Answer / pradyumna171

Transformer gives apparent power,it is the supply power to load and the power actually used by the load is the real power/true power/active power. Apparent power of 100 KVA has capacity to give 100 KW resistive load and for inductive load of o.8 pf it give 80 KW,and at 0.7 pf the same has capacity to give 70 KW . but the manufacturing company does not know which type of load to be connected across the transformer,therefore in simple we can say " DUE TO UNKNOWN POWER FACTOR THE TRANSFORMER ARE RATED IN KVA" and it is meaning less discuss about Iron loss & copper loss because the Inverted and UPS are rated in KVA but there is no iron loss & copper loss And in other hand in DC Generator there is Iron loss &copper loss but it is rated in KW not in KVA, because there is no angle between current and voltage(pf) in DC supply N.B transformer capacity -transformer iron loss & copper loss = transformer efficiency in KVA
PRADYUMNA CHANDRS PANDA
Mob No. 9437917849

Answer / santosh bangar

rating of any electrical equipment its depends on how much heating ( by losses) is permissible.

in Transformer , rated output limited by heating and hence by the losses in the transformer

two types of losses in transformer Copper loss( proportional to I) and core loss proportional to V)

we have constant power VI in transformer
if we increase Voltage then current will reduce
and if we increase current then voltage will reduce

we can not go beyond certain limit of voltage ... limited by core loss
and also can not go beyond certain limit of Current..limited by copper loss

means we know what is max voltage and max current and VI is rating of transformer

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