小电流接地配电线路弧光高阻接地故障电压特征分析  

Analysis of the arc high impedance grounding faults voltage characteristics in non-effective grounding feeders

作　　者：邱进 崔鑫 田野 王宾[3] 李冠华 QIU Jin;CUI Xin;TIAN Ye;WANG Bin;LI Guanhua(China Electric Power Research Institute,Beijing 100192,China;State Key Laboratory of Power Grid Environmental Protection,Wuhan 430074,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments(Department of Electric Engineering of Tsinghua University),Beijing 100084,China;State Grid Liaoning Electric Power Research Institute,Shenyang 110003,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]电网环境保护国家重点实验室,湖北武汉430074 [3]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京100084 [4]国网辽宁省电力有限公司电力科学研究院,辽宁沈阳110003

出　　处：《电力系统保护与控制》2019年第16期115-121,共7页Power System Protection and Control

基　　金：国家电网公司总部项目资助“配电网多态复杂故障特征库及自适应辨识关键技术研究”(GY71-17-032)~~

摘　　要：中性点非有效接地系统单相弧光高阻接地故障检测的难点在于如何实现灵敏启动。现有的检测方法以零序电压的幅值越限作为启动判据,但是由于对越限门槛值的整定直接影响着检测的灵敏性和可靠性,在实际运行中往往难以同时兼顾。针对该问题,基于现场实测故障录波数据,采用数值统计、傅里叶变换、图形对比等方法从时域、频域角度分析了单相弧光高阻故障的暂态电压特征。搭建了弧光高阻接地故障暂态模型,仿真验证了所提取的暂态电压特征的正确性,为后续故障选线装置应对单相弧光高阻故障的灵敏启动判据开发提供了基础。The difficulty of single-phase arc high impedance grounding fault detection in neutral ineffectively grounded system lies in how to realize sensitive start.The current detection methods use the zero sequence voltage amplitude limit as the starting criterion,but the setting of the limit value directly affects the sensitivity and reliability of detection,it is often difficult to take into account both in practical operation.Aiming at this problem,based on the field wave recording data,this paper analyzes the transient voltage characteristics in the event of the single-phase arc high impedance grounding fault by means of numerical statistics,Fourier transform and graph comparison from the time domain and frequency domain.Meanwhile,the transient model of arc high impedance grounding fault is established,which verifies the validity of the transient voltage characteristics features extracted.It lays a foundation for the subsequent development of sensitive start criterion of faulty line selection device when single-phase arc high impedance grounding fault occurs.

关 键 词：小电流接地 配电线路 弧光 高阻接地 零序电压 

分 类 号：TM7[电气工程—电力系统及自动化]