Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1977-12-01
1979-02-06
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 47, H02H 706
Patent
active
041387066
ABSTRACT:
To detect system ground faults in a dual Y-connected output winding group polyphase alternator to direct current power supply system having direct current output circuitry isolated from a selected point of reference or ground potential, an electrical potential is applied across a selected point of reference or a ground potential and the alternator output winding group neutrals. A system ground fault completes a circuit through which this potential energizes the operating coil of an electrical relay having a pair of normally closed contacts connected in series in the alternator exciting field winding energizing circuit to effect the interruption of the alternator exciting field winding energizing circuit. To detect single phase operation faults, an auxiliary polyphase full-wave rectifier circuit is provided for each of the two alternator output winding groups. A single phase operation fault results in the completion of an electrical circuit including the auxiliary rectifier circuits for effecting the interruption of the alternator exciting field winding energizing circuit.
REFERENCES:
patent: 3496414 (1970-02-01), Logston, Jr.
Johnson Lauren L.
Wilson Robert J.
General Motors Corporation
Moose Jr. Harry E.
Stahr R. G.
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