Method for judging alternating current flashover discharge of iced insulator

Abstract

The invention provides a method for judging the risk of alternating current flashover discharge of an iced insulator. An image processing method based on a gray level co-occurrence matrix is providedto judge the surface flashover discharge condition of the iced insulator; the starting, propagation, extinguishing and reignition processes of the electric arc can be visually reflected, the dischargemechanism of the ice flashover process is disclosed by extracting four statistical parameters of the gray level co-occurrence matrix, different numerical values of the statistical parameters well correspond to different stages of the electric arc discharge process, and the judgment method for the flashover risk of the ice-coated insulator is provided.

Description

Technical field [0001] The invention relates to the technical field of AC flashover discharge of ice-coated insulators, in particular to a method for judging AC flashover discharge of ice-coated insulators based on gray-level co-occurrence matrix analysis. Background technique [0002] In the severe rain and snow weather conditions formed in winter and spring, it is easy to cause serious icing of insulators. The ice ridges generated during the growth of icing will change the distribution of the electric field. At the same time, the migration of ions during the melting of ice makes The conductivity of the water film on the ice-coated surface increases, which can easily lead to uncontrollable and multi-faceted ice melting flashover accidents, which will seriously damage the electrical performance of the insulators, cause great harm to the entire power grid dispatching, and seriously threaten the power grid. safe operation. [0003] Ice-coated flashover is a complex discharge phenome...

AI Technical Summary

Problems solved by technology

In order to reduce the occurrence of ice flash accidents, many researchers have studied the discharge mechanism and insulation performance of ice-coated insulators. The results show that due to the randomness of partial arc discharge and the complexity of the ice accumulation process, it is difficult to determine the arc The formation and propagation state on ice-coated insulators, so it is more difficult to determine the critical conditions for flashover to occur

In addition, although researchers have achieved some research results, they rarely study the process and mechanism of flashover from the perspective of extracting and analyzing the characteristic values ​​of discharge images on the surface of ice-coated insulators

Moreover, most studies on the flashover characteristics of ice-coated insulators are qualitative descriptions, and there are few quantitative studies.

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