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(Voltage regulation of transformer):
Voltage regulation of transformer is defined as the percentage change in the transformer secondary voltage from no load to full load. In other words, the transformer voltage regulation describes the ability of the transformer to provide the constant voltage from no load to full load.
When current flows through the transformer the voltage drop takes place due to reactance and resistance of the transformer. The variation in the secondary output voltage of the transformer from its no load to full load is called the voltage regulation of the transformer.
The voltage regulation of the transformer shows how well a transformer maintains constant secondary output voltage from no load to full load condition when the primary voltage is constant. V no load is the no load voltage and V full voltage is full load voltage. The secondary output voltage decrease as the current flowing through the transformer is increased. This happens because of the voltage drop in the transformer winding. The secondary output voltage at full load is always less the the output voltage at no load. The lesser the voltage difference of no load to full load condition, the better the regulation of the transformer.