Discharge ultraviolet imaging quantization parameter extraction method of high-voltage electric equipment

Abstract

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. Its detection signal is the ultraviolet signal in the 240-280nm band radiated by the discharge, and the output is an ultraviolet image. Compared with traditional discharge detection methods, 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 positioning of the discharge position. Therefore, in recent years, the ultraviolet imaging method has been widely used in the discharge detection and equipment maintenance of the power system. [0003] The use of ultraviolet imaging method to analyze the severity of discharge, evalu...

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Problems solved by technology

[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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