Tap Changing Regulator
Tap Changing Regulator : a device that improves the regulation of an AC power source. The regulator is placed between an AC power source and the load to be protected. A tap-changing regulator has a special transformer with multiple outputs or taps. Typically, one of the output taps provides a voltage equal to the input voltage, while other taps provide various voltages which are a few percent higher or lower than the input voltage. An automatic selector switch chooses the tap which provides the voltage closest to the desired output voltage. In operation, if the AC power source were to suddenly decrease in voltage by 5% from nominal and remain at that voltage, then the Tap-Changing Regulator would respond by choosing a transformer tap 5% higher than the input voltage and would supply this corrected voltage to the load. Tap-Changing Regulators are especially useful in situations where a site is experiencing chronically high or low line voltage
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