Composite Insulator Silicone Rubber Suspension Insulator

4) Wet flashover has high pollution flashover voltage. The hydrophobicity of the low-energy surface of organic composites is the main reason for the excellent resistance to moisture and dirt of composite insulators. Under severe weather conditions such as heavy fog, light rain, dew, melting snow, and melting ice, separate water droplets are formed on the surface of the composite insulator instead of a continuous water film. The local arc, the local arc is also difficult to further develop and lead to external insulation flashover. After running for a period of time, after the surface of the composite insulator is contaminated, the hydrophobicity can migrate to the surface of the contamination layer, which is unique to the silicone rubber material. Under the same pollution degree, its pollution flashover voltage can reach more than twice that of the insulator with the same leakage distance. The equivalent diameter of ordinary rod-shaped suspension composite insulators is much smaller than that of ordinary suspension ceramic insulators and pillar glass insulators, which is also an important reason for its excellent pollution resistance. Under unfavorable conditions, the hydrophobicity may decrease or be lost due to the influence of electrical and environmental stress, but its equivalent diameter will not become thicker, so the pollution flashover voltage will still maintain a high level.