主动干预型消弧装置的附加电阻故障选相方法  

Additional resistance based fault phase identification method suitable for active interference arc suppression device

作　　者：王鹏 张贺军 徐凯 徐铭铭 石访 WANG Peng;ZHANG Hejun;XU Kai;XU Mingming;SHI Fang(State Grid Henan Eletric Power Company Research Institute,Zhengzhou 450006,China;Equipment Administration Department,State Grid Corporation of China,Beijing 100031,China;School of Electrical Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南郑州450006 [2]国家电网有限公司设备管理部,北京100031 [3]山东大学电气工程学院,山东济南250061

出　　处：《电力工程技术》2020年第4期180-186,共7页Electric Power Engineering Technology

基　　金：国家电网有限公司总部科技项目“主动干预型消弧装置应用技术研究”。

摘　　要：正确选定故障相是主动干预型消弧装置正确动作的前提和基础,误选将引发更严重的相间短路故障。为提高故障选相准确率,文中提出了一种中性点附加电阻的选相方法。该方法通过投切附加电阻,实现线路对地参数的快速估计;进而利用系统正常状态和故障状态下各相对地参数的变化差异,精确辨别故障相。仿真结果表明,该方法性能优于传统的相电压幅值比较法,在发生高阻接地和电弧接地时仍具有较高的选相准确率。The accurate identification of the faulty phase is of great importance for active interference arc suppression device.When mis-selection occurs,more serious inter-phase fault occurs. In order to improve the accuracy of fault phase selection,method of phase selection using additional resistance of neutral point is presented. The method calculates the parameters of ground in real time by switching in/off the additional resistance on the neutral point,and the equivalent impedance of the network can be estimated. Then the fault phase can be identified by using the difference of parameters between normal and fault states. Simulation results show that this method performed better than the traditional phase voltage amplitude comparison method. The accuracy for faulty phase selection is high even under arcing or high resistance grounding fault scenarios.

关 键 词：主动干预型消弧装置 单相接地故障 中性点附加电阻 故障选相 高阻接地 

分 类 号：TM72[电气工程—电力系统及自动化]