Taking the failure of a 220 kV high-voltage cable intermediate joint as an example, this article analyzes the aging and failure of joints with epoxy resin as the insulating medium. Through testing the insulating structure, physical and chemical properties, and electrical performance of epoxy joints, it explores the impact of using epoxy resin as the insulating medium on the operation of cable joints. The analysis suggests that epoxy resin as the insulating medium of cable joints is prone to microcracks between the production process and the aluminum electrode interface, which accelerates the aging of epoxy materials under the action of electric field in later operation, increasing the risk of fault tripping.
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