摘　要：谐振接地系统(NES)发生单相接地故障时,由于故障电流小及接地点电弧不稳定等原因,其零序故障电流准确获取和定值整定困难,使其故障线路的检出仍是难题.在分析小电流接地系统单相电弧接地故障时各线路零序暂态电流特征的基础上,提出一种基于暂态电流的故障选线自适应方法.利用所有健全线路暂态电流与故障线路暂态电流之差为最小值的原理,构成故障选线算法.新方法不仅能消除故障电流小和接地点电弧不稳定影响,而且还能在短线故障时,克服健全长线电容电流的影响,有很强的抗干扰能力,毋需整定,不涉及极性和方向的判断,具有自适应性,可大大改善保护对故障线路检出性能.大量的数字仿真结果表明,该方法有效.
关键词：谐振接地系统;单相接地故障;暂态电流;自适应保护
分类号：TM771　文献标识码：A
文章编号：1004-9649(2007)07-0042-06

An adaptive approach to selecting fault circuit in arc suppression coils system using transient current

SHU Hong-chun　 SUN Xiang-fei　 LIU Juan　 HAN Wu　 ZHU Wen-tao　

基金项目：国家自然科学基金资助项目(90610024,50467002,50347026);云南省科技攻关项目(2003GG10);云南省自然科学基金项目(2005F0005Z,2004E0020M,2002E0025M)
作者简介：束洪春(1961-),男,江苏丹阳人,博士后,教授,博士生导师,从事新型继电保护、故障测距、数字信号处理及DSP应用、电力系统CTI技术等研究.E-mail:kmshc@sina.com
作者单位：束洪春（昆明理工大学,电力工程学院,云南,昆明,650051;哈尔滨工业大学,电气工程系,黑龙江,哈尔滨,150001）　
　　　　　 孙向飞（哈尔滨工业大学,电气工程系,黑龙江,哈尔滨,150001）　
　　　　　 刘娟（昆明供电局,云南,昆明,650011）　
　　　　　 韩武（昆明供电局,云南,昆明,650011）　
　　　　　 朱文涛（昆明供电局,云南,昆明,650011）　

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收稿日期：2006年11月29日

修稿日期：2007年4月7日

出版日期：2007年7月5日