Electricity: electrical systems and devices – Safety and protection of systems and devices – Series connected sections with faulty section disconnect
Patent
1984-07-20
1986-10-28
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Series connected sections with faulty section disconnect
361 64, 174 40R, H02H 726
Patent
active
046202579
ABSTRACT:
In a carrier relay system in which protective relay apparatus are disposed in terminal stations respectively and interchange information between the terminal stations via a signal transmission line for detecting a trouble occurred in power transmission lines on the basis of the exchanged information, specific information K is inserted in a predetermined position of a signal transmitted from the first terminal station to the second terminal station, and the specific information K is inserted intact in another predetermined position of a signal returned from the terminal station to the terminal station. In the terminal station, the specific information K inserted in the signal transmitted therefrom is compared with the specific information K inserted in the signal returned from the terminal station for deciding the presence or absence of a trouble occurred in the power transmission lines. The signal transmission line extending between the terminal stations includes two transmission channels, and circuit breakers are tripped when a fault has occurred in one or both of the signal transmission channels and a trouble detection relay has operated.
REFERENCES:
patent: 4234901 (1980-11-01), Strickland, Jr.
patent: 4359598 (1982-11-01), Dey et al.
patent: 4371908 (1983-02-01), Andow et al.
"Current Differential Type Protective System for Optical PCM Transmission"-General Meeting IEE of Japan, 1983, No. 1218.
Digital Differential Relaying System for Transmission Line Primary Protection Using Travelling Wave Theory-It Theory and Field Experience"-Takagi et al-Conference-IEEE 1979 Power Engineering Society Winter Meeting, New York, Feb. 4-9, 1979.
Iwatani Fumio
Kubo Takao
Miki Yoshiteru
Sano Yoshihiro
Hitachi , Ltd.
Pellinen A. D.
Wysocki A. Jonathan
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