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作 者:朱革兰[1] 李松奕 兰金晨 曾德辉[1] 刘胤良 ZHU Gelan;LI Songyi;LAN Jinchen;ZENG Dehui;LIU Yinliang(College of Electric Power,South China University of Technology,Guangzhou 510641,China;Electric Power Research Institute,China Southern Power Grid,Guangzhou 510063,China)
机构地区:[1]华南理工大学电力学院,广东广州510641 [2]南方电网科学研究院,广东广州510063
出 处:《电力自动化设备》2021年第1期34-40,68,共8页Electric Power Automation Equipment
基 金:广东省自然科学基金资助项目(2018A030310354)。
摘 要:针对现有配电网故障区段定位方法存在对不同接地故障的适应性不强、灵敏度低等问题,分析了谐振接地配电网在发生经不同过渡电阻接地故障时,故障点上、下游的零序电流和零序电压暂态分量的特征,得出了故障点上、下游零序电流在1个工频周期内的积分与零序电压差值的比值(零序特征量)存在较大差别的结论。基于这一结论提出一种能够适用于谐振接地配电网接地故障区段定位的方法。仿真结果表明所提故障区段定位方法在高阻接地故障、低阻接地故障和非线性弧光接地故障下都具有较好的可行性。The existing fault section location methods of distribution network have been found with poor adaptability to different grounding faults,low sensitivity and other problems,aiming at which,the characteristics of zero-sequence current and zero-sequence voltage transient components at upstream and downstream of the fault point under different transition resistances when a grounding fault occurs in the resonance grounding distribution network are analyzed.It is concluded that the ratio between the integral of the zerosequence current within a power frequency period and the zero-sequence voltage,i.e.the zero-sequence characteristic,at the upstream of the fault point is significantly different from that at the downstream of the fault point.Based on this conclusion,a fault section location method that can be used in resonance grounding distribution network is proposed.The simulative results show that the proposed fault section location method is feasible for high-resistance grounding fault,low-resistance grounding fault and nonlinear arc grounding fault.
关 键 词:配电网 故障区段定位 谐振接地 零序特征量 配电自动化
分 类 号:TM773[电气工程—电力系统及自动化]
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