Aging Characteristics of Silicone Rubber for Composite Insulators Under Temperature Irradiation Stress

Clean energy transmission is predominant in highaltitude areas, and in order to achieve the development and transmission of clean energy, a large number of composite insulators are needed. However, the harsh environment in highaltitude areas can accelerate the aging of composite insulators. This article uses an artificial aging test platform to conduct coupled aging tests. Through surface flashover, mechanical testing, thermogravimetric analysis, and Fourier transform infrared spectroscopy analysis of silicone rubber samples with different test cycles, the performance degradation law and failure mechanism of silicone rubber under coupled environment are studied. The results showed that the surface flashover voltage and mechanical properties of silicone rubber decreased, mass fraction first increased and then decreased, and the characteristic peak areas of the main chain and side chains decreased; The interface between the matrix and the filler is damaged, and the trihydrate aluminum filler and white carbon black filler precipitate from the silicone rubber matrix, reducing the organic components and affecting the high temperature resistance, cold resistance, and UV resistance of the silicone rubber, thereby reducing its electrical and mechanical properties. To provide useful reference for the study of aging failure mechanism of inservice composite insulators considering the influence of temperature and irradiation environment.