Polypropylene 220kV molded cable joint and manufacturing method thereof

Abstract

The invention discloses a polypropylene 220kV molded cable joint and a manufacturing method thereof. The method comprises the following steps: removing an outer sheath and a metal sleeve at one ends of two to-be-connected cables, and reserving a water-blocking buffering belt; preprocessing the outer semi-conductive layers, the insulating layers and the inner semi-conductive layers of the cables; connecting conductors of the two cables located on the same horizontal plane through an exothermic welding technology; arranging the inner semi-conductive layers at the welding positions; forming insulating layers at the inner semi-conductive layers by adopting a polypropylene insulating material; and forming the outer semi-conductive layers on the insulating layers by adopting a semi-conductive material. The manufacturing method of the molded joint is convenient to operate, the manufactured intermediate joint and the cables form an integrated structure, and the problem of breakdown of the intermediate joint of the cable due to local electric field distortion of an insulating layer caused by a movable interface generated by different materials between the cable and the intermediate joint can be solved.

Description

technical field [0001] The invention relates to the technical field of power cables, in particular to a polypropylene 220kV molded cable joint and a manufacturing method. Background technique [0002] As important power equipment, power cables are an important part of power transmission and distribution systems. Among them, the cable intermediate joint, as the most used component in the cable accessories, is the weak link in the electrical insulation and mechanical properties of the cable line, and is the key point to improve the safety and reliability of the cable line operation. [0003] At present, cross-linked polyethylene (XLPE) is generally used as the insulating material for high-voltage cables, but there are certain problems: 1) The cross-linking process equipment occupies a large space, the production efficiency is low, the energy consumption is large, and the equipment investment and energy loss are large; 2) XLPE has the characteristics of thermosetting materials...

AI Technical Summary

Problems solved by technology

[0003] At present, cross-linked polyethylene (XLPE) is generally used as the insulating material for high-voltage cables, but there are certain problems: 1) The cross-linking process equipment occupies a large space, the production efficiency is low, the energy consumption is large, and the equipment investment and energy loss are large; 2) XLPE has the characteristics of thermosetting materials, and waste materials are difficult to reuse through recycling

[0004] Existing cross-linked polyethylene cable joints also have certain problems. In addition to being unable to recycle and reuse, the cross-linking process and degassing process also cause the production time and cost of cable joints to be much higher than that of thermoplastic insulated cable joints.

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