Impedance Voltage
Impedance Voltage
(OP)
If a transformer test report, etc. references an "impedance voltage" in "%", then are they really giving you the impedance? [My understanding is that the impedance voltage is the voltage used during the short circuit test which causes the full load current to circulate; and that the impedance is then calculated via the ratio of this value and the "rated voltage".]
thx,
- john
thx,
- john






RE: Impedance Voltage
RE: Impedance Voltage
You have the gist of it. See IEEE C57.12.90 if you need a formal reference.
RE: Impedance Voltage
ImpedanceVoltage (in p.u.) = (RatedCurrent * Z)/RatedVoltage
thus,
Z (ohms) = (RatedVoltage * ImpedanceVoltage)/RatedCurrent