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Why transformer rating say in KVA not in KW?

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Question added by Abdul Salim Pulikkalakath , Material Engineer , Pilog Saudi International
Date Posted: 2016/10/20
Muhammad Usman
by Muhammad Usman , Assistant Manager Operations , Lahore Electric Supply Company

Because in transformer, there are two types of losses 1) Copper losses 2) Core losses/Iron losses

Copper losses depend upon current and given by (I^2)*R and Core losses depend upon voltage. Hence, transformer rating is in KVA not in KW.

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