Focusing on the HTV-silicone rubber insulators aging problem of Hami section in the Hami-Zhengzhou ±800 k V UHV DC transmission project

the climatic characteristics of dry weather and strong UV radiation in Hami area were extracted

and UV-accelerated aging experiments for UHV level HTV-silicone rubber materials and normal voltage level HTV-silicone rubber materials were conducted in dry environment.Hardness measurement

static contact angle measurement

and Fourior transform infrared spectroscopy（FTIR）analysis were performed for the samples. Experimental results show that for both kinds of materials

the hardness increases

the hydrophobic property becomes weaker

the filler is partially bare

and FTIR peak areas of Si-CH3 and Si-O-Si become narrower. In the condition of similar initial data of the two kinds of samples

the data variations of UHV level samples are smaller than that of the normal level samples because the UHV level HTV-silicone rubber materials are optimized in formulation and manufacturing process and their UV aging resistance is superior to that of the normal voltage level ones in dry environment.