A method for extracting quantitative parameters of high-voltage electrical equipment discharge ultraviolet imaging
A technology of high-voltage electrical equipment and quantitative parameters, applied in the field of data processing, can solve problems such as quantitative analysis, discharge intensity of difficult discharge points, and quantification of difficult discharges, and achieve the effects of improving accuracy, eliminating adverse effects, and facilitating interpretation
Active Publication Date: 2016-02-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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[0003] Using ultraviolet imaging method to analyze the severity of discharge, evaluate the operating status of equipment, realize the pattern recognition of discharge defects and flashover warning needs to extract relevant quantitative parameters. At present, the "photon number" parameter is generally used in engineering, but in There are many deficiencies in this parameter in practical applications, mainly in the following points: ① There is a complex nonlinear relationship between this parameter and the gain setting of the UV imager and the observation distance, and it is difficult to quantify the discharge; ② When the UV imager When there are multiple discharge points in the field of view, this parameter is the total number of photons within the field of view of the instrument, and it is difficult to quantitatively analyze the discharge intensity of each discharge point; ③ this parameter does not contain the location information of the discharge point
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[0071] 1 Extraction of quantification parameters of discharge intensity
[0072] 1.1 Features of UV images
[0073] To process the ultraviolet image and extract the relevant quantitative parameters, it is necessary to first analyze the characteristics of the ultraviolet image, and then use an appropriate algorithm to realize it according to the image characteristics. In the present invention, a typical ultraviolet image in practice is used as an example to illustrate its characteristics, figure 1 It is an ultraviolet image taken before snowfall of a 220kV substation insulator string. The size of the image is Pixels, the temperature at the time of shooting is close to 0 degrees, the relative humidity is 97%, and the UV imager model is CoroCAM504.
[0074] The discharge image is displayed as a white area in the ultraviolet image. Analysis of the above image shows that there are three obvious discharge points on the insulator string. The image brightness of the discharge ar...
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The invention provides a discharge ultraviolet imaging quantization parameter extraction method of high-voltage electric equipment. Firstly, by means of digital image grey level transformation, a threshold division algorithm, a morphological filter algorithm and a small region image elimination algorithm, a discharge region image in an ultraviolet image of the high-voltage electric equipment is segmented, then a boundary point of each region is extracted by means of a multi-region boundary tracking algorithm, and on the basis of the preceding operation, one or more geometrical parameters of a light spot are calculated and used for carrying out quantitative analysis on discharge strength of the high-voltage electric equipment. According to the method, adverse influences of gain of an ultraviolet imager and observation distances on analysis results can be eliminated, quantitative analysis can be carried out on discharge strength of a plurality of discharge points, and accuracy of analysis results is greatly improved. Besides, due to the fact that the parameter comprises position information of the discharge points, and conditions are created for accurate positioning of discharge defects.
Description
technical field [0001] The invention relates to a method for extracting quantitative parameters of discharge ultraviolet imaging of high-voltage electrical equipment based on image processing, and belongs to the technical field of data processing. Background technique [0002] Solar-blind ultraviolet imaging is a visual discharge detection method. The detection signal is the ultraviolet light signal in the 240-280nm band radiated by the discharge, and the output is an ultraviolet image. Compared with the traditional discharge detection method, the solar-blind ultraviolet imaging method can intuitively It shows the discharge profile, and has the advantages of long detection distance, high sensitivity and accurate discharge position positioning. Therefore, in recent years, ultraviolet imaging method has been widely used in discharge detection and equipment maintenance of power systems. [0003] Using ultraviolet imaging method to analyze the severity of discharge, evaluate the...
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IPC IPC(8): G01R31/12G06T7/00
Inventor 王胜辉律方成冯宏恩
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)