Apparatus for monitoring motor winding leakage

Details Apparatus for monitoring motor winding leakage Apparatus for monitoring motor winding leakage

1986-05-05

1987-12-29

Envall, Jr., Roy N.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

318490, H02H 316

Patent

active

047164875

ABSTRACT:
A system for automatically monitoring the insulation leakage resistance of an electric motor for a short period prior to operation thereof having timing means for delaying application of the motor control voltage to the motor and for applying a high voltage direct current to the windings of the motor during such period. A sense resistor is connected between the motor frame and the high voltage supply ground, and the leakage current therethrough is monitored by a comparator. When the leakage current exceeds a preselected threshold, an alarm is initiated and operation of the motor is inhibited.

REFERENCES:
patent: 3764855 (1973-10-01), Beachley
patent: 3947759 (1976-03-01), Briggs
patent: 4011483 (1977-03-01), Meadows
patent: 4133017 (1979-01-01), Johnson et al.
patent: 4159501 (1979-06-01), White
patent: 4540922 (1985-10-01), Horvath et al.

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