Sealing structure of aluminum-plastic composite sheath high-voltage cable joint

Abstract

The invention relates to a sealing structure of an aluminum-plastic composite sheath high-voltage cable joint. The sealing structure comprises two aluminum-plastic composite sheath high-voltage cables, a copper shell around a cable joint, and an insulating heat-shrinkable tube for performing a waterproof treatment on the copper shell, and is characterized by further including a plastic composite material for fixing the copper shell and a sealing strip. The specific sealing operation comprises steps of reversely folding the copper wire shields in the two aluminum-plastic composite sheath high-voltage cables to the outer surface of the aluminum-plastic composite sheath; sleeving the outer side of a cable intermediate joint with the copper shell; folding the portions of the tail ends of the copper wire shields end exposing the tail end of the copper shell to the outer surface of the copper shell, and welding the portions to the copper shell by a lead seal to complete the electrical connection of high-voltage cable metal shield; wrapping the plastic composite material between the copper shell and the high-voltage cable body; wrapping and sealing the cable with a waterproof insulating tape; and finally disposing the insulating heat-shrinkable tube on the joint of the two aluminum-plastic composite sheath high-voltage cables and the copper shell, and performing a waterproof sealing treatment by a sealing strip.

Description

technical field [0001] The invention relates to a sealing structure of a high-voltage cable joint, and in particular discloses a sealing structure of a high-voltage cable joint with an aluminum-plastic composite sheath, which is suitable for waterproof and moisture-proof sealing treatment of the middle joint of a high-voltage cable with an aluminum-plastic composite sheath. Background technique [0002] High-voltage power cables are mainly laid in pipes and tunnels. Due to the limited capacity of the cable tray, it is inevitable to connect two sections of cables through the intermediate joint for extension. Since the cable body at the joint is damaged, it is necessary to use additional Restoration measures to reconfigure its waterproof structure to avoid moisture entering the joints and adversely affecting the operating life of the cable joints. [0003] At present, most of the mainstream high-voltage power cables in the market use metal sheaths as the channels for short-cir...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the defects of the prior art, to design a sealing structure for high-voltage cable joints with aluminum-plastic composite sheaths, to use plastic composite materials to replace lead seals for moisture-proof sealing of the intermediate joints, and to restore the electrical connections on the cables. It is realized by copper wire shielding, which solves the problem that the aluminum-plastic composite sheath cable cannot be burned into the lead seal, and ensures the normal operation of the high-voltage cable; Corresponding waterproofing measures are taken at the mouth of the insulating heat-shrinkable tube to effectively realize the axial sealing of the high-voltage cable joint with the aluminum-plastic composite sheath and achieve the effect of waterproofing and moisture-proofing

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