Processing method for interface of molded joint of high-voltage cable

A processing method and technology for high-voltage cables, applied in the direction of connecting/terminating cables, etc., can solve the problems of affecting the interface properties of materials, over-crosslinking of insulating materials, and increased steric hindrance, etc., to improve the overall mechanical properties, increase Large contact area, the effect of reducing steric hindrance

Pending Publication Date: 2022-04-15
HENGTONG SUBMARINE POWER CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the main insulation of the cable has been cross-linked during production (the cross-linking degree is about 80%), after the material is transformed from a linear to a network molecular chain, the steric resistance increases. Insulation is directly subjected to secondary vulcanization, which easily makes the insulating material over-crosslinked, thus affecting the interface properties of the material

Method used

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  • Processing method for interface of molded joint of high-voltage cable
  • Processing method for interface of molded joint of high-voltage cable
  • Processing method for interface of molded joint of high-voltage cable

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In this embodiment, the cable whose model specification is YJLW03 127 / 220 1*2500 is selected, and it is treated with molded joints. The specific treatment process is as follows:

[0036] (1) After conductor welding and conductor shielding molding are completed, mechanically polish with 400-grit sandpaper, wipe with cable cleaning paper, and finally transfer to extrusion vulcanization mold with integrated plasma treatment function;

[0037] (2) Use nitrogen as the medium gas for plasma surface treatment, the flow rate is 100 sccm, the vacuum degree in the chamber is kept at 20-50Pa, the discharge power is 50W, and the treatment time is 30s-5min. After the treatment is completed, immediately squeeze the insulating material into the extrusion port, and after the extrusion port overflows, close the discharge port and the extrusion port in turn. According to the requirements of the vulcanization process, set the following heating program: heat to about 120°C for 15-20 minute...

Embodiment 2

[0039] In this embodiment, the cable whose model specification is YJLW03 127 / 220 1*2500 is selected, and it is treated with molded joints. The specific treatment process is as follows:

[0040] (1) After conductor welding and conductor shielding molding are completed, mechanically polish with 400-grit sandpaper, wipe with cable cleaning paper, and finally transfer to extrusion vulcanization mold with integrated plasma treatment function;

[0041](2) Argon is used as the medium gas for plasma surface treatment, the flow rate is 100sccm, the vacuum degree in the chamber is kept at 20-50Pa, the discharge power is 50W, and the treatment time is 30s-5min. After the treatment is completed, immediately squeeze the insulating material into the extrusion port, and after the extrusion port overflows, close the discharge port and the extrusion port in turn. According to the requirements of the vulcanization process, set the following heating program: heat to about 120°C for 15-20 minutes...

Embodiment 3

[0043] In this embodiment, the cable whose model specification is YJLW03 127 / 220 1*2500 is selected, and it is treated with molded joints. The specific treatment process is as follows:

[0044] (1) After conductor welding and conductor shielding molding are completed, mechanically polish with 400-grit sandpaper, wipe with cable cleaning paper, and finally transfer to extrusion vulcanization mold with integrated plasma treatment function;

[0045] (2) Use the mixed gas of nitrogen and argon as the medium gas for plasma surface treatment, the flow rate of nitrogen gas is 40 sccm, the flow rate of argon gas is 60 sccm, the vacuum degree in the chamber is kept at 20-50Pa, the discharge power is 50W, and the treatment time is 30s~ 5min. After the treatment is completed, immediately squeeze the insulating material into the extrusion port, and after the extrusion port overflows, close the discharge port and the extrusion port in turn. According to the requirements of the vulcanizati...

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Abstract

The invention discloses a high-voltage cable molded joint interface treatment method, which comprises the following specific operations: (1) treating a crosslinked cable insulation body by using plasma, and immediately performing insulation material extrusion molding after treatment; (2) after full filling, a vulcanization process is carried out, a cross-linking reaction is carried out, and the vulcanization process comprises three heating and heat preservation stage processes; and (3) after the reaction is finished, cooling and preserving heat to eliminate internal stress. According to the method, the cable insulation surface is treated through plasma, so that a cross-linked network structure on the surface is cracked, steric hindrance is reduced, meanwhile, a large number of free radicals are generated, firm binding force between the cable insulation surface and a newly injected insulation material is promoted, and the performance of a body cannot be affected by over-crosslinking; and the electrical and mechanical properties of the molded joint under high-pressure work are improved.

Description

technical field [0001] The invention relates to a method for treating the interface of a cable joint, in particular to a method for treating the interface of a molded joint of a high-voltage cable. Background technique [0002] The use of high-voltage cross-linked cables is increasing day by day, and cable accessories are also growing as an important part of cable lines. According to incomplete statistics, the failure rate of cable accessories accounts for about 70% of the failure probability of high-voltage cross-linked cable transmission lines. Therefore, cable accessories are regarded as the weak link of cable lines, and their product quality directly affects the power supply of the power system. security and stability. At present, there are two main types of cable intermediate joint accessories used on domestic high-voltage cross-linked cables: prefabricated joints and molded joints. Among them, the molded joint solves the problem of the movable interface between the p...

Claims

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Application Information

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IPC IPC(8): B29C59/14H02G1/14
Inventor 狄健潘文李春梅徐操袁渊童晓
Owner HENGTONG SUBMARINE POWER CABLE CO LTD
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