Method for detecting electrical aging of silicone rubber composite insulator

Abstract

The invention discloses a method for detecting electrical aging of a silicone rubber composite insulator. The method for detecting the electrical aging of the silicone rubber composite insulator includes a first step of taking a high-voltage-side shed of the silicone rubber composite insulator of a running line as a sample, and a second step of collecting micro-Raman spectra on the surface of the sample, and judging the degree of the electrical aging of the sample according to the fact that whether an obvious Raman peak exists at the position of 2906cm-1, 2966cm-1, 3371cm-1, 3437cm-1, 3524cm-1. The method for detecting the electrical aging of the silicone rubber composite insulator has the advantages of being less in sample, short in detection time and easy and convenient to conduct. Detection can be finished without the need of complicated treatment of the sample. The Raman peak is used as a tool of analysis of the electrical aging of the silicone rubber composite insulator, so that subjective factors such as a man-made factor and an environment factor are eliminated and the accuracy is improved.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to a detection method for electrical aging of a silicone rubber composite insulator. Background technique [0002] Silicone rubber composite insulators have been widely used at home and abroad for their advantages of light weight, high mechanical strength, strong hydrophobicity and hydrophobic mobility, high pollution flashover voltage resistance, simple manufacturing process, unexpected zero value, and easy maintenance. At present, there are more than 4 million composite insulators running on the grid in my country, and it is one of the countries that use the largest amount of silicone rubber composite insulators in the world. With the increase of the service life, the electrical aging of the silicone rubber composite insulator shed material has gradually become the focus of attention in the power system. [0003] Silicone rubber materials are not only affected by environment...

AI Technical Summary

Problems solved by technology

The energy generated by the discharge or arc discharge of silicone rubber during operation decomposes the oxygen in the surrounding air to generate active oxygen atoms. The active oxygen atoms combine with the oxygen in the air to form ozone, and the ozone is unstable. Large, more than 900kJ / mol, can cause the breakage of the silicon-oxygen chain of the silicone rubber, destroy the performance of the silicone rubber, and the action of the discharge arc causes the local high temperature on the surface of the silicone rubber and the destruction of the molecular chain, forming a conductive carbonization channel on the surface of the silicone rubber , leading to the decline of the mechanical and electrical properties of the silicone rubber material, and the reduction of the organic content of the material after the discharge arc ablation and the relative increase of the inorganic content and the exposure of the inorganic substances make the surface of the silicone rubber hydrophobic and hydrophobic Migration and insulation performance drop

[0004] At present, although the insulator industry has proposed some indicators for evaluating the degree of electrical aging of materials, such as color change and hydrophobicity, it can be seen that the existing evaluation indicators are mainly judged from the changes in insulator performance. On the one hand, some The characteristics need to be observed after aging to a certain extent, and most indicators can only be used as diagnostic criteria after the aging process is accelerated to a certain extent, which is not sensitive enough to the aging change process, which is not conducive to early judgment of aging and timely detection of potential Dangerously Degraded Insulators

Images