基于暂态录波型故障指示器的小电流接地系统双回线路异相接地分析  

Analysis of Out-of-phase Grounding of Double Circuit in Small Current Grounding System Based on Transient Recording Fault Indicator

作　　者：贺玫璐 薛鹏飞 苗轶如 HE Meilu;XUE Pengfei;MIAO Yiru(School of Electronic Information Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Taiyuan Power Supply Company,State Grid Taiyuan Electric Power Co.,Ltd.,Taiyuan 030012,China;Quanzhou Hunan University Industrial Design and Machine Intelligence Innovation Research Institute,Quanzhou 362006,China)

机构地区：[1]太原科技大学电子信息工程学院,山西太原030024 [2]国网山西省电力公司太原供电公司,山西太原030012 [3]泉州湖南大学工业设计与机器智能创新研究院,福建泉州362006

出　　处：《电工技术》2024年第10期100-104,共5页Electric Engineering

基　　金：山西省高等学校科技创新项目(编号2023L174);福建省自然科学基金资助项目(编号2022J05109)。

摘　　要：10 kV配电设备运行环境日趋复杂,接地拉路查找故障点用时较长。当发生单相接地短路故障时,通过暂态录波型故障指示器合成的零序电压启动研判,再通过横向对比故障线路、非故障线路的零序电流大小和方向,纵向对比故障线路的零序电流大小和方向,进行故障线路、故障分支线路选线、选段,可提高故障查找效率。利用MATLAB/Simulink搭建仿真模型,分析电网各节点三相电流、零序电流波形,同时在小电流接地系统双回线路异相接地实际故障中采集暂态录波型故障指示器实测波形,均有效验证了通过零序电压、零序电流研判故障的实用性。The operating environment of 10 kV distribution equipment is becoming more and more complex,and it takes a long time to locate the fault point.When the single-phase grounding short-circuit fault occurs,the zero sequence voltage is used to start the determination,and then faulty line and faulty branch line are selected by comparing size and direction of zero sequence current of faulty line and unfaulty line horizontally and comparing size and direction of zero sequence current of faulty line vertically.MATLAB/Simulink was used for modelling to analyze three-phase current and zero-sequence current waveform of each node in the power grid.Meanwhile,the measured waveform of the transient recording type fault indicator was collected from actual fault of out-of-phase grounding of double-circuit line,which effectively verified the practicability of fault detection by zero-sequence voltage and zero-sequence current.

关 键 词：单相接地 异相接地 暂态录波型故障指示器 零序电流 

分 类 号：TM464[电气工程—电器]