Answer / naresh kinger

First calculate the short circuit current on the secondry
side. It will be = FLC/percentage inpedence X 100.

Now you can calculate primary current using tranformer
ratio.

Answer / naresh kinger

It will be 139/4.7 x 100 = 3415 AMP on secondry side.

Since ratio is 1/1, primary current will also be 3415 AMP.

Hope it clear now. For any doubt, you can write me at
n.k.kinger@gmail.com

Answer / ravishankar

flc is 139amps .then impedance of the transformer is 4.07
then it is 34.15 amps.ratio is 1:1
is the primary current34.15?

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