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Method for detecting corona discharging and device thereof

A technology of corona discharge and detection method, which is applied in the direction of testing dielectric strength, etc., and can solve problems such as difficult statistical analysis, large variation range of photon number, unfavorable quantification of electrical equipment discharge process, etc.

Active Publication Date: 2009-10-07
STATE GRID HUBEI ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the deepening of the experimental research, we found that the number of photons in the corona discharge detected by the ultraviolet imager has a large range of changes per unit time, which is difficult to statistically analyze, and the test results are related to the field experience of the experimenters, which is easy to produce measurement results. In particular, it is not conducive to quantify the discharge process of electrical equipment, so it is not easy to predict the development trend of equipment failure

Method used

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  • Method for detecting corona discharging and device thereof
  • Method for detecting corona discharging and device thereof
  • Method for detecting corona discharging and device thereof

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Experimental program
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Effect test

Embodiment 1

[0086] A corona discharge detection method, the steps are:

[0087] 1. Ultraviolet imager imaging;

[0088] Through the ultraviolet imager lens and filter system, the ultraviolet light is projected onto the black and white camera to detect the corona in the blind area of ​​the sun, and the visible light image is directly projected onto the color camera, and the ultraviolet light is projected onto the black and white camera image and the visible light image two The image is registered and fused by DSPs, so that the output image has both background and ultraviolet signals, and presents a color image;

[0089] 2. Collect the imaging data into the computer through the image acquisition card;

[0090] The image acquisition card collects the imaging data acquired by the ultraviolet imager into the computer, and realizes the dynamic conversion from color to HSL and the acquisition of partial images through the PCI-1411 image acquisition card.

[0091] 3. Processing by image process...

Embodiment 2

[0145] The present invention includes an ultraviolet imaging module 1 , an image acquisition module 2 , an image processing module 3 and a display module 4 . It is characterized in that: the image acquisition module 2 is connected to the ultraviolet imaging module 1 and the image processing module 3 respectively, and the image processing module 3 is connected to the image acquisition module 2 and the display module 4 respectively. Its special feature is that the obtained ultraviolet imaging image is subjected to layer extraction, spatial filtering, and then thresholded to transform the image into a binary image. All pixel values ​​​​in the threshold range are assigned a value of 1. The pixel value outside the interval is assigned a value of 0, and the sum of the area of ​​the "1" value in the statistical binary image, and its ratio to the total area of ​​the entire image is used as a characterization parameter of the corona discharge intensity.

[0146] The ultraviolet imaging...

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Abstract

The present invention discloses a method for detecting corona discharging and a device thereof. The method includes steps as follows: A. ultraviolet imagery instrument image-forming; B. collecting the image-forming data to a computer through an image collecting card; C. processing through an image processing program: processing data collected by an image collecting module through the image processing program, the image processing includes: intercepting picture in the video, extracting image, processing image layer extractor to the image, spatial filtering processing, then valve quantity, stating an irradiancy area and a total area in the image, then comparing and obtaining the irradiancy area ratio, finally, obtaining the irradiancy area ratio for characterizing corona strength which includes: a ultraviolet imagery module, an image collecting module, an image processing module, a display module, the image collecting module connects with the ultraviolet imagery module and the image processing module, the image processing module connects with the image collecting module and the display module respectively. The device has simple operation, stable testing and reliable data which can provide direct and obvious data for user.

Description

technical field [0001] The invention relates to the technical field of insulation detection of electrical equipment in a power system, in particular to a corona discharge detection method. It also relates to a corona discharge detection device suitable for power transmission and transformation operation equipment in a power system, which is suitable for detecting and analyzing corona detection and fault judgment of power transmission and transformation operation equipment. Background technique [0002] The external insulation structure of most high-voltage electrical equipment in the power system has the characteristics of non-uniform electric field. In an extremely uneven electric field, when the applied voltage is high enough, before the air gap is completely broken down, there will be a thin luminous layer near the large curvature electrode (high voltage end), like a "halo", in the dark Seen more clearly, this discharge phenomenon is called "corona" discharge, and its sp...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 汪涛周文俊马斌易晓喻剑辉凃俊
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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