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Relay Co Ordination

The document summarizes relay coordination for an 11kV bus fault at a substation. It provides fault level and current details, as well as circuit breaker ratings, trip curves, fault currents, and tripping times for the 11kV feeder, SEZ feeder at an MRS division, 11kV LV feeder, and 110kV HV and incomer to coordinate isolation of the fault within set time thresholds. Coordination plots for the fault show the tripping characteristics of each protective device.

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Gokul Murugesan
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295 views6 pages

Relay Co Ordination

The document summarizes relay coordination for an 11kV bus fault at a substation. It provides fault level and current details, as well as circuit breaker ratings, trip curves, fault currents, and tripping times for the 11kV feeder, SEZ feeder at an MRS division, 11kV LV feeder, and 110kV HV and incomer to coordinate isolation of the fault within set time thresholds. Coordination plots for the fault show the tripping characteristics of each protective device.

Uploaded by

Gokul Murugesan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as XLSX, PDF, TXT or read online on Scribd
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110KV

RELAY COORDINATION
SEZ 11KV BUS FAULT
FAULT LEVEL 111.5856525 MVA
FAULT CURRENT 5856.899667 A

11 KV FEEDER (SEZ)
CTR 125 6
3 O/L 90%
TL 0.05
CURVE 3
TIME 0.15
FAULT CURRENT ( Fault Current/CT RATIO) 46.8551973 A
TRIPPING TIME 0.087386348 SECS
11 KV SEZ FEEDER
CTR 1000 4
3 O/L 40%
1 TL 0.14
CURVE 3
TIME 0.42
FAULT CURRENT ( Fault Current/CT RATIO) 5.85689967 A
TRIPPING TIME 0.360327035 SECS
11 KV SEZ FEEDER AT MRS DIVISION
CTR 1000 4
3 O/L 40%
TL 0.22
CURVE 3
TIME 0.66
FAULT CURRENT ( Fault Current/CT RATIO) 5.85689967 A
TRIPPING TIME 0.566228198 SECS
11 KV LV
CTR 1500
3 O/L 21%
TL 0.37
2 CURVE 3
TIME 1.11
FAULT CURRENT ( Fault Current/CT RATIO) 3.90459978 A
TRIPPING TIME 0.874458327 SECS
2

110KV HV & INCOMER


CTR 150 6
3 O/L 100%
TL 0.27
CURVE 3
TIME 0.81
11 KV THROUGH FAULT CURRENT 585.6899667 A
3 FAULT CURRENT 3.90459978 A
TRIPPING TIME 1.369222688 SECS
FAULT AT 11KV
INST
11 KV FEEDER ( SEZ TR
CURRENT
Incomers)
20% 1171.3799335 0.1474135906
40% 2342.7598669999 0.11375915
52.0613 60% 2928.4498337499 0.1059707251
80% 4685.5197339999 0.0926151605

100% 5856.8996674999 0.087386348


INST
2.5

2
14.6422

SION 1.5
INST

14.6422 0.5

0
0 1000 2000 3000

18.5933
INST

O/L
BREAKER CT RATIO
3.9046 %
11KV FEEDER 125 90%
11KV SEZ 1000 40%
11KV SEZ AT MRS
1000 40%
DIVISION
11KV LV 1500 21%

110KV HV &
150 100%
INCOMER
FAULT AT 11KV BUS

11KV SEZ # AT 110KV HV &


11KV SEZ 11KV LV
MRS DIVISION INCOMER
0.9000556967 1.4143732377 1.9460463856
0.5471116654 0.8597469028 1.2737870817
0.485786243 0.7633783819 1.1463067029
0.3930016585 0.6175740348 0.9467377153 1.6374668183

0.360327035 0.5662281978 0.8744583268 1.3692226878

3000 4000 5000 6000 7000


O/L
TL TIME INST
0.05 0.15 6
0.14 0.42 4

0.22 0.66 4

0.37 1.11 Disable

0.27 0.81 6

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