Answer / arvind arora

ratings are depand upon heating.in transformer heating is
due to coreloss whitch is depands on voltage and copper
loss whitch is depands on currrent.losses do not depands on
pf. for example a x'mer working on rated voltage and rated
current with load pf equals to zero has rated losses and
rated kva output.so thats why its rating is in kva.

Answer / siva

due losses are in kva

Answer / william lobo

All transformers are rated in KVA or MVA if they are big
size. This is because it has a particular capacity and we
cannot utilise beyond this capacity. suppose you have
100KVA transformer; then you cannot use more than 100kva
capacity. If you do either transformer will burnt out or
the circuit breaker will trip.

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