摘要
表面粗糙度作为反映材料表面状态的重要参数,与材料的真空沿面闪络特性有着密切的联系。为研究表面粗糙度对聚合物材料真空闪络特性的影响规律及影响机制,采用不同目数的砂纸制备了不同表面粗糙度的聚四氟乙烯、有机玻璃和聚酰胺样品,测量不同粗糙度样品的表面绝缘关键参数,如表面形貌、表面电位、陷阱参数及二次电子发射系数;开展不同粗糙度样品的真空沿面闪络实验。对打磨前后样品表面参数的分析结果表明:表面粗糙度对样品表面电位及陷阱参数的影响与粗糙度范围及材料种类有关,同时,表面粗糙度对材料的二次电子发射系数也有一定的影响。在一定范围内提高材料表面粗糙度能够提高材料的真空沿面耐压,真空耐压的提高和材料表面的电荷衰减、陷阱能级及二次电子发射特性均直接相关。实验结果可为分析材料表面状态对沿面绝缘的影响及材料的改性提供一定的参考。
As an important factor of the surface state,the surface roughness is closely related to vacuum flashover.In order to investigate the influence of surface roughness on flashover characteristic of polymer materials and its influence mechanism,the polytetrafluoroethylene(PTFE),polymethylmethacrylate(PMMA)and polyamide 6(PA6)samples with different surface roughness prepared with different meshes of sandpapers were used.The key surface parameters of the samples were measured,such as the morphology,surface potential,surface trap parameters,and the secondary electron emission yield(SEY).The flashover experiments of different roughness samples were carried out in vacuum.The analysis of the sample surface parameters before and after grinding shows that the influence of surface roughness on the surface potential and trap parameters is related to the roughness range and material type.Besides,the surface roughness has a certain influence on the SEY.Increasing the roughness of materials within a certain range can improve the flashover voltage in vacuum,which is directly related to the surface charge dissipation,trap level and SEY characteristics of insulating materials.The experimental results can provide a reference for analyzing the influence of surface factors on the surface insulation characteristics and material modification.
作者
胡多
任成燕
孔飞
严萍
邵涛
Hu Duo;Ren Chengyan;Kong Fei;Yan Ping;Shao Tao(Key Laboratory of Power Electronics and Electric Drive Institute of Electrical EngineeringChinese Academy of Sciences Beijing 100190 China;University of Chinese Academy of Sciences Beijing 100049 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2019年第16期3512-3521,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金项目(51477163,U1830135,51807189)
中国科学院科研仪器设备研制项目(YJKYYQ20170004)资助
关键词
真空闪络
表面粗糙度
陷阱
二次电子
聚合物
Vacuum flashover
surface roughness
trap
second electron
polymer
