环氧树脂材料热氧老化特性研究  

Study on Thermo-Oxygen Aging Characteristics of Epoxy Resin Material

作　　者：谢伟 杨征 程显[2,3] 李文博 陈硕[2,3] Xie Wei;Yang Zheng;Cheng Xian;Li Wenbo;Chen Shuo(Henan Engineering Research Center of Power Transmission&Distribution Equipment and Electrical Insulation,Zhengzhou 450001 China;School of Electrical Engineering Zhengzhou University,Zhengzhou 450001 China;State Grid Henan Electric Power Company Electric Power Research Institute,Zhengzhou 450001 China)

机构地区：[1]国网河南省电力公司电力科学研究院,郑州450001 [2]郑州大学电气工程学院,郑州450001 [3]河南省输配电装备与电气绝缘工程技术研究中心,郑州450001

出　　处：《电工技术学报》2020年第20期4397-4404,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51977195);中国博士后科学基金(2017M622370)资助项目。

摘　　要：随着以环氧树脂为主绝缘介质的电气设备的推广,环氧树脂的绝缘劣化问题受到广泛关注。为研究环氧树脂在热积累作用下所产生的绝缘劣化问题,展开热氧老化试验研究。结果表明:热质量损失率随老化时间均匀变化,可较好地预测使用寿命;局部放电量(PD)、介质损耗角正切值(tanδ)、相对介电常数(εr)均呈现分段式变化趋势,体积电阻(Ωr)仅在临近老化终点显著下降;醚键的大量断裂是导致材料绝缘失效的主要原因;环氧树脂随老化时间的增加,表面分裂形成颗粒状物质,裂隙增多,间距加大,为环氧树脂的绝缘状态监测提供参考。With the popularization of electrical equipment that uses epoxy resin as the main insulating medium,the insulation degradation of epoxy resin has been widely concerned.In order to study the insulation degradation caused by epoxy resin under thermal accumulation,thermal oxygen aging test was carried out.The results show that the thermal mass loss changes uniformly with aging time,and the service life can be predicted well.Partial discharge(PD),dielectric loss angle tangent(tanδ)and relative permittivity(εr)all show a piecewise trend,while the resistance(Ωr)only decreases significantly near the end of aging.Ether cleavage is the main cause of material insulation failure.As the aging time increases,the surface of the epoxy resin splits to form granular materials,the cracks increase,and the spacing increases,which provides a reference for insulation status monitoring of epoxy resin.

关 键 词：环氧树脂 绝缘参数 热氧老化 绝缘状态监测 

分 类 号：TM215[一般工业技术—材料科学与工程]