Study on the External Insulation Characteristics of Epoxy Resin After Corona Aging Under Hygrothermal Coupling Effect

Epoxy resin has the characteristics of high adhesion and insulation, excellent dielectric properties, mechanical properties and heat resistance, good chemical stability and easy processing. However, in hygrothermal, epoxy resin generally has insulation aging phenomenon, which seriously affects the reliability and service life of equipment operation. In this paper, a hydrothermal corona aging platform was first built, and then the samples were subjected to artificial accelerated aging for up to 5 days under different hydrothermal environments, and the leakage current and flash-over voltage of the samples after aging were tested. The results show that the wet flash-over voltage of the epoxy resin aged samples affected by different temperatures is larger than that of the aged samples affected by different humidity, and the flash-over voltage is smaller. The higher the relative humidity of the aging sample, the greater the effective value of the leakage current, and the stronger the waveform periodicity. However, compared with the influence of different temperatures, the insulation performance of low humidity aging samples is less damaged.