Protective relay system and sampling synchronizing method theref

Details Protective relay system and sampling synchronizing method theref Protective relay system and sampling synchronizing method theref

1982-10-21

1984-09-04

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 66, 340310R, 455 51, H02H 726

Patent

active

044700938

ABSTRACT:
In a protective relay system for an electric power system with relay devices at respective terminals, a synchronous signal is transmitted from each terminal upon occurrence of a fixed time relation with the clock signal subsequent to receipt of a synchronous signal from the opposite terminal. The synchronous signal is associated with time data indicating the relative time of receipt of the synchronous signal with reference to the occurrence of the clock signal. The time deviation of occurrence of the clock signal at each terminal with reference to occurrence of the clock signal at the opposite terminal is detected in accordance with the time data transmitted from the opposite terminal, the time point at which the synchronous signal from the opposite terminal is received, the time point at which the preceding transmission of the synchronous signal toward the opposite terminal took place and the clock signal at each terminal, and is used for phase-adjustment of the clock signal at each terminal.

REFERENCES:
patent: 3849763 (1974-11-01), Greene, Jr.
patent: 4071873 (1978-01-01), Andow et al.
patent: 4228476 (1980-10-01), Okita et al.
patent: 4371908 (1983-02-01), Andow et al.
Article "Development of Superimposition Transmission Device", in a Periodical, OHM '76/5, pp. 81-88, Aoki et al., 1976.

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