Influence of the Roughness on Surface Flashover of Polymer Materials in Vacuum
Hu Duo1,2, Ren Chengyan1,2, Kong Fei1, Yan Ping1,2, Shao Tao1,2
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China; 2. University of Chinese Academy of Sciences Beijing 100049 China
Abstract：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.
胡多, 任成燕, 孔飞, 严萍, 邵涛. 表面粗糙度对聚合物材料真空沿面闪络特性的影响[J]. 电工技术学报, 2019, 34(16): 3512-3521.
Hu Duo, Ren Chengyan, Kong Fei, Yan Ping, Shao Tao. Influence of the Roughness on Surface Flashover of Polymer Materials in Vacuum. Transactions of China Electrotechnical Society, 2019, 34(16): 3512-3521.
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2019, Vol. 34 
