DEVICE TO MONITOR RESISTANCE OF INSULATION AND DRY WINDINGS OF ELECTRIC MOTOR Russian patent published in 2012 - IPC H02K15/12 H02K15/00 

FIELD: electricity.

SUBSTANCE: additional electromagnetic actuator connects windings of an electric motor when resistance to leakage currents drops below the specified level to the specified capacitors and disconnects them after achievement of the required level of resistance. The circuit from V, R, VD is required to indicate drying, a SB1 button makes it possible to forcedly inspect resistance of insulation, and when its value is low, drying of windings is started.

EFFECT: increased resource of an electric motor and reduction of its outage time due to provision of insulation resistance monitoring and timely drying of electric motor windings due to using of a differential transformer of zero sequence current in a proposed device, made with additional coils to increase sensitivity during registration of leakage currents in process of drying, and also an amplifier, an additional electromagnetic actuator and capacitors.

1 dwg