Monitoring method and system for transformer composite insulator bushing based on raindrop recognition

Abstract

A monitoring method and system for transformer composite insulator bushings based on raindrop recognition, including acquiring corresponding images of transformer composite insulator bushings to be detected, performing image preprocessing, and identifying natural raindrops on the images. If the recognition result shows that there are natural raindrops on the disk surface, then Use the improved Canny operator edge extraction algorithm to extract the edge of the current top-level disk preprocessing image with raindrops, and then use the mathematical morphology algorithm to repair the extracted edge image; according to the hydrophobicity feature, based on the probability neural network PNN Obtain a hydrophobicity rating. The present invention proposes for the first time to use natural raindrops to cause the shape change of the top disk image of the composite insulator bushing, and use image processing and analysis technology to automatically monitor the hydrophobicity level of the transformer composite insulator bushing, that is, the pollution level, effectively avoiding pollution flashover of the composite insulator bushing accidents and improve the safety and reliability of transformer operation.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of electrical primary equipment, in particular to a technical solution for monitoring the hydrophobicity of composite insulator bushings of automatic transformers based on raindrop identification. Background technique [0002] Affected by the on-site operating environment and operating conditions, as the main insulating equipment of the transformer, the transformer bushing is subjected to the test of electrical strength and mechanical strength. In the process of industrialization development, the environment has also deteriorated. The pollution in the air accumulates on the surface of the transformer composite insulator casing umbrella, which reduces the hydrophobicity of the casing. In a humid environment, it may induce pollution flashover accidents and affect the power system. Safe and stable operation, so it is particularly important to conduct on-line detection of hydrophobicity of transforme...

AI Technical Summary

Problems solved by technology

Since the transformer composite insulator bushing is not easy to disassemble, the method of spraying water on site and then detecting its hydrophobicity is generally used, that is, spraying water on the surface of the transformer composite insulator with a fire truck, and then using image processing and analysis to analyze the collected data. Processing and analysis of water spray images requires the transformer to be powered off, which affects the continuity of power supply. On the other hand, the fire truck sprays a large amount of water, and the stains will be washed away by the strong water flow, which affects the reliability of detection.

Images