输电线路高频保护通道延时的行波特性分析  

Analysis of traveling wave’s channel delay effect of the transmission line HF protection

作　　者：黄景光[1] 胡汉梅[1] 蒋秀洁[1] 

机构地区：[1]三峡大学电气信息学院,湖北宜昌443002

出　　处：《继电器》2007年第2期15-19,共5页Relay

摘　　要：高频保护传统分析方法仅考虑高频信号在通道中的延时效应,没有分析电气量的行波延时效应。该文指出传统方法的不足,分析电力系统故障后电气量和高频信号的行波特性,综合考虑自故障发生到线路两侧高频保护完成故障判断,故障电气量和高频信号在各环节中的延时效应,以及最终产生的高频信号的时间差或相位差,并分析了通道延时效应对高频保护动作特性的影响。通过分析认为:为了避免外部故障时出现误动作,方向高频保护应考虑2倍线路长度的通道延时效应,相差高频保护闭锁角整定应考虑2倍线路长度的通道相位滞后效应;线路内部发生短路故障时,相差高频保护容易发生两侧保护相继动作;在线路长度较大,相差高频保护有发生两侧保护都进入闭锁区而拒动的可能。The classic analysis of high-frequency （HF） protection only takes account of the channel delay effect of HF signal, neglects the delay effect of electric traveling wave. This paper corrects the error and analyses the characteristics of the electric and HF signals＇ traveling waves after an electric failure, and takes account in the general of the effects of the electric and HF signals in all courses from the failure happening to the HF protection relays finishing detection in the both ends of the wire lines and the corresponding delays of times or phases, and analyses the channel delay effects＇ influence on the operating characteristics of HF protection relays. As a result, the paper declares that to avoid mal-operation when a failure happens out of protection zone the direction HF protection needs to count double channel time delay effect of the wire line and the blocking angle setting of phase differential HF protection needs to count double channel phase delay effect of the wire line; when a failure happens in a high voltage transmission line, its phase differential HF protections in the both ends may operate asynchronously but successively, and even both be blocked and fail to trip breakers if the line is long enough.

关 键 词：高频保护 高频通道 保护拒动 相继动作 行波 延时效应 

分 类 号：TM773[电气工程—电力系统及自动化]