环氧及其复合材料在变压器油中的快脉冲闪络特性  

Flashover Property of Epoxy Resin and Epoxy Composites under Fast Pulse in Transformer Oil

作　　者：卢为[1] 成永红[1] 王增彬[1] 陈玉[1] 吴锴[1] 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049

出　　处：《西安交通大学学报》2010年第10期83-87,共5页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金重点资助项目(50437030);国家自然科学基金资助项目(10876024);国家"863计划"资助项目(2007AA04Z412)

摘　　要：研究了纳秒级高压脉冲作用下环氧及其复合材料在变压器油中的沿面闪络特性,发现由于多次闪络引起材料表面的破坏和杂质的积累,致使环氧树脂的闪络电压随着闪络次数的增加显著降低,并且随着液压的增加,液体中的气泡运动受到阻碍,闪络电压有明显的升高.对脉冲陡度和沿面闪络电压的关系进行了拟合和外推,发现采用肖特基效应方程的倒数形式可得到较好的拟合效果.不同填料含量的微米TiO2/环氧复合材料的闪络电压随着w(TiO2)的增加呈现"V"形变化趋势,并在w(TiO2)约为20%时出现最低值.The flashover characters under nanosecond pulsed voltage in transformer oil of epoxy resin and epoxy composites are reported.It is indicated that the flashover voltage of epoxy resin decreases while flashover times increase,and the surface damage and impurities caused by multiple flashovers are considered to be the reason.The movement of bubbles is restricted when liquid pressure increases,so the flashover voltage increases evidently.The relationship between pulse steepness and the flashover voltage is fit and extrapolated,and the fit result based on the reciprocal form of Schottky effect equation is preferable.In addition,the research of Micro TiO2/epoxy composite samples with different filler weight percent demonstrates that while the weight percent of TiO2increases the flashover voltage varies as a＇V＇style,and the lowest voltage value is obtained when the filler weight gets about 20%.

关 键 词：闪络 纳秒脉冲 变压器油 环氧 

分 类 号：TM855[电气工程—高电压与绝缘技术]