Analysis of aging status of silicone rubber insulation material and research progress of its repair countermeasures

Abstract

Due to its good hydrophobicity and hydrophobicity migration, silicone rubber can be used as umbrella sheath of insulators. With the continuous deterioration of environmental conditions, silicone rubber insulators in the process of power grid operation are vulnerable to a variety of environmental factors, such as humidity, partial discharge, ultraviolet radiation, icing and so on, which lead to a significant decline in hydrophobicity, mechanical properties and electrical properties, and bring serious threats to the safe operation of power grid. At present, the anti-pollution flashover mode of power grid power transmission and transformation equipment, which takes cleaning as the main method, can-not adapt to the current power grid operation environment and the impact of harsh environment, resulting in frequent power grid safety accidents. This paper summarizes the influencing factors, aging mechanism and evaluation methods of aging degree of silicone rubber insulators at present, and how to repair aging insulators and improve their anti-pollution flashover performance. Finally, the effective repair of aging silicone rubber insulator is summarized and prospected, the aging factors of insulator in specific environment are analysed, and corresponding countermeasures are taken to repair, which lays a good theoretical foundation for the future research of silicone rubber insulation materials.