CONSORTIUM
Subject. - Relay Setting Calculation – Doc. No. ISP/AREVA-EMC-A/IX/22/16/29/DE/1007J Project LBDS Package – 22 - New Stream 2.5 MT Expansions at IISCO Steel Plant Page- 1
RELAY SETTING CALCULATION FOR OVERCURRENT AND VOLTAGE OPERATED
RELAYS OF LBDS-9
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
1.0
a 33
b 800/1 A
d 800 A
e 11650 A
g 34000 KVA
h 594.86 A
f. Relay used MICOM P127
g. Setting ranges : steps
I> 0.1-25In @ 0.01 In
I>> 0.5-40In @ 0.01 In
I>>> 0.5-40In @ 0.01 In
TMS = 0.025-1.5 @ 0.025
Definite time setting = 0-150 sec @ 0.01 sec
2.0 SETTING VALUES
2.1 Proposed Is (IDMT) setting for O/C (51)
a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard Inverse
b. Plug setting (PS) proposed = 1
c. Is = Current in amps corresponding to PS = PS*In 800
d. Proposed TMS setting = 0.550
2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)
a. Minimum Isc setting proposed in multiples M of In 1.75
b. Isc Current in amps corresponding to Isc setting = M*In 1400
c. Proposed DT time in sec = 1.55
2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)
a. Minimum Isc setting proposed in multiples (M) of In 4.5
b. Isc Current in amps corresponding to Isc setting = M*In 3600
c. Proposed DT time in sec = 0.65
2.4
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
16000 20 914.52 0.65 DT zone
3600 4.5 205.77 0.65 I>>>
3600 4.5 205.77 1.55
3600 4.5 205.77 1.55 DT zone
BASIC DATA
System voltage in kV
Selected CT Ratio =
In = Rated current in amps corresponding to CT ratio of 800/1A =
Minimum symmetrical 3-Ph S/C current in amps at 33 KV bus =
Total load on 33kV bus =
Load current =
Time of Operation for Different Fault Current
A. Setting of Relays For 33 KV I/C
Consultant : SATCON Page 2 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
1400 1.75 80.02 1.55 I>>
1400 1.75 80.02 6.84
11650 14.5625 665.89 1.40
8000 10 457.26 1.63
4800 6 274.36 2.11
3200 4 182.90 2.74
1600 2 91.45 5.52
1520 1.9 86.88 5.96 IDMT zone
1440 1.8 82.31 6.51 I>
1400 1.75 80.02 6.84
1360 1.7 77.73 7.22
1280 1.6 73.16 8.15
1200 1.5 68.59 9.46
1120 1.4 64.02 11.40
1040 1.3 59.44 14.64
960 1.2 54.87 21.08
880 1.1 50.30 40.36
2.5
a. 44
b. 2.5
c. 88
d. 2
2.6
a. 121
b. 1
1 RELAY TYPE MICOM P922
1.1 110
1.2
a. 44
b. 2.5
c. 88
d. 2
1.3
a. 121
b. 1
B. Settings of Relays for 33 KV Bus PT
Rated PT secondary voltage (Vn)
Undervoltage protection (27)
Undervoltage protection (27)
V< in volts = 0.4*Vn (I/C brkr trip)
DT setting in sec =
V<< in volts = 0.8*Vn (Annunciation, I/C brkr closing circuit interlock)
DT setting in sec =
V>> in volts = 1.1*Vn (For annunciation)
DT setting in sec =
V<< in volts = 0.8*Vn (I/C and B/C brkr closing circuit interlock)
DT setting in sec =
Overvoltage protection (59)
V> in volts = 1.1*Vn (For annunciation)
DT setting in sec =
V< in volts = 0.4*Vn (I/C and B/C brkr closing circuit interlock)
DT setting in sec =
Overvoltage protection (59)
Consultant : SATCON Page 3 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
1.4
a. 6.6
b. 0.05
c. 20
d. 0.1
1.0
a. 33
b. 400/ 1A
c. 400 A
d. 11650 A
e. MICOM P132
f.
0.1-4In
0.1-40In
0.1-40In
0.1-40In
0.05-10
0-100 sec
2.0 SETTING VALUES
2.1 Proposed IDMT setting for O/C (51),
a. Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 1.5
c. I>1 = Current in amps corresponding to PS = PS*In 600
d. Proposed TMS setting = 0.475
2.2 Proposed I> (DT) setting for O/C (50-1)
a. Minimum Isc setting proposed in multiples M of In 3
b. Isc Current in amps corresponding to Isc setting = M*In 1200
c. Proposed DT time in sec = 1.25
2.3 Proposed I>> (DT) setting for O/C (50-2)
a. Minimum Isc setting proposed in multiples M of In 8.25
b. Isc Current in amps corresponding to Isc setting = M*In 3300
c. Proposed DT time in sec = 0.35
2.4 Proposed I>>> (DT) setting for O/C (50-3)
a. Minimum Isc setting proposed in multiples (M) of In
DT setting in sec =
System voltage in kV
BASIC DATA
Minimum symmetrical 3-Ph S/C current in amps at 11 KV bus =
Relay used
IDMT
I> DT
I>> DT
In = Rated current in amps corresponding to CT ratio of 1500/1A =
Setting ranges :
I>>> DT
TMS =
Definite time setting =
Not used
Selected CT Ratio =
C. Settings of Relays For 33 KV Bus Coupler
V0> in volts = 0.06*Vn (For Alarm)
DT setting in sec =
V0>> in volts = 0.2*Vn (for tripping of respective I/C)
Residual overvoltage/neutral displacement protection (60)
Consultant : SATCON Page 4 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
b. Isc Current in amps corresponding to Isc setting = M*In
c. Proposed DT time in sec =
2.5
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
8000 20 457.26 0.35 DT zone
3300 8.25 188.62 0.35 I>>
3300 8.25 188.62 1.25 DT zone
1200 3 68.59 1.25 I>
1200 3 68.59 4.76
11650 19.417 665.88 1.09
6000 10 342.95 1.41
3000 5 171.47 2.03
1800 3 102.88 2.99
1200 2 68.59 4.76
1140 1.9 65.16 5.15 IDMT zone
1080 1.8 61.73 5.62
1020 1.7 58.30 6.23
960 1.6 54.87 7.04
900 1.5 51.44 8.17
840 1.4 48.01 9.85
780 1.3 44.58 12.64
720 1.2 41.15 18.20
660 1.1 37.72 34.85
2.6
a. 15o
b. 5.5 5%
c. 0.1
d. 20 > 20%
e. 32 > 30%
1.0
a. 33 kV
b. 600/1 A
c. 600 A
d. 11650 A
e. 2256 A
f. 551 A
BASIC DATA
System voltage
25 Check Synchronisation
Time of Operation for Different Fault Current
Live Bus Voltage setting in volts
In = Rated current in amps corresponding to CT ratio of 250/1A =
Rated primary current in amps of 31.5 MVA Transformer =
Phase angle setting
Vdiff setting in volts
Minimum symmetrical 3-Ph S/C current in amps at 33 KV bus =
D. Settings of Relays For 33 KV Transformer Feeder
Slip frequency setting in Hz
Dead Bus Charging Voltage setting in volts
Selected CT Ratio =
Reflected current on 33 KV side due to fault at 6.6kV side of trafo and minimum fault level condition =
Consultant : SATCON Page 5 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
g. MICOM P122
h. steps
0.1-25In @ 0.01 In
0.5-40In @ 0.01 In
0.5-40In @ 0.01 In
0.025-1.5 @ 0.025
0-150 sec @ 0.01 sec
2.0 SETTING VALUES
2.1 Proposed Is (IDMT) setting for O/C (51), I>
a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 1
c. Is = Current in amps corresponding to PS = PS*In 600
d. Proposed TMS setting = 0.325
2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)
a. Minimum Isc setting proposed in multiples M of In 1.5
b. Isc Current in amps corresponding to Isc setting = M*In 900
c. Proposed DT time in sec = 0.95
2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)
a. Minimum Isc setting proposed in multiples (M) of In 5
b. Isc Current in amps corresponding to Isc setting = M*In 3000
c. Proposed DT time in sec = 0.05
2.4 Time of Operation for Different Fault Current
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
12000 20 685.89 0.05 DT Zone
3000 5 171.47 0.05 (I>>>)
3000 5 171.47 0.95
3000 5 171.47 0.95 DT Zone
900 1.5 51.44 0.95 (I>>)
900 1.5 51.44 5.59
11650 19.42 665.89 0.74
6000 10.00 342.95 0.97
4200 7.00 240.06 1.15
3000 5.00 171.47 1.39
2256 3.76 128.95 1.70
I>>
I>>>
TMS =
Definite time setting =
I>
Relay used
Setting ranges :
Consultant : SATCON Page 6 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
1200 2.00 68.59 3.26 IDMT zone
1140 1.9 65.16 3.52 I>
1080 1.8 61.73 3.85
1020 1.7 58.30 4.26
960 1.6 54.87 4.82
900 1.5 51.44 5.59
840 1.4 48.01 6.74
780 1.3 44.58 8.65
720 1.2 41.15 12.46
660 1.1 37.72 23.85
1.0
a. 6.6 kV
b. 3000/1 A
c. 3000 A
d. 11280 A
e. 2256 A
f. 2756 A
g. MICOM P632
h.
0.1-4 In
0.1-30 In
0.1-30 In
0.05 - 10
0-100 sec
2.0 SETTING VALUES
2.1 Proposed IDMT setting for O/C (51),
a. Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.9c. I>1 = Current in amps corresponding to PS = PS*In 2700
d. Proposed TMS setting = 0.275
2.2 Proposed I> (DT) setting for O/C (50-1)
a. Minimum Isc setting proposed in multiples M of In 1.5
b. Isc Current in amps corresponding to Isc setting = M*In 4500c. Proposed DT time in sec = 0.65
2.3 Proposed I>> (DT) setting for O/C (50-2)a. Minimum Isc setting proposed in multiples M of In
b. Isc Current in amps corresponding to Isc setting = M*In
Relay used
Not used
System voltage
Selected CT Ratio =
I>>> (DT-2)
TMS =
Rated primary current (at 6.6kV) in amps of 31.5 MVA Transformer =
Setting ranges for overcurrent relays :
I> (IDMT)
E. Settings of Relays for 6.6 KV I/C From 25/31.5 MVA Trafo
Reflected current on 33 KV side due to fault on 6.6kV side of trafo and minimum fault level condition =
In = Rated current in amps corresponding to CT ratio of 250/1A =
Definite time setting =
Minimum symmetrical 3-Ph S/C current in amps at 6.6 KV bus =
BASIC DATA
I>> (DT-1)
Consultant : SATCON Page 7 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
c. Proposed DT time in sec =
2.4
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
60000 20 685.89 0.65 DT zone
4500 1.5 51.44 0.65 I>>
4500 1.5 51.44 3.75
27000 10 308.65 0.82
24300 9 277.79 0.86
18900 7 216.06 0.97
10800 4 123.46 1.37
11280 4.1777 128.95 1.33
8100 3 92.60 1.73
5400 2 61.73 2.76
5130 1.9 58.64 2.98 IDMT zone
4860 1.8 55.56 3.26 I>
4590 1.7 52.47 3.61
4500 1.6666 51.44 3.75
4320 1.6 49.38 4.08
4050 1.5 46.30 4.73
3780 1.4 43.21 5.70
3510 1.3 40.12 7.32
3240 1.2 37.04 10.54
2970 1.1 33.95 20.18
2.5
a. 44
b. 2.5
c. 88
d. 2
2.6
a. 121
b. 1
2.7 Transformer Differential Protection (87T) Available range
a. 0.3 0.2-0.5
b. 0.8 0.4-1.5
c. 2756
d. 551 0.1-2.5 x I ref
e. 27556 5-30 x I ref
f. 55112 5-30 x I ref
Idiff>> in amps = 10 x I ref
V<< in volts = 0.8*Vn (Annunciation, I/C brkr closing circuit interlock)
DT setting in sec =
m1
m2
I ref = Trafo full load current in amps on 31.5 MVA base (FLC)
Idiff> in amps = 0.2 x I ref
Idiff>>> in amps = 20 x I ref
V> in volts = 1.1*Vn (For annunciation)
DT setting in sec =
Overvoltage protection (59)
V< in volts = 0.4*Vn (I/C brkr trip)
DT setting in sec =
Undervoltage protection (27)
Time of Operation for Different Fault Current
Consultant : SATCON Page 8 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
g. 11022 1.5-10 x I ref
h. 551 0.1-0.5 x I ref
1.0a. 6.6
b. 1500/ 1A
c. 1500 A
d. 11280 A
e. MICOM P132f.
0.1-4In
0.1-40In
0.1-40In
0.1-40In
0.05-10
0-100 sec
2.0 SETTING VALUES
2.1 Proposed IDMT setting for O/C (51),a. Curve used for IDMT setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverseb. Plug setting (PS) proposed = 1c. I>1 = Current in amps corresponding to PS = PS*In 1500d. Proposed TMS setting = 0.275
2.2 Proposed I> (DT) setting for O/C (50-1)a. Minimum Isc setting proposed in multiples M of In 1.5
b. Isc Current in amps corresponding to Isc setting = M*In 2250
c. Proposed DT time in sec = 1.3
2.3 Proposed I>> (DT) setting for O/C (50-2)a. Minimum Isc setting proposed in multiples M of In 3
b. Isc Current in amps corresponding to Isc setting = M*In 4500c. Proposed DT time in sec = 0.35
2.4 Proposed I>>> (DT) setting for O/C (50-3)a. Minimum Isc setting proposed in multiples (M) of In
b. Isc Current in amps corresponding to Isc setting = M*In
c. Proposed DT time in sec =
2.5
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
30000 20 342.95 0.35 DT zone
In = Rated current in amps corresponding to CT ratio of 1500/1A =
Time of Operation for Different Fault Current
System voltage in kV
Selected CT Ratio =
BASIC DATA
F. Settings of Relays for 6.6 KV Bus Coupler
IRm2 in amps = 4 x I ref
Rush I in amps = 0.2 x I ref
TMS =
Definite time setting =
Setting ranges :
I> DT
IDMT
I>> DT
I>>> DT
Relay used
Minimum symmetrical 3-Ph S/C current in amps at 11 KV bus =
Not used
Consultant : SATCON Page 9 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
4500 3 51.44 0.35 I>>
4500 3 51.44 1.30 DT zone
2250 1.5 25.72 1.30 I>
2250 1.5 25.72 4.73
11280 7.520 128.95 0.93
4500 3 51.44 1.73
3750 2.5 42.87 2.08
3000 2 34.29 2.76
2850 1.9 32.58 2.98 IDMT zone
2700 1.8 30.87 3.26
2550 1.7 29.15 3.61
2400 1.6 27.44 4.08
2250 1.5 25.72 4.73
2100 1.4 24.01 5.70
1950 1.3 22.29 7.32
1800 1.2 20.58 10.54
1650 1.1 18.86 20.18
2.6
a. 15o
b. 5.5 5%
c. 0.1
d. 20 > 20%e. 32 > 30%
1.0a 6.6
b 125/1 A
d 125 A
e 11280 A
g 250 KVAR
h 21.87 A
f. Relay used MICOM P127
g. Setting ranges : steps
I> 0.1-25In @ 0.01 In
I>> 0.5-40In @ 0.01 In
I>>> 0.5-40In @ 0.01 In
TMS = 0.025-1.5 @ 0.025
Definite time setting = 0-150 sec @ 0.01 sec
2.0 SETTING VALUES
Selected CT Ratio =
In = Rated current in amps corresponding to CT ratio of 125/1A =
25 Check Synchronisation
Vdiff setting in volts
Slip frequency setting in Hz
Dead Bus Charging Voltage setting in volts
BASIC DATA
Phase angle setting
System voltage in kV
Capacitor bank rating =
Live Bus Voltage setting in volts
G. Settings of Relays for 6.6 KV O/G Fdr to Capacitor bank
Load current =
Minimum symmetrical 3-Ph S/C current in amps at 6.6 KV bus =
Consultant : SATCON Page 10 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
2.1 Proposed Is (IDMT) setting for O/C (51)a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard Inverse
b. Plug setting (PS) proposed = 0.225
c. Is = Current in amps corresponding to PS = PS*In 28.125
d. Proposed TMS setting = 0.200
2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)a. Minimum Isc setting proposed in multiples M of In 4
b. Isc Current in amps corresponding to Isc setting = M*In 500
c. Proposed DT time in sec = 0.05
2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)a. Minimum Isc setting proposed in multiples (M) of In
b. Isc Current in amps corresponding to Isc setting = M*In
c. Proposed DT time in sec =
2.4
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
2500 20 28.58 0.05 DT zone
500 4 5.72 0.05 I>>
500 4 5.72 0.47
500 17.7777 5.72 0.47
281 10 3.22 0.59
169 6 1.93 0.77
113 4 1.29 1.00
56 2 0.64 2.01 IDMT zone
53 1.9 0.61 2.17 I>
51 1.8 0.58 2.37
48 1.7 0.55 2.62
45 1.6 0.51 2.96
42 1.5 0.48 3.44
39 1.4 0.45 4.15
37 1.3 0.42 5.32
34 1.2 0.39 7.66
31 1.1 0.35 14.67
2.5
a. 88 Bus PT supply =110V
b. 1.00
2.6a. 6.6 Bus PT supply =110V
b. 0.05
U< in volts = 0.8*Vn (For tripping)
DT setting in sec =
Residual overvoltage/neutral displacement protection (60)Ue> in volts = 0.06*Vn (For Alarm)
DT setting in sec =
Undervoltage protection (27)
Not used
Time of Operation for Different Fault Current
Consultant : SATCON Page 11 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
c. 22
d. 0.1
1.0
a. 6.6 kV
b. 250/1 A
c. 250 A
d. 11280 A
e. 2165 A
f. 140 A
g. MICOM P122
h. steps
0.1-25In @ 0.01 In
0.5-40In @ 0.01 In
0.5-40In @ 0.01 In
0.025-1.5 @ 0.025
0-150 sec @ 0.01 sec
2.0 SETTING VALUES
2.1 Proposed Is (IDMT) setting for O/C (51), I>a. Curve used for Is (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.75c. Is = Current in amps corresponding to PS = PS*In 187.5
d. Proposed TMS setting = 0.375
2.2 Proposed Is (DT) setting for O/C (I>>) (50-1/DT)a. Minimum Isc setting proposed in multiples M of In 0.9
b. Isc Current in amps corresponding to Isc setting = M*In 225
c. Proposed DT time in sec = 1
2.3 Proposed Is (DT) setting for S/C (I>>>) (50-2/DT)a. Minimum Isc setting proposed in multiples (M) of In 11.5
b. Isc Current in amps corresponding to Isc setting = M*In 2875
c. Proposed DT time in sec = 0.05
2.4 Time of Operation for Different Fault Current
Current in Amps Multiples of Set Current
Equivalent MVA
Time of Operation in sec. Zone of Operation
5000 20 57.16 0.05 DT Zone
2875 11.5 32.87 0.05 (I>>>)
2875 11.5 32.87 1.00
BASIC DATA
In = Rated current in amps corresponding to CT ratio of 250/1A =
Reflected current on 6.6 KV side due to fault on 415V side of trafo and minimum fault level condition =
DT setting in sec =
Minimum symmetrical 3-Ph S/C current in amps at 6.6 KV bus =
Ue>> in volts = 0.2*Vn (For tripping)
I>>
Selected CT Ratio =
System voltage
H. Settings of Relays for 6.6 KV O/G Fdr to 1600 KVA Transformer
Rated primary current in amps of 1600 KVA Transformer =
TMS =
Definite time setting =
Relay used
Setting ranges :
I>
I>>>
Consultant : SATCON Page 12 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
2875 11.5 32.87 1.00 DT Zone
225 0.9 2.57 1.00 (I>>)
225 0.9 2.57 14.37
11280 60.16 128.95 0.61
2165 11.55 24.75 1.05
1688 9.00 19.29 1.17
938 5.00 10.72 1.60
375 2.00 4.29 3.76
356 1.9 4.07 4.06 IDMT zone
338 1.8 3.86 4.44 I>
319 1.7 3.64 4.92
300 1.6 3.43 5.56
281 1.5 3.22 6.45
263 1.4 3.00 7.78
244 1.3 2.79 9.98
225 1.2 2.57 14.37
206 1.1 2.36 27.52
1 RELAY TYPE MICOM P922
1.1 110
1.2
a. 44b. 2.5
c. 88
d. 2
1.3
a. 121
b. 1
1.4
a. 6.6
b. 0.05
c. 20
d. 0.1
1.0 BASIC DATA
Overvoltage protection (59)
Rated PT secondary voltage (Vn)
Undervoltage protection (27)
V0>> in volts = 0.2*Vn (for tripping of respective I/C)
DT setting in sec =
V> in volts = 1.1*Vn (For annunciation and tripping of capacitor feeders)
DT setting in sec =
Residual overvoltage/neutral displacement protection (60)
V0> in volts = 0.06*Vn (For Alarm)
DT setting in sec =
V< in volts = 0.4*Vn (I/C and B/C brkr closing circuit interlock)DT setting in sec =
V<< in volts = 0.8*Vn (I/C and B/C brkr closing circuit interlock, u/v trip of motor feeders)
DT setting in sec =
J. Settings of Relays for IC & BC at 415V PCC
I. Settings of Relays for 6.6 KV Bus PT
Consultant : SATCON Page 13 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
a. System voltage in kV 0.415 kV
b. Selected CT Ratio = 3000/5 A
c. 33007 A
d. 3000 A
e. Relay used SPAJ 140C (ABB)
f. Setting ranges :
I> inverse 0.5 - 2.5 In
I> definite time 0.5 - 5.0 In
I>> definite time 0.5 - 40.0 In and infinity
TMS = 0.05 - 1.0
Definite time setting for I> = 0.05 - 300s
Definite time setting for I>> = 0.04 - 300s
g. Transformer rating = 1600 kVA
h. Voltage ratio = 6600/433 V
i. Transformer full load current, HV = 140 A
j. Transformer full load current, LV = 2133 A
k. Transformer vector group = Dyn11
l. Transformer % impedance = 6.25%
m. Through fault current at LV side = 33007 A (From ETAP output)
n. Through fault current at HV side = 2165.46 A
2.0 SETTING VALUES
2.1 Proposed I> (IDMT) setting for O/C (51),
a. Curve used for I> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.85
c. I> = Current in amps corresponding to PS = PS*In 2550
d. Proposed TMS setting = 0.275
2.2 Proposed I> (DT) setting for O/C (50) 1.1
a. Minimum Isc setting proposed in multiples M of In 3300
b. Isc Current in amps corresponding to Isc setting = M*In 0.7 (Assumed)
c. Proposed DT time in sec =
2.3 Proposed I>> (DT) setting for O/C (50)
a. Minimum Isc setting proposed in multiples (M) of In
b. Isc Current in amps corresponding to Isc setting = M*In
c. Proposed DT time in sec =
2.4 Time of Operation for Different Fault Current
Symmetrical S/C current in amps at 415V bus during 3phase fault =
In = Rated primary current in amps corresponding to selected CT ratio
Not used
Consultant : SATCON Page 14 of 15
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Overcurrent and Voltage operated Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
60000 20 43.13 0.7 DT Zone
3300 1.1 2.37 0.7 (I>>)
3300 1.1 2.37 7.45
33007 12.9439 23.73 0.73
25500 10 18.33 0.82
22950 9 16.50 0.86
20400 8 14.66 0.91
17850 7 12.83 0.97
15300 6 11.00 1.06
12750 5 9.16 1.18 IDMT Zone
10200 4 7.33 1.37 (I>)
7650 3 5.50 1.73
5100 2 3.67 2.76
4845 1.9 3.48 2.98
4590 1.8 3.30 3.26
4335 1.7 3.12 3.61
4080 1.6 2.93 4.08
3825 1.5 2.75 4.73
3570 1.4 2.57 5.70
3315 1.3 2.38 7.32
3300 1.29411 2.37 7.45
3060 1.2 2.20 10.54
2805 1.1 2.02 20.18
2.5a. Relay used VAGM22
b. 40-80 %
c. Inst.
d. 40 %
e. Tripping & Annc.
2.6
a. VAGM22
b. 110-140 %
c. Inst.
d. 110 %
e. Tripping
Time =
Selected setting =
Purpose
Available setting =
Time =
Selected setting =
Purpose
Available setting =
Overvoltage protection (59) at incomer
Relay used
Undervoltage protection (27) at incomer
Consultant : SATCON Page 15 of 15
OVERCURRENT COORDINATION CHART FOR LBDS-9
10
1
TIM
E IN
SEC
ON
DSTI
ME
IN S
ECO
NDS
0.1
0.01
1.00 10.00 100.00 1000.00MVA
33kV INCOMER 33KV BUS COUPLER 33KV TRAFO FDR 6.6KV INCOMER
6.6KV BUS COUPLER 6.6KV TRAFO FDR LTPCC 415V PCC INCOMER
CONSORTIUM
Subject. - Relay Setting Calculation – Doc. No. ISP/AREVA-EMC-A/IX/22/16/29/DE/1007J Project LBDS Package – 22 - New Stream 2.5 MT Expansions at IISCO Steel Plant Page- 1
RELAY SETTING CALCULATION FOR EARTH FAULT RELAYS OF LBDS-9
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
A. 33kV INCOMER
1.0 BASIC DATA
Consultant : SATCON Page 2 of 12
1.0 BASIC DATA
a. System voltage in kV 33 kV
b. Selected CT Ratio = 800/1 A
c. 400 A
d. 800 A
e. Relay used MICOM P127
f. Setting ranges :
Symmetrical S/C current in amps at 6.6kV bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio, In =
f. Setting ranges :
Ie> 0.1 - 1.0 In @ 0.005 In (Inverse time)Ie>> 0.1 - 8 In @ 0.005 In (Definite time)TMS = 0.025 - 1.5 @ 0.025
Definite time setting = 0 - 150 sec @ 0.01 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),2.1 Proposed Ie> (IDMT) setting for E/F (51N),
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.15
c. Ie> = Current in amps corresponding to PS = PS*In 120
d. Proposed TMS setting = 0.15
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.25
b. Isc Current in amps corresponding to Isc setting = M*In 200
c. Proposed DT time in sec = 0.7
2.3 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
16000 20 914.52 0.7 DT Zone
200 0.25 11.43 0.7 (Ie>>)
200 0.25 11.43 2.05
2400 20 137.18 0.34
1800 15 102.88 0.38
1200 10 68.59 0.451200 10 68.59 0.45
1080 9 61.73 0.47
960 8 54.87 0.49
840 7 48.01 0.53
720 6 41.15 0.58 IDMT Zone
600 5 34.29 0.64 (Ie>)
480 4 27.44 0.75
400 3.3333 22.86 0.86
360 3 20.58 0.95
240 2 13.72 1.50
Consultant : SATCON Page 2 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
228 1.9 13.03 1.63
216 1.8 12.35 1.78
204 1.7 11.66 1.97
Consultant : SATCON Page 3 of 12
204 1.7 11.66 1.97
200 1.6666 11.43 2.05
192 1.6 10.97 2.22
180 1.5 10.29 2.58
168 1.4 9.60 3.11
156 1.3 8.92 3.99
144 1.2 8.23 5.75
132 1.1 7.54 11.01132 1.1 7.54 11.01
B. 33kV BUS COUPLER
1.0 BASIC DATA
a. System voltage in kV 33 kV
b. Selected CT Ratio = 400/1 A
c. 400 A Symmetrical S/C current in amps at 6.6kV bus during SLG fault = c. 400 A
d. 400 A
e. Relay used MICOM P132
f. Setting ranges :
Ie> 0.01 - 4.0 In (Inverse time)Ie>> 0.002 - 8.0 In (Definite time)
Symmetrical S/C current in amps at 6.6kV bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio, In =
Ie>> 0.002 - 8.0 In (Definite time)TMS = 0.05 - 10
Definite time setting = 0 - 100 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.2b. Plug setting (PS) proposed = 0.2
c. Ie> = Current in amps corresponding to PS = PS*In 80
d. Proposed TMS setting = 0.125
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.4
b. Isc Current in amps corresponding to Isc setting = M*In 160
c. Proposed DT time in sec = 0.4
2.3 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
8000 20 457.26 0.4 DT Zone
160 0.4 9.15 0.4 (Ie>>)
160 0.4 9.15 1.25
Consultant : SATCON Page 3 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
800 10 45.73 0.37
720 9 41.15 0.39
Consultant : SATCON Page 4 of 12
720 9 41.15 0.39
640 8 36.58 0.41
560 7 32.01 0.44
480 6 27.44 0.48 IDMT Zone
400 5 22.86 0.53 (Ie>)
240 3 13.72 0.79
160 2 9.15 1.25
152 1.9 8.69 1.35152 1.9 8.69 1.35
144 1.8 8.23 1.48
136 1.7 7.77 1.64
128 1.6 7.32 1.85
120 1.5 6.86 2.15
112 1.4 6.40 2.59
104 1.3 5.94 3.33
96 1.2 5.49 4.7996 1.2 5.49 4.79
88 1.1 5.03 9.17
C. 33kV TRANSFORMER FEEDER FOR 25/31.5 MVA TRAFO
1.0 BASIC DATA
a. System voltage in kV 33 kV
b. Selected CT Ratio = 600/1 A
c. 400 A
d. 600 A
e. Relay used MICOM P122
f. Setting ranges :
Ie> 0.1 - 1.0 In @ 0.005 In (Inverse time)
Symmetrical S/C current in amps at 6.6kV bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio, In =
(Inverse time)Ie>> 0.1 - 8 In @ 0.005 In (Definite time)TMS = 0.025 - 1.5 @ 0.025
Definite time setting = 0 - 150 sec @ 0.01 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.1b. Plug setting (PS) proposed = 0.1
c. Ie> = Current in amps corresponding to PS = PS*In 60
d. Proposed TMS setting = 0.05
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.2
b. Isc Current in amps corresponding to Isc setting = M*In 120
c. Proposed DT time in sec = 0.1
2.3 Time of Operation for Different Fault Current
Consultant : SATCON Page 4 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT
EQUIVALENT MVA
TIME OF OPERATIOM
ZONE OF OPERATION
Consultant : SATCON Page 5 of 12
AMPS (I) SET CURRENT (M)
MVA OPERATIOM (sec)
OPERATION
I = MxIs M MVA sec
12000 20 685.89 0.1 DT Zone
120 0.2 6.86 0.1 (Ie>>)
120 0.2 6.86 0.50
1200 20 68.59 0.11
900 15 51.44 0.13
600 10 34.29 0.15
540 9 30.87 0.16
480 8 27.44 0.16
420 7 24.01 0.18
400 6.6666 22.86 0.18
360 6 20.58 0.19 IDMT Zone
300 5 17.15 0.21 (Ie>)300 5 17.15 0.21 (Ie>)
240 4 13.72 0.25
180 3 10.29 0.32
120 2 6.86 0.50
114 1.9 6.52 0.54
108 1.8 6.17 0.59
102 1.7 5.83 0.66
96 1.6 5.49 0.7496 1.6 5.49 0.74
90 1.5 5.14 0.86
84 1.4 4.80 1.04
78 1.3 4.46 1.33
72 1.2 4.12 1.92
66 1.1 3.77 3.67
D. 6.6KV INCOMER FROM 25/31.5 MVA TRAFOD. 6.6KV INCOMER FROM 25/31.5 MVA TRAFO
1.0 BASIC DATA
a. System voltage in kV 6.6 kV
b. Selected CT Ratio = 3000/1 A
c. 600 A
d. 3000 A
Symmetrical S/C current in amps at 415V bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio, In =
e. Relay used MICOM P632
f. Setting ranges :
Ie> 0.1 - 0.8 In (Inverse time)Ie>> 0.1 - 8 In (Definite time)TMS = 0.05 - 10
Definite time setting = 0 - 100 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),
In =
Consultant : SATCON Page 5 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.1
c. Ie> = Current in amps corresponding to PS = PS*In 300
Consultant : SATCON Page 6 of 12
c. Ie> = Current in amps corresponding to PS = PS*In 300
d. Proposed TMS setting = 0.075
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.12
b. Isc Current in amps corresponding to Isc setting = M*In 360
c. Proposed DT time in sec = 0.7
2.3 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
60000 20 685.89 0.7 DT Zone
360 0.12 4.12 0.7 (Ie>>)360 0.12 4.12 0.7 (Ie>>)
360 0.12 4.12 2.87
3000 10 34.29 0.22
2700 9 30.87 0.23
2400 8 27.44 0.25
2100 7 24.01 0.26
1800 6 20.58 0.291800 6 20.58 0.29
1500 5 17.15 0.32 IDMT Zone
1200 4 13.72 0.37 (Ie>)
900 3 10.29 0.47
600 2 6.86 0.75
570 1.9 6.52 0.81
540 1.8 6.17 0.89
510 1.7 5.83 0.98
480 1.6 5.49 1.11
450 1.5 5.14 1.29
420 1.4 4.80 1.56
390 1.3 4.46 2.00
375 1.25 4.29 2.35
360 1.2 4.12 2.87
330 1.1 3.77 5.50
2.4
a. 300
b. 1.005 (fixed slope)
E. BACK UP E/F (51G) AT 25/31.5 MVA TRAFO NEUTRAL
1.0 BASIC DATA
a. System voltage in kV 0.415 kV
b. Selected CT Ratio = 600/1 A
REF (64R) [Biasing by residual current] Instantaneous
Idiff> in amps = 0.1*FLC
m =
Consultant : SATCON Page 6 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
c. 36950 A (Based on ETAP fault calculation)
d. 600 A
Symmetrical S/C current in amps at 415V bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio,
Consultant : SATCON Page 7 of 12
d. 600 A
e. Relay used MICOM P111
f. Setting ranges :
Ie> 0.01 - 1.0 In (Inverse time)TMS = 0.025 - 1.2
Rated primary current in amps corresponding to selected CT ratio, In =
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51G),
a Curve used for Ie>1 (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b Plug setting (PS) proposed = 0.55
c Ie> = Current in amps corresponding to PS = PS*In 330
d Proposed TMS setting = 0.1
2.2 Time of Operation for Different Fault Current2.2 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
6600 20 75.45 0.23
4950 15 56.59 0.254950 15 56.59 0.25
3300 10 37.72 0.30
2970 9 33.95 0.31
2640 8 30.18 0.33
2310 7 26.41 0.35
1980 6 22.63 0.38
1650 5 18.86 0.43
1320 4 15.09 0.50 IDMT Zone 1320 4 15.09 0.50 IDMT Zone
990 3 11.32 0.63 (Ie>)
660 2 7.54 1.00
627 1.9 7.17 1.08
600 1.8181 6.86 1.16
594 1.8 6.79 1.18
561 1.7 6.41 1.31
528 1.6 6.04 1.48528 1.6 6.04 1.48
495 1.5 5.66 1.72
462 1.4 5.28 2.07
429 1.3 4.90 2.66
396 1.2 4.53 3.83
363 1.1 4.15 7.34
F. 6.6kV BUS COUPLER
1.0 BASIC DATA
a. System voltage in kV 6.6 kV
Consultant : SATCON Page 7 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
b. Selected CT Ratio = 1500/1 A
c. 600 A Symmetrical S/C current in amps at 6.6kV bus during SLG fault =
Consultant : SATCON Page 8 of 12
d. 1500 A
e. Relay used MICOM P132
f. Setting ranges :
Ie> 0.01 - 4.0 In (Inverse time)Ie>> 0.002 - 8.0 In (Definite time)TMS = 0.05 - 10
Rated primary current in amps corresponding to selected CT ratio, In =
TMS = 0.05 - 10
Definite time setting = 0 - 100 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.09
c. Ie> = Current in amps corresponding to PS = PS*In 135c. Ie> = Current in amps corresponding to PS = PS*In 135
d. Proposed TMS setting = 0.1
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.15
b. Isc Current in amps corresponding to Isc setting = M*In 225
c. Proposed DT time in sec = 0.4
2.3 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
30000 20 342.95 0.4 DT Zone
225 0.15 2.57 0.4 (Ie>>)225 0.15 2.57 0.4 (Ie>>)
225 0.15 2.57 1.36
1350 10 15.43 0.30
1215 9 13.89 0.31
1080 8 12.35 0.33
945 7 10.80 0.35
810 6 9.26 0.38
675 5 7.72 0.43 IDMT Zone 675 5 7.72 0.43 IDMT Zone
600 4.4444 6.86 0.46 (Ie>)
405 3 4.63 0.63
270 2 3.09 1.00
257 1.9 2.93 1.08
243 1.8 2.78 1.18
225 1.66666 2.57 1.36
216 1.6 2.47 1.48
203 1.5 2.31 1.72
189 1.4 2.16 2.07
Consultant : SATCON Page 8 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
176 1.3 2.01 2.66
162 1.2 1.85 3.83
149 1.1 1.70 7.34
Consultant : SATCON Page 9 of 12
149 1.1 1.70 7.34
G. 6.6kV TRANSFORMER FEEDER FOR LTPCC
1.0 BASIC DATA
a. System voltage in kV 6.6 kV
b. Selected CT Ratio = 250/1 A
c. 600 A Symmetrical S/C current in amps at 6.6kV bus during SLG fault = c. 600 A
d. 250 A
e. Relay used MICOM P122
f. Setting ranges :
Ie> 0.1 - 1.0 In @ 0.005 In (Inverse time)Ie>> 0.1 - 8 In @ 0.005 In
Symmetrical S/C current in amps at 6.6kV bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio, In =
Ie>> 0.1 - 8 In @ 0.005 In (Definite time)TMS = 0.025 - 1.5 @ 0.025
Definite time setting = 0 - 150 sec @ 0.01 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.1b. Plug setting (PS) proposed = 0.1
c. Ie> = Current in amps corresponding to PS = PS*In 25
d. Proposed TMS setting = 0.075
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.2
b. Isc Current in amps corresponding to Isc setting = M*In 50
c. Proposed DT time in sec = 0.1c. Proposed DT time in sec = 0.1
2.3 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
5000 20 57.16 0.1 DT Zone 5000 20 57.16 0.1 DT Zone
50 0.2 0.57 0.1 (Ie>>)
50 0.2 0.57 0.75
600 24 6.86 0.16
375 15 4.29 0.19
250 10 2.86 0.22
225 9 2.57 0.23
200 8 2.29 0.25
175 7 2.00 0.26
150 6 1.71 0.29 IDMT Zone
Consultant : SATCON Page 9 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
125 5 1.43 0.32 (Ie>)
100 4 1.14 0.37
75 3 0.86 0.47
Consultant : SATCON Page 10 of 12
75 3 0.86 0.47
50 2 0.57 0.75
48 1.9 0.54 0.81
45 1.8 0.51 0.89
43 1.7 0.49 0.98
40 1.6 0.46 1.11
38 1.5 0.43 1.29
35 1.4 0.40 1.5635 1.4 0.40 1.56
33 1.3 0.37 2.00
30 1.2 0.34 2.87
28 1.1 0.31 5.50
H. 415V INCOMER AND BUS COUPLER
1.0 BASIC DATA1.0 BASIC DATA
a. System voltage in kV 0.415 kV
b. Selected CT Ratio = 3000/5 A
c. 36950 A (Based on ETAP fault calculation)
d. 3000 A
e. Relay used SPAJ 140C
Symmetrical S/C current in amps at 415V bus during SLG fault =
Rated primary current in amps corresponding to selected CT ratio, In =
e. Relay used SPAJ 140C
f. Setting ranges :
Ie> 0.1 - 0.8 In (Inverse time)Ie>> 0.1 - 10 In (Definite time)TMS = 0.05 - 1.0
Definite time setting = 0.05 - 300 sec
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51N),
a. Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b. Plug setting (PS) proposed = 0.1
c. Ie> = Current in amps corresponding to PS = PS*In 300
d. Proposed TMS setting = 0.525
2.2 Proposed Ie>> (DT) setting for E/F (50N)
a. Minimum Isc setting proposed in multiples M of In 0.12a. Minimum Isc setting proposed in multiples M of In 0.12
b. Isc Current in amps corresponding to Isc setting = M*In 360
c. Proposed DT time in sec = 0.7
2.3 Time of Operation for Different Fault Current
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
I = MxIs M MVA sec
60000 20 43.13 0.7 DT Zone
Consultant : SATCON Page 10 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
360 0.12 0.26 0.7 (Ie>>)
360 0.12 0.26 20.12
Consultant : SATCON Page 11 of 12
36950 123.1666 26.56 0.73
4500 15 3.23 1.32
3000 10 2.16 1.56
2700 9 1.94 1.64
2400 8 1.73 1.73
2100 7 1.51 1.85
1800 6 1.29 2.01 IDMT Zone 1800 6 1.29 2.01 IDMT Zone
1500 5 1.08 2.25 (Ie>)
1200 4 0.86 2.61
900 3 0.65 3.31
600 2 0.43 5.27
570 1.9 0.41 5.69
540 1.8 0.39 6.22
510 1.7 0.37 6.89510 1.7 0.37 6.89
480 1.6 0.35 7.78
450 1.5 0.32 9.03
420 1.4 0.30 10.89
390 1.3 0.28 13.97
375 1.25 0.27 16.43
360 1.2 0.26 20.12
330 1.1 0.24 38.52
J. BACK UP E/F (51G) AT 1.6 MVA TRAFO NEUTRAL
1.0 BASIC DATA
a. System voltage in kV 0.415 kV
b. Selected CT Ratio = 500/5 A
c. 36950 A (Based on ETAP fault calculation)Symmetrical S/C current in amps at 415V bus during SLG fault =
d. 500 A
e. Relay used CDG 11 (3 sec version)
f. Setting ranges :
Ie> 0.2 - 0.8 In (Inverse time)TMS = 0.1 - 1.0
Rated primary current in amps corresponding to selected CT ratio, In =
2.0 SETTING VALUES
2.1 Proposed Ie> (IDMT) setting for E/F (51G),
a Curve used for Ie> (IDMT) setting : t = TMS[0.14/{(I/Is)^0.02-1}] IEC SI Standard inverse
b Plug setting (PS) proposed = 0.6
c Ie> = Current in amps corresponding to PS = PS*In 300
d Proposed TMS setting = 0.75
2.2 Time of Operation for Different Fault Current
Consultant : SATCON Page 11 of 12
SAIL, ISP Package-22Relay Setting Calculation & Charts
Settings of Various Earth Fault Relays for LBDS-9Drawing no. ISP/AREVA-EMC/A/IX/22/16/29/DE/01007J
CURRENT IN AMPS (I)
MULTIPLES OF SET CURRENT (M)
EQUIVALENT MVA
TIME OF OPERATIOM (sec)
ZONE OF OPERATION
Consultant : SATCON Page 12 of 12
(M) (sec)
I = MxIs M MVA sec
36950 123.1666 26.56 1.04
4500 15 3.23 1.89
3000 10 2.16 2.23
2700 9 1.94 2.34
2400 8 1.73 2.47
2100 7 1.51 2.652100 7 1.51 2.65
1800 6 1.29 2.88
1500 5 1.08 3.21
1200 4 0.86 3.73 IDMT Zone
900 3 0.65 4.73 (Ie>)
600 2 0.43 7.52
570 1.9 0.41 8.13
540 1.8 0.39 8.88540 1.8 0.39 8.88
510 1.7 0.37 9.84
480 1.6 0.35 11.12
450 1.5 0.32 12.90
420 1.4 0.30 15.55
390 1.3 0.28 19.96
360 1.2 0.26 28.74
330 1.1 0.24 55.03330 1.1 0.24 55.03
Consultant : SATCON Page 12 of 12
EARTH FAULT PROTECTION COORDINATION CURVES FOR 415V
Consultant : SATCON
0.1
1
10
100
0.10 1.00 10.00 100.00
415V Incomer Back Up 51G SLGF fault Current 36950A
SLG
Faul
t Cur
rent
=
3695
0A
MVA
TIM
E IN
SEC
EARTH FAULT PROTECTION COORDINATION CURVES FOR 6.6KV
Consultant : SATCON
0.1
1
10
0.10 1.00 10.00 100.00 1000.00
6.6kV TRAFO FDR 6.6KV BUS COUPLER 6.6KV INCOMER 51G at 6.6kV NEUTRAL 600A SLG FAULT
600A
SLG
MVA
TIM
E IN
SEC
EARTH FAULT PROTECTION COORDINATION CURVES FOR 33KV
Consultant : SATCON
0.1
1
10
100
1.00 10.00 100.00 1000.00
33kV TRAFO FDR 33KV BUS COUPLER 400A SLG FAULT 33KV INCOMER
400A
SLG
Faul
t Cu
rren
t
MVA
TIM
E IN
SEC
Location: BURNPUR
Engineer: SATCONStudy Case: SC
7.0.0C
Page: 1
SN: SATCON2007
Filename: LBDS9LT
Project: ISP MODERNISATION ETAP
Contract: AREVA
Date: 07-08-2011
Revision: Base
Config.: Normal
SHORT CIRCUIT CALCULATION AT LT BUS
Short-Circuit Summary Report
3-Phase, LG, LL, LLG Fault Currents
ID kV
Bus
I"k ip Ik I"k I"k Ikip ip I"kIb Ib Ib
3-Phase Fault Line-to-Ground Fault Line-to-Line Fault *Line-to-Line-to-Ground
Ik ip Ik
LV SWBD 0.433 33.007 79.775 33.007 36.954 89.314 36.954 36.954 28.585 69.087 28.585 28.585 86.248 35.685 35.685 35.685
All fault currents are in rms kA. Current ip is calculated using Method C.
* LLG fault current is the larger of the two faulted line currents.
Location: BURNPUR
Engineer: SATCONStudy Case: SC
7.0.0C
Page: 2
SN: SATCON2007
Filename: LBDS9LT
Project: ISP MODERNISATION ETAP
Contract: AREVA
Date: 07-08-2011
Revision: Base
Config.: Normal
SHORT CIRCUIT CALCULATION AT LT BUS
Sequence Impedance Summary Report
ID kV
Bus
Resistance Reactance Impedance
Positive Seq. Imp. (ohm) Negative Seq. Imp. (ohm)
Resistance Reactance Impedance
Zero Seq. Imp. (ohm)
Resistance Reactance Impedance
Fault Zf (ohm)
Resistance Reactance Impedance
LV SWBD 0.433 0.00093 0.00790 0.00795 0.00075 0.00535 0.00541 0.00093 0.00790 0.00795 0.00000 0.00000 0.00000
One-Line Diagram - OLV1 (Short-Circuit Analysis - 3 PHASE FAULT)
page 1 10:37:45 Aug 07, 2011 Project File: LBDS9LT
LV SWBD0.433 kV
33.0 kA
MV SWBD6.6 kV
5.28 kV
6.6KV BUS129 MVAsc
2.17
T1
6.25 %Z6.6/0.433 kV
DS 1.6 MVA
33.01
LV LOAD1.2 MVALV LOAD1.2 MVA
6.6KV BUS129 MVAsc
T1
6.25 %Z6.6/0.433 kV
DS 1.6 MVA
MV SWBD6.6 kV
LV SWBD0.433 kV
33.0 kA
5.28 kV
2.17
33.01
One-Line Diagram - OLV1 (Short-Circuit Analysis - SLG FAULT)
page 1 10:38:58 Aug 07, 2011 Project File: LBDS9LT
LV SWBD0.433 kV
0.23 kV
36.95 kA
MV SWBD6.6 kV
3.81 kV
6.6KV BUS129 MVAsc
T1
6.25 %Z6.6/0.433 kV
DS 1.6 MVA
36.95
LV LOAD1.2 MVA
LV SWBD0.433 kV
0.23 kV
36.95 kA
MV SWBD6.6 kV
3.81 kV
6.6KV BUS129 MVAsc
T1
6.25 %Z6.6/0.433 kV
DS 1.6 MVA
36.95
LV LOAD1.2 MVA