电流二次回路两点接地造成母线差动保护误动作分析及防范措施  

Analysis and Preventive Measures of Misoperation of Busbar Differential Protection Caused by Two-point Grounding of Current Secondary Circuit

作　　者：冉茂兵 师刘俊 马运亮 RAN Maobing;SHI Liujun;MA Yunliang(XJ Electric Co.,Ltd.,Xuchang 461000,China)

机构地区：[1]许继电气股份有限公司,河南许昌461000

出　　处：《电工技术》2022年第3期62-64,67,共4页Electric Engineering

摘　　要：电流互感器二次回路中有且只能有一点接地,当二次回路被破坏时,会出现多点接地的情况,进而引起保护装置发出告警或动作,破坏电力系统的稳定性。针对新疆某220 kV变电站母线差动保护因电流互感器二次回路两点接地而误动作的案例,分析了故障录波报告及动作过程,提出了相应的防范措施,为变电站运维人员提供一些参考,避免因二次回路故障而引起事故。The secondary circuit of current transformer has and can only have one point of grounding.When the secondary circuit is destroyed,the multi-point grounding will occur,which will cause the alarm or action of the protection device and destroy the stability of the power system.A case of misoperation of busbar differential protection caused by two-point grounding of secondary circuit of current transformer in a 220 kV substation in Xinjiang is analyzed.The fault recording report and operation process are discussed in detail.Some corresponding preventive measures are put forward for the misoperation of protective devices caused by the two-point grounding of the secondary circuit,and some references are provided for the operation and maintenance personnel of substations,so as to avoid accidents caused by the fault of the secondary circuit.

关 键 词：母线差动保护 二次回路 两点接地 预防措施 

分 类 号：TM774[电气工程—电力系统及自动化]