Offset keying technique for segregated phase comparison relaying

Details Offset keying technique for segregated phase comparison relaying Offset keying technique for segregated phase comparison relaying

1975-02-07

1976-10-12

Miller, J D

317 28R, 317 29R, 317 47, H02H 726, H02H 328

Patent

active

039860795

ABSTRACT:
A phase comparison relaying network wherein a transmitter keying threshold is set at a predetermined value of the current wave at the transmitter end which is offset from the effective zero axis of the current wave. This yields a signal which, when phase compared with the current wave at the receiver end of the protected line section, permits a tripping response in the presence of "outfeed" current at the "weak feed" end of the protected line section which might occur during an internal fault.

REFERENCES:
patent: 3176190 (1965-03-01), Hodges
patent: 3295019 (1966-12-01), Altfather
patent: 3470418 (1969-09-01), Hagberg et al.
patent: 3590324 (1971-06-01), Rockefeller
patent: 3612952 (1971-10-01), Hagberg
patent: 3710189 (1973-01-01), Hagberg
patent: 3882361 (1975-05-01), Hinman
patent: 3893008 (1975-07-01), Strickland, Jr. et al.
"Mitsubishi Denki Giho," by Mikami et al., pp. 1126-1140 of vol. 45, No. 9, (1971).

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