环氧树脂/SiO2纳米复合材料陷阱分布及直流闪络特性  

Trap Distribution and DC Flashover Characteristics of Epoxy Resin/SiO2 Nanocomposites

作　　者：李群[1] 赵宇民 陈天恒[2] 金元[1] 张晓天[1] 覃杰 LI Qun;ZHAO Yumin;CHEN Tianheng;JIN Yuan;ZHANG Xiaotian;QIN Jie(Northeast Branch of State Grid of China, Shenyang 110180, China;State Grid Tianjin Electric Power Company, Tianjin 300010, China;Beijing Huadian Borui Power Automation Engineering Technology Co., Ltd., Beijing 102600, China)

机构地区：[1]国家电网公司东北分部,沈阳110180 [2]国网天津市电力公司,天津300010 [3]北京华电博瑞电力自动化工程技术有限公司,北京102600

出　　处：《南方电网技术》2019年第6期57-63,共7页Southern Power System Technology

基　　金：国家电网公司科技项目(DZB11201704958)~~

摘　　要：气体绝缘管道输电和气体绝缘组合电器运行过程中盆式绝缘子表面电荷的积累与消散特性对其绝缘破坏具有重要影响,通过纳米颗粒调控环氧树脂表面电荷的动态行为及其闪络特性对提高其安全运行具有重要意义。制备了质量分数为0%、2%、4%、6%和8%的环氧树脂/SiO2纳米复合材料,获得了其在正、负直流电压作用下表面电位衰减特性、陷阱分布特性及其闪络击穿特性,并建立了基于陷阱调控的闪络击穿失效物理模型。结果表明:正、负电晕充电条件下,SiO2纳米颗粒均导致环氧树脂表面电位衰减速度减小,纳米质量分数为4%时达到最小值;SiO2纳米颗粒引入了新的空穴陷阱和电子陷阱,深陷阱能级和陷阱密度均增加,纳米质量分数为4%时达到最大值;SiO2纳米颗粒提高了环氧树脂的闪络电压,质量分数为4%的纳米复合材料与纯环氧树脂相比,正、负直流电压下闪络电压分别提升了58.04%和64.15%。The accumulation and dissipation of surface charges play an important role in the insulation failure of the disc-type insulator in the gas insulated transmission line (GIL) and gas insulated switchgear(GIS). Introducing nanoparticles into epoxy resin to modulate dynamic behaviors of the surface charges and improve the flashover voltage is of great significance to ensure the safe operation of GIL and GIS. In this paper, epoxy resin/SiO 2 nanocomposites with mass fraction of 0%, 2%, 4%, 6% and 8% are prepared. With positive and negative DC voltages, the surface potential decaying process, trap distribution behaviors and flashover characteristics are obtained, a physical model of insulation failure is established based on modulating the trap distribution. The results show that the surface potential decaying rate is reduced with both positive and negative corona charging as the nano-SiO 2 is filled into epoxy resin, the minimum value is in the samples with the mass fraction of 4%. New hole and electron traps are introduced into epoxy resin by SiO 2 nanoparticles, which are with larger trap energy level and trap density, the maximum value is in the samples with the mass fraction of 4%. The flashover voltage of the specimen is enhanced by SiO 2 nanoparticles. Compared with pure epoxy resin, the flashover voltage of epoxy resin/SiO 2 nanocomposites with the mass fraction of 4% are respectively increased by 58.04% and 64.15% with positive and negative DC voltage.

关 键 词：环氧树脂 纳米SIO2 表面电荷 陷阱能级 闪络电压 

分 类 号：TM21[一般工业技术—材料科学与工程]