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IEVref:421-05-03ID:
Language:enStatus: Standard
Term: tapping factor
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Definition: the ratio Ud/ UN (tapping factor) or 100 Ud/ UN (tapping factor expressed as a percentage)

where:

UN is the rated voltage of the winding
Ud is the voltage which would be developed at no-load at the terminals of the winding, connected on the tapping concerned, by applying rated voltage to an untapped winding

NOTE – The tapping factor expresses the relative value of the "effective number of turns" of the tapped winding at the relevant tapping, the basis 1 being the effective number of turns of this winding at the principal tapping.


Publication date:1990-10
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