Taking the heating of a 110kV high-voltage cable GIS terminal as an example, this article analyzes the impact of cable installation process and grounding method on the operation of cable accessories, and finally discusses the grounding process of cable accessories. The cable terminal was abnormally heated, and during operation, live detection found cross-linking errors and excessive circulating current. After power outage and disassembly, it was found that the tail pipe structure design of the connector was unreasonable, and the grounding current flowed through the cone-shaped spring, causing heating and burning of the cable body and epoxy sleeve.
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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