断线故障对零序过流保护的影响及保护新方法  

Impact of open-circuit fault on zero-sequence over-current protection and improved protection scheme

作　　者：刘亚东[1] 孙集伟 杨国生[1] 周泽昕[1] 郭艳凤[3] 牛艳利[3] 

机构地区：[1]中国电力科学研究院,北京100192 [2]华北电力调度控制中心,北京100053 [3]国网北京市电力公司,北京100031

出　　处：《电力自动化设备》2017年第7期130-134,141,共6页Electric Power Automation Equipment

摘　　要：在电网运行中发现,线路断线故障有可能会引起相邻线路零序过流保护的误动,特别是重负荷下的多回线路,断线故障后引起的同断面相邻线路零序过流末段保护同时误动会加剧事故扩大。通过理论和仿真分析,研究了重载线路发生断线故障的故障特性,及其对零序过流保护的影响,提出了适应线路断线故障的零序过流保护新方案,并通过实际保护装置的RTDS试验验证其有效性。In grid operation,it is found that the open-circuit fault may cause the zero-sequence over-current protections of adjacent transmission lines to function improperly,especially the multi-circuit transmission line with heavy load. The simultaneous misoperation of the zero-sequence over-current end-zone protections for the adjacent transmission lines in the same cross section may seriously expand the incident. The open-circuit fault of heavily-loaded transmission line and its effect on the zero-sequence over-current protection are studied by theoretical analysis and simulation,an improved protection scheme suitable for the open-circuit fault of transmission line is proposed,and its effectiveness is verified by the RTDS test for a real protection device.

关 键 词：继电保护 零序过流保护 重载 断线故障 故障特性 

分 类 号：TM772[电气工程—电力系统及自动化]