A 150-MVA 15/200-kV single-phase power transformer has a 0.018ohm resistance and a 0.075ohm reactance. The magnetizing impedance is j80 per unit.
a.) Find the equivalent circuit referred to the low-voltage side of this transformer.
b.) Calculate the voltage regulation of this transformer for a full-load current at power factor of 0.8 lagging.
c.) Calculate the copper and core losses in transformer at the conditions in (b).
d.) Calculate efficiency.