一起330 kV變壓器繞組電阻異常原因分析及處理
李科云,蔣超偉,柴毅,趙輝,崔巍
(國網寧夏電力有限公司超高壓公司,寧夏 銀川 750011)
摘 要:針對一起 330 kV 電力變壓器繞組直流電阻測試數(shù)據(jù)異常的缺陷,對繞組分段測試,通過相間數(shù)據(jù)橫比和歷史數(shù)據(jù)縱比計算,分析和判斷異常原因,準確研判出缺陷具體部位。經現(xiàn)場對缺陷進行檢修處理,驗證了分析方法的正確性及判斷的準確性,并提出了預防此類故障的措施,提高了變壓器運行的可靠性。
關鍵詞: 變壓器;直流電阻;不平衡;套管
中圖分類號:TM407 文獻標識碼:B 文章編號:1007-3175(2022)12-0047-04
Cause Analysis and Treatment of Abnormal Winding
Resistance of a 330 kV Transformer
LI Ke-yun, JIANG Chao-wei, CHAI Yi, ZHAO Hui, CUI Wei
(State Grid Ningxia Electric Power Co., Ltd. Ultrahigh Voltage Company, Yinchuan 750011, China)
Abstract: As the abnormal test data of winding DC resistance of a 330 kV transformer occurs, the winding is tested in a segmented way to analyze the reason for the abnormal data. Through making horizontal comparison of phase data and vertical comparison of historical data, the paper finds out the specific defect parts accurately. The correctness of this analysis method and the accuracy of judgment are verified by onsite inspection of defect parts, and preventive measures of this kind of faults are put forward to improve the reliability of transformer operation.
Key words: transformer; DC resistance; unbalance; casing pipes
參考文獻
[1] 李建明,朱康. 高壓電器設備試驗方法[M].2 版. 北京:中國電力出版社,2001.
[2] 國家電網公司科技部. 輸變電設備狀態(tài)檢修試驗規(guī)程:Q/GDW 1168—2013[S] . 北京:國家電網公司,2014:7-8.
[3] 康真,張梅. 大容量變壓器直阻測試產生的剩磁危害及消除[J]. 寧夏電力,2014(5):18-22.
[4] 張巍,周秀,丁培,等. 兩起主變壓器套管漏油故障原因分析及防范措施[J] . 寧夏電力,2021(2):63-65.
[5] 胡興龍,李莉. 電力變壓器繞組直流電阻不平衡率超標的分析及防止對策[J]. 電工技術,2007(10):29-30.
[6] 周秀,田天,羅艷,等. 一起 330 kV 主變壓器異常原因分析與處理[J]. 變壓器,2020,57(7):86-87.
[7] 杜永濤,姜勇. 變壓器直流電阻不平衡系數(shù)超標原因分析[J]. 寧夏電力,2012(4):21-24.
[8] 羅艷,周秀,唐長應,等. 一起 10 kV 配電變壓器短路故障分析[J]. 寧夏電力,2020(4):50-53.
[9] 董勇. 電力變壓器直流電阻不平衡率超標案例[J].冶金動力,2009(2):20-21.