小电流接地选线装置误动作原因分析及整改措施  

Cause Analysis and Corrective Measures of a Small Current Grounding Line Selection Device

作　　者：贺中华 HE Zhonghua(Shizuishan Jingyuntong New Energy Co.,Ltd.,Shizuishan 753600,China)

机构地区：[1]石嘴山市京运通新能源有限公司

出　　处：《电工技术》2020年第3期114-115,118,共3页Electric Engineering

摘　　要：分析了一起小电流接地选线装置误动作事故,通过检查确定事故原因为此选线装置动作时不具备方向判别功能,只选择5次谐波零序电流最大的。通过技改为中性点经小电阻接地,利用保护装置的零序电流保护实现单相接地跳闸功能,避免了此类问题的再次发生。A misoperation accident of a small current grounding line selection device was analyzed.Through inspection and analysis,it is determined that the cause of the accident was that this line selection device did not have the function of direction discrimination when it operated,and only selected the one with the maximum 5 harmonic zero sequence current.By changing the neutral point to be grounded through small resistance and using the zero sequence current protection of the protection device to realize the single-phase grounding trip function,the reoccurrence of such problems was avoided.

关 键 词：小电流接地选线装置 消弧线圈 小电阻 

分 类 号：TM07[电气工程—电工理论与新技术]