Comprehensive evaluation method for aging degree of composite insulator umbrella skirt

Abstract

The invention discloses a comprehensive evaluation method for the aging degree of an umbrella skirt of a composite insulator. Measurement results of an infrared spectroscopy FTIR analysis method, a thermal stimulation current TSC analysis method and a scanning electron microscope SEM analysis method are obtained, a Bayesian network algorithm is utilized to optimize different test methods to obtainthe possibility that each test result is in each aging state, and a maximum value discrimination criterion is utilized to realize comprehensive evaluation of the aging degree of the composite insulator umbrella skirt; more accurate technical support is provided for operation and maintenance personnel of the power transmission line to replace the composite insulator with serious aging degree in time, and safe and reliable operation of the power transmission line is guaranteed.

Description

technical field [0001] The present invention belongs to the research category stipulated in the fourth category "new material technology" of "high-tech fields supported by the state" (three) "polymer materials" item 4 "new rubber synthesis technology and new rubber materials", and involves In the research field of evaluation technology of aging state of silicone rubber materials, it specifically involves a comprehensive evaluation method for the aging degree of sheds of composite insulators. Background technique [0002] In recent years, with the development of organic polymer materials, composite insulators made of high-temperature vulcanized silicone rubber materials have been gradually applied to transmission lines, especially in lines in areas prone to pollution flashover accidents, and are favored by the power sector. Compared with traditional porcelain and glass insulators, composite insulators are fundamentally different in material and structure. Due to their advanta...

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Problems solved by technology

Although the appearance inspection and hydrophobicity inspection are simple and easy to operate, it is difficult to truly reflect the internal aging state of the composite insulator, and it is greatly affected by the subjective factors of the inspector; some studies have shown that although the hardness of the shed of the insulator can reflect the aging state to a certain extent degree, but the hardness change is also greatly affected by the formula and manufacturing process; FTIR is often used in the laboratory to detect and analyze the absorption peak area of ​​the Si-O-Si main chain and Si-CH3 side chain to judge the aging degree of the insulator, and the insulator The silica in the raw material contains Si-O-Si bonds, and the modified silica contains hydrophobic substances containing Si-CH3 bonds, which will affect the detection results; XPS detection is not only expensive, but also Requires extremely complex operating procedures in the laboratory

Therefore, it is not accurate to evaluate the aging degree of silicone rubber materials only through the test results of a certain property, so the validity of the test results is still open to question

[0005] Therefore, it is urgent to propose a comprehensive evaluation method for the aging degree of various performance test results of composite insulator sheds, to eliminate the inaccuracy of the detection method for the aging degree of composite insulator sheds, and to provide scientific criteria for the formulation of composite insulator rotation strategies. Economical, efficient and scientific operation and maintenance of power grid

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