Method for evaluating service life of composite insulator

Abstract

The invention discloses a method for evaluating service life of a composite insulator. The method comprises the following steps: cleaning the outer umbrella skirt of the composite insulator, uniformly cutting multiple test points at concentric positions in the center of a first outer umbrella skirt at a high-voltage end, drying, and acquiring the infrared spectrum information in an ATR-FTIR spectrograph; selecting the characteristic peaks -Si-O- and -CH3 in the spectrum chart to serve as representative characteristic peaks of inorganic and organic components in the outer umbrella skirt of the composite insulator; calculating the peak area ratio of the characteristic peaks -Si-O- and -CH3, and solving the average value of the multiple test points to serve as the -Si-O-/-CH3 ratio of the composite insulator; testing different composite insulators according to the method; and evaluating the service lives of different composite insulators according to the -Si-O-/-CH3 ratio of the different insulators, wherein the larger the ratio is, the shorter the service life is, otherwise, the smaller the ratio is, the longer the service life is. According to the method disclosed by the invention, the problem of detection and sample preparation complexity is solved; the problem that the spectrum peak is extremely complicated so as to influence characteristic quantity extraction is solved; the purpose of accurate quantitative detection of FTIR can be realized; and moreover, the detection result is not influenced by manufacturers and formulas.

Description

technical field [0001] The invention belongs to the technical field of composite insulators, in particular to a method for evaluating the service life of composite insulators. Background technique [0002] According to statistics, as of December 2010, there were 11,336,713 strings (branches) of insulators in operation on AC / DC transmission lines with a voltage level of 66kV and above, of which 4,196,235 strings (branches) of composite insulators, accounting for 37.02% of all types of insulator strings (branches). In 2013, through the official bidding of the State Grid, the number of composite insulators with a voltage level above 35kV was 891,958, and the composite insulators that are not included in the bidding of the State Grid, such as the independent bidding of the power grids in various regions, the renovation of local lines, and the 10kV distribution network lines, etc. For insulators, the total actual demand far exceeds the bidding quantity. It is conservatively esti...

AI Technical Summary

Problems solved by technology

However, the proportion of composite insulators currently operating in the power grid is increasing, and simpl

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