Suzhou Electric Appliance Research Institute
期刊号: CN32-1800/TM| ISSN1007-3175

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一起CT接线错误引发的大变比CT的误差分析

来源:电工电气发布时间:2018-09-13 10:13 浏览次数:522
一起CT接线错误引发的大变比CT的误差分析
 
刘杰,黄陆明,朱圣群,徐庆峰,豆宝
(国网浙江省电力有限公司检修分公司,浙江 杭州 311232)
 
    摘 要:介绍了一起电流互感器(CT) 二次变比接线错误事件。从安装调试测量、检修测量以及运行维护三个方面进行原因分析,并针对大变比CT可能出现的误差结合实例进行了分析,得出在系统低潮流、低负荷的情况下,大变比CT的二次电流比较小,不在CT的理想工作范围内误差较大,对保护装置的判别提出了更高的要求。
    关键词:电流互感器;回路直流电阻;大变比CT;CT误差
    中图分类号:TM452     文献标识码:B     文章编号:1007-3175(2018)09-0042-04
 
Error Analysis of Big Transformation Ratio Current Transformer Caused by a Case of Error Current Transformer Connection
 
LIU Jie, HUANG Lu-ming, ZHU Sheng-qun, XU Qing-feng, DOU Bao
(Maintenance Company of State Grid Zhejiang Electric Power Company, Hangzhou 311 232, China)
 
    Abstract: Introduction was made to an error event of current transformer (CT) secondary transformation ratio error connection. This paper analyzed three reasons such as installation and debugging measurement, maintenance measurement and operation maintenance, as well as the possible existing error combined with living examples in allusion to the big transformation ratio CT. It is concluded that the secondary current of the big transformation ratio CT is smaller under low current and low load, and the error is bigger when it is not in the ideal working range of CT, which makes the identification of the protective device have higher demands.
    Key words: current transformer; circuit direct current resistance; big transformation ratio current transformer; current transformer error
 
参考文献
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