A 100kVA transformer has 400 turns on the primary and 80 turns on the secondary. The primary

and secondary resistances are 0.3ohms and 0.01ohm respectively, and the corresponding leakage

reactances are 1.1ohms and 0.035ohm respectively. The supply voltage is 2.2kV. Calculate equivalent

impedance of the transformer referred to the primary side, and the magnitude of the secondary

terminal voltage for full load having a power factor of 0.8 lagging. Repeat this for full load with a

power factor of 0.8 leading. Assume as an approximation that the power factors seen on the

primary and secondary side of the transformer are the same and Sin=Sload

I can get the first part which is the equivalent impedance of 2.05 ohms angle

77.4 degrees.

But the next part the answer should be 425V and 447.2V

But the next part the answer should be 425V and 447.2V

I tried working out the primary which is 100KVA/2.2KV = 45.45 A

hen using the turns ratio Is = 227.25

hence on the secondary side it is 100KVA/227.25 = 440V