Answer Posted / ep

Transformer rating comes in KVA not in KW, because - there are two types of transformer losses (Copper losses and Iron losses). Copper loss depends on current and Iron/Core/Insulation losses depends on voltage. Hence, total losses are dependent on amp-volt (VA), not on phase angle between current and voltage. It means losses are independent of load power factor (cos phi).
That's why transformer rating comes in KVA not in KW

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