The machines which consumed power are rated in KW. But the main work of transformer is to transmit the power and not to consume the power, it is rated in VA and not in KW.
Understand the difference between the KVA and KW.
The KVA is the product of the KV and Ampere,
kVA = kV * A
The KW is the product of KV, Ampere and power factor,
kW = kV * A * pf
Power factor is the only terms which make the difference between the two.
What is power factor?
The power factor simply shows the total power consumes by the load. i.e., The machines which are rated in KW are designed for the fixed type of load. Like inductive load are always connected to the induction machines.
But in case of the transformer, the load is completely unpredictable, and the designer designed the transformer by considering the unity power factor. Thereby, the rating of the transformer is in KVA and not in KW.
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