Richard A Hamel

US Patent:

46046747, Aug 5, 1986

Filed:

Mar 13, 1985

Appl. No.:

6/712315

Inventors:

Richard G. Hamel - Margate FL

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

H02H 306
H02H 307

US Classification:

361 73

Abstract:

A reclosing relay for reclosing a circuit breaker in an electrical power system. The reclosing relay is a multi-shot reclosing relay (i. e. , providing more than one reclosure command to the circuit breaker) and includes primary and redundant lockout circuits for each reclose circuit. The primary lockout scheme employs a flip-flop, with a reset timer for resetting if the breaker remains closed after the first reclosure. The flip-flop is set when the circuit breaker recloses to lockout the first reclosure circuit. The redundant lockout circuit locks out the first reclosure circuit after a trip, reclose, and retrip sequence. The second reclose circuit includes similar primary and redundant lockout circuits.