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Why Generator & Alternator rated in kVA. Not in kW?

Why Alternator/Generator  Rated in kVA. Not in kW?

The power √3 VL IL Cos φ delivered by the alternator for the same value of current, depends upon p.f. (Power Factor=Cos φ) of the load. But the alternator conductors are calculated for a definite current and the insulation at magnetic system are designed for a definite voltage independent of p.f. (Cos φ) of the load. For this reason apparent power measured in kVA is regarded as the rated power of the alternator.
Why alternator rated in kVA. Not in kW?
Why alternator rated in kVA. Not in kW?

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