分级式高压可控并联电抗器微机保护配置及原理分析  

Configuration and Principle Analysis of Microcomputer Protection for Classified High-voltage Controllable Shunt Reactor

作　　者：姚晴林 李瑞生 粟小华[2] 张健康[2] 张项安 曹丽璐 

机构地区：[1]许继电气股份有限公司,河南省许昌市461000 [2]西北电力调度通信中心,陕西省西安市710048

出　　处：《电力系统自动化》2009年第21期58-65,共8页Automation of Electric Power Systems

基　　金：西北电网有限公司科技项目~~

摘　　要：分析了高压可控并联电抗器匝间短路时负序电流和零序电流的计算方法,并以晋东南—荆门1000kV特高压电网实例进行计算,得出了有价值的结论,依据计算所得结论提出了电抗器新原理的绝对值比较式负序及零序复合型方向保护判据,其灵敏度较高、整定方便。分析认为:由于分级式可控并联电抗器的特殊结构及其纵差保护主要是保护高、低压侧的单相接地故障,因此宜采用分侧差动,不宜采用一般变压器常规的高、低压侧电流互感器组成的差动,也不宜采用零差。The calculation method of negative sequence and zero sequence current caused by turn-to-turn short circuit of a HV controllable reactor is analyzed. As an example, this method is used for calculation of Jindongnan-Jingmen 1 000 kV ultra-highvoltage grid in east-southern Shanxi Province and obtained useful results. According to this, a new algorithm with higher sensitivity and easy setting is proposed based on absolute value comparison for the negative and zero sequence composed direction protection criterion. Owing to the special structure of classified controllable shunt reactor and its main differential protection used to protect single-phase ground fault on HV and LV side, this paper suggests that the conventional differential protection with current transformers on HV and LV sides for common transformer is no-longer suit for the protection of controllable shunt reactor, and neither for zero-seouence current differential principle.

关 键 词：可控电抗器 匝间短路 绝对值比较式 微机保护 

分 类 号：TM47[电气工程—电器] TM77