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A method for quickly measuring cross-linking degree of xlpe cable on site

A technology of cross-linking degree and cable, which is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc. It can solve the problems of low detection accuracy, inability to perform rapid on-site detection, and long detection time.

Active Publication Date: 2021-07-06
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the existing XLPE cross-linking degree detection method has the problems of long detection time, low detection accuracy, and inability to carry out on-site rapid detection. This method is based on differential scanning calorimetry (DSC) for rapid and accurate determination of on-site XLPE cross-linking degree, to achieve accurate measurement and judgment of XLPE cable insulation cross-linking degree, and to provide important information for judging cable insulation quality. in accordance with

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  • A method for quickly measuring cross-linking degree of xlpe cable on site
  • A method for quickly measuring cross-linking degree of xlpe cable on site
  • A method for quickly measuring cross-linking degree of xlpe cable on site

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Embodiment 1

[0099] (1) Preparation of XLPE samples with different degrees of crosslinking

[0100] 2.0% DCP cross-linking agent was added to low-density polyethylene (LDPE), and then 5 groups of XLPE samples with different cross-linking degrees were prepared using the T-t control scheme shown in Table 2. Where T is the crosslinking temperature and t is the crosslinking time. They are numbered 1# to 5# in sequence according to the increasing degree of crosslinking.

[0101] Table 2 T-t control scheme for production of known crosslinking degree XLPE by peroxide DCP

[0102] XLPE DCP resolution Crosslinking temperature T crosslinking time t Sample 1 0％ 110℃ 5min Sample 2 25％ 130℃ 33min Sample 3 50％ 150℃ 10min Sample 4 75％ 150℃ 19min Sample 5 100％ 170℃ 2min

[0103] (2) Measurement of sample crystallinity and calculation of crosslinking degree

[0104] The crystallinity of 5 groups of samples was measured by the method of the...

Embodiment 2

[0108] (1) Preparation of XLPE samples with different degrees of crosslinking

[0109] Four groups of XLPE samples with different cross-linking degrees were prepared by using YJ-10 cross-linking material and the T-t control scheme shown in Table 4. Where T is the crosslinking temperature and t is the crosslinking time. They are numbered 1# to 4# in sequence according to the increasing degree of crosslinking.

[0110] Table 4 T-t control scheme for production of XLPE with known crosslinking degree by peroxide DCP

[0111] XLPE Crosslinking temperature T crosslinking time t Sample 1 120℃ 10min Sample 2 142℃ 15min Sample 3 147℃ 15min Sample 4 160℃ 10min

[0112] (2) Measurement of sample crystallinity and calculation of crosslinking degree

[0113] Using the method of the present invention to measure the crystallinity of 4 groups of samples, and calculate the degree of crosslinking of the samples, and obtain the crystallinity a...

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Abstract

The invention discloses a method for quickly measuring the crosslinking degree of XLPE cables on site, which solves the problems of long detection time, low detection accuracy and inability to perform rapid detection on site in the existing XLPE crosslinking degree detection method. This method utilizes the law that the crystallinity of the material decreases when the cross-linking degree of XLPE increases. First, XLPE samples with different cross-linking degrees are prepared and the cross-linking degree of the samples is calibrated by gel method. Then use the DSC instrument to measure the endothermic melting curve of the cable insulation sample for these samples, calculate the crystallinity of the material, and then find out the corresponding relationship between the crystallinity and the degree of cross-linking of the XLPE samples and determine the relationship between the degree of cross-linking calculated by the degree of crystallinity Mode. Finally, the crystallinity of the material with unknown cross-linking degree was measured by DSC instrument, and its cross-linking degree was calculated. Compared with the prior art, the invention not only can quickly detect the cross-linking degree of the XLPE cable insulation prepared by various cross-linking methods on site, but also has no pollution and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of insulation quality detection in power cable network access detection, in particular to a method for quickly measuring the cross-linking degree of XLPE cables on site. Background technique [0002] With the continuous development of my country's urban economy and the continuous improvement of people's living standards, the power demand of urban power grids is increasing day by day. Due to the limitation of line corridors, the requirements of landscaping, etc., modern urban power grids rely heavily on power cables for power transmission. Cross-linked polyethylene (XLPE) cables have been widely used in urban distribution networks due to their excellent mechanical, heat-resistant, and electrical properties. However, although there are many wire and cable manufacturers in my country, due to low production investment and low technical content, small-scale enterprises account for the vast majority. Most of thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 刘曦冯杰蔡钢周凯李康乐张桥峰
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST