초록 ▼

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 lock

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.

대표청구항 ▼

Reclosing relay apparatus for reclosing a circuit breaker in an electrical power system when the circuit breaker trips in response to a fault in the electrical power system, said apparatus including a reclosing stage with two lockout circuits for reliably preventing circuit breaker pumping, and dete

Reclosing relay apparatus for reclosing a circuit breaker in an electrical power system when the circuit breaker trips in response to a fault in the electrical power system, said apparatus including a reclosing stage with two lockout circuits for reliably preventing circuit breaker pumping, and detector means for determining the trip status and reclosure status of the circuit breaker and for generating a status signal representative thereof, said reclosing stage comprising: reclosing means governed by said status signal for reclosing the circuit breaker after a first predetermined time interval measured from the initiation of a trip status of the circuit breaker as indicated by said status signal; first lockout circuit governed by said status signal for setting a first lockout signal upon reclosure of the circuit breaker as indicated by said status signal to disable said reclosing means from reclosing the circuit breaker; second lockout circuit governed by said status signal for setting a first lockout signal, independent of said first lockout circuit, to redundantly disable said reclosing means from reclosing the circuit breaker, said second lockout circuit comprising: first circuit stage governed by the status signal for generating an intermediate signal upon reclosure of the circuit breaker as indicated by said status signal; and second circuit stage governed by said intermediate signal and the status signal for setting the second lockout signal upon retrip of the circuit breaker as indicated by the combination of the status and intermediate signals; and reset means for resetting said first and second lockout signals after a second predetermined time interval measured from the initiation of said reclosure status of the circuit breaker to enable said reclosing means for reclosing the circuit breaker, said second predetermined time interval being longer than said first predetermined time interval.