Answer Posted / pankaj rajput

The leading/lagging power factor has
magnetizing/demagnetizing effect on armature reaction in a
rotating electrical machine. Hence the losses depends on
the load power factor. Unity PF has neither magnetizing nor
de-magnetizing effect.

Whereas in a transformer, the power factor doesn't play any
role in machine losses i.e. Cu & core losses are
independent of power factor.

Hence the rating of transformer is always given in KVA and
the rating of generators is given in kW at certain pf i.e.
usually at 0.8 lag.

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