断路器闭锁分合闸的处理方法研究和实例分析

Case analysis and study on treatment of open-close blocked breaker

断路器闭锁分合闸是调度运行中会遇到的一类重大缺陷。该缺陷若不及时处理,在电网发生故障时可能扩大停电范围,甚至造成系统运行失稳风险。首先对断路器闭锁分合闸前后的系统运行极限进行了对比分析,表明断路器闭锁分合闸后电网已进入紧急状态,需对相关断面进行潮流控制。然后对一些典型接线方式下断路器闭锁分合闸的如何处理进行讨论,提出在不能带电处理情况下,典型接线方式下隔离处理闭锁断路器的方法。最后对断路器隔离处理期间的风险进行了分析,提出相关防控要求,避免处理过程中再发生N-1故障导致局部电网解列或系统失稳。

The open-close block of breaker is one of the serious defects in power dispatching. It may expand the range of outage and even cause power system instability after fault if not be treated in time. Analysis on system sending limitation before and after the open-close blocked of breaker is proposed to prove power grid has been operated into the state of emergency and power flow of the corresponding transmission section should be limited. Discussion on treatment of open-close blocked breaker in typical connection modes without outage of equipment is presented. Finally, risk analysis during the isolation of breaker is proposed and the corresponding prevention and control requirements are introduced to avoid local grid islanding or system instability after N-1 fault during defect treatment.