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Answer Posted / 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
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