一起CT接線錯誤引發(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) 二次變比接線錯誤事件。從安裝調(diào)試測量、檢修測量以及運行維護三個方面進行原因分析,并針對大變比CT可能出現(xiàn)的誤差結(jié)合實例進行了分析,得出在系統(tǒng)低潮流、低負荷的情況下,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,對保護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:TM452 文獻標識碼:B 文章編號: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
參考文獻
[1] 黃勇,周有慶,彭紅海,等. 電流互感器變比測量方法的研究[J]. 變壓器,2002,39(11):31-33.
[2] 馬繼先,郭東升. 電流互感器變比檢查試驗方法[J]. 華北電力技術(shù),1999,22(2):53-54.
[3] 中國電力企業(yè)聯(lián)合會.1 000 kV系統(tǒng)電氣裝置安裝工程電氣設備交接試驗標準:GB/T 50832—2013[S]. 北京:中國計劃出版社,2013:22-23.
[4] 全國電線電纜標準化技術(shù)委員會.電纜的導體:GB 3956—2008[S]. 北京:中國標準出版社,2009:3-6.
[5] 全國互感器標準化技術(shù)委員會. 互感器 第2 部分電流互感器的補充技術(shù)要求:GB 20840.2—2014[S]. 北京:中國標準出版社,2014:13-16.