计及过渡电阻影响的接地距离保护方法研究  

Research on distance protection method considering the influence of grounding transition resistance

作　　者：高海龙 GAO Hailong(Chengdu Power Supply of State Grid Sichuan Electric Power Company,Chengdu 61000,China)

机构地区：[1]国网四川省电力公司成都供电公司,四川成都610000

出　　处：《电气应用》2023年第3期47-51,共5页Electrotechnical Application

摘　　要：距离保护作为输电线路保护的重要组成部分,在高压及超高压电网中获得了广泛应用。然而,发生故障时过渡电阻的存在严重威胁着距离保护动作正确性,易导致保护误动作或拒动作行为。通过相量分析,结合系统中电压与电流的几何分布特性,对传统测量阻抗进行变换修正,构建新型自适应距离保护动作判据。通过MATLAB软件进行仿真,得到不同故障位置、不同接地电阻和不对称负荷运行情况下的测量阻抗值,仿真结果验证了该距离保护的正确性和可靠性。Stance protection is an important part of transmission line protection.It has been widely used in high voltage and ultra-high voltage power grid.The grounding fault transition resistance seriously affects the accuracy of distance protection operation.It is easy to lead to mal-operation or failure operation.The traditional measured impedance is modified by the phasor analysis combined with the geometric distribution characteristics of voltage and current.A new adaptive distance protection operation criterion is proposed.The measured impedance values are obtained for different fault location,different grounding resistance and asymmetric load by MATLAB simulation.The simulation results verify the reliability and security of the modified distance protection.

关 键 词：距离保护 过渡电阻 测量阻抗 修正因子 

分 类 号：TM773[电气工程—电力系统及自动化]