Why Trasformers rated in KVA
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Answer Posted / loboreliance2003
S(kVA)=P(kW)+jQ(kVAr) where S is total power, P is active
power (Power uses by a resistive load E.g:light, heater,
etc) & Q is reactive power (Power causes by an inductive
load E.g: Induction motor). For a load, we only wants to
know how much work it will do, so information of kW is
enough. However, for a transformer as it has to supply
power to the whole system, it will be affected by both
active & reactive power. So you will have to concern about
the total kVA of your system to choose the correct
transformer. If you only concern about the active power the
transformer can handle and not about the reactive power,
the total power of your system sometimes will be larger
than the total power of the transformer and will damage it.
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