Experimental Study on Surface Flashover of PMMA Driven by DC Voltage at Atmospheric Pressure

doi:10.11930/j.issn.1004-9649.2016.09.041.05

Abstract

Abstract: In order to study the phenomenon of surface flashover and its influence on the insulation material under DC condition, surface discharge experiments on PMMA surface are carried out with different electrode distances. The surface morphology, contact angle and surface composition of material are analyzed. The results show that lilac corona occurs near electrodes during discharge process. Flashover arc fluctuation and intensity increase with discharge distance. Discharge mark is formed between electrodes after discharge. The mark is more obvious at locations closer to cathode side. Material surface becomes muddy with increase number of discharge. Roughness is increased, and water contact angle decreases too. After discharge, C1s content is decreased, however O1s content is increased. A large number of C-C bonds are broken to generate C-O bond, O-C=O bond and other hydrophilic groups which increase material hydrophilicity. The analysis of this paper shows that the surface micro topography and surface elements have a certain influence on the flashover voltage, and it has a certain guiding significance to improve the flashover voltage.

Key words: electrode distance, insultion, DC power, poly methyl methacrylate, surface discharge, physical and chemical characteristics

CLC Number:

TM89

WANG Tao, XU Yuqin, ZHAO Yimin, HU Zhiliang, ZHAO Beibei, XIE Qing, WANG Chuan. Experimental Study on Surface Flashover of PMMA Driven by DC Voltage at Atmospheric Pressure[J]. Electric Power, 2016, 49(9): 41-45.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2016.09.041.05

https://www.electricpower.com.cn/EN/Y2016/V49/I9/41

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