I HAVE A 1 MVA TRANSFORMER, I WANT TO KNOW THE FAULT LEVEL OF THE SYSTEM ( WHA

Categories >> Engineering >> Electrical Engineering
Suggest New Category

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

Question Posted / panchal

5 Answers
21890 Views
Alstom, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

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

Answer / satyajit sadhu

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..

Answer / shivakumar kinni

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..

Answer / mrudang

the above answer is right

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..

Answer / raj l. lahare

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