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 / m.anand

copper loss and iron loss depends only on current and
voltage there is no phase angle involved in between voltage
and current.so powerfactor is not factor affecting
transformer rating ...
hence transformer ratings are in KVA

Answer / jd

Since we don't know the type of load that the transformer would be bearing in future. thus the manufacturer specifies its rating in KVA or MVA

Answer / gopalakrishna

transformer ratting are always in KVA or MVA why because
transformer iron losses are depen upon current, and copper
losses are depending upon voltage hence the rattings of the
trans former rattings are in 'kva'

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