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Manufacturing method of longitudinal water blocking device for intermediate joint of medium voltage power cable

A technology for power cables and intermediate joints, applied in the direction of connecting/terminating cable equipment, etc., can solve the problem of not having longitudinal water blocking ability, etc., to improve the longitudinal waterproof ability, avoid water reverse osmosis, and improve the longitudinal waterproof ability. Effect

Inactive Publication Date: 2016-09-21
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem that none of the intermediate joints of the existing medium-voltage power cables has the longitudinal water-blocking ability, and proposes a method for manufacturing a longitudinal water-blocking device for the intermediate joints of the medium-voltage power cables

Method used

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  • Manufacturing method of longitudinal water blocking device for intermediate joint of medium voltage power cable
  • Manufacturing method of longitudinal water blocking device for intermediate joint of medium voltage power cable
  • Manufacturing method of longitudinal water blocking device for intermediate joint of medium voltage power cable

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specific Embodiment approach 1

[0025] Specific implementation mode 1. Combination figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 Describe this embodiment, the manufacturing method of the medium-voltage power cable intermediate joint longitudinal water blocking device described in this embodiment, the specific steps of the method are:

[0026] Step 1. Cut the joints of the two cables layer by layer from outside to inside;

[0027] Step 2: Connect the two constant force springs 9 on the outer sides of the armor layers 6 of the two cables respectively, crimp one end of the two copper braids 8 into the two constant force springs 9 respectively, and the two copper braids The other end of band 8 is fixedly connected by crimping sleeve 17;

[0028] Step 3, sealing the inner sheath 5, the armor layer 6 and the constant force spring 9 of the two cables with the two first waterproof sleeves 10 respectively;

[0029] Step 4, put the two second waterproof cases 11 on the outer...

specific Embodiment approach 2

[0038] Specific embodiment 2. This embodiment is a further description of the manufacturing method of the medium-voltage power cable intermediate joint longitudinal water blocking device described in specific embodiment 1. The cable described in step 1 includes three-phase wire cores 1, three One main insulation layer 2, three semi-conductive layers 3, three copper shielding layers 4, inner sheath 5, armor layer 6 and outer sheath 7; three main insulation layers 2 are respectively coaxially coated on three-phase wires The outer side of the core 1; the three semiconductive layers 3 are coaxially coated on the outer sides of the three main insulating layers 2; the three copper shielding layers 4 are coaxially coated on the outer sides of the three semiconductive layers 3; the inner protection Layer 5 is wrapped on the outside of the three copper shielding layers 4 ; the armor layer 6 is wrapped on the outside of the inner sheath 5 .

specific Embodiment approach 3

[0039] Specific Embodiment 3. This embodiment is a further description of the manufacturing method of the medium-voltage power cable intermediate joint longitudinal water blocking device described in Embodiment 1. The first waterproof sleeve 10, the second waterproof sleeve 11 and the finger sleeve 12 Wrapped with waterproof tape to achieve.

[0040] Strip and cut the two ends of the cable to be made into the cable intermediate joint according to the required size ( figure 1 shown), tie the copper braid and the armor layer with a constant force spring or copper wire, and cross the outer sheath, armor layer, and inner sheath with waterproof tape around the breakpoint of the outer sheath and armor layer Repeatedly bypass the gaps between the three-phase cables to form the first waterproof jacket (the first longitudinal water-blocking layer), and then use the cold-shrinkable waterproof second waterproof jacket (the second longitudinal water-blocking layer) to pass through the thr...

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Abstract

The invention relates to a method for manufacturing a longitudinal water stopping device of a medium-voltage power cable intermediate head. The problem that an existing medium-voltage power cable intermediate head does not have the longitudinal water stopping function is solved. According to the method, the portion, at the position of the intermediate head, of a cable is peeled and cut, a cable copper shield at the position of the intermediate head is recovered through a copper woven mesh, a cable copper armor at the intermediate head is recovered through a copper woven belt, conductor connection is achieved through a butt-joint pipe, connection of inner and outer semiconducting parts and insulation parts are recovered through a stress cone, meanwhile, three-layer longitudinal water stopping is achieved through a first waterproof jacket, a second waterproof jacket and three finger cots, waterproof layers are connected in a closed mode, a copper mesh additional layer and an armor additional layer are arranged on the outer side of the copper woven belt, the copper shield and the armor layer of the cable are recovered, and the problem that an existing medium-voltage power cable intermediate head does not have the longitudinal water stopping capacity is effectively solved. The method is applicable to the medium-voltage power cable intermediate heads.

Description

technical field [0001] The invention relates to a manufacturing method of a longitudinal water blocking device for an intermediate joint of a medium-voltage power cable. Background technique [0002] At present, the intermediate joints of 10kV and 20kV medium-voltage power cables at home and abroad do not have the ability to prevent water in the longitudinal direction. In production practice, there are a large number of directly buried power cables that cause water to enter the cable body due to damage or damage to the outer sheath. , the moisture entering the cable body penetrates or flows into the cable intermediate joint along the cable body, causing progressive joint failures such as the reduction of the insulation performance of the cable intermediate joint, aging of water branches, severe partial discharge, and breakdown of insulation discharge, leading to power outages. occur, which greatly affects the quality and reliability of power supply. In recent years, among t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G1/14
Inventor 刘金龙杨琳刘鲁嘉
Owner STATE GRID CORP OF CHINA
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