionized and de-oxygenated. The cooling medium conductivity is continuously monitored, with alarm and 'ip signa) generated for high conductivity. The pump / treatment skid contains an expansion vessel, a pressurized stainless steel tank, which maintains the cooling medium pressure in the entire valve cooling system, typically at a pressure of 7.2 psi (50 kPa), while allowing for expansion and contraction of the medium due to temperature changes. The system pressure and expansion vessel level are continuously monitored, with alarms generated for low level, and alarms and trip signals generated for high and low pressure conditions. l l I DE&S Project 00153.00.0009.07.00000 Page 26 1 i j
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 3 ELECTRICAL SYSTEM ANALYSIS 3.1 HARMONIC ANALYSIS l The TCR generates odd harmonics depending on the firing angle for the thyristor angle l (Figure 16). The TCR is symmetrically controlled and connected in a delta configuration. l Therefore the zero sequence harmonic currents will circulate in the delta and will not be seen on the 4.16 kV bus. The harmonic filter branch is designed to limit the THD that will be seen on the 4.16 kV bus. A harmonic analysis was performed to demonstrate that the SVC meets the recommendation presented in IEEE Standard 519-1992 (Reference 5.4.2) at the point of common coupling. The analysis was performed considering tolerances in the system frequency and negative sequence voltage and in the value of the capacitance and reactance in the TCR, TSC and harmonic filter bank equipment. The limits on total harmonic distortion are 5% for both
)
voltage and current. The harmonic analysis indicates that both th.e RAT and ERAT SVC
~
meet this requirement. 3.2 STEADY STATE LOAD FLOW ANALYSIS A set of steady state load flow analysis is being performed to determine the control range of i the SVC for minimum and maximum offsite voltage with varying plant load. The load flow ! analysis will verify that all equipment, cables, bus duct, switchgear, transformers, etc., from the offsite source to the safety and non safety buses are adequately sized for starting and running the required equipment. It will also verify that the SVC is capable of maintaining .he voltage within acceptable range. j l A steady state analysis is being performed for the ERAT to RAT parallel condition to insure ! that circulating currents will not trip the bus supply breakers in less than 5 seconds. j I l A steady state analysis is being perfom ed to determine the impact of the SVC tripping off line during grid overvoltage and undervoltage condition. The RAT c.nd ERAT tap settings will be calculated to ensure that overvoltage conditions downstream of these transformers will be at an acceptable level, in the event of an SVC trip during grid overvoltage conditions. If the SVC trips offline during grid degraded conditions, then the Degraded Grid Relay will provide protection for the safety related buses. 3.3 TRANSIENT LOAD FLOW ANALYSIS A transient LOCA sequence is being performed for both the RAT and ERAT offsite source with the SVC. This analysis will document that the offsite source will accelerate and operate all of the required safety related loads at minimum expected grid conditions. A transient bus transfer analysis is being performed to demonstrate that the maximum motor voltages during the transfer are within the rating of the motors. 3.4 PROTECTIVE RELAY ANALYSIS The protective relay setpoints, overcurrent, undervoltage, overvohage, differential, etc, associated with the offsite source will be revised, if required, to operate correctly with the SVC. DE&S Project 00153.00.0009.07.00000 Page 27
1 lilinois Power Company ' SVC Design Report Clinton Power Station Revision 0 3.5 SHORT CIRCUIT ANALYSIS l A detailed short circuit analysis is being performed with the SVC to insure that all equipment is operating within its maximum allowable and interrupting rating for short circuit currents. l l l l i
)
t \ l l l l DE&S Project 00153.00.0009.07.00000 Page 28
lilin is Power Company SVC Design Repon Clinton Power Station Revision 0 4 FAILURE ANALYSIS The SVC PHSC Protection system, and the SVC protection sub-systems (SVCPS) provide protection to the SVC. The SVCPS sub-systems are independent, and mutually redundant, with the exception of protection for the 5* and 7* harmonic filter capacitors. The SVC PHSC Protection system provides protection for the TSC, TCR and the resistor in the filter capacitors. SVCPS sub-systems A and B protect the 4.16 kV bus from SVC failures and, and sub-system A provides a single channel of protection for the 5* and 7* harmonic filter capacitors. The SVC PHSC protection ; system along with the two sub-systems are designed to detect nnd mitigate the impacts of failures ! independently of each other. A failure in one system will not prevent the other system from detecting the failure and tripping the SVC. 4.1 OBJECTIVE The objective of the failure analysis is to determine the ability of the SVC to mitigate accidents that may cause e overvoltage '
. undervoltage e harmonics e short circuit j
l
- overload On the safety related 4.16 kV bus with failures in the TSC, TCR, FC, PHSC, AC and DC system power supplies.
4.2 FAILURE ANALYSIS Table 5, Table 6, Table 7, Table 8 and Table 9 document the results of the failure analysis for the TSC, TCR, FC, PHSC, RPS and power supplies. The tables indicate that no single failure of a component will prevent the SVC from being disconnected from the 4.16 kV system when required. I l l DE&S Project 00153.00.0009.07.00000 Page 29
. Illinois Power Csmpany SVC Design Report Clinton Power Station Revision 0 1
5 REFERENCES l 5.1 LICENSING DoCUAtENTS l l 5.1.1 Clinton Power Station TechnicalSpecapcations 5.2 DRAWINGSIANK12J 5.2.1 Clinton Power Station Drawings 5.2.1.1 E02-1AP99, Sheet 5, revision E 5.2.1.2 E02-1AP99, Sheet 6, revision G 5.2.1.3 E02-1AP99, Sheet 7, revision F 5.2.1.4 E02-1AP99, Sheet 8, revision G 5.2.1.5 E02-1AP99, Sheet 9, revision M t 5.2.1. 6 E02-1AP99, Sheet 10, revision P 5.2.1. 7 E02-1AP03, revision H 5.2.1.8 E02-1AP01 revision L 5.2.1. 9 E02-1AP40 revision H 5.2.1.10 E02-1AP41 revision H 5.2.1.11 E02-1AP42 revision E 5.2.1.12 E02-1AP43 revision E 5.2.1.13 E02-1AP44 revision F 1 5.2.1.14 E02-1AP45 revision F 5.2.2 ABB Drawings 5.2.2.1 CP1802-0001 revision 01 5.2. 2. 2 CP1802-0002 revision 01 5.2. 2. 3 CH1802-0001 revision 00 5.2.2.4 RK5240-0484 revision 00 5.2.2.5 RK5240-0485 revision 00 5.2.2. 6 RK5240-0486 revision 00
- 5. 2.2. 7 RK5240-0487 revision 00 DE&S Project 00153.00.0009.07.00000 Page 30 l
lilinois Power Company SVC Design Repon Clinton Power Station Revision 0 l 5.3 REPORTS AND_QALCULATIONS - 5.3.1 filinois Power Company Reports f 5.3.1.1 filinois Power Company Report, " Grid Voltage & Auxiliary Power Team Transmission System Voltage Study", DatedMay,1996 5.3.2 ABB Reports 5.3.2.1 ABB ETIReport No. 97-0219-30 Harmonic Filter Design Study
)
5.3.2.2 ABB ETIReport No 97-3019-75-R-1, Clinton SVC Sizing Study 5.3.2.3 ABB ETI Technical hiemo, insulation Coordination Requirements 5.4 INDUSTRY STANDARDS 5.4.1 ANSIStandards - l 5.4.1.1 ANSIC84.11995, " Electric Power Systems and Equipment Voltage Ratings \ (60 hertz)" i
- 5. 4.2 IEEEStandards l 1
5.4.2.1 IEEE Standard 519-1992, IEEE Recommended Practice and Requirementsfor ! Harmonic Control in Electrical Power Systems ! 5.5 TECifNICAL TEXTS AND VENDOR INSTRUCTION MANUALS 5.5.1 Technical Texts 5.5.1.1 Smeaton, Robert W., "Switchgear and Control Handbook", McGraw-Hill 5.5. 2 VendorInstruction Manuals 5.5.2.11MRA587219-MIB, ABB Distribution Protection Unit 2000R Instruction l Booklet. 5.5.2.2 Bulletin No. 3020lM9301R4/95, Square D Instruction Bulletin , PowerLogic Circuit Monitor Series 2000. l l i l v-1 DE&S Project 00153.00.0009.07.00000 Page 31
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 l TABLE 1: RAT & ERAT TRANSFORMER RATINGS RAT Ratings H Winding 345 kV grounded Y j 63 MVA at 65*C i X Winding 7.02 kV grounded Y 35 MVA at 65'C f Y Winding 4.26 kV grounded Y 28 MVA at 65 C
- LTC ERAT Rating H Winding 138 kV grounded Y '
30 MVA at 65 C l X Winding 4.26 kV grounded Y j i 30 MVA at 65"C l l l l l l l l DE&S Project 00153.00.0009.07.00000 Page 32
t r o 0 pn e o Ri s nvi ge isR e D C V S PE UC KR CU AO T T T BS T T T T A A A A A A A R R R _ R R R R E E E _ LE N AC _ O MR - I RU A B A B . T OO 1 I l I s A NS T T T T T T T M A A A A A A A R U U U U R R R O F N I & HG s u E S C N I B O AA TT A k A k A k A k A k A k A k V L CLR 0 8 0 8 0 0 0 0 0 K 8 8 8 8 8 3 3 9 S eg 6 U T P a D O NG N U EN A N RI V I T TRA A A A A A A A K NU R 00 0 0 0 0 0 0 4 OC 2 0 2 0 2 0 2 0 2 0 2 0 2 C 1 1 1 1 1 1 1 2 N E O L I B T A YA T T EIC E 1 E I E I E I FF s s s s AIS s s s s a a a a E E E S S l C-l C-l C l C-I I I A n n n n s s s s s s 0 L o o o o a a a 0 C N N N N l C l C l C 0 0 0 7 0 s s s s s 9 s s u u u u u 0 S u u B B B B B 0 y U B B 0 n V V V V V 0 an po B V V k k k k k 0 k k 6 6 6l 61 3 mi ot a t 6l 5 CS 9. 61 A 9. 61 B 1 A 1 B 1 A 1 B 1 C 1 0 41 4I 4l 41 41 0 r e r e t c ww e oo P P j o r s n P ioto S inn i & l l E i C l I D Illj l}'
lilin:is Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 3: PHSC TSC PROTECTION CONDITION PHSC INPUT ID PHSC PROTECTIVE ACTION TSC phase current unbalance TSC_10A Trip: 52-1,52-2; TSC 10B k TSC_10C Turn-off: TSC-THYRISTOR & TCR-THYRISTOR TEC phase overcurrent TSC_10A Trip: 52-1,52-2; TSC_10B ; TSC_10C Turn-off: TSC-7 'IYRISTOR & TCR-THYRISTOR TSC thyristor valve TSC_11 AB Trip: 52-1,52-2; overcurrent TSC_llBC , 4 TSC_11CA Turn-off: TSC-THYRISTOR & ) TCR-THYRISTOR j Failed TSC thyristor valve TSC_12AC,13AC Alarm on one failure per phase. (ioss of gate, short, open) TSC_12BC,13BC On more than one failure per phase, TSC_12CA,13CA Trip: 52-1, 52-2; ! Turn-off: TSC-THYRISTOR & TCR-THYRISTOR ! Shoned or open capacitor TSC_12AC,13 AC Trip: 52-1,52-2; l TSC_12BC,13BC , TSC_12CA,13CA Turn-off: TSC-THYRISTOR & l TCR-THYRISTOR l l f DE&S Project 00153.00.0009.07.00000 Page 34
lilin:is Power Company SVC Design Repon Cthton Power station Revision 0 TABLE 4: PHSC TCR PROTECTION CONDITION PHSC INPUT ID PROTECTIVE ACTION fCR phase current TCR_10A Trip: 52-1,52-2; unbalance TCR_10B TCR_10C Turn-off: TSC-THYRISTOR & TCR-THYRISTOR TCR phase overcurrent TCR_10A Trip: 52-1,52-2;
' CR_10B TCR_10C Turn-off: TSC-THYRISTOR &
TCR-THYRISTOR TCR thyristor TCR_11 AB Trip: 52-1,52-2; overcurrent TCR_IIBC TCR_11CA Turn-off: TSC-THYRISTOR &
~~
TCR-THYRISTOR failed TCR thyristor TCR_lIAB Alarm on one failure per phase. (loss of gate, shon, TCR_11BC On more than one failure per phase, open) TCR_11CA Trip: 52-1,52-2; Turn-off: TSC-THYRISTOR & TCR-THYRISTOR 4 DE&S Project 00153.00.0009.07.00000 Page 35
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lilinois Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 10: CPS VOLTAGES, RAT SOURCE, NO MODIFICATIONS,2007 CONDITION 345 kV VOLTAGE 4.16 kV BUS REQUIRED 4.16 BUS VOLTAGE VOLTAGE CPS Operating 103 % 103 % 294 % Unit Trip & LOCA 95 % 95 % 294 % Non 1E Loads Transfer 95 % 87 % 294 % 1E Loads Start 95 % 69 % 275% (starting) Steady State (Post LOCA) 95 % 83 % 294 % i Switchyard Overvoltage 105 % See section 3.3 See section 3.3 TABLE 11: CPS VOLTAGES, ERAT SOURCE, NO MODIFICATIONS,2001 CONDITION 138 kV VOLTAGE 4.16 kV BUS REQUIRED 4.16 BUS VOLTAGE VOLTAGE CPS Operating 100 % 100 % 294 % Unit Trip & LOCA 90 % 90 % 294 % 1E Loads Stan 90 % 66 % 275% (starting) Steady State (Post LOCA) 90 % 87 % 294 % Switchyard Overvoltage 105 % See section 3.3 See section 3.3 DEAS Project 00153.00.0009.07.00000 Page 41
lilinois Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 12: CPS VOLTAGES, RAT SOURCE Wml SVC,2007 CONDITION 345 kV VOLTAGE 4.16 kV BUS REQUIRED 4.16 BUS VOLTAGE VOLTAGE CPS Operating 103 % 100 % 294 % Unit Trip & LOCA 95 % 100 % 294 % Non 1E Loads Transfer 95 % 100 % 294 % 1E Loads Start 95 % 79 % 275% (starting) Steady State (Post LOCA) 95 % 99 % 294 % Switchyard Overvoltage 105 % See section 3.3 See section 3.3 TABLE 13: CPS VOLTAGES, ERAT SOURCE, SVC 2001 CONDITION 138 kV VOLTAGE 4.16 kV BUS REQUIRED 4.16 BUS VOLTAGE VOLTAGE CPS Operating 100 % 100 % 94 % Unit Trip & LOCA 90 % 100 % 94 % , l 1E Loads Start 90 % 85 % 75% (starting) Steady State (Post 90 % 99 % 94 % LOCA) l l DE&S Project 00153.00.0009.07.00000 Page 42 l
lilin:is Pow r Company SVC Design Report Clinton Power Station Revision 0 TABLE 14: SVC DESIGN REQUIREMENTS PARAMETER RATING Rated Voltage 4,160 volts Maximum Continuos Voltage 4,410 volts Temporary Overvoltage 4,530 volts Minimum Continuous Voltage 3,430 volts Nominal Frequency 60 Hz 1 Maximum Frequency Deviation +/- 0.2 Hz Max. short-circuit Power,3-Phase 225 Mva Rated Capacitive Reactive Power +28.5 Mvar ' Rated Inductive Reactive Power -14 Mvar i Voltage Reference Range +/- 5 % 3,952 - 4,368 volts Slope Setting Range 0% - 5% l l i DE&S Project 00153.00.0009.07.00000 Page 43
( Illinois Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 15: TCR REACTOR RATING PARAMETER RATING
- Rated voltage 4,160 volts Maximum continuous voltage 4,534 volts
{ Rated current 1,723 amperes Maxirnum continuous current 1,875 amperes Short circuit ratings 37,000 amperes for 3 seconds i l 10,500 amperes (mechanical l rating) , { Harmonic rating 252 amperes at'180 hertz l 92 amperes at 300 hertz 47 amperes at 420 hertz BIL 75 kV across reactor 95 kV across base insulator Nominal frequency 60 Hz Size 6.4 mH l l Max. short-circuit power,3-phase 225 Mva ! Temperature rise 80 C l Rated inductive reactive power -14 Mvar Type of core Air core Cooling Air cooled (natural) Reactors per phase 1 Standards IEEE C57.161990 Dimensions Four feet high and seven feet in ! diameter l Weight 5,300 pounds l - DE&S Project 00153.00 0009.07.00000 Page 44 l
lilinois Power Company SVC Design Repon Clinton Power Station Revision 0 TABLE 16: MAIN DISCONNECT SWITCH RATINGS PARAMETER RATING Rated Current 3000 A Rated Voltage 15 kV Phases I 3 1 l I TABLE 17: TCR DISCONNECT SWITCH PARAMETER ' RATING Rated Current 3000 A Rated Voltage 15 kV Phases 3 l l i TABLE 18: TSC DISCONNECT SWITCII ! PARAMETER RATING Rated Current 3000 A Rated Voltage 15 kV Phases 3 l t
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lilinois Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 19: TSC CAPACITORS PARAMETER RATING (Unit) RATING (Bank) Rated voltage: 2500 V 5000V BIL 75 kV 75 kV Rated capacitive reactive power 400.6 9614 Capacitors per phase 8 3 , l 1 i i
}
i l DE&S Project 00153.00.0009.07.00000 Page 46
lilin:is Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 20: TSC INDUCTOR PARAMETER RATING Rated voltage 4,160 volts Rated current 1767 A Rated Inductance 0.34 mH Short circuit ratings 15 kA Thermal (3 sec) 40 kA Mechanical Peak BIL 75 kV across coil 95 kV across base insulators Nominal frequency 60 Hz Temperature rise 80' C Rated inductive reactive power 400 kVA Type of core Dry type Air core Cooling Natural Air Standards IEEE C57.161996 Weight (approxim. ate) 408 Kg (900 lb.) i DE&S Project 00153.00.0009.07.00000 Page 47
lilinois Pow:r Company SVC Design Report Clinton Power Station Revision 0 TABLE 21: FC DISCONNECT SWITCH PARAMETER RATING - Rated Current 1200 A Rated Voltage 15 kV Phases 3 i l r l l l DE&S Project 00153.00.0009.07.00000 Page 48
lilin is Power Company SVC Design Report Clinton Power Station Revision 0 TABLE 22: FC CAPACITOR PARAMETER RATING (Unit) RATING (Bank) Rated voltage: 3,000 V 5,196V BIL 75 kV 75 kV Rated capacitive reactive power 473 kVAr 12 x 473 kVAr Capacitors per phase 1 3 s 1 1
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i l l l 1 DE&S Project 00153.00.0009.07.00000 Page 49
Illinois Power Company SVC Design Report Clinton Power Station Revision 0 l l TABLE 23: FC INDUCTOR & RESISTOR PARAMETER RATING Rated voltage 4,160 volts Rated current 552 A Short circuit ratings 10.6 kA Thermal (3 sec) 30 kA Mechanical Peak BIL 75 kV across coil i 95 kV across interphase insulators 95 kV across base insulators Nominal frequency 60 Hz Temperature rise 80 C Rated inductive reactive power 57.4 kVA Type of core Dry-type air core 1 1 Cooling Natural Air Standards IEEE C57.161996 Weight (approximate) 646 Kg (1425 lb.) l [ DE&S Project 00153.00.0009.07.00000 Page 50
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