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Sr. No. Voltage Amps MVA Qty.
220KV
28.737KA 3329.1
MVA3 0.003
4 2
5 220/33KV 42/280A 16 MVA
6
7 220/33 Kv
0.468/
3.11KA
178.13MVA
80.5613
12
Sr. No. Voltage Amps MVA Qty.
220KV
4 2
5 220/33KV 42/280A 50 MVA
7 220/33 Kv
1.233/
8.22KA
Considering 100MVA
Base
Remarks
3329.1 MVA8.737KA PU Rectance=Base
MVAFualt MVA
Xs=1003329.1
PU Rectance=Base
0.003
Considering 100MVA
Base
PU Rectance=Base
MVAFualt MVA
Xs=100470
PU Rectance=Base
MVAFualt MVA
Xs=1003329.1
PU Rectance=Base
MVAFualt MVA
Xs=100178.13
PU Rectance=BaseMVAFualt MVA
Considering 100MVABase
Considering 100MVA
9.98% cosidering 90% i.e. 8.982%
N0. of the transformer
Rating of each trans.
11.82% cosidering 90% i.e. 10.638%
Fault rating of each
transfo.
PU Reactance of
Each Trafo.
Total PU Reactance
8
PU Reactance of
System (Xs)
1
10
Fault Level At 33 side
Total PU Impedance
( Xs+Xt)
System Voltage
11
erna ve-Description
FAULT LEVEL CALCULATION(PU Method)
At 33 KV side of SPS Site.
Alternative-1Description Remarks
6
3
2 Fault Level
% Impedance.of each
trafo.
Base(100)(Xs+St)=
321.85
1
PU Reactance of
0.3107
System Voltage
Fault Level
N0. of the transformer
Rating of each trans.
PU Reactance ofEach Trafo.
Total Fault Current At
33KV Side5.63KA
% Impedance.of each
trafo.
Fault rating of each
transfo.
0.212
470MVA
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12
Sr. No. Voltage Amps MVA Qty.
220KV
4 2
5 220/33KV 183.7/1224 70 MVA
7 220/33 Kv
1.63/
10.868KA
12
Sr. No. Voltage Amps MVA Qty.
1 220KV
2 8.737KA 3329.1MVA
3 2
4 220/33KV 42/280A 16 MVA
5
6 220/33 Kv
0.468/3.11
KA
178.13MVA
7
0.936/6.22
KA
356.26MVA
8
12.83KA
Fault Current=Base
MVATotal PU
Impdance
Fault Current=BaseMVATotal PU
ImpdanceFault Current At 33
KV Side 15.83KA
PU Rectance=Base
MVAFualt MVA
Xs=100(2x621.22)
12.52% cosidering 90% i.e. 11.268% PU Rectance=BaseMVAFualt MVA
Xs=100621.22Fault rating of each
transfo.
621.22 MVA
10
Total PU Impedance
( Xs+Xt)
0.1105
11
Fault Level At 33 side Base(100)(Xs+St)=
904.97
9
Total PU Reactance
of Trafo (Xt) 0.080486
8
PU Reactance of
Each Trafo.
Considering 100MVA
Base 0.17
Fault Level
8.737KA 3329.1 MVA
N0. of the transformer
Rating of each trans.
6% Impedance.of eachtrafo.
Description Remarks
1 System Voltage
PU Rectance=Base
MVAFualt MVA
Xs=1003329.1
3
PU Reactance of
System (Xs)
Considering 100MVA
Base 0.003
2
Alternative-3
10
11
9
Fault Level At 33 side
Total PU Impedance
( Xs+Xt)
Fault Current At 33
KV Side
Base(100)(Xs+St)=
733.24
0.10638
MVAFualt MVA
Xs=100(2x470)
of Trafo (Xt)
0.13638
N0. of the transformer
Rating of each trans.
% Impedance.of each 9.98% cosidering 90% i.e. 8.982%
Z=3329.1x356.26
Total Fault Rating for
both Trafo.
16x1008.982=
178.13MVA
Total Impedance
Fault rating of each
transfo.
FAULT LEVEL CALCULATION(Simple Method)
Description
System Voltage
Fault Level
At 33 KV side of SPS Site.
Remarks
Alternative-1
0.844/5.63 321.82MVA
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9
1 220KV
2 8.737KA 3329.1MVA
3 2
4 220/33KV
131.12/875
Amps
50 MVA
6 220/33 Kv
1.23/8.22K
A
470 MVA
7
2.44/16.22
KA
940MVA
8
9
Sr. No. Voltage Amps MVA Qty.
1 220KV
2 8.737KA 3329.1MVA
3 2
4 220/33KV 42/280A 70 MVA
5
6 220/33 Kv 1.63/10.86KA621.22MVA
7
3.26/21.75
KA
1242.45MVA
1 220KV
2 Fault Level at
220KV KV side of
System 332.1 MVA At Budipadar S/S
3 220KV
KV side of
System
4
33 KV side of
the system.
Fault rating of eachtransfo.
Fault Level
N0. of the transformer
Total Impedance
during Fault
2.37/15.83
KA
904.77 MVA
Rating of each trans.
Total Fault current At
33KV Side9 15.83 KA
8
% Impedance.of each 12.52% cosidering 90%
Z=3329.1x1242.45
3329.1+1242.45=
904.77
Fault rating of each
transfo.
Total Fault Rating for
both Trafo.
Alternative-3
70x1008.982=621.22MVA
Total Fault Rating for
both Trafo.
Remarks
Alternative-2
Description
3329.1+356.26=
321.82
during Fault(Z)
Total Impedance
during Fault(Z)
.896/5.98
KA
733.02MVA
Total Fault Current At 12.82 KA
Fault Level
N0. of the transformer
Rating of each trans.
KA
Total Fault Current At 5.63 KA
System Voltage
Fault Level CalculationAlternative-1
Voltage Level of the System
Fault current at
8.737KA at Budipadar
S/S
5
11.82% cosidering 90% i.e.10.638%% Impedance.of each
trafo.
System Voltage
Z=3329.1x940
3329.1+940=
733.02
It is required to be
determine the fault
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5
2 ( considering
future
extention)
6
16MVA
220/33 KV At
ONAF
cooling
7 9.98%8 8.98%
9 100
10
220KV
Side
11
100 MVA
base0.56
12
100 MVA
base
Xt=0.2806
9
13 Xs+Xt= 0.3107
14 33 KV
15 5.63 KA
1 220KV
2 220KV
KV side of
System
3 220KV
KV side of
System
8.737 At
Budipadar
S/S
4
33 KV side of
the system.
5
2 ( considering
future
extention)
6
50MVA
220/33 KV At
ONAF
cooling
7 11.82%
8 10.64%
9 100
10 220KV Side
11
100 MVA
base0.21
12
100 MVA
base
Xt=0.1063
8
13 Xs+Xt= 0.1364
14 33 KV
15 12.83 KA
1 220KV
2 220KV
KV side of
System
3 220KV
KV side of
System
8.737 At
Budipadar
S/S
with 10% negative
Let consider base
PU Reactance of the
system UpTo
PU Reactance of
Each Tranfo.at
No. of Transformer
Installed in the S/S
Rating of Each
Transformer
Reactance of Each
fault Current at 33 kv side of System
Alternative-IIVoltage Level of the System
PU equivelent
Reactance Of Tranfo.
Total PU equivelent
Fault Level at Side of System,=Base MVA/PU
Rating of Each
Transformer
Reactance of Each
with 10% negative
Let consider base
Fault Level at
Fault current at
It is required to be
determine the fault
No. of Transformer
Installed in the S/S
Fault Level at Side of System,=Base MVA/PU
fault Current at 33 kv side of System
PU Reactance of the
PU Reactance of
Each Tranfo.at
PU equivelent
Reactance Of Tranfo.
Total PU equivelent
Alternative-IIIVoltage Level of the System
Fault Level at
Fault current at
332.1 MVA At
Budipadar S/S
Xs=BaseMVA/Fault
MVA=0.0300
332.1 MVA At
Budipadar S/S
Xs=BaseMVA/Fault
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4
33 KV side of
the system.
5
2 ( considering
future
extention)
670MVA
220/33 KV At
ONAFcooling
7 12.52%
8 11.27%
9 100
10 220KV Side
11
100 MVA
base0.16
12
100 MVA
base
Xt=0.0804
9
13 Xs+Xt= 0.1105
14 33 KV
15 15.83 KA
1 33KV
2 904.78MVA
3
Fault
current at 15.83KA
4
5 2 Nos.
6 10MVA
7 8.40%
8
9 100MVA
10 33 KV Side 0.1105
11 0.76
12 Xt=0.378
Xs+Xt= 0.4885
15
It is required to be
determine the fault
No. of Transformer
Installed in the S/S
Rating of Each
Transformer
Reactance of Each
PU equivelent
Reactance Of Tranfo.
Total PU equivelent
Fault Level at Side of System,=Base MVA/PU
with 10% negative
Let consider base
PU Reactance of the
PU Reactance of
Each Tranfo.at
33KV side of system
It required to be
determine the fault
level at
6.6 KV of system
No. of Tranfo.
Installed in S/S
fault Current at 33 kv side of System
Voltage Level of the
Fault level At 33KV side of system
Assumed 7.56%
Let Cosider base
MVA
PU Reactance of
system upto
XS=Base MVA / Fault
MVA
Rating Of Each trafo.33KV/6.6KV
Reactance of eachTrafo.
With 10% Negative
tolerance reactance
of each trafo.
6.6 KV side of system=BaseMVA/PU
Equivelent Reactance=
204.7
MVA
PU Reactance of
each trafo at
100 MVA
Base
PU Equivelent
reactance of trafo. Inparallel.At
100 MVA
base
Xs=BaseMVA/Fault
Fault current at 6.6 KV side of system=BaseMVA/PU 17.91 KA
Total PU Equivelent
Reactance
Fault level at
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Equivelent Reactance=
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