Transformer Ratings

[ksunny]

Fault current PU value will remain same but if I multiply PU value with the base current value (I_base=MVA rating/(1.732xV)) for amperage value the result will be different depending on the MVA rating being used .So in this situation should I use OA rating ?

By true rating I meant rating that can be used to find missing values i.e current on primary or secondary side of transformer.

 

[Warrior PE]

I might be wrong here but i think fault MVA and transformer MVA are two separate things when it comes to fault calculation. Fault MVA determines fault current, same fault current will flow through the transformer.