Soft joint for cross-linked polyethylene cable and producing method thereof

Abstract

This invention discloses a soft joint of a cross-linked polythene cable including an inner semiconductive layer and metal jacket sleeves, in which, two core leads between two cables are welded to form a core connection part, the inner semiconductive layer is combined with a preserved section of the inner screen layer of the cable characterizing in setting a polythene filled vulcanized insulation layer out of the inner semiconductive layer to be fused with the polythene insulation layer of the cable, and wrapping the polythene insulation of the cable with a transition connection section and an outer semiconductive layer combining with the preserved section of the outer screen of the cable is set out of the polythene filled vulcanized insulation layer, two ends of the metal jacket sleeve are welded with the out surfaces of lead protection pipe of the cable and set with slope connection sections.

Description

technical field [0001] The invention relates to a cable joint, in particular to a soft joint of a cross-linked polyethylene cable and a preparation method thereof. Background technique [0002] Existing cross-linked polyethylene cables often need a long length when used, and due to the limitation of manufacturing technology, the length of a single cable is limited to a certain extent. Since the length of a single cable is not enough, it is necessary to connect multiple cables, and the connection of the current cross-linked polyethylene cables is often done with flexible joints. In order to ensure that the entire cable has good electrical properties, the flexible joint is required to have the same excellent electrical properties as the body of the XLPE cable. There are various structures of traditional joints, among which soft joints are better used. However, at present, the manufacturing process of cable intermediate joints with various structures mainly includes six types...

AI Technical Summary

Problems solved by technology

However, it is precisely because of the cross-linked polyethylene heat shrinkable tape that must be used in the molded joint process that it is inevitable that pollutants will be entrained in the production process of this cross-linked polyethylene insulating tape; During the process, a certain amount of air gap must be entrained; therefore, the molded joint process is only suitable for making cross-linked insulated power cable factory soft joints below medium and low voltage levels.

[0004] Although the flexible joints made by the mold-casting joint process have the best electrical performance, due to the complicated manufacturing process and long construction period, it generally takes 3 to 4 weeks to make a three-phase molded joint. The requirements are strict, and the engineering and technical personnel who make the joints have a high level of operational skills and require a lot of process equipment.

Therefore, in recent years, the mold casting joint technology has not been really utilized.

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