Study on Hydrophobic Mobility of Composite Insulators at Different Umbrella Skirt Positions

Hydrophobicity and hydrophobicity migration, as important indicators for evaluating the aging degree of composite insulators and the operating condition of transmission lines, have significant research value. This article takes AC composite insulators with different years of grid operation in Shandong region as the research object. The static contact angle method is used to conduct artificial pollution experiments on the high, medium, and low voltage end skirts of composite insulators under different years of operation. Molecular dynamics software is used to simulate the adsorption effect of different substances in the pollution layer on siloxane molecules, and the microscopic mechanism of electric field on hydrophobic migration is studied. The results indicate that in the artificial pollution experiment, the hydrophobicity migration of the high and medium voltage ends is superior to that of the low voltage end. The adsorption of siloxane molecules on the surface of kaolin is the strongest. The greater the electric field intensity, the stronger the adsorption capacity.