Microstructure Evolution of Silicone Rubber Used for Composite Insulators under the Effects of Electric Field and Temperature
Liang Ying1, Gao Ting2, Wang Xiangnian2, Sun Mengting2
1. School of Physics and Electronic-Electrical Engineering Ningxia University Yinchuan 750021 China; 2. Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding 071003 China
Abstract：The inner temperature of UHV composite insulators is higher during their field operation. And the temperature may also be elevated be more higher when the partial discharge occurs. Then the aging of silicone rubber used for composite insulators will be more prominent under the action of strong electric field and high temperature. As we all know, the fine degradation process of SIR is difficult to be assessed with macroscopic characteristics. Therefore, it is necessary to study the micro-structural evolution of high temperature vulcanized silicone rubber under the synergistic effects of high temperature and electric field. In this paper, the molecular model of high temperature vulcanized silicone rubber has been constructed according to its actual parameters and the main reactions in silicone rubber. Based on the principle of molecular dynamics, the structural evolution for the built molecular model has been followed performed. While the micro-characteristic changes of silicone rubber under the synergistic effects of electric field and temperature have been explored. And the mechanical properties of silicone rubber have been further studied. It is found that the electric field has a significant effect on the bond length of the main chain, but the temperature has a significant effect on the bond angle and the chemical bond length of the cross-linking structure. The increase of temperature can soften the texture of silicone rubber and reduce the mechanical properties. However, the increase of electric field intensity makes the texture of silicone rubber hard and improves its mechanical properties. The research results can provide references for the optimization of composite insulator substrates from the micro level, as well as the correlation between micro and macro-characteristics of silicone rubber.
梁英, 高婷, 王祥念, 孙孟婷. 电场和温度协同作用下复合绝缘子用硅橡胶微观结构演化[J]. 电工技术学报, 2020, 35(7): 1575-1583.
Liang Ying, Gao Ting, Wang Xiangnian, Sun Mengting. Microstructure Evolution of Silicone Rubber Used for Composite Insulators under the Effects of Electric Field and Temperature. Transactions of China Electrotechnical Society, 2020, 35(7): 1575-1583.
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2020, Vol. 35 
