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Why Transformer is rated in KVA instead of KW ?

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Question added by Kausar Hossain , Manager (Technical) , Bengal Telecommunication & Electric Corp.(Pvt.) Ltd.(BETELCO)
Date Posted: 2014/04/20
Adnan Ahmad
by Adnan Ahmad , Senior Electrical Engineer , Engro Polymer and Chemicals ( Petrochemical Plant)

There are two type of losses in a transformer;1. Copper Losses2. Iron Losses or Core Losses or  Insulation LossesCopper losses ( I²R)depends on Current which passing through transformer winding while Iron Losses or Core Losses or  Insulation Losses depends on Voltage.That’s why the Transformer Rating may be expressed in kVA,Not in kW.

Gideon lenin
by Gideon lenin , Electrical Engineer , own business

Copper loss of the transformer depends on current and iron loss on voltage, hence total transformer loss depends on volt ampere (VA) and not on single phase between voltage and current

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