Under the influence of environmental factors, various physical and chemical changes occur in organic materials, which deteriorates performance. The combination of electric field, mechanical load and environmental factors will further aggravate the deterioration process. Studies have shown that the surface discharge and corona discharge caused by ultraviolet light, acid rain and pollution under wet conditions are the main factors affecting the aging of composite insulator outer insulation materials, and the effect of surface discharge is the most significant.

    The shed skirt material of the composite insulator in operation will exhibit different degrees of aging, such as water repellency, leakage or electrical erosion, cracking, cracking, chalking, fading, and the like. In fact, some changes in the material of the shed skirt do not hinder the continued use of the composite insulator, such as ochre; other degradation phenomena will not pose a threat to the safe operation of the insulator for a long time, such as powdering and varnishing. hard.