For studying the aging mechanism of silicone rubber of composite insulator under high frequency electric field

the high frequency electric aging test platform is set up in this paper so to study the influence of high frequency electric field on the micro properties of high temperature vulcanized（HTV）silicone rubber after aging. The results show that:High-frequency electrical aging causes holes and a large number of cracks on the surface of silicone rubber

and some fillers decompose and lose and the hydroxyl content decreases first and then increases

but it is eventually still lower than that of the unaged sample

causing the decrease of the static dielectric polarization of the interface and weakening the interface polarization strength. The weight loss at the third stage of pyrolysis increases with the electric aging time

which indicates the breakage of long chain of PDMS molecules

increase of the number of polar groups and the increase of the polarization rate and strength of dipole.In addition

both the dielectric constant and dielectric loss of silicone rubber increase with the aging time and an obvious dielectric loss peak appears at 144 h. By modifying Cole-Cole model

the dielectric spectrum curve is divided into three relaxation processes and two conductance processes

the variation rule is verified in SEM analysis

infrared spectrum analysis and TG analysis. The static dielectric polarization of dipole which can be used to quantitatively evaluate the high frequency electrical aging state of silicone rubber is proposed.In this paper

a kind of new artificial accelerated aging method is proposed and the variation trend of its dielectric properties is discussed

from which the new aging state evaluation parameters are extracted

which can provide theoretical reference for further exploration of the mechanism and aging efficiency of high frequency electrical aging.