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Slicing improvement method based on cross-linked cable slicer

A technology of cross-linked cables and slicers, applied in sampling devices and other directions, can solve the problems of large cross-sectional area, thick samples, broken blades, etc., and achieve the effect of improving thickness accuracy, reducing contact area, and protecting blades

Active Publication Date: 2018-08-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large cross-sectional area and thick insulation thickness of cables of 110kV and above, the original slicing method will bring two main problems: 1. It is impossible to obtain a thicker sample, otherwise the blade will break
2. Thinner samples cannot be obtained, because the blade will be lifted under the force of the wide insulating layer, and the sample cannot be cut

Method used

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  • Slicing improvement method based on cross-linked cable slicer
  • Slicing improvement method based on cross-linked cable slicer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the needs of the experiment: Obtain a 0.4mm sample of the required cable near the inner insulating layer. The range of the microtome in this experiment is 5 large divisions of 1 mm, and a slice of 0.4 mm can be obtained by adjusting 2 divisions.

[0025] 1. Select the 110kV XLPE cable that has been in operation for 15 years on Sumitomo Kashobun Panwu Line in Japan as the slicing object, cut the cable, and remove the outer sheath to obtain a three-layer extruded part with a conductor structure about 15cm long.

[0026] 2. Fix the above cable on the cross-linked polyethylene slicer, first adjust the rotary scale handwheel of the slicer, so that the blade just touches the surface of the outer semi-conductive layer of the cable, and then manually drag the cable to a position where the blade cannot touch. Adjust the rotating and lifting scale handwheel of the microtome with 5 large divisions to move the blade down about 1mm, and then rotate the start button to c...

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Abstract

The invention discloses a slicing improvement method based on a cross-linked cable slicer, wherein the slicing improvement method comprises the following steps: selecting a cross-linked polyethylene cable to be sliced, and fixing the cross-linked polyethylene steadily on the slicer; firstly slicing on one side, then changing a certain angle, and making a cable insulating layer present a trapezoidal shape; and slicing the top end of the cable trapezoidal insulating layer according to a ruler of the slicer. By reduction of the contact length between a blade of the slicer and the cross-linked polyethylene insulating layer, the method avoids the problem of reduction of the accuracy because of upwarping due to excessive force in the cutting process or cable arching due to loose clamping. The method also effectively reduces the damage of a sample to the blade.

Description

technical field [0001] The invention relates to the technical field of cross-linked polyethylene cable experiment sampling, in particular to an improved method for slicing based on a cross-linked cable slicer. Background technique [0002] Cross-linked polyethylene (XLPE) is not only widely used in medium and low-voltage power transmission projects, but also in high-voltage and ultra-high-voltage power transmission systems due to its superior electrical properties, good thermal properties and mechanical properties. Nowadays, the relevant cables that have reached the designed operating life are tested and found to have good insulation performance, the relevant parameters still meet the standard requirements, and can still continue to operate. However, due to the lack of relevant theoretical demonstrations and a large number of experimental studies, the power grid operation department still dare not allow the cables to exceed the expiration date. run. For cables that have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/06
CPCG01N1/06
Inventor 赵一枫刘刚韩卓展谢月
Owner SOUTH CHINA UNIV OF TECH
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