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Why the transformers are rated in kva?
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Answer Posted / s s nanal
Transformer is AC Static Inductive M/c where there are no
moving parts.Hence frictional losses are nil.In AC M/cs
power factor i.e.cosine of angle between voltage & current
is important.The relation between KVA & KW is given by
following formula. KVA = KW /P.F. or KW = KVA X P.F. This
angle between Voltage & current decides actual power
available.Transformer being highly inductive m/c power
factor is never = 1.Hence actual KW available is always
less than KVA. Hence X'mers are rated in KVA.
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