Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1985-11-12
1987-07-07
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 42, 361 93, H02H 708
Patent
active
046791116
ABSTRACT:
A circuit arrangement for monitoring ground faults to a normally ungrounded coil of a motor, the circuit arrangement including;
a source of a low-level d.c. voltage, the source having first and second output terminals between which the d.c. voltage is established and a conductive connection being established between the first output terminal and the motor coil;
a current responsive unit connected between a point at ground potential relative to the motor coil and the second output terminal of the source for producing an output signal proportional to the amplitude of current flow between the second terminal and ground; and
a motor control unit connected for preventing operation of the motor when the output signal from the current responsive means reaches a selected value.
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Einolf, Jr. Charles W.
Koch Karl C.
Abeles Daniel C.
Jennings Derek S.
Pellinen A. D.
Westinghouse Electric Corp.
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