Detection method for tree-like aging defect of cable insulation material

A technology for cable insulation and detection methods, which is applied in the direction of optical testing for flaws/defects, etc. It can solve the problems of low magnification, inability to obtain detailed three-dimensional images of electrical branches, and achieve high experimental efficiency.

Inactive Publication Date: 2013-05-22
TSINGHUA UNIV
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Problems solved by technology

However, the detection method for dendritic aging defects of polymer insulating materials can only obtain two-dimensional electrical dendrite images with low magnification, and canno...

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  • Detection method for tree-like aging defect of cable insulation material

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Embodiment Construction

[0017] The detection method for dendritic aging defects of cable insulation materials proposed by the present invention comprises the following steps:

[0018] (1) Prepare the cable insulation material to be tested into a cuboid sample to be tested, such as figure 1 As shown, wherein 2 is a rectangular parallelepiped sample to be detected, the length of the rectangular parallelepiped is 40 mm, the width is 30 mm, and the thickness is 5 mm. A semiconductive silicone rubber 1 is arranged on one side of the width direction of the sample to be detected. A needle electrode 3 is arranged on the silicone rubber, and the needle electrode 3 is embedded in the sample 2 to be tested, and the other side of the sample to be tested in the width direction is the ground electrode 4; the vertical distance between the tip of the needle electrode 3 and the ground electrode is 3±0.1 mm. The needle electrode 3 adopts a pre-embedded preparation process, that is, the needle electrode 3 is placed in...

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Abstract

The invention relates to a detection method for a tree-like aging defect of a cable insulation material, belonging to the technical field of electrical equipment insulation diagnosis. The detection method comprises the steps of preparing a cable insulation material to be detected into rectangular samples to be tested, arranging a semiconductive silicon rubber and a pin electrode, and applying high pressure on a tip of the pin electrode; forming a defect channel in the samples to be tested, eliminating the high pressure applied to the pin electrode, and removing the semiconductive silicon rubber and the pin electrode from the sample to be tested; injecting a liquid with fluorescence staining function into the sample to be tested along the detect channel of the sample to be tested; and slicing the sample, scanning with a super-resolution fluorescence microscope, processing an obtained optical microscopic image and a fluorescence microscopic image, and obtaining a feature image of the tree-like aging defect of the cable insulation material to be tested. The method is simple and fast, has high experimental efficiency, is beneficial to diagnosis of the cable insulation defects from the point of view of form, and provides a key image basis for theoretical research of electric tree-like aging.

Description

technical field [0001] The invention relates to a detection method for dendritic aging defects of cable insulation materials, belonging to the technical field of electric equipment insulation diagnosis. Background technique [0002] Dendritic aging is an electrochemical aging phenomenon that occurs in polymers. It is commonly found in cable insulation polymer materials. It is named because the shape of the discharge destruction channel is similar to a tree branch. Dendritic aging has a non-negligible impact on the reliability and life of insulating materials. It can cause insulation breakdown of materials under the condition of long-term operation far below the dielectric strength, which will bring significant losses to the power system. Therefore, it is of great significance to carry out in-depth and systematic research on the dendritic aging characteristics of cable insulation materials to ensure the safe and stable operation of the power grid. At the same time, theoretica...

Claims

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Application Information

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IPC IPC(8): G01N21/91
Inventor 周远翔张旭刘睿张云霄
Owner TSINGHUA UNIV
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