电测与仪表Issue(17)：110-117,8.
具有防过负荷误动的距离保护新方法
A new method of distance protection preventing overload mal-operation
摘要
Abstract
In allusion to the problem of traditional zone III distance relays can′t identify the line overload and the line fault, this paper specifically analyses the electrical characteristics differences of the overload and the fault in Uφcosφφand the change of phase, then a new method of distance protection zone III preventing overload mal-operation is pro-posed.The method includes two parts:one of them is a method to distinguish phase-to-phase faults from symmetrical overload, which is based on Uφφcos(φφφ+90°-φline )<0.5UNN;the other of them is a method to distinguish single-phase earth fault from unsymmetrical overload, which is based on current asymmetry degree,ARG( U · ·φ2/U 0 ) and ARG · · (Uφ1/U 0 ) (φ=A,B,C) .The implementation scheme of distance protection zone III coping with overload mal-opera-tion is proposed.The method is effective through RTDS simulation verification.关键词
事故潮流转移/距离保护/隐性故障/过负荷/单相接地故障Key words
accident flow transferring/distance protection/hidden failure/overload/single-phase earth fault分类
信息技术与安全科学引用本文复制引用
李辉,宋斌,许捷,陈兴松..具有防过负荷误动的距离保护新方法[J].电测与仪表,2015,(17):110-117,8.基金项目
国家电网公司大电网重大专项资助项目课题 （）
