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Online detection method and device for low-voltage current mutual inductor

A low-voltage current and detection method technology, which is applied in the direction of instruments, optical testing flaws/defects, image data processing, etc., can solve problems such as inability to effectively distinguish cracks and scratches, and increase in misjudgment rate, so as to avoid detection risks and ease supply The effect of tension, speeding up production

Inactive Publication Date: 2015-04-22
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

In recent years, many scholars at home and abroad have applied image processing technology to the detection of surface cracks and achieved good results. However, due to the characteristics of the surface material of low-voltage current transformers, when there are scratches, the existing detection methods cannot be effective. Distinguish between cracks and scratches, so the misjudgment rate greatly increased by the influence of scratches

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  • Online detection method and device for low-voltage current mutual inductor
  • Online detection method and device for low-voltage current mutual inductor
  • Online detection method and device for low-voltage current mutual inductor

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Embodiment Construction

[0035] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the accompanying drawings.

[0036] as attached figure 2 As shown, a low-voltage current transformer online detection method includes the following steps:

[0037] Step 1, acquire the surface image of the low-voltage current transformer, and perform image acquisition on each surface of the low-voltage current transformer to be detected.

[0038] Step 2, Gaussian denoising and smoothing are performed on the image. Usually, the acquired image data is transmitted to the computer, and the cvSmooth() function in opencv is used to perform Gaussian denoising on the low-voltage current transformer image received by the computer, and smooth the image to obtain a better image for subsequent processing. The analysis of the crack characteristics shows that the edge has very obvious features, and the edge information is very important whe...

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Abstract

The invention discloses an online detection method and device for a low-voltage current mutual inductor. The method comprises the following steps: acquiring a surface image of the low-voltage current mutual inductor; carrying out Gaussian denoising and smoothening on the image; carrying out image segmentation to separate a to-be-detected target from the background, and carrying out binaryzation on the image; carrying out framework extraction to extract a framework of the binarized image in a target region; analyzing the image of the framework, marking current mutual inductors accordant with the crack character, extracting the framework of the binarized target region by virtue of medial axis transformation when the framework is extracted so as to enable the framework which is subjected to the medial axis transformation to be formed by single pixel points. The device can be applied to online detection on the production line, so that the production efficiency is effectively improved, and the labor cost is lowered.

Description

technical field [0001] The invention relates to the fields of digital image processing technology and industrial detection technology, in particular to an online detection method and device for a low-voltage current transformer. Background technique [0002] With the development of society, more and more attention has been paid to product quality issues. The most representative one is the surface defect of the workpiece, and cracks are the most common one. This defect directly affects product quality and poses a safety hazard. The National Energy Administration released the electricity consumption data of the whole society, indicating that electric energy is applied to various fields of social life, and the current and low-voltage current transformers, as a commonly used current conversion device, have been used in current detection, electric energy measurement and relay protection. widely used. Cracks on the surface of low-voltage current transformers may cause breakdown...

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Application Information

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IPC IPC(8): G01N21/95G06T7/00
Inventor 宋强林国营肖勇张鼎衢潘峰
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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