Under What Conditions Will the Line Circuit Breaker Auto-Reclosing Signal Be Locked Out?

The line circuit breaker auto-reclosing signal will be locked out if any of the following conditions occur:

(1) Low SF6 gas pressure in circuit breaker chamber at 0.5MPa

(2) Insufficient energy storage in circuit breaker operating mechanism or low oil pressure at 30MPa

(3) Busbar protection operation

(4) Circuit breaker failure protection operation

(5) Line distance protection zone II or zone III operation

(6) Short lead protection operation of circuit breaker

(7) Presence of remote tripping signal

(8) Manual opening of circuit breaker

(9) Interphase distance protection operation signal under single-pole reclosing mode

(10) Manual closing onto a faulty line

(11) Three-phase tripping occurring under single-pole reclosing mode

(12) After reclosing onto a permanent fault followed by another tripping