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External insulation discharging detecting method based on ultraviolet light spots

An external insulation and ultraviolet light technology, applied in the field of detection, can solve problems such as the inability to guarantee the detection accuracy and detection efficiency of external insulation discharge, the inability to extract the area of ​​ultraviolet light spots, etc., to improve the accuracy and detection efficiency, strong anti-interference ability, The effect of a high degree of automation

Inactive Publication Date: 2014-06-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In summary, the existing external insulation discharge detection method based on ultraviolet light spots cannot accurately and quickly extract the area of ​​ultraviolet light spots, and cannot guarantee the accuracy and detection efficiency of external insulation discharge detection, and further research is needed

Method used

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  • External insulation discharging detecting method based on ultraviolet light spots
  • External insulation discharging detecting method based on ultraviolet light spots
  • External insulation discharging detecting method based on ultraviolet light spots

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Experimental program
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Embodiment 1

[0086] attached image 3 It is an ultraviolet discharge image with a single spot on an insulator string obtained by an ultraviolet imager, and the area of ​​the discharge spot is 345 pixels. The results of edge operator processing are attached Figure 4 ~ Figure 8 shown. The threshold is obtained by the adaptive threshold method, and the image is binarized based on the threshold to obtain a binary image, and the image is opened by mathematical morphology to obtain the image as attached Figure 9 shown. During the binarization process, the optimal threshold is manually adjusted continuously, and the obtained binary image is processed by mathematical morphology, and the image obtained is as attached Figure 10 ~ Figure 12 shown. The active contour model obtains the edge contour and the original image as attached Figure 13 shown.

[0087] attached by Figure 4 ~ Figure 8It can be seen that for the actual ultraviolet discharge image, the detection results obtained by the c...

Embodiment 2

[0089] attached Figure 14 It is the ultraviolet discharge image of multiple light spots on the insulator string obtained by the ultraviolet imager, and the light spot pixels from top to bottom are 88, 168, 105 and 410 pixels respectively. The processing results of conventional edge detection operators are attached Figure 15 ~ Figure 19 shown. Use the adaptive threshold method to binarize the image to obtain a binary image, and then use mathematical morphology to open the operation according to the obtained image to obtain the image as attached Figure 20 shown. During the binarization process, the optimal threshold value is manually adjusted continuously, and the obtained binary image is processed by mathematical morphology, as shown in the attached image. Figure 21 ~ Figure 23 shown. Multiple edge contours and original images obtained by the active contour model are attached Figure 24 shown.

[0090] attached Figure 15 ~ Figure 19 with attached Figure 9 ~ Figure...

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Abstract

The invention provides an external insulation discharging detecting method based on ultraviolet light spots, and belongs to the technical field of detection. The external insulation discharging detecting method is used for increasing the accuracy and efficiency of external insulation discharging detection. The technical scheme of the invention is that: the external insulation discharging detecting method comprises the following steps of: firstly acquiring an ultraviolet discharging image of external insulation of electric transmission and transformation equipment by using an ultraviolet imager, obtaining edge contours of respective light spots of the ultraviolet discharging image through an active contour modeling method, calculating areas of the respective light spots according to the edge contours of the light spots, solving ratios of the areas of the respective light spots to the area of the largest light spot, and judging discharging degree and whether external insulation discharging exists. The external insulation discharging detecting method has the advantages of high calculation accuracy, high interference resistance, high automation degree and the like, and the accuracy and efficiency of the external insulation discharging detecting are greatly increased.

Description

technical field [0001] The invention relates to a method for detecting external insulation discharge faults of power transmission and transformation equipment and judging the discharge degree, belonging to the detection technical field. Background technique [0002] Power transmission and transformation equipment operates in an atmospheric environment, and it is easy to cause the electric field distortion of its external insulation due to wet pollution, ice coating, etc., and then generate discharge. Discharge is the premise of flashover and the root cause of polymer material aging, so it is necessary to detect and study the discharge of external insulation. External insulation discharge is accompanied by phenomena such as sound, light, heat, and current, and corresponding methods such as sound, ultraviolet, infrared, and leakage current can be used for detection. Among them, the detection method based on ultraviolet has broad application prospects due to its non-contact adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12G01B21/28G01B21/20
Inventor 律方成戴日俊徐志钮
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)