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Insulator surface charge inversion method based on digital image processing technology

A digital image and surface charge technology, applied in image data processing, image analysis, image enhancement, etc., can solve the problems of complex calculation and insufficient precision, and achieve the effect of good filtering effect, filtering interference, and scientific filtering coefficient value

Active Publication Date: 2020-10-16
WUHAN UNIV
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Problems solved by technology

[0005] The present invention provides an inversion method for insulator surface charge based on digital image processing technology to solve the problems of complex calculation and insufficient precision in the existing inversion method

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  • Insulator surface charge inversion method based on digital image processing technology
  • Insulator surface charge inversion method based on digital image processing technology
  • Insulator surface charge inversion method based on digital image processing technology

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Embodiment Construction

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0053] In this embodiment, a flat insulator with a surface size of 45mm×45mm is taken as an example to specifically illustrate the implementation of the method of the present invention. Here, the insulator model is established in the computer with a geometric size of 1:1, and the surface charge of the letter "WHU" is artificially set on its surface. The charge density of these three letters is set to 1C / m respectively. 2 , 0.5C / m 2 , 1C / m 2 ,Such as figure ...

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Abstract

The invention provides an insulator surface charge inversion method based on a digital image processing technology, which comprises the steps of: dividing the surface of an insulator into a pluralityof grids; setting a unit analog charge at the geometric center of the surface, and calculating surface potential distribution formed by the analog charge; performing two-dimensional discrete Fourier transformation on the unit analog charge distribution to obtain a unit analog charge distribution matrix in a frequency domain, performing two-dimensional discrete Fourier transformation on the surfacepotential distribution to obtain a surface potential distribution matrix in a frequency domain, calculating a conversion matrix through the unit analog charge distribution in the frequency domain andthe surface potential distribution in the frequency domain, constructing a constrained least square filter, and obtaining an optimal solution of a filter coefficient by using an iterative algorithm;and obtaining an optimized constrained least square filter, calculating an estimated solution of the surface charge density in a frequency domain, and obtaining surface charge density distribution ina space domain through two-dimensional inverse Fourier transformation. The method is small in calculation amount and high in precision, and is helpful for promoting the research process of insulator surface charge distribution characteristics.

Description

technical field [0001] The invention belongs to the technical field of detection of power transmission and distribution insulation components, and in particular relates to an inversion method for surface charges of insulators based on digital image processing technology. [0002] technical background [0003] In DC gas-insulated equipment, the charge accumulation at the gas-solid insulation interface caused by the long-term unipolar DC electric field will reduce the surface flashover voltage of the internal insulator, which severely limits the large-scale industrial application of DC gas-insulated equipment. Therefore, it is necessary to carry out relevant research on the surface charge distribution characteristics of insulators to provide strong technical support for the scientific design and safe operation of DC gas-insulated equipment. [0004] At present, the surface charge measurement method of insulators mainly adopts the electrostatic probe method, which divides the in...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00G01R29/24
CPCG06T7/0004G01R29/24G06T2207/20056G06T2207/30164G06T5/70
Inventor 潘成潘子君唐炬罗毅周思远
Owner WUHAN UNIV
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