Cable intermediate connector and manufacturing and mounting method therefor

Abstract

The invention relates to a cable intermediate joint, which is used to connect three-phase cables of two-circuit power cables, including a conductor connection joint, a cold-shrinkable intermediate joint body, a cable shielding layer recovery part, a cable inner sheath layer recovery part, For the mechanical protection and waterproof sealing part, the intermediate joint adopts a multi-layer solid composite dielectric insulation and sealing structure; the main body of the intermediate joint adopts an integrated multi-layer composite structure, including a stress cone, an inner shielding layer, an insulating layer and an outer shielding layer from the inside to the outside. Among them, the inner shielding layer and the insulating layer adopt a non-equal inner diameter structure, and the inner diameter of the inner shielding layer is larger than that of the insulating layer, and a plurality of semi-conductive stepped contact points are set in the middle of the inner shielding layer; the mechanical protection and waterproof sealing part adopts semi-overlapping winding Armor belt, the outermost layer is sleeved with heat-shrinkable tube and wrapped with heat-shrinkable tape. The invention provides a cable intermediate joint with good conductor connection, reliable insulation, good sealing performance, high mechanical strength and simple structure and its production and installation method, which is of great significance for improving the safety and reliability of cable lines.

Description

technical field [0001] The invention belongs to the technical field of power cables, and relates to a power cable accessory, in particular to a cable intermediate joint and a manufacturing and installing method thereof. Background technique [0002] The power cable intermediate joint is an important part of the cable line, but because the cable accessories are multi-layer solid composite dielectric insulation and sealing structure, it is more complicated than the power cable, and it needs to be manually manufactured and installed on site, and the operating conditions are harsh or even soaked in water for a long time , There are a series of problems such as loose connection of the conductor connecting pipe, eccentric connecting pipe, imperfect sealing and waterproofing of the joint, insufficient mechanical strength, etc., resulting in the cable intermediate joint often becoming a weak link in the cable line. The experience of system operation shows that most of the cable faul...

AI Technical Summary

Problems solved by technology

[0002] The power cable intermediate joint is an important part of the cable line, but because the cable accessories are multi-layer solid composite dielectric insulation and sealing structure, it is more complicated than the power cable, and it needs to be manually manufactured and installed on site, and the operating conditions are harsh or even soaked in water for a long time , there are a series of problems such as loose connection of the conductor connecting pipe, eccentric connecting pipe, imperfect sealing and waterproofing of the joint, insufficient mechanical strength, etc., resulting in the middle joint of the cable often becoming a weak link in the cable line

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