Answer / rahul

copper loss depends on current andiron loss depends upon
voltage.hence the total loss in a transformer depends upon
volt-ampere(va) so rating of transformer is given in VA

Answer / murali290

For any device the rating is given based on the losses occur
in it (loss is nothing but heat).In transformer 2 types of
losses occur 1.core losses: which depends on V &
2.cu losses: which depends on I only
but no losses depends on p.f.
therefore trasformer rating proportional to VI or VA
for large transformers the rating in kilo or mega ,hence
KVA or MVA

Answer / praha tuty

Transformer has copper loss & iron loss. copper loss occur
in windings & it is due to emf.Iron loss occur in core due
to current. so in order to measure the both losses,
transformer ratings are in VA rating.

Answer / rakesh maharjan

The KW rating is dependent on the power factor and power factor can be different depending the condition where as mostly 0.8, but if KVA rating is given we can calculate the KW rating as per our condition. So KVA rating is fixed and reliable to any malfunciton not to occur. so the transformer rating is given in KVA.

Answer / pramod attri

it's using step up, and step down at same frequency..by
mutual inductance.. it case transformer calling in kv,,,

Answer / rajeshambur

transformer have a two losses because open circut and short circut . two losses so transformer rating in va

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