When the motor is being stopped, the thermal image calculation continues by using the background heat level and cooling down time factor until thermal capacity level decreases to zero. The thermal capacity decreases at a constant rate till it reaches the background heat level, after which it depends on the parameters trip class, and cool down time factor. Thus, simulating cooling down of the stator winding and the iron body of the motor.During power failure, the thermal capacity level of the motor is stored in the memory and the cooling down calculation starts from this level after resumption of power.
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