基于直流電導(dǎo)率評(píng)估老化油紙絕緣水分變化的研究
周遠(yuǎn)化1,周遠(yuǎn)科2,李紅艷3,劉毅1
(1 三峽大學(xué) 電氣與新能源學(xué)院,湖北 宜昌 443002;2 國(guó)網(wǎng)安徽省電力公司,安徽 合肥 230022;3 國(guó)網(wǎng)蚌埠供電公司,安徽 蚌埠 233000)
摘 要:變壓器在老化運(yùn)行中產(chǎn)生的水分會(huì)大大降低變壓器的絕緣性能。在實(shí)驗(yàn)室條件下研究了變壓器老化過(guò)程中的水分變化情況,對(duì)油紙樣品實(shí)行快速老化,獲得了4 組不同老化程度的樣品,測(cè)試樣品的極化/去極化電流(PDC),通過(guò)計(jì)算不同樣品的電導(dǎo)率評(píng)估出了樣本中的水分含量。研究結(jié)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(dǎo)率逐漸升高,水分含量逐漸增大。
關(guān)鍵詞:直流電導(dǎo)率;極化/去極化電流;老化;油紙系統(tǒng);水分
中圖分類號(hào):TM855 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):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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