Reduction in Supply Voltage

Induction Motor Protection (Part4)
Abnormal Operating Conditions from Supply Side (Part3)
       The torque developed by an induction motor is proportional to the square of the applied voltage, therefore, any small reduction in voltage has a marked effect on the developed torque. The reduced torque may cause the motors to lose speed and draw more current.
       Large motors should be disconnected when a severe low voltage condition persists for more than a few seconds.
       Under-voltage relays may be used for protection against reduced supply voltage.

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