Answer / rashid abdul rab

W= voltage*current*power factor
But in practical we are not well aware of the type of load
(power factor)to be applied on transformer. So we give the
ratings in KVA only

Answer / mohamed iqbal

There are 2 losses in transformer. One is copper loss which depends on current and the other is iron loss which depends on voltage. These two factors are not affected by the power factor. This is why transformers are rated in KVA and not KW. Single phase KVA = Amps x Volts/1000. Single phase KW = Amps x Volts x pf/1000. 3 phase KVA = Amps x Volts x 1.73/1000. 3 phase KW = Amps x Volts x 1.73 x pf/1000

Answer / anu

In transformer the copper losses are due to current and
iron losses are due to voltage. so that the rating of T/F
is in KVA instead of KW.

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