Answer / k.prakashchandra

Percentage impedance is only a percentage as it is
percentage of I x Z / V and the unit of I x Z is V. V/V is 1

Answer / euclid

Transformer impedance is a ratio
of the transformer’s normal full load current
to the current available under short circuit condition.It was stamped on every transformer nameplate. Why did they stamped it because it is a tested value after the transformer has been manufactured.

Answer / afsal

Percentage impedance is the ratio of voltage drop on full load due to winding resistance and leakage reactance to the rated voltage of the transformer.
Z%= Vd/Vr *100

this can varied at the design stage by varying voltage per turns and geometrical size of the windings.

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