拉伸状态下LDPE/SiO_2改性材料的空间电荷特性研究  

Study on Space Charge Behavior in LDPE/SiO_2 Nanocomposites Under Tensile Condition

作　　者：王灿[1] 王有元[1] 凡朋 廖瑞金[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400030

出　　处：《中国电机工程学报》2016年第4期1163-1170,共8页Proceedings of the CSEE

基　　金：输配电装备及系统安全与新技术国家重点实验室自助研究课题(2007DA10512713205)~~

摘　　要：为深入研究低密度聚乙烯(low-density polyethylene,LDPE)/Si O_2改性材料内部空间电荷的运动特性,利用纳米粒径分别为15和50 nm的Si O_2纳米粒子制备了质量分数为5%的LDPE/Si O_2改性材料,同时制备了拉伸率为10%的样品,利用电声脉冲(pulsed electroacoustic apparatus,PEA)法装置测量了每种样品的空间电荷分布。结果表明:添加Si O_2纳米粒子后,材料中靠近电极处的空间电荷累积由异极性电荷转变为同极性电荷;拉伸后,所有材料内部的空间电荷累积量均出现了增加,并且当拉伸率为10%,质量分数为5%时,LDPE/Si O_2改性材料内部出现了空间电荷大量累积的现象,在材料中心位置处形成了两个不同极性的空间电荷包,15nm粒径改性材料的空间电荷包远小于50nm粒径的改性材料。文中从弧波理论、电荷在改性材料中的受力以及具有不同介电常数材料表面电荷的累积等方面对LDPE/Si O_2改性材料内部的空间电荷包现象进行了详细解释,为深入理解空间电荷在改性材料中的运动特性和分布特性提供参考。In order to research space charge behavior in low-density polyethylene （LDPE）/SiO2 nanocomposites, this paper prepared LDPE/SiO2 nanocomposites with particle size of 15nm and 50nm, mass fraction of 5% and elongation of 10%. Space charge behavior of each sample was tested by pulsed electroacoustic apparatus （PEA） method. The results show that homoeharge accumulation changes to hetercharge accumulation near electrodes in LDPE/SiO2 nanocomposites when nanoparticles were added. The amount of space charge increases under tensile condition. There is a large amount of space charge in nanocomposites with elongation of 10% and nanoparticles＇ mass fraction of 5%. At the same time, there are two different polarity packet-like space charges in the center of nanocomposites and the packet-like space charge in nanocomposites with particle size of 50nm is more obvious than that in nancomposites with particle size of 15nm. This paper explains packet-like space charge by using solitary wave theory, force stressed on charges in nanocomposites and surface charge accumulation of nanocomposites with different dielectric constant, which provides reference for the motion characteristics and distribution characteristics of space charge in nanocomposites.

关 键 词：LDPE/SiO2改性材料 空间电荷包 拉伸率 孤波理论 表面电荷累积 

分 类 号：TM85[电气工程—高电压与绝缘技术]