Answer Posted / shantanau mishra

This is the voltage required to drive full load current in a
winding of a transformer when the other winding is short
circuited.
for example if percentage impedance of a 33/11kv transformer
is 6%. it means that 33x6/100=1.98KV would be required to
drive full load current in 33kv winding when 11kv winding is
short circuited.

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