一起主变及电抗器差动速断保护误动事故的分析  

Analysis of Misoperation Case of Differential Quick-Break Protection for Main Transformer and Reactor

作　　者：毛爱民 MAO Aimin(Zhangjiagang Free Trade Zone Changyuan Thermal Power Co.,Ltd.,Suzhou,Jiangsu 215634,China)

机构地区：[1]张家港保税区长源热电有限公司,江苏苏州215634

出　　处：《东北电力技术》2022年第11期53-57,共5页Northeast Electric Power Technology

摘　　要：差动速断保护作为差动保护的辅助保护,为快速切除区内严重故障提供了保障。电流互感器铁芯饱和致使传变电流波形发生畸变是保护误动的常见原因,结合实际案例,从短路电流大小、TA负载阻抗、互感器传变等方面分析了造成继电保护电流互感器铁芯饱和的影响因素,提出了防止差动速断保护误动的常见有效措施。As an auxiliary protection of differential protection,differential quick break protection provides protection for serious faults in quick cutting area.The distortion of transmission current waveform caused by saturation of current transformer core is the common cause of protection misoperation.Based on practical cases,it analyzes the influencing factors of relay protection current transformer core saturation from the aspects of short circuit current,TA load impedance,transformer transmission and so on.It puts forward common effective measures to prevent differential quick fault protection from misoperation.

关 键 词：差动速断保护 电抗器 大容量高速开关 TA铁芯饱和 

分 类 号：TM47[电气工程—电器]