一起自切闭锁母差隐性缺陷导致故障扩大的事故分析  

Analysis of a Blackout Escalation Caused by Hidden Failure Lying in Blocking Logic Between Auto-switching Protection and Bus Differential Protection

作　　者：游家训[1] 吴蓉[1] 叶康[1] 柏强[1] 荣吉良[1] 郭创新[2] 

机构地区：[1]上海市电力公司超高压输变电公司,上海市200063 [2]浙江大学电气工程学院,浙江省杭州市310027

出　　处：《电力系统自动化》2011年第7期102-107,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50677062);国家高技术研究发展计划(863计划)资助项目(2008AA05Z210);浙江省自然科学基金资助项目(R107062)~~

摘　　要：介绍了2009年华东电网一起事故的发生及演化过程,并根据事故发展的3个阶段,分别对相关的设备状况及保护信息进行了分析。分析表明,该事故属于比较少见的复杂故障,但该站的35kV母联自切保护不合理地闭锁母差导致了事故的扩大。文中根据母联自切及母差保护原理,论述了母联自切与母差保护之间的相互闭锁关系,指出该设计存在隐性缺陷。最后总结了教训,提出了预防类似事故的建议。A blackout occurred in East China power grid in 2009 and its evolution process are introduced.In accordance with three stages of failure development,status of equipment concerned and protection information are analyzed respectively.Analysis shows that the fault is a rare and complex one,but improper blocking between 35 kV bus coupler auto-switching（BCAS） and bus differential protection（BDP） is a contribution factor to escalation of the fault.Based on dissection of the BCAS protection and BDP principles in this substation,the mutual blocking relationship between these two protections is analyzed,and hidden failures in the design is pointed out.Eventually,the advices and precaution measures are presented.

关 键 词：母联自切保护 母差保护 保护闭锁 隐性缺陷 复杂故障 

分 类 号：TM762[电气工程—电力系统及自动化]