Explain some advantages of composite insulators
Silicone composite insulator is composed of glass fiber epoxy rod, silicon rubber umbrella skirt and metal fittings. It can effectively use narrow corridors to open the transmission power. It is suitable for the technical transformation of urban power grids, can reduce the height of the tower, and can save a lot of manpower, material and financial resources, because of its high bending strength.
Can prevent the cascading fracture accident of porcelain cross arm is an irreplaceable product of porcelain cross arm. Small size, light weight, strong impact resistance and impact resistance, no manual cleaning is required, providing protection for operation. Compared with traditional porcelain insulators and glass insulators, composite insulators have the following advantages: high strength and light weight.
Composite insulators have a high strength-to-weight ratio, that is, a high specific strength. Its high mechanical strength comes from the mechanical properties of the FRP mandrel. The tensile strength of the widely used FRP tensile rod can reach more than 1000MPa, and the density of the core rod is only 2g / cm3, so its specific strength is very high, 5-10 times higher than carbon steel. At the same voltage level, composite insulators The weight is only 1/7? 1/10 of the porcelain insulator.
Wet flashover has a higher flashover voltage. The hydrophobicity of the low-energy surface of organic composite materials is the main reason for the moisture resistance of composite insulators. In severe weather conditions, such as heavy fog, light rain, dew, melting snow and melting ice, separated water droplets are formed on the surface of the composite insulator instead of a continuous water film. The conductivity of the polluted layer is very low, so the leakage current is also very small, and it is not easy to cause a strong current.