暂态不平衡电流引起的发电机差动保护误动分析  

Analysis of maloperation of generator differential protection caused by transient unbalanced current

作　　者：谌争鸣 

机构地区：[1]江西省电力科学研究院,江西南昌330006

出　　处：《继电器》2008年第10期86-88,共3页Relay

摘　　要：通过对CT和二次回路的试验数据进行暂态计算分析,找出了发电机差动保护误动原因。由于发电机差动保护两侧CT励磁特性和二次回路存在差异,区外故障切除后,电流非周期分量在衰减过程中将产生差动电流。若超过动作值,则会引起发电机差动保护误动。The cause of generator differential protection maloperation is found out through calculating and analyzing transient process with the test data of current transformer and secondary circuit. Because there is difference between excitation characteristic and secondary circuit of both side current transformer used generator differential protection, there is differencial current during decay of current non-periodic component after cutting off external fault. If differential current exceeds operation value, generator differential protection will maloperate.

关 键 词：发电机 差动保护 CT特性 暂态不平衡电流 误动 分析 

分 类 号：TM772[电气工程—电力系统及自动化]