Three-phase power transmission line phase-to-ground fault respon

Details Three-phase power transmission line phase-to-ground fault respon Three-phase power transmission line phase-to-ground fault respon

1982-08-06

1984-04-03

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 92, H02H 316

Patent

active

044411359

ABSTRACT:
A three-phase power transmission line phase-to-ground fault responder wherein voltage coils of respective responder relays are energized by respective phase-related voltages and wherein current coils of such relays are serially connected across the composite voltage source comprising the three serially composite voltage source comprising the respective phase-related voltages applied in series. In one embodiment the phase-related voltages are proportional to the transmission line phase voltage itself whereas in a second embodiment, less sensitive to location of fault in relation to the instrument takeoff voltage location, the phase-related voltage is the vector sum of voltages of the other two phases.

REFERENCES:
patent: 1749531 (1930-03-01), Goldsborough
patent: 1937166 (1933-11-01), Pittman
patent: 3209204 (1965-09-01), Rockefeller, Jr.

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