Suzhou Electric Appliance Research Institute
期刊號(hào): CN32-1800/TM| ISSN1007-3175

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一起CT接線錯(cuò)誤引發(fā)的大變比CT的誤差分析

來(lái)源:電工電氣發(fā)布時(shí)間:2018-09-13 10:13 瀏覽次數(shù):654
一起CT接線錯(cuò)誤引發(fā)的大變比CT的誤差分析
 
劉杰,黃陸明,朱圣群,徐慶峰,豆寶
(國(guó)網(wǎng)浙江省電力有限公司檢修分公司,浙江 杭州 311232)
 
    摘 要:介紹了一起電流互感器(CT) 二次變比接線錯(cuò)誤事件。從安裝調(diào)試測(cè)量、檢修測(cè)量以及運(yùn)行維護(hù)三個(gè)方面進(jìn)行原因分析,并針對(duì)大變比CT可能出現(xiàn)的誤差結(jié)合實(shí)例進(jìn)行了分析,得出在系統(tǒng)低潮流、低負(fù)荷的情況下,大變比CT的二次電流比較小,不在CT的理想工作范圍內(nèi)誤差較大,對(duì)保護(hù)裝置的判別提出了更高的要求。
    關(guān)鍵詞:電流互感器;回路直流電阻;大變比CT;CT誤差
    中圖分類號(hào):TM452     文獻(xiàn)標(biāo)識(shí)碼:B     文章編號(hào):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
 
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