基于伏安特性动态轨迹的谐振接地系统弧光高阻接地故障检测方法  

Detection Method of Arc High Resistance Grounding Fault in Resonant Grounding System Based on Dynamic Trajectory of Volt-ampere Characteristic

作　　者：王宾[1] 崔鑫 WANG Bin;CUI Xin(State Key Lab of Control and Simulation of Power Systems and Generation Equipment(Department of Electrical Engineering Tsinghua University),Haidian District,Beijing 100084,China)

机构地区：[1]电力系统及发电设备安全控制和仿真国家重点试验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2021年第20期6959-6967,共9页Proceedings of the CSEE

基　　金：国家重点研究发展计划项目(2017YFB0902800);国家电网公司科技项目(SGTYHT/16-JS-198)。

摘　　要：在谐振接地系统中发生弧光高阻接地故障时,暂稳态故障电流均微弱,且电弧引发的非线性特征显著。现有检测方法多采用阈值设定的定量分析方法,其可靠性与灵敏性存在明显博弈,难以同时兼顾,正动率较低。针对上述问题,该文分析了弧光高阻接地故障时零模电压与零模电流间的伏安特性动态轨迹,并基于零模电压、零模电流间的初始极性特征和伏安特性动态轨迹设计了一种新的弧光高阻接地故障检测算法,可兼顾检测的灵敏性和可靠性;仿真和现场录波数据验证了所提算法的有效性。In cases of arc high resistance grounding faults in resonant grounding distribution system,transient and steady-state fault currents are both weak,and nonlinear characteristic induced by arc is significant.Most of the existing detection methods adopt the quantitative analysis method with threshold setting,and there is an obvious game between reliability and sensitivity.So it is difficult to take both sides into account at the same time,and the probability of correct action of the protective device is low.In response to this problem,this paper analyzed the dynamic trajectory of volt-ampere characteristics between zero mode voltage and zero mode current.A new arc high resistance grounding fault detection algorithm was designed based on the initial polarity characteristics and the dynamic trajectory of volt-ampere characteristics between zero mode voltage and zero mode,which could realize both sensitivity and reliability of detection;the validity of the algorithm was verified by simulation and field recording data as well.

关 键 词：消弧线圈 弧光高阻 伏安特性 动态轨迹 初始极性 

分 类 号：TM77[电气工程—电力系统及自动化]