直流电晕下环氧绝缘材料的表面电荷特性

发布时间：2018-01-16 02:17

本文关键词：直流电晕下环氧绝缘材料的表面电荷特性　出处：《智能电网》2016年11期 　论文类型：期刊论文

【摘要】：环氧树脂广泛应用于电力系统中,其表面电荷的积累和衰减行为已成为制约众多高压直流电力设备研制的关键问题。薄片状介质试样的表面电荷密度与表面电位近似呈线性关系,因此,常通过表面电位衰减行为研究表面电荷的衰减特性。基于栅控负直流电晕充电方法,采用纯环氧试样及几种环氧纳米复合试样,研究环氧树脂的表面电位衰减特性。结果表明:随着栅极电压的增大,环氧树脂表面电位的衰减速度逐渐加快,并在约?8 k V处开始出现"交叉"现象;随电晕时间的增长,环氧树脂表面电位的衰减速度逐渐加快,并在约480 s处达到稳定;环氧树脂的表面电位衰减速度与ε/γ成线性关系,即与介电常数ε成反比、与体电导率γ成正比。
[Abstract]:Epoxy resin is widely used in power system. The accumulation and attenuation behavior of surface charge has become a key problem that restricts the development of many HVDC power equipment. The surface charge density of thin dielectric sample is approximately linear with the surface potential. Based on the gate controlled negative DC corona charging method, pure epoxy samples and several kinds of epoxy nanocomposite samples are used. The surface potential attenuation characteristics of epoxy resin are studied. The results show that the decay rate of surface potential of epoxy resin increases with the increase of gate voltage, and the decay rate of epoxy resin surface potential increases with the increase of gate voltage. The phenomenon of "crossing" began to appear at 8kV; With the increase of corona time, the decay rate of surface potential of epoxy resin was accelerated gradually and stabilized at about 480 s. The decay rate of surface potential of epoxy resin is linear with 蔚 / 纬, that is, it is inversely proportional to dielectric constant 蔚 and directly proportional to bulk conductivity 纬.
【作者单位】：全球能源互联网研究院;电力设备电气绝缘国家重点实验室(西安交通大学);
【分类号】：TM21
【正文快照】： 0引言聚合物介质因其优异的电气、热和力学等性能,广泛应用于电力设备中[1]。随着特高压直流输电技术快速发展,电力系统对高压直流电力设备的需求日益迫切。研究表明[2-3],直流电场下聚合物介质表面易于积累电荷,并且在很长时间内都无法消散,不仅使材料的表面电场严重畸变,还

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