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

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...

AI Technical Summary

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 cannot obtain detailed three-dimensional images of electrical dendrites, so that the morphology and size of electrical dendrite damage channels cannot be obtained. Key information for diagnosis

Images