Transformer PU referred to LV

Now let us consider supply is given to LV side of the transformer and HV side is shorted now we will solve this case using pu values

LV side voltage applied is 440V. This voltage when converted to pu voltage will be 

Here for calculating pu value of supply voltage we have taken base kV as 33kV as supply is from LV side where base kV is rated LV side kV of the transformer. This arrangement is as shown in following figure.

Hence short circuit current in pu will be

LV side base current will be

Thus actual current will be

Here we have calculated short circuit currents using same pu value of the transformer leakage reluctance as that of HV side.