Electricity: electrical systems and devices – Safety and protection of systems and devices – Feeder protection in distribution networks
Patent
1986-04-08
1987-06-16
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Feeder protection in distribution networks
361 42, 361 69, 361 77, 361 94, H02H 330
Patent
active
046740023
ABSTRACT:
An echo-keyed directional comparison blocking system for protecting an electrical power transmission path in a power system network against internal faults is disclosed. The system includes a terminal unit disposed at each end of the transmission path for measuring characteristics representative of the power at its corresponding end and for activating a corresponding circuit breaker when an internal fault of the transmission path is detected. Each terminal unit includes a transmitter and a receiver for communicating transmit and receive signals with each other through a communication medium and additionally includes at least one forward-looking pilot relay, at least one over-current relay, and a plurality of circuits. The aforementioned combination provides for internal fault preference over an external fault, speeds up tripping of the circuit breakers under the conditions of one relay responding slower to a fault detection than another, eliminates problems which may delay circuit breaker activation caused by electrical noise coupled to the receiver, and improves transient block and unblock responses to fault conditions of the power system network.
REFERENCES:
patent: 4371908 (1983-02-01), Andow et al.
patent: 4470093 (1984-09-01), Yamaura
patent: 4528611 (1985-07-01), Udren
Li Hung J.
McFall John D.
Jennings Derek S.
Pellinen A. D.
Westinghouse Electric Corp.
Zitelli W. E.
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