Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1977-04-22
1979-02-06
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
239177, 361104, H02H 904
Patent
active
041387058
ABSTRACT:
A safety device and method for detecting over-power conditions on the chassis of a motor driven system interrupts energization of the system when the voltage differential between the system chassis and earth ground exceeds a selected value. The device is especially beneficial for systems utilizing multi-phase induction motors in which current sensing safety devices cannot effectively detect all over-power conditions. The safety device utilizes a fuse and a motor control relay such that, upon the occurrence of the over-power condition, the fuse is rendered non-conductive, opening the motor control relay.
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Lockwood Corporation
Moose Jr. Harry E.
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