Research of cycloaliphatic epoxy resin and silicone rubber composite insulator interface based on four‐electrode system and temperature rise model

Interface degradation between mandrel and sheath can cause a decrease in insulation performance mechanical strength of composite insulators. In this study, the interface ageing properties cycloaliphatic epoxy resin silicone rubber insulator were compared. A water diffusion test was adopted to simulate hot humid environment. four-electrode system built detect leakage current at different locations (mandrel, interface), which is an important basis for evaluating performance. The degree could be quantitatively characterised by change. It found that infiltrated moisture had great effect on Based absorption result, two insulators mainly influenced their sealing quality. As auxiliary evaluation method, temperature rise during recorded using infrared camera. experiment results showed main factor However, level reduction caused wet sheath. addition, model proposed based good correspondence material insulation. incorporated multiple processes such as heating insulators, it predict early well.