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I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF
THE SYSTEM ( WHAT IS FAULT LEVEL PLEASE EXPLAIN WITH EXAMPLE)

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I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF THE SYSTEM ( WHAT IS FAULT LEVEL PLE..

FAULT LEVEL MEANS SHORT CIRCUIT CAPACITY OF TRANSFORMER.YOU
HAVE NOT MENTIONED THE VALUE OF TRANSFORMER RATIO & % OF
IMPEDENCE.ASSUMED VOLTAGE RATIO= 11KV/415 V & % OF
IMPEDENCE=6%.
RATED FULL LOAD AMP OUTPUT =1MVA/(415 X 1.732)=1391.25A
SO SHORT CIRCUIT CAPACITY OF TRANSFORMER= 1391.25/6%
=23187.44 A
IF ANY FAULT OCCURED THEN THE ABOVE TRANSFORMER WITHSTAND
THE SHORT CIRCUIT CURRENT OF 23187 A.

 Is This Answer Correct ? 33 Yes 4 No

I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF THE SYSTEM ( WHAT IS FAULT LEVEL PLE..

1 MVA, 11/0.415kV Transformer

Full load current= 1000000/(1.732x415) = 1391.24A

% Z(Impedance)=5 (As per IS 2026 for transformer ratings of
0.631 MVA to 1.24 MVA)

Fault current= IFL/%Z =1391.24/0.05 =27.824 kA

 Is This Answer Correct ? 18 Yes 3 No

I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF THE SYSTEM ( WHAT IS FAULT LEVEL PLE..

 Is This Answer Correct ? 10 Yes 3 No

I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF THE SYSTEM ( WHAT IS FAULT LEVEL PLE..

For correct Fault level the DATA given is not sufficient. You need to give the Voltage Ratio and the % impedance of the Transformer.

 Is This Answer Correct ? 1 Yes 0 No

I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF THE SYSTEM ( WHAT IS FAULT LEVEL PLE..

above ans. is right

 Is This Answer Correct ? 2 Yes 2 No

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