一起线路故障引起主变压器零序过电压动作的分析  

Analysis on Action of Zero Sequence Overvoltage of Main Transformer Caused by Line Fault

作　　者：周洁[1] 吴俊美[1] 

机构地区：[1]德阳电业局变电检修中心,四川德阳618000

出　　处：《四川电力技术》2011年第2期32-33,37,共3页Sichuan Electric Power Technology

摘　　要：结合一起110 kV线路发生接地故障造成所连两变电站全站失压的例子,介绍了故障时的系统运行方式,借助故障录波图和报文分析了保护的动作过程,通过分析零序电压的异常变化得出了造成该变化的原因与接地系数过大及10 kV电压倒送有关。最后,提出了相应的措施来提高系统的稳定性。Combined with an example of ground failure in a 110 kV transmission line which caused the loss-of-voltage in two connected substations,the running mode of the system in that moment is introduced.The process of protecting movements is analyzed by using the wave pictures and messages.The reason for the unusual change of zero sequence voltage is relevant to the overlarge coefficient of grounding and the 10 kV returned voltage.At last,some useful measures are proposed to improve the stability of the system

关 键 词：接地故障 零序过电压 接地系数 

分 类 号：TM726[电气工程—电力系统及自动化]