Study on the Microscopic Properties of Ethylene-propylene-diene Monomer and Its Effect on Surface Discharge Under External Electric Field
LI Yasha1,2,*, GUO Yujie1,2, XIA Yu3, WANG Jiamin1,2, YAN Xinyue1,2, CHEN Junzhang1,2
1 College of Electrical and New Energy, China Three Gorges University, Yichang 443002, Hubei, China 2 Hubei Provincial Engineering Technology Research Center for Power Transmission Line, Yichang 443002, Hubei, China 3 EHV Power Transmission Company, State Grid Jibei Electric Power Co., Ltd., Beijing 102488, China
Abstract: Ethylene-propylene-diene monomer (EPDM), as a functional material, has attracted much attention in the field of medium and high voltage cable insulation. However, the actual service environment is harsh, and the surface discharge phenomenon occurs occasionally. In order to study the surface discharge characteristics of ethylene-propylene-diene monomer from the microscopic level, the density functional theory was used to analyze the molecular geometry, orbital energy levels, trap depth, density of states, electrostatic potential, excited state and other microscopic properties. The calculated results show that with the increase of electric field, the EPDM molecular chain extends and straightens gradually, and the dipole moment gradually increases to 8.164 D. The region near the third monomer gradually evolves into electron traps, and the trap depth decreases from 0.740 eV to 0.043 eV with the increase of electric field, and their number increases. The electrophilicity of carbon-carbon double bond makes the electrons in the third monomer region more active, which easily aggravates the development of electron avalanche. With the increase of external electric field, the excitation energy of EPDM molecular chain decreases gradually, and the absorption peak is red shifted, and electrons are easily excited at this time. The third monomer region is the main excitation region. When the excited electrons return to the ground state orbit, they will release photons, which is easy to form space photoionization in the surface gas, and induce the occurrence of surface discharge.
李亚莎, 郭玉杰, 夏宇, 王佳敏, 晏欣悦, 陈俊璋. 外电场下三元乙丙橡胶微观特性及其对沿面放电影响的研究[J]. 材料导报, 2024, 38(23): 23070060-8.
LI Yasha, GUO Yujie, XIA Yu, WANG Jiamin, YAN Xinyue, CHEN Junzhang. Study on the Microscopic Properties of Ethylene-propylene-diene Monomer and Its Effect on Surface Discharge Under External Electric Field. Materials Reports, 2024, 38(23): 23070060-8.
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