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ReaxFF MD investigation on the damage mechanism of epoxy polymer exposed to DC corona discharge in SF6 gas

Wang, Jingrui, Li, Qingmin, Liu, Heng, Liu, Zhipeng, Haddad, Manu A., Jiang, Yuheng, Wang, Weilan, Wang, Changzhu and Li, Xuan 2022. ReaxFF MD investigation on the damage mechanism of epoxy polymer exposed to DC corona discharge in SF6 gas. Presented at: International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO), Beijing, China, 15-17 Oct 2021. Proceedings International Conference on Advanced Electrical Equipment and Reliable Operation (AEERO). IEEE, 10.1109/AEERO52475.2021.9708353

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Abstract

Corona discharge fault is inevitable in high voltage direct current gas insulated switchgear and gas insulated transmission-line (HVDC GIS/GIL), which will cause irreversible damage to the insulation strength of surface for the casting epoxy insulator. This research conducts a joint investigation of experiment and simulation on the damage mechanism of epoxy polymer exposed to DC corona discharge in SF 6 gas. A corona erosion test platform for epoxy polymer was established. Combined with microscopic morphology test, element analysis and macroscopic roughness test, the surface damage characteristics of epoxy resin under corona erosion in SF 6 were mastered in the experimental study. Furthermore, the molecular dynamics model of the polymer under SF 6 decomposition products bombardment was constructed based on the developed reactive force-field (ReaxFF) for SFO system. Through comparing the effects of four featured particles, F, SF, OH and SOF, bombardment, it was found that SF particles is the most destructive for epoxy polymer. Specifically, the mass loss and damage penetration depth of epoxy resin system were the highest. This simulation study based on molecular dynamics (MD) not only elucidates the mechanism of corona damage to epoxy resin and explains the physical phenomenon, but also provides a universal and novel method to study the damage and erosion effect of corona on dielectrics.

Item Type: Conference or Workshop Item (Paper)
Date Type: Published Online
Status: Published
Schools: Engineering
Publisher: IEEE
ISBN: 9781665402651
Last Modified: 24 Mar 2022 12:30
URI: https://orca.cardiff.ac.uk/id/eprint/148406

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