Motor winding leakage monitor

Details Motor winding leakage monitor Motor winding leakage monitor

1984-09-17

1985-09-10

Shoop, Jr., William M.

Electricity: motive power systems

With signals, meters, recorders or testing devices

324 54, 340647, 340648, G01R 2718, G08B 2100

Patent

active

045409226

ABSTRACT:
A low voltage power supply powers a high impedance, high voltage dc supply. An electronic switch serves to automatically connect the high voltage output to the windings of a motor when the motor is non-operating. A lead connects from the frame of the motor to a sense resistor connected to the high voltage system ground. A plurality of variable threshold comparators is connected across the sense resistor. Leakage of the motor windings insulation results in a current flow through the sense resistor producing a voltage drop proportional to the leakage. Each comparator is adjustable to produce an indication of a value of leakage resistance at which the comparator produces an output.

REFERENCES:
patent: 3746979 (1973-07-01), Kildishev et al.
patent: 4159501 (1979-06-01), White

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