Answer Posted / madhu

Impedance voltage of a transformer is the voltage required

to

short circuit the secondary winding terminals of the
transformer and apply voltage gradually from zero at
primary winding.increase the voltage gradullay till the

full load current flows in the secondary.The voltage at

which full load current flows that voltage is the impedance

voltage of the transformer.This is required for short
circuit calculations.You can find on the transformer name

plate as Impedance voltage or percentage impedance

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