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Why Transformer in KVA?
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Answer Posted / omnarayan tiwari
kVA is the unit for apparent power. Apparent power consists
of active and reactive power. Active power is the share of
the apparent power which transmits energy from the source
(generator) to the user. Reactive power is the share of the
apparent power which represents a useless oscillation of
energy from the source to the user and back again. It
occurs when on account of some inertia in the system there
is a phase shift between voltage and current. This means
that the current does not change polarity synchronous with
the voltage. But the heat generated in a winding as well as
the eddy current losses generated in a transformer core
depend on the current only regardless of whether it aligns
with the voltage or not. Therefore the heat is always
proportional to the square of the current amplitude
irrespective of the phase angle (the shift between voltage
and current). So a transformer has to be rated (and
selected) by apparent power.
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