Producing method of soft joint for cross-linked polyethylene cable

A cross-linked polyethylene and soft joint technology, which is used in cable joints, equipment for connecting/terminating cables, etc., can solve the problem that the die casting joint technology has not been really used, the construction period is long, and the operation skills of engineering and technical personnel High level requirements, etc., to achieve the effect of eliminating creepage effect defects, eliminating void defects, and eliminating air gap defects

Active Publication Date: 2009-10-28
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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  • Producing method of soft joint for cross-linked polyethylene cable
  • Producing method of soft joint for cross-linked polyethylene cable
  • Producing method of soft joint for cross-linked polyethylene cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment one: if figure 1 As shown, 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 tube 4 arranged on the outermost surface. 2, the 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 a polyethylene-filled vulcanized insulating layer 5, which is filled with polyethylene The vulcanized insulating layer 5 is filled and vulcanized by polyethylene material, and the polyethylene filled vulcanized insulating layer 5 is vulcanized and fused with the polyethylene insulating layer 13 of the cable. The transition connection section 51 outside the insulating layer 13, the outer semiconducting layer 6 combined with the reserved section 14 of the outer shielding layer of the cable is ar...

Embodiment 2

[0019] 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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Abstract

The invention discloses a preparation method of a cross-linked polyethylene cable flexible joint, which comprises an inner semi-conductive layer and a metal sheath. The reserved section of the inner shielding layer is combined, and the characteristic is that the inner semi-conductive layer is provided with a polyethylene-filled vulcanized insulating layer. The polyethylene-filled vulcanized insulating layer and the polyethylene insulating layer of the cable are vulcanized and fused with each other. There is a transition connection section wrapped outside the polyethylene insulating layer of the cable, the polyethylene filled vulcanized insulating layer is provided with an outer semi-conductive layer combined with the reserved section of the outer shielding layer of the cable, and both ends of the metal sheath are connected to the cable. The outer surfaces of the lead sheathing tube are welded to each other, and the two ends of the metal sheathing tube are provided with slope connection sections. , there are significant improvements and improvements.

Description

technical field [0001] The invention relates to a cable joint, in particular to a preparation method of a cross-linked polyethylene cable flexible joint. 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: wrapping...

Claims

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Application Information

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Patent Type & Authority Patents(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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