Sample Coordination Study

Station: Omitted Project Number: Omitted

Calculation Number: Omitted of 3

Title: Omitted

Contents 1.0 Background ..................................................................................................................................... 2

2.0 Design Input .................................................................................................................................... 2

3.0 Analysis ............................................................................................................................................ 2

4.0 Results/Conclusions ........................................................................................................................ 3

5.0 References ........................................................................................................................................ 3

6.0 List of Attachments ......................................................................................................................... 3



Title: Omitted

1.0 Background This proposed design installs two three phase pad mounted reclosers to provide secondary protection for the 6MVA 13.8/13.2kV site power transformers 0X03 and 0X04 and to mitigate the impact on the balance of plant equipment due to a fault in the plant site power system. A recent ground fault on the secondary side of one of the transformers has demonstrated that the transformers are not adequately protected (i.e. the transformer damage occurred). The reclosers will be located between the secondary side of transformers 0X03 and 0X04 and the first downstream pad mounted switches 0DISC289-SW17 and 0DISC289-SW16. As most of the distribution system cabling is underground, the new reclosers will be set to interrupt and will not reclose (i.e. one shot protection scheme). Transformers 0X03 and 0X04 are powered by 13.8kV buses 11 (breaker 252-1106) and 21 (252-2106) respectively. These transformers then go on to feed disconnect switches 0DISC289-17 and 0DISC289-16 respectively. The purpose of this study is to develop the new recloser controller phase and ground protection settings to ensure that the transformers are adequately protected and that coordination exists between the reclosers, the upstream feeder breakers, and downstream fuses. 2.0 Design Input The maximum interrupting rating of the reclosers is 12kA (Reference OMITTED). This is greater than the maximum short circuit on the system of approximately 4.85kA. The maximum short circuit current was calculated based on the transformer impedance of 6.5% (Reference OMITTED), cable A0H206P impedance (Reference OMITTED), and a conservative assumption that a 6MVA load is connected with 50% of the load being motor load drawing 650% locked rotor current. The ETAP model generated for coordination purposes was used to calculate this value. It should be noted that negative sequence impedance data is not available for transformers 0X03 and 0X04 and therefore the fault current for ground faults is conservatively assumed to be the same as for phase faults. Ground and phase protection is provided for the primary side of transformers 0X03 and 0X04 from SEL-551 relays which control breakers 252-1106 and 252-2106. Downstream of disconnect switches 0DISC289-17 and 0DISC289-16 are fused disconnect switches 0DISC289-SW01 and 0DISC289-SW14 respectively which each contain a Combined Technologies Type 155F125-Q1B fuse (Reference OMITTED). It should be noted that based on vendor input, the TCC curve for this fuse is the same as the TCC curve for a Cooper X-Limiter type fuse. The TCC curves for the fuses are provided in (Reference OMITTED). The TCC curves for the SEL-551 relay are shown in (Reference OMITTED). The ETAP library is utilized to model these devices. The TCC curves for the Form 6 recloser controls are shown in (Reference OMITTED). Note that the ETAP library does not contain a Form 6 controller but it does contain a Form 4C controller. Review of the Cooper vendor literature indicates that the TCC curves of the Form 4C are the same as the Form 6 controller. Therefore the Form 4C controller will be utilized in the ETAP model. The existing settings for the SEL-551 relay are documented in (Reference OMITTED). Damage curves were not available for transformers 0X03 and 0X04 and therefore, a typical damage curve was selected using ANSI C57.109 and based on the transformer ratings from (Reference OMITTED). It was assumed that the total connected transformer load downstream of transformers 0X03 and 0X04 is 6MVA. Typical inrush current for liquid filled 13kV transformers is 12 times the full load current at 6 cycles. This value is reflected in Attachment 1. The damage curve for the 500MCM cables is taken from the NEC. 3.0 Analysis The recloser phase and ground protection settings were selected such that the transformers are protected and they coordinate with the downstream fuses and upstream SEL-551 relay. For the phase protection, curve 202 was selected and a pickup of 300A was selected. Also a minimum response time TCC modifier of 15cycle and a vertical multiplier of 0.37 were selected. The resultant curve shape allows for coordination between the fuse and the Form 6



Title: Omitted recloser controller. For ground protection, curve 202 was also selected and a pickup of 250A was selected. No TCC modifiers were used. The resultant curve shape allows for coordination between the fuse and the Form 6 recloser controller. It should be noted that although actual ground fault current is not known, transformers 0X03 and 0X04 are still adequately protected. Ground faults lower than 250A will not damage the transformers as this is less than their full load current rating. The Form 6 settings for each recloser are documented in Attachment 2. 4.0 Results/Conclusions A coordination plot was created using the above methodology as well as the input discussed in Section 2.0 and is attached to this document as Attachment 1. As the transformers 0X03 and 0X04 are all delta-wye connected, the ground protection on the primary side of 0X03 and 0X04 will not see ground faults on the secondary side. As such, coordination for the ground TCC curves between the recloser and SEL-551 relay is not required. The phase protection provided by the SEL-551 relay, however, will need to coordinate with the ground protection provided by the recloser controller. For ground faults on the secondary side of transformers 0X03 and 0X04, the phase protection of the SEL-551 relays will see 58% (i.e. 1/√3) of the fault current times the transformer turns ratio (i.e. 58% * 13.2kV/13.8kV = 55.5%). This shift was not plotted in Attachment 1. A visual inspection of Attachment 1 was performed and it was determined that the recloser ground protection coordinates with the SEL-551 phase protection. Since this is the case, as can be seen in Attachment 1, proper coordination exists up to the calculated maximum short circuit value and the transformers and cables will be protected using the selected recloser settings. This allows for improved protection of transformers 0X03 and 0X04 as well as mitigation of impacts on the auxiliary power system due to system faults. 5.0 References OMITTED 6.0 List of Attachments*

6.1 Attachment 1: Coordination Plot XXXX 6.2 Attachment 2: Cooper Form 6 Controller Settings Sheet

*Other Attachments OMITTED

0DISC289-SW16/SW17 FuseCooperX-LimiterCoordinating 15.5 kV125A

SEL-551 - POC1Schweitzer551CT Ratio 1200:5U3 - U.S. Very InversePickup = 1.5 (0.5 - 16 Sec - 5A)Time Dial = 53x = 2.91 s, 5x = 1.29 s, 8x = 0.789 sInst = 24 (0.5 - 80 Sec - 5A)

A0H206P1 - 3/C 500 kcmilAluminum RubberTc = 90C

0X03/0X046 MVA (Secondary) 6.5 %ZDelta-Wye Solid GrdANSI Curve Shift = 0.58

Inrush

FLA

Recloser - PTCC1CooperForm 4C202Pickup = 300 (100 - 2400 Primary)Interrupting Time = 34 msMinimum Response Time = 15 CyclesVertical Multiplier = 0.373x = 3.72 s, 5x = 1.21 s, 8x = 0.495 sClearing

Recloser - 3P4.851kA @ 13.2kV(Sym)

SEL-551 - GOC1Schweitzer551CT Ratio 50:5U2 - U.S. InversePickup = 1.4 (0.5 - 16 Sec - 5A)Time Dial = 13x = 0.924 s, 5x = 0.428 s, 8x = 0.274 s

Recloser - GTCC1CooperForm 4C202Pickup = 250 (2 - 400 Primary)Interrupting Time = 34 ms3x = 10 s, 5x = 3.22 s, 8x = 1.28 sClearing

10K.5 1 10 100 1K3 5 30 50 300 500 3K 5K

Amps X 10 Site Power (Nom. kV=13.2, Plot Ref. kV=13.2)

10K.5 1 10 100 1K3 5 30 50 300 500 3K 5K

Amps X 10 Site Power (Nom. kV=13.2, Plot Ref. kV=13.2)

1K

.01

.1

1

10

100

.03

.05

.3

.5

3

5

30

50

300

500

Sec

onds

1K

.01

.1

1

10

100

.03

.05

.3

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3

5

30

50

300

500

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ETAP Star 7.1.0N

Site Power Coordination

Project: Site Self Power ReclosersLocation: CCNPPContract:Engineer: Sargent & Lundy, LLCFilename: D:\0n7518\Constellation\Calvert Cliffs\11562-080\11562-080 Coordination\115

Date: 09-17-2012 SN: SARGENTLDYRev: BaseFault: Ground

o

o

Bus 11/21

Site Power

79 Recloser

0DISC289-SW16/SW17 Fuse

OCR SEL-551

252-1106/2106

0X03/0X046 MVA

A0H206P1-3/C 500

Site Power Loads6 MVA

Site Power

252-1106/2106

Site Power Loads6 MVA

A0H206P1-3/C 500

SEL-5510X03/0X046 MVA

Recloser

0DISC289-SW16/SW17 Fuse

Bus 11/21

ECP-12-000556 Form 7, Attachment 2 Page 1 of 1

Note: SEL-551 phase protection will only see 58% times the transformer turns ratio of a ground fault on the secondary side of the transformer due toits delta-wye connection. Therefore, although not shown on this plot, coordination exists between the SEL-551-P and Recloser-G curves.

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Device Identity

0BKR252-0H1106UserDeviceName

Alternate 3Alternate 2Alternate 1NormalOvercurrent Settings

Phase:UnblockedUnblockedUnblockedUnblockedPhsTripBlkUnblockedUnblockedUnblockedUnblockedFastTripBlock300300300300TCCPMinTrip

IEC EI (202)IEC EI (202)IEC EI (202)IEC EI (202)TCC1PCurve Enable Enable Enable EnableTCC1PMultEnable0.370.370.370.37TCC1PMultDisableDisableDisableDisableTCC1PAddEnable0000TCC1PAdd Enable Enable Enable EnableTCC1PMRTAEnable0.250.250.250.25TCC1PMRTADisableDisableDisableDisableTCC1PHCTEnable32323232TCC1PHCT Mul0.0160.0160.0160.016TCC1PHCTDly

IEC EI (202)IEC EI (202)IEC EI (202)IEC EI (202)TCC2PCurve Enable Enable Enable EnableTCC2PMultEnable0.370.370.370.37TCC2PMultDisableDisableDisableDisableTCC2PAddEnable0000TCC2PAdd Enable Enable Enable EnableTCC2PMRTAEnable0.250.250.250.25TCC2PMRTADisableDisableDisableDisableTCC2PHCTEnable32323232TCC2PHCT Mul0.0160.0160.0160.016TCC2PHCTDly

Doc ID: 0BKR252-0H1106/RECL, Rev. 0 Doc Type: PRSS ECP: ECP-12-000556

Attachment 2 Page 1 of 11

/RECL

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Ground:UnblockedUnblockedUnblockedUnblockedGndTripBlkUnblockedUnblockedUnblockedUnblockedFastTripBlock150150150150TCCGMinTrip

120120120120TCC1GCurveDisableDisableDisableDisableTCC1GMultEnable1111TCC1GMultDisableDisableDisableDisableTCC1GAddEnable0000TCC1GAddDisableDisableDisableDisableTCC1GMRTAEnable0.0130.0130.0130.013TCC1GMRTADisableDisableDisableDisableTCC1GHCTEnable32323232TCC1GHCT Mul0.0160.0160.0160.016TCC1GHCTDly

120120120120TCC2GCurveDisableDisableDisableDisableTCC2GMultEnable1111TCC2GMultDisableDisableDisableDisableTCC2GAddEnable0000TCC2GAddDisableDisableDisableDisableTCC2GMRTAEnable0.0130.0130.0130.013TCC2GMRTADisableDisableDisableDisableTCC2GHCTEnable32323232TCC2GHCT Mul0.0160.0160.0160.016TCC2GHCTDly



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250 250 250 250

IEC EI (202) IEC EI (202) IEC EI (202) IEC EI (202)

IEC EI (202) IEC EI (202)IEC EI (202) IEC EI (202)

Negative Sequence:BlockedBlockedBlockedBlockedNegSeqTripBlkUnblockedUnblockedUnblockedUnblockedFastTripBlock100100100100TCCQMinTrip

104104104104TCC1QCurveDisableDisableDisableDisableTCC1QMultEnable1111TCC1QMultDisableDisableDisableDisableTCC1QAddEnable0000TCC1QAddDisableDisableDisableDisableTCC1QMRTAEnable0.0130.0130.0130.013TCC1QMRTADisableDisableDisableDisableTCC1QHCTEnable32323232TCC1QHCT Mul0.0160.0160.0160.016TCC1QHCTDly

117117117117TCC2QCurveDisableDisableDisableDisableTCC2QMultEnable1111TCC2QMultDisableDisableDisableDisableTCC2QAddEnable0000TCC2QAddDisableDisableDisableDisableTCC2QMRTAEnable0.0130.0130.0130.013TCC2QMRTADisableDisableDisableDisableTCC2QHCTEnable32323232TCC2QHCT Mul0.0160.0160.0160.016TCC2QHCTDly



User Curves:not loadedUser 1:xTCC40User 1:xMmax0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0User 1:xT1User 1:xTmin

not loadedUser 2:xTCC40User 2:xMmax0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0User 2:xT1User 2:xTmin






Alternate 3Alternate 2Alternate 1NormalOperations Sequence

1111Operations To LO

Phase/Neg Sequence:TCC2TCC2TCC2TCC2PQOper#1TCC2TCC2TCC2TCC2PQOper#2TCC2TCC2TCC2TCC2PQOper#3TCC2TCC2TCC2TCC2PQOper#4

Ground:TCC2TCC2TCC2TCC2GndOper#1TCC2TCC2TCC2TCC2GndOper#2TCC2TCC2TCC2TCC2GndOper#3TCC2TCC2TCC2TCC2GndOper#4

Alternate 3Alternate 2Alternate 1NormalReclose Intervals

Phase/Neg Sequence:2222PQOpenInt#12222PQOpenInt#25555PQOpenInt#3

Ground:2222GndOpenInt#12222GndOpenInt#25555GndOpenInt#3

30303030ResetTime



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Alternate 3Alternate 2Alternate 1NormalCold Load Pickup

YesYesYesYesCLPUBlock

Phase:300300300300CLPUPMinTripIEC EI (202)IEC EI (202)IEC EI (202)IEC EI (202)CLPUPCurve Enable Enable Enable EnableCLPUPMultEnable0.370.370.370.37CLPUPMultDisableDisableDisableDisableCLPUPAddEnable0000CLPUPAdd Enable Enable Enable EnableCLPUPMRTAEnable0.250.250.250.25CLPUPMRTADisableDisableDisableDisableCLPUPHCTEnable32323232CLPUPHCT Mul0.0160.0160.0160.016CLPUPHCTDly

Ground:150150150150CLPUGMinTrip120120120120CLPUGCurveDisableDisableDisableDisableCLPUGMultEnable1111CLPUGMultDisableDisableDisableDisableCLPUGAddEnable0000CLPUGAddDisableDisableDisableDisableCLPUGMRTAEnable0.0130.0130.0130.013CLPUGMRTADisableDisableDisableDisableCLPUGHCTEnable32323232CLPUGHCT Mul0.0160.0160.0160.016CLPUGHCTDly

Negative Sequence:100100100100CLPUQMinTrip101101101101CLPUQCurveDisableDisableDisableDisableCLPUQMultEnable1111CLPUQMultDisableDisableDisableDisableCLPUQAddEnable0000CLPUQAddDisableDisableDisableDisableCLPUQMRTAEnable0.0130.0130.0130.013CLPUQMRTADisableDisableDisableDisableCLPUQHCTEnable32323232CLPUQHCT Mul0.0160.0160.0160.016CLPUQHCTDly



Alternate 3Alternate 2Alternate 1NormalFrequency

Underfrequency:OffOffOffOffUFreqEnable56565656UFreq1PU100100100100UFreq1Time56565656UFreq2PU100100100100UFreq2Time

Overfrequency:OffOffOffOffOFreqEnable64646464OFreq1PU100100100100OFreq1Time64646464OFreq2PU100100100100OFreq2Time

U/OF Tripping Supervision:3.63.63.63.6Freq:MinVolt

UF Loadshed Restore:OffOffOffOffFreqRestoreEnable60.0560.0560.0560.05Freq:81OR:PU300300300300Freq:62Schedule600600600600Freq:62Abort0.30.30.30.3Freq:62TransientOffOffOffOffVoltFreqRestSupEn



Alternate 3Alternate 2Alternate 1NormalReclsTime and Control

Enable Enable Enable Enable79ResetTarEnable222279ResetTar Enable Enable Enable Enable79SeqCoorEnable222279SeqCoorOps

Alternate 3Alternate 2Alternate 1NormalReclose Retry

DisableDisableDisableDisableRecloseRetryEnable1111RecloseRetryAttempts60606060RecloseRetryInterval

Alternate 3Alternate 2Alternate 1NormalVoltage

Undervoltage:OffOffOffOffUVolt1PEnableOffOffOffOffUVolt3PEnableOffOffOffOffUVolt1P/3Pinhibit11.5211.5211.5211.52UVolt1PPU100100100100UVolt1PTime11.5211.5211.5211.52UVolt3PPU100100100100UVolt3PTime

Overvoltage:OffOffOffOffOVoltEnable16.216.216.216.2OVolt1PPU100100100100OVolt1PTime16.216.216.216.2OVolt3PPU100100100100OVolt3PTime

U/OV Loadshed Restore:OffOffOffOffVoltRestoreEnableAny Single PhaseAny Single PhaseAny Single PhaseAny Single PhaseVoltRestoreMode15.1215.1215.1215.12VoltRestHiL13.6813.6813.6813.68VoltRestLoL300300300300Freq:62Schedule600600600600Freq:62Abort0.30.30.30.3Freq:62TransientOffOffOffOffVoltFreqRestSupEn

Alternate 3Alternate 2Alternate 1NormalSensitive Earth Fault



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Enable Enable Enable EnableSEFBlock40404040SEFMinTrip120120120120SEFTime2222SEFReclInt4444SEFNumOps



Alternate 3Alternate 2Alternate 1NormalDirectional Control

60606060DirMTANonDirectionalNonDirectionalNonDirectionalNonDirectionalDirPhsNonDirectionalNonDirectionalNonDirectionalNonDirectionalDirGndNonDirectionalNonDirectionalNonDirectionalNonDirectionalDirNegSeq

Alternate 3Alternate 2Alternate 1NormalLow Set

Phase:DisableDisableDisableDisableLSPEnable3200320032003200LSPPU100100100100LSPTimeDelay

Ground:DisableDisableDisableDisableLSGEnable1600160016001600LSGPU100100100100LSGTimeDelay

Negative Sequence:DisableDisableDisableDisableLSQEnable3200320032003200LSQPU100100100100LSQTimeDelay

Alternate 3Alternate 2Alternate 1NormalSync Check

DisableDisableDisableDisable25DV:EnableDisableDisableDisableDisable25DV:DLDBDisableDisableDisableDisable25DV:DLHBDisableDisableDisableDisable25DV:HLDBDisableDisableDisableDisable25DV:HLHB1584015840158401584025DV:27264026402640264025DV:27DEAD1224012240122401224025DV:591152011520115201152025DV:59LIVE4040404025DV10101010StaticAngleDelay0.10.10.10.1MechanismOpDelay





0BKR252-0H1106/RECL

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Sample Coordination Study

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Transcript of Sample Coordination Study