Loss-of-potential supervision for a distance relay

Details Loss-of-potential supervision for a distance relay Loss-of-potential supervision for a distance relay

H - Electricity

02

H

348/28

H02H 7/26 (2006.01) H02H 3/05 (2006.01) H02H 3/40 (2006.01)

Patent

CA 1320561

ABSTRACT OF THE DISCLOSURE Loss-of-potential supervision for a distance relay controlling a circuit breaker in a poly-phase electric power transmission system is provided by blocking circuit breaker trip signals in the presence of a low voltage condition and the absence of an increase in current of more than a predetermined amount. Overblocking is prevented for weak feed conditions, a circuit breaker closing on a fault, transients induced by replacement of a fuse, and sequencing caused by tripping of a remote breaker.

595685

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