取消低压断路器欠压(失压)脱扣功能的危害及对策

Damage brought by canceling the under-voltage (no-voltage) release of low-voltage breaker and its solutions

分析了配电网用户取消(闭锁)低压断路器欠压(失压)脱扣功能的原因,讨论了在取消低压断路器欠压(失压)脱扣功能的情况下,电网失压后恢复供电及电网欠压运行将带来的危害,并针对因电网瞬时波动、闪变、断电等导致低压断路器欠压(失压)脱扣跳闸引起用户突然断电,以及供电部门恢复供电时手动合闸工作量大、速度慢等情况,提出了低压断路器宜采用延时欠压脱扣器及失压脱扣重合闸控制器的解决方案,从而使低压断路器欠压(失压)脱扣功能更好地发挥作用。

This paper analyzes the reason why some customers of power distribution network cancel the under-voltage （no-voltage） release of low-voltage breaker. Also, it discusses the damage brought by the power supply recovering and the under-voltage operation of power network, under the circumstance of canceling the under-voltage （no-voltage） release of low-voltage circuit breaker. Power network instantly fluctuating, flickering, supply interrupting may cause low-voltage breaker under-voltage （no-voltage） releasing and leads to customers＇ electricity failure. It is heavy human forces and much time needed, that the power supply department manually switches the breakers on when power supply recovering. Aiming at above two situations, the paper puts forward two solutions that low-voltage breaker should use delay under-voltage releaser and reclosing controller of no-voltage release in order that the under-voltage release can function much better.