钛酸铜钙/硅橡胶复合介质电性能及仿真分析  

Electrical Properties and Simulation Analysis of Copper Calcium Titanate/Silicone Rubber Composite

作　　者：魏力强 张鹏 李艳辉 高承华 李振 WEI Liqiang;ZHANG Peng;LI Yanhui;GAO Chenghua;LI Zhen(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;Shenzhen Woer Heat-shrinkable Material Co.,Ltd.,Shenzhen 518118,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [2]深圳市沃尔核材股份有限公司,广东深圳518118

出　　处：《绝缘材料》2021年第7期25-30,共6页Insulating Materials

基　　金：国网河北省电力有限公司科技项目(kj2019-059)。

摘　　要：为了获得兼具良好电阻率非线性特性和较高击穿特性的硅橡胶复合介质,制备了钛酸铜钙(CCTO)陶瓷粉体,按体积分数分别为3%、5%、10%掺入双组分液体硅橡胶中,分别获得纯硅橡胶和不同CCTO掺入量的CCTO/硅橡胶复合介质。对该复合介质进行微观结构表征、介电谱特性测试、直流击穿性能测试、直流非线性电阻率测试,最后通过建立高压直流电缆终端仿真模型,对复合介质的应用性能进行对比。结果表明:CCTO陶瓷粉体特征衍射峰明显,粉体粒径约为500 nm;随着CCTO陶瓷粉体掺入量的增加,CCTO/硅橡胶复合介质的介电常数随之增加,直流击穿强度下降,电阻率非线性特性明显增强;随着电阻率非线性特性的增强,电缆终端应力锥增强绝缘中的电场强度下降明显,当复合介质中CCTO陶瓷粉体体积分数为5%和10%时,复合介质可作为高压直流电缆附件应力锥的增强绝缘材料。In order to obtain a silicone rubber composite with both good resistivity nonlinear characteristics and high electric breakdown characteristics,a copper calcium titanate(CCTO)ceramic powder was prepared,and the CCTO was mixed with two-component liquid silicone rubber to prepare CCTO/silicone rubber composite(the volume fraction of CCTO ceramic powder was 3%,5%,and 10%,respectively).Their microstructure,dielectric spectrum characteristics,DC breakdown performance,and DC nonlinear resistivity were tested,and their application performance was compared by establishing a high-voltage DC cable terminal simulation model.The results show that the CCTO ceramic powder has obvious characteristic diffraction peaks,and the powder particle size is about 500 nm;with the increase of CCTO ceramic powder content,the dielectric constant of the CCTO/silicone rubber composite increases,the DC breakdown strength decreases,and the non-linear characteristics of resistivity are significantly enhanced.With the enhancement of the nonlinear characteristics of resistivity,the electric field strength in the reinforced insulation of cable terminal stress cone decreases significantly.When the volume fraction of CCTO ceramic powder in the composite is 5%or 10%,the composite can be used as a reinforced insulating material of stress cone for high voltage DC cable accessory.

关 键 词：电阻率非线性 钛酸铜钙 硅橡胶 仿真分析 

分 类 号：TM215.2[一般工业技术—材料科学与工程]