小电阻接地系统接地阻抗继电器动作行为分析  

Analyzing grounding impedance relay action In low resistance grounding system

作　　者：张向亮 蒋浩浩 陈菲涵 蔡志端 王孝顺 罗四倍 祝艳华 许宇翔 ZHANG Xiangliang;JIANG Haohao;CHEN Feihan;CAI Zhiduan;WANG Xiaoshun;LUO Sibei;ZHU Yanhua;XU Yuxiang(Huzhou College,Huzhou 313000 China;Nanjing Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211102 China)

机构地区：[1]湖州学院智能制造学院,浙江湖州313000 [2]国网江苏南京供电分公司,江苏南京211102

出　　处：《新余学院学报》2024年第5期31-39,共9页Journal of Xinyu University

摘　　要：基于小电阻接地系统发生单相经过渡电阻接地的复合序网图,推导出A、B、C相接地阻抗继电器的测量阻抗表达式和动作特性,在阻抗复数平面上比较动作特性圆和测量阻抗,分析出故障相和非故障相接地阻抗继电器的动作情况和影响因素,得出前者受过渡电阻的影响较大、易拒动、而后者受过渡电阻和中性点电阻的影响不会误动的结论。在Matlab平台上采用Simulink工具搭建上述系统故障情况的仿真模型并进行实验,仿真结果验证了上述结论的正确性。Based on the complex sequence network diagram of single-phase grounding through transition resistance in low resistance grounding system,the paper firstly deduces the measurement impedance expression and action characteristics of A,B and C phase grounding impedance relays,then compares the action characteristic circle and measurement impedance on the complex impedance plane,finally analyzes the action conditions and influencing factors of fault phase and non-fault phase grounding impedance relays.It is concluded that the former is easy to refuse action under the influence of transition resistance,while the latter doesn′t show false action under the influence of transition resistance and neutral grounding resistance.The simulation model of the above system single-phase grounding fault situation is built in Matlab/Simulink platform and the experiment is carried out.The simulation is used to verify the conclusion.

关 键 词：小电阻接地系统 接地阻抗继电器 测量阻抗表达式 动作特性圆 过渡电阻 

分 类 号：TM771[电气工程—电力系统及自动化]