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IEVref:421-07-01ID:
Language:enStatus: Standard
Term: impedance voltage at rated current (for the principal tapping)
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Definition: a) of two-winding transformers:
the voltage required to be applied at rated frequency to the line terminals of a winding of a polyphase transformer, or to the terminals of a winding of a single-phase transformer, to cause the rated current to flow through these terminals when the terminals of the other winding are short-circuited

NOTE – The value is normally related to the appropriate reference temperature.

b) of multi-winding transformers, related to a certain pair of windings:
the voltage required to be applied at rated frequency to the line terminals of one of the windings of a pair for a polyphase transformer, or to the terminals of such a winding for a single-phase transformer, to cause a current to flow through these terminals corresponding to the smaller of the rated power values of both windings of that pair, the terminals of the other winding of the pair being short-circuited and the remaining winding(s) being open-circuited

NOTE 1 – The various values for the different pairs are normally related to the appropriate reference temperature.

NOTE 2 – The impedance voltage at rated current is usually expressed as a percentage of the rated voltage of the winding to which the voltage is applied.


Publication date:1990-10
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