Abstract
The composite interface of cable and accessories insulation has long been in a complex environment of combined action of electricity, heat and moisture. The interface coating silicone characteristics play a key role in the interface reliability. In this paper, based on coating silicone grease on cable accessories, the effects of thermal, corona and wet aging on the swelling process of silicone grease on the surface of silicone rubber and the variation of silicone rubber properties after swelling were studied. The results showed that thermal aging, corona aging and wet aging accelerated the swelling of silicone grease. Thermal aging increases the diffusion rate of silicone grease in silicone rubber by increasing the relative motion between silicone grease and silicone rubber molecules. Corona aging destroys the crosslinking structure of silicone rubber by strong oxidants such as ozone and high energy charged particles, which promotes the swelling of silicone grease. Humid aging increases the polarity of silicone grease due to water absorption, and water molecules enter the rubber, which leads to deep swelling. Three kinds of aging destroyed the surface morphology of silicone and silicone rubber.
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