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What are Impedance Voltage and Load Loss tests?

The voltage required to circulate the rated current under short-circuit conditions when connected on the rated voltage tap, is the impedance voltage. Rated current is circulated through the windings with the secondary short-circuited. The impedance voltage and load loss is measured. They are corrected to rise +20°C reference temperature.

Note: This is a standard test only on units over 500kVA. It will only be carried out on lower kVA units when specifically requested.

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