多场耦合对直流环氧绝缘材料机械性能和热性能的影响  

Influence of Multi-Field Coupling on Mechanical and Thermal Properties of DC High-Voltage Epoxy Insulating Materials

作　　者：吴明清 田浩 侯国良 侯亚峰 袁端鹏 林生军 

机构地区：[1]河南平高电气股份有限公司,河南省平顶山市467001 [2]国家电网高压开关设备绝缘材料实验室(平高集团有限公司),河南省平顶山市467001 [3]平高集团有限公司,河南省平顶山市467001

出　　处：《电网技术》2015年第10期2947-2951,共5页Power System Technology

基　　金：国家863高技术基金项目(2014AA051802);国家电网公司科技项目(PGKJ2014-045)~~

摘　　要：为研究直流电场、温度场、力场等多场耦合条件下,环氧绝缘材料机械性能和热性能的变化规律,采用直流试验装置对多场耦合条件下环氧绝缘材料的弯曲强度值,以及玻璃化转变温度分布进行了测量,并采用电容探头法,测量其表面电荷分布情况。通过相关理论研究,发现多场耦合条件下环氧绝缘材料弯曲强度随时间对数呈现二次关系并迅速降低,表面电荷的存在加速了环氧绝缘材料的老化作用。研究结论为评价环氧绝缘材料在多场耦合条件下的长期运行特性提供了依据。HVDC test device has been used to measure flexural strength variations and glass transition temperature distribution of epoxy insulating materials under multi-field coupling of HVDC electric field, temperature field and mechanical force field. Capacitance probe method is used to observe its surface charge distribution to study influence of multi-field coupling on mechanical and thermal properties variations of epoxy insulating materials. Quadratic relationship between flexural strength of epoxy insulating materials and service time is discovered with theoretical research. It leads to rapid decline of flexural strength, and effect of physical aging is enhanced due to surface charge. A basis for long time properties evaluation of epoxy insulating materials under multi-field coupling is provided iri research conclusion.

关 键 词：多场耦合 直流环氧绝缘材料 弯曲强度 玻璃化转变温度 表面电荷分布 

分 类 号：TM85[电气工程—高电压与绝缘技术]