Cable terminal head fabrication method capable of improving local insulation performance

A technology of insulation performance and manufacturing method, applied in the direction of equipment for connecting/terminating cables, etc., to achieve the effect of improving the distribution of electric field intensity

Inactive Publication Date: 2018-05-18
STATE GRID TIANJIN ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the inevitable introduction of impurities in the above-mentioned process of making cable terminals, the quality of cable terminals becomes a bottleneck that restricts the overall insulation level of high-voltage cables

Method used

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  • Cable terminal head fabrication method capable of improving local insulation performance
  • Cable terminal head fabrication method capable of improving local insulation performance
  • Cable terminal head fabrication method capable of improving local insulation performance

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specific Embodiment

[0087] Taking copper core XLPE insulated PVC sheathed power cable YJQ02-Z-220kV-1×240 as an example, its main parameters are:

[0088] a=15.5mm;

[0089] l=1000m;

[0090] L=0.1m;

[0091] The value of the thickness δ of the semiconducting strip 6 should be the same as figure 2 The thickness of the inner shielding layer 4 of the medium cylindrical high-voltage cable is the same, that is, 1.5mm, so c=15.5+1.5=17mm;

[0092] From formula (16) can get x=1.0968*10 4 , that is, the extreme value of the electric field intensity on the inner surface of the cold-shrinkable insulator 8 is only the electric field intensity on the surface of the conductor

[0093] When the impurity concentration of 100 μm in the insulating layer 2 increases by 5 times, its power frequency and impact breakdown strength (breakdown probability is 63%) decrease by 17% and 14% respectively, namely:

[0094] The power frequency breakdown strength of the inner surface of the cold-shrinkable insulating pa...

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Abstract

The invention relates to a cable terminal head fabrication method capable of improving local insulation performance. The cable terminal head fabrication method comprises the steps of stripping a grounding metal shielding layer, an external shielding layer, an insulation layer and an internal shielding layer at an end part of a cylindrical high-voltage cable; winding a semi-conduction tape around aconductor; coating silicone grease outside the semi-conduction tape; sleeving a metal sleeve outside the semi-conduction tape of which a surface is coated with the silicone grease; coating the silicone grease on a surface of the metal sleeve; and sleeving a cold contraction insulation piece outside the metal sleeve of which the surface is coated with the silicone grease. According to the cable terminal head fabrication method capable of improving the local insulation performance, provided by the invention, the intensity distribution of an electric field is improved by a method of arranging the metal sleeve in the high-voltage cable terminal, so that the intensity extreme value of the electric field in the terminal cable is far lower than power frequency and the intensity of an impact breakdown electric field, and the integral insulation level of the high-voltage cable cannot be affected even impurity is introduced during the cable terminal head fabrication process.

Description

technical field [0001] The invention belongs to the technical field of electric power supply, and in particular relates to a manufacturing method of a cable terminal capable of improving local insulation performance. Background technique [0002] "Summary of High-voltage Cross-linked Cable Materials and Process Development" (written by Ouyang Benhong, etc.) analyzed the impurity content, shape, dielectric parameters, smoothness of the interface between the insulating layer and the semi-conductive shielding layer in the material, and the impact of the cable manufacturing process on the performance of the cable. It is pointed out that in addition to micropores in the insulating layer of high-voltage cables, impurities are the biggest hidden danger to the reliability of high-voltage cables, and impurities with sharp shapes and high conductivity are particularly serious. When the shape of the impurity defect is sharp and the dielectric constant is high, the local electric field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/14
CPCH02G1/14
Inventor 兰春虎范巍李盛伟王楠高军彦王梦杨赫王兆峰范伟王江
Owner STATE GRID TIANJIN ELECTRIC POWER
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