Unsupervised trip keying for phase comparison relaying...

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

H - Electricity

02

H

348/25

H02H 3/033 (2006.01) H02H 3/30 (2006.01)

Patent

CA 1085952

ABSTRACT OF THE DISCLOSURE 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 gene- ration of a breaker trip signal for use et 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.

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