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

A technology of cross-linked polyethylene and flexible joints, which is applied in the direction of cable joints, equipment for connecting/terminating cables, etc., and can solve the problems that the molding joint technology has not yet been really utilized, the construction period is long, and the production process is complicated. , to achieve the effect of eliminating creepage effect defects, eliminating void defects, and ensuring cooling sequence

Active Publication Date: 2007-11-07
宁波东方电缆股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: As shown in Figure 1, a flexible joint of cross-linked polyethylene cables includes an inner semiconductive layer 3 arranged outside the core connecting portion 2 of two cables 1 and a lead sheath arranged on the outermost side Tube 4, at the wire core connection part 2, the wire cores 11 of the two cables are welded to each other, the inner semiconductive layer 3 is combined with the reserved section 12 of the inner shielding layer of the cable, and the inner semiconductive layer 3 is provided with polyethylene filled vulcanization Insulation layer 5, polyethylene-filled vulcanized insulation layer 5 is formed by filling and vulcanizing polyethylene material, polyethylene-filled vulcanized insulation layer 5 and polyethylene insulation layer 13 of the cable are mutually vulcanized and fused, and polyethylene-filled vulcanized insulation layer 5 is provided with The transition connection section 51 coated on the outside of the polyethylene insulating layer ...

Embodiment 2

[0024] Embodiment two: the preparation method of the flexible joint of cross-linked polyethylene cable in embodiment one, comprises the following steps: 1. after stripping and cutting the insulation layer 13 of two ends of cable 1, exposed wire core 11, cleans with absolute ethanol, bakes After drying, silver soldering is used to form the core connection part 2. The welding adopts layered welding, and the solder points of each layer are staggered from each other. The mechanical strength of the welding part is required to be no less than 170N / mm 2;② Cut the cross-linked insulating layer 13 on both sides of the joint into a conical shape. When the end of the cone is gradually approaching the inner shielding layer, use a glass sheet to scrape it. Be careful not to scratch the inner shielding as much as possible. When the inner semiconducting layer is exposed Finally, keep the inner shielding layer at the end of the cone for about 15 mm, set the reserved section 12 of the inner shi...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G15/18H02G1/14
Inventor 吴建宁周厚强叶信宏冯华强
Owner 宁波东方电缆股份有限公司
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