Answer Posted / muzahir hussain

KVA is the unit of apparent power. Apparent power consists of active and reactive power.Active power is the share of the apparent power which transmit energy from source(generator) to user. Reactive is the share of the apparent power which represent a useless oscillation of energy from the source to the user and back again or it used to transfer the power inside the core. So we have to calculate both active and reactive power. therefore we calculate apparent power and the unit of apparent power is KVA.
In shortly we can say that the losses of transformer depends on voltage and current i.e cu loss depends on current(amp) and the iron loss depends on voltage(volts)and k is capacity. So rated in KVA not in KW because it does not depends on power factor.I hope that it is correct up to my knowledge only.

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