Circuit breaker failure relay system for power transmission line

Details Circuit breaker failure relay system for power transmission line Circuit breaker failure relay system for power transmission line

1991-05-13

1992-10-20

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 62, 361 65, 361 94, H02H 300

Patent

active

051575752

ABSTRACT:
A breaker failure relay circuit is responsive to either a trip signal from a protective relay or a manual trip signal, as well as the current through a circuit breaker protecting a transmission line. The trip signal is applied to an edge triggered timer (28) having selected pickup and dropout times, and is also applied as one input to one OR gate (24). The circuit breaker current is applied to an overcurrent element (34), the output of which is applied to a reset input of the edge triggered timer (28) to reset and disable the timer and also as one input to another OR gate (30). The other input to OR gate (30) is the output of the edge triggered timer (28). The outputs of OR gates (24, 30) are applied to an AND gate (26), the output of which is applied to a second timer (32) and as another input to the one OR gate (24). The output of the timer (32), if and when it occurs, is used as a trip signal for a backup circuit breaker.

REFERENCES:
patent: 4237512 (1980-12-01), Forford
patent: 4896254 (1990-01-01), Bennett
patent: 4967304 (1990-10-01), Dougherty
Hinman, Walt; Westinghouse Electric Corporation; "Applied Relaying"; 1982.
"Summary Update of Practices on Breaker Failure Protection"; IEEE Transactions on Power Apparatus and Systems, vol. PAS-101, No. 3, Mar. 1982.

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