Degradation Characteristics of Insulation Discharge at the Interface of Moisture-Affected Cable Accessories

Investigations have shown that crosslinked polyethylene (XLPE) cable joints are vulnerable to moisture intrusion, which wets the composite interface, triggers discharge, and eventually causes insulation breakdown accidents. However, the mechanism of moisture-induced insulation failure at the composite interface remains unclear, limiting effective diagnosis of joint moisture conditions. This paper investigates the effect of moisture intrusion on the discharge failure process of cable joints under operating conditions. An accelerated moistureaging platform was established, and partial discharge (PD) measurements were performed on