High voltage test on 245 kV post insulators with different materials

Post insulators are exposed to pollution which can influence the performance of the insulation. To overcome this problem, post insulators were designed and made with different type and materials. One of the methods to observe the insulation characteristic of the post insulators is by performing withstands voltage test and measuring the leakage current. This test objective is to perform withstand voltage test and leakage current measurement under alternating voltage and direct voltage on 245 kV post insulators of different materials (ceramic, silicon-coated and hybrid) and analyze the behaviors and performance of the 245 kV post insulators under electrical and environmental stress.