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why Transformers power mentioned in KVA?. and why Generators
and Motors power mentioned in KW?.
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Answer Posted / nithi
we can design the transformer for some rated voltage &
rated current ,power factor depends on the load.so,we
cannot predict the p.f. while designing the transformer.
But in the case of generator ,it has to supply real
power (depends on the capacity of the prime mover)& some
amount of reactive power to the system (depends on the
rating of exciter).that's why generators are supplied with
the name plate details including p.f.,kva rating & kw
rating.
in case of motor,it has to take some hp(kw) load
(real power) ,for that it uses some amount of power for
producing the magnetic field (magnetizing power--reactive
power).so,during the design itself we have idea about how
much of load the motor should take (hp load).This is the
reason why the motor is rated in kw,p.f..
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