文章摘要
齐郑,杭天琦,李悦悦.消弧线圈并联小电阻接地方式下的行波测距技术[J].电力系统自动化. DOI: 10.7500/AEPS20190415001.
QI Zheng,HANG Tianqi,LI Yueyue.Technology of Traveling Wave Fault Location for Arc-suppression Coil in Parallel with Low Resistance Grounding Mode[J].Automation of Electric Power Systems. DOI: 10.7500/AEPS20190415001.
消弧线圈并联小电阻接地方式下的行波测距技术
Technology of Traveling Wave Fault Location for Arc-suppression Coil in Parallel with Low Resistance Grounding Mode
DOI:10.7500/AEPS20190415001
关键词: 中压配电网  单相接地故障  行波测距  故障测距  消弧线圈
KeyWords: MV distribution networks  single phase-to-earth fault  traveling wave  fault location  arc-suppression coil
上网日期:2019-11-07
基金项目:国家自然科学基金资助项目; 基于键合图论的综合能源系统动态状态估计研究项目(51777067)
作者单位E-mail
齐郑 华北电力大学 电气与电子工程学院 qizheng319@126.com 
杭天琦 华北电力大学电气与电子工程学院 antique_h@126.com 
李悦悦 国网辽宁省电力有限公司沈阳供电公司 everlora@qq.com 
摘要:
      我国10-35kV中性点经消弧线圈接地方式的中压配电网,越来越多的采用消弧线圈与小电阻并联的解决方案,在发生永久性单相接地故障后投入并联小电阻,使故障电流增大,让保护装置可靠动作断开故障线路,因此在其基础上进行单相接地故障的测距技术研究极具发展前景和必要性。 并联小电阻投入后将产生电流行波并在到达故障点后反射,反射电流行波幅值较大、特征明显。本文因此提出了利用投入并联小电阻产生的电流行波来进行故障测距的方法。本文深入分析了投入并联小电阻后电流行波在线路上的传输特性,以及利用电流行波零模分量和线模分量进行故障测距的单端测距策略。 针对配电网的特点,本文研究了架空线、电缆混合线路的解决方案,以及利用多个检测装置信息的综合测距技术。ATP/EMTP软件的仿真结果证明了所提出的故障测距方法的准确性和实用性。
Abstract:
      China’s 10-35kV MV distribution networks with arc-suppression coil grounding method, more and more solutions, that arc-suppression coils are in parallel with small resistors, are applied. If a permanent single-phase-to-ground fault occurs, the parallel small resistance will be connected, which will increase the fault current and the protection device is reliably operated to trip the fault line. Therefore, research on the fault location technology of single-phase-to-ground fault on the basis of the above has great development prospects and necessity. After the parallel small resistance is connected, the current traveling wave will be generated and reflected when reaching the fault point. The current traveling wave has high amplitude and obvious characteristics. Based on these features, this paper pro-poses a fault location method using the current traveling wave generated by the small resistance. In this paper, the propagation characteristic of the current traveling wave along the line is analyzed and the single terminal fault location method based on the zero-mode and the aerial-mode components are presented. According to the characteristics of distribution network, this paper studies the solutions of hybrid networks with overhead lines and cables as well as the integrated technology using multiple detection devices. The simulation results of ATP/EMTP software confirm the accuracy and practicality of the proposed fault location method.
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