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(guó)網(wǎng)寧夏電力有限公司超高壓公司,寧夏 銀川 750011)
摘 要:針對(duì)一起 330 kV 電力變壓器繞組直流電阻測(cè)試數(shù)據(jù)異常的缺陷,對(duì)繞組分段測(cè)試,通過(guò)相間數(shù)據(jù)橫比和歷史數(shù)據(jù)縱比計(jì)算,分析和判斷異常原因,準(zhǔn)確研判出缺陷具體部位。經(jīng)現(xiàn)場(chǎng)對(duì)缺陷進(jìn)行檢修處理,驗(yàn)證了分析方法的正確性及判斷的準(zhǔn)確性,并提出了預(yù)防此類故障的措施,提高了變壓器運(yùn)行的可靠性。
關(guān)鍵詞: 變壓器;直流電阻;不平衡;套管
中圖分類號(hào):TM407 文獻(xiàn)標(biāo)識(shí)碼:B 文章編號(hào):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
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