Detection method of insulator surface water content based on hyperspectral technology

Abstract

The invention discloses a detection method of insulator surface water content based on hyperspectral technology. The detection method comprises the following steps: shooting insulator surfaces with known different surface water contents by utilizing a hyperspectral imager so as to obtain a corresponding hyperspectral image, performing black-white correction, multiplicative scatter correction and smooth denoising on the hyperspectral image to obtain a hyperspectral line Xi of the surface water content Si, and then obtaining a water content BP neural network prediction model; shooting to obtaina hyperspectral image of a to-be-detected insulator, performing black-white correction, multiplicative scatter correction and smooth denoising to obtain the hyperspectral line X0 of the to-be-detectedinsulator, inputting the hyperspectral line X0 of the to-be-detected insulator into a prediction model to obtain the surface content of the to-be-detected insulator. Through the method disclosed by the invention, the non-contact real-time detection can be performed on the field insulator under an electrified condition, the operation is simple and the realization is simple; and the method can provide reliable and accurate test evidence for the dampproof and moisture-resistant design, manufacturing and maintenance of the insulator.

Description

technical field [0001] The invention relates to a method for detecting water content on the surface of an insulator. Background technique [0002] Insulators are one of the important external insulation devices in power transmission and transformation systems. With the aggravation of air pollution, the pollution on the surface of insulators is also becoming more and more serious. Compared with clean insulators, the dirty but dry polluted insulators have little difference in surface insulation performance; however, when the air humidity increases such as heavy fog, dew, and light rain, the water content on the surface of the insulator increases, and the dirt absorbs water. However, when wet, the insulation performance of polluted insulators will be significantly reduced, and pollution flashover accidents will easily occur, causing huge economic losses. When the pollution layer is damp, the soluble conductive substances in the pollution dissolve in the water, forming a condu...

AI Technical Summary

Problems solved by technology

[0003] There are currently two main measurement methods for the water content of the insulator surface. One is to use special electrodes and circuits to measure the conductance of the dirty layer after the insulator surface is wet, and then convert it into the water content of the insulator surface; the equipment has high requirements and must be used in power transmission and transformation When the system is powered off, it cannot be carried out on-site; and the measured value is greatly affected by the temperature and humidity of the environment, making it difficult to apply

The other is to remove the insulator from the power transmission and transformation system, weigh the insulator, then dry the insulator, and measure the weight of the insulator after drying to obtain the water content of the insulator; , The operation time of reinstalling the insulator is long, which will cause a long-term power outage of the power transmission and transformation system, making it difficult to apply this method

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