谐振接地系统的配电线路接地故障选线新方法  

Line detection method for grounding fault in resonant grounding systems

作　　者：田晶京[1] 耿芳 赵峰[1] 高锋阳[1] 李安乐 TIAN Jingjing;GENG Fang;ZHAO Feng;GAO Fengyang;LI Anle(School of Automation and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,P.R.China)

机构地区：[1]兰州交通大学自动化与电气工程学院,兰州730070

出　　处：《重庆大学学报》2022年第1期59-67,共9页Journal of Chongqing University

基　　金：甘肃省重点研发计划资助项目(18YF1FA058)。

摘　　要：针对因消弧线圈引起的故障电流信号微弱,造成谐振接地系统发生单相接地故障识别率进一步降低的情况,考虑故障线路与非故障线路间零序电流波形相似度低的特点,提出一种谐振接地系统的配电线路接地故障选线新方法。用HHT(Hilbert-Huang teansform)和时频谱带通滤波法处理零序电流波形,构建各线路零序电流波形的时频能量矩阵,结合图像识别中的相似度识别法与综合相似系数矩阵,实现线路接地故障选线。结果表明,该选线方法对噪声干扰、两点接地故障等情况均有效。The identification rate of fault line for single-phase earth fault in resonant grounding system is normally low due to the weak fault current signal by the arc suppression coil. This paper proposes a new method to detect the fault line in resonant grounding systems based on the characteristics of the low similarity between zero-sequence current waveform through fault line and the one through non-fault line. First, the HHT(Hilbert-Huang transform) method and time-spectrum band-pass filtering method are used to process the zero-sequence current waveform. Then, the time-frequency energy matrix of the zero-sequence current waveform through each line is constructed. Finally, the detection of the fault line is realized by combining the similarity recognition method in image recognition with comprehensive similarity coefficient matrix. Simulation results illustrate that the proposed fault line detection method is effective and reliable for noise interference and two-point grounding fault in resonant grounding systems.

关 键 词：谐振接地系统 故障选线 零序电流波形 时频能量矩阵 相似度识别 

分 类 号：TM711[电气工程—电力系统及自动化]