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

1984-08-10

1986-09-16

Pellinen, A. D.

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

046125949

ABSTRACT:
In a protective relay system for an electric power system having two terminals at which electrical quantity is sampled in synchronism with a clock signal produced at each terminal, and the sampled electrical quantity data are exchanged for protection at said opposite terminal: a synchronous signal is transmitted from each terminal toward the opposite terminal; time data T1 is transmitted from a first terminal SS2 toward a second terminal SS1, the time data T1 indicating a time point t.sub.1 of the transmission of the synchronous signal toward the second terminal SS1 with reference to the clock signal; the time data T0 is transmitted from the second terminal SS1 toward the first terminal SS2, subsequent to reception of the synchronous signal from the first terminal SS2, the time data T0 indicating a value

REFERENCES:
patent: 3849763 (1974-12-01), Greene, Jr.
patent: 4071873 (1978-01-01), Andow et al.
patent: 4183072 (1980-01-01), Takagi et al.
patent: 4228476 (1980-10-01), Okita et al.
patent: 4322768 (1982-03-01), Maeda et al.
patent: 4371908 (1983-02-01), Andow et al.
patent: 4470093 (1984-09-01), Yamaura
"Signal Synchronish System" abstract of patent abstract of Japan, vol. 3, No. 132.

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