| 引用本文: | 王鹏玮,徐丙垠,陈恒,李峰,王玮,赵艳雷,孙中玉.基于波形比较的架空配电线路故障离线定位自动计算方法[J].电力自动化设备,2021,41(6): |
| WANG Pengwei,XU Bingyin,CHEN Heng,LI Feng,WANG Wei,ZHAO Yanlei,SUN Zhongyu.Automatic calculation method for off-line fault location of overhead distribution line based on waveform comparison[J].Electric Power Automation Equipment,2021,41(6): |
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| 摘要: |
| 现有的架空配电线路在线故障定位方法存在只能确定故障区段的不足，离线故障定位方法则存在故障定位灵敏度低与精度差的问题。针对上述问题，建立高压脉冲冲击线路响应模型，通过分析故障线路电流分布特征与波形差异，提出了一种基于波形比较的架空配电线路故障离线定位自动计算方法。该方法使用高压脉冲信号发生器向故障线路注入直流脉冲信号，以相关系数作为波形相似程度的判别依据，通过分析不同测量点电流波形与基准电流波形的相似性差异，实现了故障定位的自动计算，解决了故障尤其是经高阻接地故障定位灵敏度低的问题。分析了不同磁场测量方式与基准信号参考点的选取对故障定位精度的影响，完善了故障离线定位体系，提高了定位精度。仿真以及实际试验表明，该方法可有效实现故障点的精确定位。 |
| 关键词: 架空配电线路 故障离线定位 自动计算 波形比较 磁场测量方式 定位精度 |
| DOI：10.16081/j.epae.202103021 |
| 分类号:TM77;TM726.3 |
| 基金项目:国家重点研发计划项目(2017YFB0902800)；国家电网公司科技项目(52094017003D) |
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| Automatic calculation method for off-line fault location of overhead distribution line based on waveform comparison |
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WANG Pengwei1, XU Bingyin1, CHEN Heng2, LI Feng2, WANG Wei1, ZHAO Yanlei1, SUN Zhongyu1
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1.Smart Grid Research Institute, College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China;2.Shandong Kehui Electric Automation Co.,Ltd.,Zibo 255000, China
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| Abstract: |
| The existing on-line fault location methods for overhead distribution lines can only locate the fault section, while the off-line fault location methods have the problems of low sensitivity and poor accuracy. In order to solve the above problems, a response model of high voltage impulse line is proposed. By analyzing the current distribution characteristics and waveform differences of fault lines, an automatic calculation method for off-line fault location of overhead distribution line based on waveform comparison is proposed. The high voltage pulse signal generator is used to inject DC pulse signal into the fault line, and the correlation coe-fficient is used to judge the similarity degree between the waveforms. By analyzing the deference of similarity degree between the current waveforms at different measuring points and the reference current waveform, the automatic calculation of fault location is realized, and the problem of low sensitivity of fault location, especial-ly the high resistance grounding fault, is solved. The influence of different magnetic field measurement methods and the selection of reference signal reference point on fault location accuracy is analyzed. The off-line fault location system is improved and the locating accuracy is improved. Simulation and actual test show that the proposed method can effectively locate the fault point. |
| Key words: overhead distribution line off-line fault location automatic calculation waveform comparison magnetic field measurement method locating accuracy |
