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
參考文獻(xiàn)
[1] 楊麗君,齊超亮,呂彥冬,等. 熱老化時(shí)間及測(cè)試溫度對(duì)油紙絕緣時(shí)域介電特性的影響[J]. 中國(guó)電機(jī)工程學(xué)報(bào),2013,33(31):162-169.
[2] 歐小波,周丹,林春耀,等. 油浸式電力變壓器老化及壽命評(píng)估研究綜述[J]. 南方電網(wǎng)技術(shù),2015,9(9):58-70.
[3] 嚴(yán)家明,廖瑞金,楊麗君,等. 局部放電作用下油浸絕緣紙的微觀結(jié)構(gòu)及電氣性能[J]. 中國(guó)電機(jī)工程學(xué)報(bào),2011,31(19):114-121.
[4] 廖瑞金,劉捷豐,呂彥冬,等. 變壓器油紙絕緣含水量定量評(píng)估的頻域介電特征參量研究[J]. 電工技術(shù)學(xué)報(bào),2015,30(1):204-211.
[5] 劉捷豐,廖瑞金,呂彥冬,等. 電力變壓器油紙絕緣含水量定量評(píng)估的時(shí)域介電特征量[J]. 電工技術(shù)學(xué)報(bào),2015,30(2):196-203.
[6] EKANAYAKE C, GUBANSKI S M, GRACZKOWSKI A, et al. Frequency response of oil impregnated pressboard and paper samples for estimating moisture in transformer insulation[J].IEEE Transactions on Power Delivery,2006,21(3):1309-1317.
[7] 許淵,劉有為,王文煥,等. 大型電力變壓器油紙絕緣含水量的介質(zhì)響應(yīng)診斷技術(shù)[J]. 中國(guó)電機(jī)工程學(xué)報(bào),2012,32(33):133-140.
[8] 貢春艷. 極化去極化電流法和回復(fù)電壓法融合的油紙絕緣老化狀態(tài)評(píng)估[D]. 重慶:重慶大學(xué),2013.
[9] 李軍浩,司文榮,姚秀,等. 油紙絕緣變壓器老化狀態(tài)評(píng)估的極化/去極化電流技術(shù)研究[J]. 儀器儀表學(xué)報(bào),2009,30(12):2605-2611.
[10] 張濤. 基于回復(fù)電壓特征量的變壓器油紙絕緣狀態(tài)診斷研究[D]. 福州:福州大學(xué),2010.
[11] 白吉昌,王林,彭永洪,等. 應(yīng)用極化/去極化電流法評(píng)估變壓器油紙絕緣水分含量[J]. 電氣開關(guān),2014,52(3):98-102.
[12] 王林. 基于時(shí)域介質(zhì)響應(yīng)法的變壓器油紙絕緣水分含量研究[D]. 成都:西南交通大學(xué),2013.
[13] 白錦軍,萬(wàn)子逸,白添凱,等. 熱老化對(duì)變壓器油紙絕緣介電響應(yīng)特征參量影響的研究[J]. 云南電力技術(shù),2016,44(3):4-13.
[14] 王世強(qiáng),胡海燕,肖睿,等. 油老化對(duì)油紙絕緣時(shí)域介電特性影響的實(shí)驗(yàn)研究[J]. 高壓電器,2014,50(5):110-114.