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Impedance Voltage
3

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

RE: Impedance Voltage

The percent of the rated voltage used during the short circuit test which causes the full load current to circulate is equal to the percent impedance.

RE: Impedance Voltage

2

You have the gist of it.  See IEEE C57.12.90 if you need a formal reference.
  

RE: Impedance Voltage

Impedance voltage (in p.u.) is the voltage required to overcome the transformer impedance and cause rated current to flow.

ImpedanceVoltage (in p.u.) =  (RatedCurrent * Z)/RatedVoltage

thus,

Z (ohms) = (RatedVoltage * ImpedanceVoltage)/RatedCurrent

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