纳米Al_2O_3对低密度聚乙烯高压直流电缆绝缘材料性能影响研究  

Effect of Nano-Al_2O_3 on Insulating Properties of Low-density Polyethylene Nanocomposites for HVDC Cables

作　　者：王思蛟 查俊伟[1] 王俊甫[1] 党智敏[2] WANG Sijiao ZHA Junwei WANG Junfu DANG Zhimin(Department of Polymer Science and Engineering, University of Science ＆ Technology Beijing, Haidian District, Beijing 100083, China State Key Laboratory of Control and Simulation of Power System and Generation Equipment（Department of Electrical Engineering, Tsinghua University）, Haidian District, Beijing 100084, China)

机构地区：[1]北京科技大学高分子科学与工程系,北京市海淀区100083 [2]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084

出　　处：《中国电机工程学报》2016年第24期6613-6618,共6页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973计划)(2014CB239503);国家自然科学基金项目(51622701)~~

摘　　要：选用纳米Al_2O_3粒子作为填料,通过熔融共混法制备出不同填料质量分数(0.1%、0.2%、0.5%、1%)的低密度聚乙烯纳米复合材料。利用电声脉冲法研究了室温下纳米复合材料在30k V/mm场强中空间电荷分布及场强畸变特性,并测量了固定场强中不同温度下的直流电导率和室温下不同场强中材料的电导率变化。结果表明,当纳米粒子添加量为1%时,能有效改善聚乙烯中电荷积聚和场强的畸变现象,并降低聚乙烯的直流电导率。同时发现不同场强下,不同含量的聚乙烯纳米复合材料的直流电导率,随温度变化趋势不同。Low-density polyethylene （LDPE） nano- composites filled with alumina nanoparticles （nano-A1203） with mass fraction of 0.1%, 0.2%, 0.5% and !% were prepared employing the melting blend method. Space charge profiles and electric field distortion characteristics of LDPE nanocomposites under the electric field of 30 kV/mm at room temperature were measured by the pulse electro-acoustic method. Effects of temperature and electric fields on direct current （DC） conductivity of the nanocomposites were also studied. Results show that 1% A1203 nanoparticles added into LDPE can effectively improve the charge accumulation and field distortion in the LDPE nanocomposites and reduce DC conductivity. Moreover, the DC conductivities of LDPE nanocomposites have different temperature trends under different electric fields.

关 键 词：纳米氧化铝 低密度聚乙烯 空间电荷 直流电导率 

分 类 号：TM76[电气工程—电力系统及自动化]