小电流接地电网故障选线方法的研究  

Research on Low Current Grounding Electric Network Fault Line Selection

作　　者：何金朋[1] 聂赫[2] 刘颖[1] 

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454000 [2]天津市电力公司城西供电分公司,天津300000

出　　处：《煤矿机电》2011年第5期12-15,共4页Colliery Mechanical & Electrical Technology

基　　金：河南理工大学实验室开放基金项目(SKJA10082)

摘　　要：针对我国35 kV及以下配电网小电流接地系统发生单相接地时,健全线路与故障线路暂态零序电流相差不大,影响了选线的精度等状况,设计了一种数字滤波器。它可提取零序电流的纯故障分量,对数据进行相关分析,结合变电站自动化母线绝缘监视装置以及自动重合闸装置,选出故障线路。通过理论分析和Matlab实验仿真表明,这种选线方法,其准确性、可靠性有明显提高。The 35 kV or below power distribution network in China and small current grounding system single phase occurs single grounding,there is less difference between normal lines and fault line transient zero sequence current,which affects the precision of line selection.In view of this,one kind of digital filter is designed.The pure fault component of zero sequence current is extracted and the data is being analyzed,combined with substation automation generatrix insulate monitoring device and automation reclose device,the fault line is selected.The theoretical analysis and Matlab simulation experiment indicates the accuracy and reliability of line selection method has improved significantly.

关 键 词：相关分析 零序电流 故障选线 自动重合闸 

分 类 号：TM712[电气工程—电力系统及自动化]