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Alternator |
Why alternator 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.
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