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Extraction method for extracting discharge ultraviolet imaging quantization parameters of gray scale-based electrical device

A technology of electrical equipment and ultraviolet imaging, applied in the field of data processing, can solve the problems of quantitative description error, loss, and inability to describe the discharge intensity, etc., and achieve the effect of accurate discharge amount

Active Publication Date: 2017-07-11
贵州众创巨电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photon number is directly read out by the instrument. The photon number of the ultraviolet imager has a very complicated nonlinear relationship with the discharge amount, gain, and observation distance. As the discharge amount increases, the photon number will first increase and then decrease. In actual engineering The application is very difficult, and when there are multiple discharge points in the detection area, the number of photons cannot describe the discharge intensity of each point
The spot area method is to first binarize the ultraviolet image, and the discharge area is represented by a binarized spot. The quantification method using the spot area is to calculate the number of pixels of the spot in the discharge area. There is no difference in the discharge intensity in the discharge area, and the discharge area The discharge intensity in the default is the same, but the actual electrical equipment discharge, the discharge intensity of the discharge area may not be exactly the same, and the original data of one dimension is lost in the binarization process, so the simplification of this method will bring great advantages to the quantitative description of the discharge. big error

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  • Extraction method for extracting discharge ultraviolet imaging quantization parameters of gray scale-based electrical device
  • Extraction method for extracting discharge ultraviolet imaging quantization parameters of gray scale-based electrical device
  • Extraction method for extracting discharge ultraviolet imaging quantization parameters of gray scale-based electrical device

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experiment example 1

[0053] Such as image 3Shown is a schematic diagram of the corona discharge ultraviolet video processing results of transmission lines. The left side is the original image of a certain frame of ultraviolet video, and the right side is the filtered image of the frame image. After grayscale conversion, the equivalent spot area is calculated to be 10878.8549, and As a comparison, if the binarized equivalent spot area calculation method is used, the obtained equivalent spot area is 13310.7569.

experiment example 2

[0055] Extraction Algorithm Error Analysis

[0056] The error in the calculation of the ultraviolet equivalent spot area comes from filtering and binarization. The size and gray value of the ultraviolet spot area correspond to the discharge intensity of the electrical equipment.

[0057] During the filtering process, in order to filter out interference factors without losing effective light spots as much as possible, the present invention adopts two conditions of light spot area and light spot position. First of all, it is considered that the large light spot is an effective light spot, and the small light spot near the large light spot is an effective light spot. Therefore, only the small light spots that are far away from the large light spot are filtered out in the filtering, which greatly reduces the introduction of errors. Secondly, the present invention uses the gray value to directly participate in the calculation of the equivalent spot area, which contains complete d...

experiment example 3

[0060] Use this method to obtain the corona discharge intensity of 10*LGJ-720 wires under three different conditions of dry, rain and wet wires. see results Figure 6 ,Depend on Figure 6 It can be seen that as the voltage increases, the area of ​​the corona discharge spot also increases, which is in line with the actual situation, thus confirming the scientificity and accuracy of using the grayscale image quantization parameter compared with the binarization parameter.

[0061] The gray-scale-based method for extracting quantitative parameters of electrical equipment discharge ultraviolet imaging is reasonably designed. The present invention uses light spots with gray-scale values ​​to describe the discharge area, and the size of the gray-scale value represents the size of the discharge in this area. In the past, it was impossible to describe the strength of the discharge in the discharge area, and it will also describe the discharge intensity and discharge position of the e...

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Abstract

The invention discloses an extraction method for extracting the discharge ultraviolet imaging quantization parameters of a gray scale-based electrical device. The method comprises the steps of 1, preprocessing an ultraviolet image: firstly, selecting a valid image, specifically: 1) extracting an original ultraviolet image of each frame out of an original ultraviolet video through the image processing software; 2) subjecting the above original ultraviolet image to grey level transformation; 3) conducting the two-value transformation; 4) conducting the mathematical morphological filtering; 5) filtering out interference light spots; 2, calculating the equivalent spot area through weighing grayscale coefficients, specifically: 1) selecting a valid image ; 2) conducting the gray-scale treatment; 3) calculating the equivalent spot area. According to the invention, the description of a discharge region is realized based on light spots with gray values. Therefore, the problem in the prior art that the strength of the discharge capacity in the discharge region cannot be described can be solved. Moreover, the discharge strength and the discharge position of electrical device can be described more accurately.

Description

technical field [0001] The invention relates to the technical field of data processing, in particular to a method for extracting quantitative parameters of electrical equipment discharge ultraviolet imaging based on grayscale. Background technique [0002] After the high-voltage equipment is put into operation, due to reasons such as rough surface, pollution, structural defects, and poor conductor contact, the field strength of the equipment will be unevenly distributed, resulting in discharge phenomena such as corona and arcing. Wire corona is an important factor in the selection of wires for EHV and UHV transmission lines. If it is not controlled within a reasonable range, wire corona will affect the electromagnetic environment and transmission energy loss. At the same time, if the control of corona parameters is too strict, the cost of power transmission will be too high. Therefore, the corona performance of the conductor needs to be controlled within a reasonable range ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/60G01R31/12
CPCG01R31/1218G06T7/0002G06T2207/10016G06T2207/20024
Inventor 周广洋刘云鹏钟平张凯元钟正王江伟王博文齐小涵
Owner 贵州众创巨电力科技有限公司
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