Study on Aging Properties of External Insulation for Silicon Rubber Composite Insulator

HTV silicone rubber has been used as the outer insulation material of composite insulators because of its outstanding hydrophobicity,hydrophobicity transfer property and hydrophobicity recovery properties.However,compared with inorganic material, HTV silicon rubber is easier to be aged by corona and UV radiation.In this paper,a needle-plane electrode system is used to simulate the process of point corona discharge,and UV accelerated aging test is carried out for HTV silicon rubber by xenon lamp radiation.Test result shows that the hydrophobicity loss on the HTV silicone rubber surface is progressive,but UV radiation and pure electric field all have little affect on the hydrophobicity of HTV silicon rubber.After UV radiation,HTV silicone rubber is much harder and rougher.The surface became rugged,and the filler has the trend of exposure.