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Method and System for Evaluating the State of Cable Buffer Layer

A state evaluation and buffer layer technology, applied in instruments, measuring devices, using wave/particle radiation, etc., can solve the problems of lack of countermeasures for high-voltage cable buffer layer ablation, unverified, affecting the reliability of high-voltage cable operation, etc. Intuitive judgment, improved accuracy, and high detection efficiency

Active Publication Date: 2022-03-25
WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulation breakdown fault caused by the discharge ablation of the cable buffer layer is the only factor other than the external force damage, which seriously affects the operation reliability of the high-voltage cable
However, the buffer layer ablation of high-voltage cables lacks effective countermeasures, as well as inspection and detection methods and defect assessment methods
At the same time, because the defect characteristics of buffer layer discharge ablation are different from other defects of cable lines, it has not been verified that buffer layer ablation defects can be effectively detected through existing live-line or off-line maintenance equipment and technical means

Method used

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  • Method and System for Evaluating the State of Cable Buffer Layer
  • Method and System for Evaluating the State of Cable Buffer Layer
  • Method and System for Evaluating the State of Cable Buffer Layer

Examples

Experimental program
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Embodiment 2

[0087] The resistivity ρ of the buffer layer is 10 5 Ωmm, the remaining parameters of the tested cable are the same as those in Embodiment 1. From this, it can be calculated that the allowable distance of the tested cable is 118.6cm. Therefore, the cable is evaluated as: can continue to operate.

[0088] Such as figure 2 As shown, the cable buffer state evaluation system of the present invention is characterized in that it includes:

[0089] An acquisition unit 21, configured to acquire a perspective view of the cable under test;

[0090] Calculating the detachment unit 22, used to calculate the detachment length of the cable under test according to the perspective view of the cable under test; the detachment length is:

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Abstract

The present invention relates to the technical field of electrical testing, and more specifically, to a method and system for evaluating the state of a cable buffer layer. The method includes: obtaining a perspective view of the cable under test; Detachment length; the detachment length is: the actual detachment length between the corrugated aluminum protective sheath and the buffer layer in the tested cable; the allowable distance of the tested cable is calculated according to the parameters of the tested cable; the allowable distance is: the tested cable The allowed separation length between the corrugated aluminum protective sheath and the buffer layer; compare the separation length and the allowable distance of the tested cable to obtain the evaluation result of the tested cable. The invention can intuitively and accurately evaluate the state of the buffer layer.

Description

technical field [0001] The invention relates to the technical field of electrician detection, more specifically, to a method and system for evaluating the state of a cable buffer layer. Background technique [0002] The technological level of my country's power cable insulation manufacturing has reached the world's advanced level. However, since 2011, there are still many insulation breakdown failures caused by buffer layer ablation of high-voltage cross-linked polyethylene (XLPE) insulated cables in operation across the country. According to the preliminary analysis of more than dozens of body breakdown faults and defects in Beijing, Shanghai, Jiangsu, Hunan and other places, it is found that the fault phenomena are highly consistent. The insulation breakdown fault caused by the discharge ablation of the cable buffer layer is the only factor other than the external force damage, which seriously affects the operation reliability of the high-voltage cable. However, the buffe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/04G01B15/00
CPCG01N23/04G01B15/00
Inventor 张静陈佳程林胡胜男胡萍江翼李文杰王浩明刘衍宏张杰
Owner WUHAN NARI LIABILITY OF STATE GRID ELECTRIC POWER RES INST
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