Effect of UV Radiation on Different Voltage Grade of HTV-Silicon Rubber in Dry Conditions Performance

Along with our country " west-east electricity transmission " project and UHV projects, HTV-silicon rubber with superior properities has been more and more widely used in the western regions of China.The paper focus on hami to zhengzhou ±800kV UHV DC transmission project which in hami HTV-silicon rubber insulators aging problems, extract dry and the strong UV radiation climatic characteristics of the hami area to quantify, in the dry environment we conduct UHV levels of HTV-silicon rubber materials and normal voltage levels of HTV-silicon rubber materials on UV accelerated aging experiment.And the tests of hardness,static contact angle and Fourior transform infrared spectroscopy ( FTIR) are performed for the samples. The experimental results show that both samples hardness are larger, the flexibility are reduced; their both surface static contact angle are decreased, the hydrophobic are part of the loss; their both surface roughness are bigger,and a part of filler is leaked; FTIR of peak area of Si-CH3 and Si-O-Si keys absorption peak are reduced, shows a portion of the Si-CH3 and Si-O-Si keys is interrupted into free radicals; under the condition of the initial data of the two kinds of samples are similar , the variation of UHV levels of each data sample is lower than it of normal levels of samples. This is due to the UHV grade of HTV-silicon rubber materials on the formulation and manufacturing process are optimized, in the dry environment the UV aging resistance of UHV levels of HTV-silicon rubber materials is superior to it of ordinary voltage grade of HTV-silicon rubber materials.