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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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