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

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基于直流電導率評估老化油紙絕緣水分變化的研究

來源:電工電氣發(fā)布時間:2017-08-23 11:23 瀏覽次數(shù):9
基于直流電導率評估老化油紙絕緣水分變化的研究
 
周遠化1,周遠科2,李紅艷3,劉毅1
(1 三峽大學 電氣與新能源學院,湖北 宜昌 443002;2 國網安徽省電力公司,安徽 合肥 230022;3 國網蚌埠供電公司,安徽 蚌埠 233000)
 
     摘 要:變壓器在老化運行中產生的水分會大大降低變壓器的絕緣性能。在實驗室條件下研究了變壓器老化過程中的水分變化情況,對油紙樣品實行快速老化,獲得了4 組不同老化程度的樣品,測試樣品的極化/去極化電流(PDC),通過計算不同樣品的電導率評估出了樣本中的水分含量。研究結果表明:隨著老化程度的加深,油紙系統(tǒng)的吸收比、極化指數(shù)逐漸減小,直流電導率逐漸升高,水分含量逐漸增大。
    關鍵詞:直流電導率;極化/去極化電流;老化;油紙系統(tǒng);水分
    中圖分類號:TM855     文獻標識碼:A     文章編號:1007-3175(2017)08-0051-04
 
Research on Moisture Change of Aging Oil Paper Insulation Based on Direct Current Conductivity Evaluation
 
ZHOU Yuan-hua1, ZHOU Yuan-ke2, LI Hong-yan3, LIU Yi1
(1 College of Electrical Engineering and New Energy, Three Gorges University, Yichang 443002, China;
2 State Grid Anhui Electric Power Company, Hefei 230022, China; 3 State Grid Bengbu Power Electric Supply Company, Bengbu 233000, China)
 
    Abstract: The water which produced during the transformer aging operation will greatly reduce the insulation performance of transformer. This paper studied the moisture change of transformer aging process in laboratory. The oil paper samples were rapidly carried out aging to obtain groups of samples with different aging degree and to measure the polarization and depolarization current. The moisture content of samples was calculated by calculating the conductivity of different samples. The results show that with the deepening of aging, the absorption ratio and polarization index of oil paper system decreased gradually, the direct current conductivity increased, as well as the moisture content.
    Key words: direct current conductivity; polarization and depolarization current; aging; oil paper system; moisture
 
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