Patent
1974-06-11
1976-09-28
Miller, J D
317 29R, H02H 326, H02H 726
Patent
active
039834565
ABSTRACT:
A phase comparison protective relay for a transmission line which comprises a current converter circuit for generating electricity corresponding to the local terminal current; a first device for transmitting a first signal during a period when the instantaneous value of said electricity is positive with respect to a predetermined positive level and for transmitting a second signal during another period; a second device for transmitting a third signal during a period when the instantaneous value of said electricity is positive with respect to a predetermined negative level and for transmitting a fourth signal during another period; a transmitter for transmitting the first and second signals to a remote terminal; a receiver for receiving the first and second signals from the remote terminal; a third device for transmitting a fifth signal when the overlapping period of the third signal and the first signal is longer than a predetermined period; a transmitter for transmitting the fifth signal to the remote terminal; a receiver for receiving the fifth signal from the remote terminal; the third device functioning to transmit the fifth signal when the overlapping period of the third signal and the fifth signal is longer than a predetermined period; and an automatic breaker connected to the transmission line which is opened by the fifth signal transmitted from the local terminal.
REFERENCES:
patent: 3176190 (1965-03-01), Hodges
patent: 3470418 (1969-09-01), Hagberg et al.
patent: 3590324 (1971-06-01), Rockefeller
patent: 3710189 (1973-01-01), Hagberg
patent: 3832601 (1974-08-01), Hinman, Jr. et al.
patent: 3882361 (1975-05-01), Hinman, Jr.
patent: 3893008 (1975-07-01), Strickland, Jr. et al.
patent: 3898531 (1975-08-01), Hinman, Jr.
"Protective Relaying Scheme for 500kV Systems," Mitsubishi Denki Giho, vol. 45, No. 9, 1126-1140 (1971) by Mikami, Kitaura, Furaya, Amano, Suzuki, Takata, Kobayashi.
Miller J D
Mitsubishi Denki & Kabushiki Kaisha
Salce Patrick R.
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