Unsupervised trip keying for phase comparison relaying apparatus

Details Unsupervised trip keying for phase comparison relaying apparatus Unsupervised trip keying for phase comparison relaying apparatus

1976-08-20

1977-11-08

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 85, H07H 328

Patent

active

040578410

ABSTRACT:
Phase comparison relaying apparatus associated with the local and remote end terminals of a protected line section wherein the phase comparison is performed at one terminal by unsupervised circuitry to generate an echo trip signal which is employed to effect breaker tripping at the other terminal. Additional circuitry supervises the generation of a breaker trip signal for use at the terminal where the echo trip signal is generated without preventing generation and transmission of the echo trip signal.
The use of such circuitry is described in the operating context of phase comparison relaying apparatus adapted to utilize offset keying. Also described is the effectiveness of such circuitry during open breaker or zero-feed conditions.

REFERENCES:
patent: 3832601 (1974-08-01), Hinman, Jr. et al.
patent: 4020396 (1977-04-01), Gambale et al.

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