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

1988-04-05

1989-05-30

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Series connected sections with faulty section disconnect

361 79, H02H 726

Patent

active

048356514

ABSTRACT:
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.

REFERENCES:
patent: 3777215 (1973-12-01), D'Esopo
patent: 4479084 (1984-10-01), Ogawa et al.
patent: 4745512 (1988-05-01), Hampson

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