Cable outer sheath thermal shrinkage patching method

A technology for outer sheath and cable, which is applied in the field of cable outer sheath thermal shrinkage repair method, which can solve the problem that the cable insulation tape and the outer sheath are easy to enter water and moisture, the cable insulation tape cannot be in close contact with the outer sheath layer, and the cable Problems such as poor strength of the insulating tape are achieved to solve the effects of incomplete maintenance, good fixing effect and simple equipment

Active Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After a long period of operation and maintenance, it was found that the above-mentioned traditional outer sheath maintenance method has some disadvantages. First, the cable insulation tape cannot be in close contact with the outer sheath layer, and the cable runs in a long-term humid environment in the tunnel. The gap between the belt and the outer sheath is prone to water and moisture ingress, resulting in failure of the insulation at the repaired position and causing safety hazards to the cables in operation; secondly, the cable insulation belt has poor strength and is easily damaged during construction, resulting in Water and moisture can also cause safety hazards

Method used

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Effect test

Embodiment 1

[0034] 15 damaged parts of the outer sheath of the 220kV Yuancang first-line cable of the Shijiazhuang Power Supply Company in Hebei Province are maintained by adopting the thermal shrinkage repair method of the outer sheath of the present invention.

[0035] Specific steps are as follows:

[0036] Step 1: Use a glass sheet to scrape off the graphite layer at the damaged part of the cable outer sheath, specifically, the damaged part of the outer sheath is the center of the circle, and the scraping radius is 10cm;

[0037] Step 2: Use J-20 insulating self-adhesive tape to wrap and seal the section of the damaged part of the cable. The winding method is: wrap the insulating self-adhesive tape for 4 turns, and each turn of the insulating self-adhesive tape is self-adhesive to the previous round of insulating self-adhesive tape. Half of the belt is overlapped, and the winding range covers the scraped graphite layer;

[0038] Step 3: Cover the part where the insulating self-adhesi...

Embodiment 2

[0041] 8 damaged parts of the outer sheath of the 220kV Yuancang first-line cable of Shijiazhuang Power Supply Company in Hebei Province are maintained by adopting the thermal shrinkage repair method of the outer sheath of the present invention.

[0042] Specific steps are as follows:

[0043] Step 1: Use a glass sheet to scrape off the graphite layer at the damaged part of the cable outer sheath, specifically, the damaged part of the outer sheath is the center of the circle, and the scraping radius is 20cm;

[0044] Step 2: Use J-20 insulating self-adhesive tape to wrap and seal the section of the damaged part of the cable. The winding method is: wrap the insulating self-adhesive tape 5 times, and each turn of the insulating self-adhesive tape is insulated and self-adhesive to the previous circle. Half of the belt is overlapped, and the winding range covers the scraped graphite layer;

[0045] Step 3: Wrap the protective sheet made of PET heat-shrinkable material on the cabl...

Embodiment 3

[0048] Nine damaged parts of the outer sheath of the 220kV Yuancang No. 2 cable of the Shijiazhuang Power Supply Company in Hebei Province are maintained by adopting the thermal shrinkage repair method of the outer sheath of the present invention.

[0049] Specific steps are as follows:

[0050] Step 1: Use a glass sheet to scrape off the graphite layer at the damaged part of the cable outer sheath, specifically, the damaged part of the outer sheath is the center of the circle, and the scraping radius is 15cm;

[0051] Step 2: Use J-20 insulating self-adhesive tape to wrap and seal the section of the damaged part of the cable. The winding method is: wrap the insulating self-adhesive tape for 6 turns, and each turn of the insulating self-adhesive tape is bonded to the previous turn of insulating self-adhesive tape. Half of the belt is overlapped, and the winding range covers the scraped graphite layer;

[0052] Step 3: Wrap the protective sheet made of PET heat-shrinkable mate...

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Abstract

The invention provides a cable outer sheath thermal shrinkage patching method. Specifically, a graphitic layer on the damaged part of a cable outer sheath is scraped off and smoothened through a glass sheet, the section with the damaged part of a cable is wound and sealed through an insulating belt, the insulating belt is wrapped by a protection cover, and thermal shrinkage processing is carried out on the protection cover. According to the technical scheme, damage and water and humidity entering of the cable thermal protection cover can be effectively prevented, and the operation safety of the cable is improved.

Description

technical field [0001] The invention relates to the technical field of electric power equipment, in particular to a heat-shrinkage repair method for an outer sheath of a cable. Background technique [0002] During the laying process of power cables, the outer sheath of the cables is often damaged due to the poor construction environment, which affects the operation of the cables. When dealing with cable outer sheath faults, maintenance workers often use traditional methods to wrap and seal the breach with insulating tape. [0003] After a long period of operation and maintenance, it was found that the above-mentioned traditional outer sheath maintenance method has some disadvantages. First, the cable insulation tape cannot be in close contact with the outer sheath layer, and the cable runs in a long-term humid environment in the tunnel. The gap between the belt and the outer sheath is prone to water and moisture ingress, resulting in failure of the insulation at the repaire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/16
Inventor 李宏峰杨博超邢坤成洪刚张霞胡建彬
Owner STATE GRID CORP OF CHINA
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