Reacceleration Protection

Induction motors are capable of developing transient current and torque considerably when they are subjected to momentary loss of power and reclosing on the same power supply. This can occur either during a bus transfer or during a fault-induced interruption. The magnitude of this transient torque could cause considerable damage to the motor or driven equipment. Slow transfer or reclosing can be used for motor protection. A remanent under voltage protection ANSI 27R on busbar (setting <25%Un) will gurantee the voltage drops below a certain value and we don't have harmful reacceleration at the moment of reclosing or bus transfer.