以电场遮蔽效应理解交联聚乙烯丛状电树滞长过程
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摘要
为了研究丛状电树生长过程中的滞长现象,对XLPE薄片进行电树培养与实时观测实验,并从电场角度分析丛状电树各个阶段的生长过程。通过对XLPE薄片内设置针-板电极培养稳定的丛状电树,利用实时微观观测与局部放电监测技术记录电树各阶段特征,并对不同密度电树枝建立有限元电场模型,分析不同电树形态下的电场特点。结果表明:电树枝在变密集后,相互之间存在明显的电场遮蔽效应,致使电树滞长,滞长期后的新生电树往往从树枝稀疏区域开始生长。
To study the growth retardation of plexiform electric trees in cross-linked polyethylene(XLPE),XLPE slice samples were observed in real time when the electric trees were growing, and the growth process of plexiform trees was analyzed through the angle of electric field. The stable plexiform electric trees were generated by using the needle-plate electrodes, and the real-time microscope digital imaging and partial discharge measurement were used to record the growth process of the electric trees. Finite element models of electric field were built for electric trees of different density, and the electric field characteristics of electric trees in different shapes were analyzed. The result show that when the electric trees become dense, there is an obvious electric field shielding effect among the electric trees and it hinders the growth of electric trees. New electric trees tend to grow from the sparse branches area after the growth retardation.
To study the growth retardation of plexiform electric trees in cross-linked polyethylene(XLPE),XLPE slice samples were observed in real time when the electric trees were growing, and the growth process of plexiform trees was analyzed through the angle of electric field. The stable plexiform electric trees were generated by using the needle-plate electrodes, and the real-time microscope digital imaging and partial discharge measurement were used to record the growth process of the electric trees. Finite element models of electric field were built for electric trees of different density, and the electric field characteristics of electric trees in different shapes were analyzed. The result show that when the electric trees become dense, there is an obvious electric field shielding effect among the electric trees and it hinders the growth of electric trees. New electric trees tend to grow from the sparse branches area after the growth retardation.
引文
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[11]周远翔,张云霄,陈铮铮,等.机械应力对硅橡胶电树枝起始性能的影响[J].绝缘材料,2017,50(2):53-57.
[2]周远翔,聂琼,邢晓亮,等.频率对高密度聚乙烯电树老化特性的影响[J].高电压技术,2008,34(2):220-224.
[3]陈仕军.不同条件下交联聚乙烯电缆电树枝生长特性研究[D].重庆:重庆大学,2009.
[4]周远翔,王一男,邢晓亮,等.频率对聚乙烯电树起始的影响特性研究[J].高电压技术,2007,33(4):138-142.
[5]郑晓泉,CHEN G,DAVIES A E.交联聚乙烯电缆绝缘中的双结构电树枝特性及其形态发展规律[J].中国电机工程学报,2006,26(3):79-85.
[6]DING H Z,VARLOW B R.Thermodynamic model for electrical tree propagation kinetics in combined electrical and mechanical stresses[J].IEEE Transactions on Dielectrics and Electrical Insulation,2005,12(1):81-89.
[7]郑晓泉,CHEN G,DAVIES A E.交联聚乙烯电缆绝缘中的导电和非导电型电树枝[J].中国电机工程学报,2004,24(3):140-144.
[8]陈向荣,徐阳,徐杰,等.工频电压下110k V级XLPE电缆绝缘中电树枝生长阶段特性[J].电工电能新技术,2010,29(3):39-43.
[9]喻岩珑,吴延坤,陈广辉,等.不同工频电压下110k V级XLPE电缆绝缘中电树枝生长情况与局放特征[J].电网与清洁能源,2011,27(12):14-18.
[10]周利军,仇祺沛,成睿,等.不同温度下局部气压对XLPE电缆电树枝生长及局放特性的影响[J].中国电机工程学报,2016,36(18):5094-5102.
[11]周远翔,张云霄,陈铮铮,等.机械应力对硅橡胶电树枝起始性能的影响[J].绝缘材料,2017,50(2):53-57.