线路断路器失灵保护几个问题的探讨

对启动常规的线路断路器失灵保护的相电流元件存在为保证在线路末端故障时有足够的灵敏度而不能躲负荷电流的问题，提出整定值随正常负荷电流变化、并在母联断开前后使用不同定值的方案，针对在500kV线路上由于断路器分闸时间过长，而失灵保护瞬动闭锁重合闸，从而不能发挥重合闸的功能的问题，探讨了瞬动不闭锁重合闸的方案、针对线路断路器失灵保护使用一套电压闭锁的定值，而在线路末端和首端分别发生故障时灵敏度相差太大，甚至不能使用电压闭锁元件的问题，进行了分析，并提出了不同保护单元启动失灵保护使用不同定值、母联断开前后使用不同定值的方案。

Research on several questions of line circuit breaker failure protection

This paper analyzes several questions about line circuit breaker failure protection and gives corresponding solutions.phase current elements can not avoid load current in order to assure sufficient sensitivities at the terminals when the routine line circuit breaker failure protection was started.The measures have been suggested that setting values changed as natural load current changed and different values were used before bus gangs switched off.Because the breaker opened too long and the failure protecti...