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

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一起高廠變差動速斷保護誤動分析及建議

來源:電工電氣發(fā)布時間:2019-02-19 09:19 瀏覽次數(shù):770
一起高廠變差動速斷保護誤動分析及建議
 
王華衛(wèi)
(華電電力科學研究院有限公司,浙江 杭州 310030)
 
    摘 要:針對一起因6 kV電纜故障導致高壓廠用變壓器(高廠變)誤動的事故,從CT測量特性及保護定值校核等方面對誤動原因進行了排查分析,指出本次差動誤動是高低壓側(cè)故障電流的直流分量占比較大,造成相位差偏差較大,引發(fā)差動速斷保護誤動作,并建議差動速斷保護定值在滿足靈敏性的前提下盡量提高,不必拘泥于導則的推薦值。
    關(guān)鍵詞:高壓廠用變壓器;差動速斷保護;保護誤動
    中圖分類號:TM403.5     文獻標識碼:B     文章編號:1007-3175(2019)02-0044-04
 
Analysis and Suggestion of a Case of Differential Quick-Break Protection for
High-Voltage Auxiliary Transformer Malfunction
 
WANG Hua-wei
(HUADIAN Electric Power Research Institute Co., Ltd, Hangzhou 310030, China)
 
    Abstract: Aiming at a case of an accident caused by a 6 kV cable fault causing high-voltage auxiliary transformer malfunction, this paper carried out troubleshoot and analysis for the malfunction from the aspects of current transformer measurement characteristic and protection constant value check etc and pointed out that in this differential malfunction the direct current component of failure current at high and low voltage sides had bigger proportion, so as to cause bigger phase differences and to trigger differential quick-break protection malfunction. It is suggested that the constant value of differential quick-break protection should be enhanced to the greatest extent and needn’t stick to the recommended value of guide rule under the precondition satisfying sensitivity.
    Key words: high-voltage auxiliary transformer; differential quick-break protection; protection malfunction
 
參考文獻
[1] 賀家李,李永麗,董新洲,等. 電力系統(tǒng)繼電保護原理[M]. 4 版. 北京:中國電力出版社,2010.
[2] 電力規(guī)劃設(shè)計總院. 電流互感器和電壓互感器選擇及計算規(guī)程:DL/T 866—2015[S]. 北京:中國計劃出版社,2015:37-38.
[3] 中國電力企業(yè)聯(lián)合會. 大型發(fā)電機變壓器繼電保護整定計算導則:DL/T 684—2012[S]. 北京:中國電力出版社,2012:30-34.
[4] 中國電力企業(yè)聯(lián)合會. 廠用電繼電保護整定計算導則:DL/T 1502—2016[S]. 北京:中國電力出版社,2016:4-8.