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Low-value insulator detection method based on infrared thermography

A technology of insulator detection and infrared thermal imaging, which is applied in the detection of insulator operating status and online detection of deteriorated porcelain insulators based on infrared thermal imaging, to achieve the effects of ensuring safe operation, reducing labor intensity and improving detection efficiency

Inactive Publication Date: 2015-01-07
STATE GRID CORP OF CHINA +3
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Problems solved by technology

Among them, the voltage distribution detection method, the electric field measurement method, and the sensitive insulator method require inspectors to go to the tower to measure a large amount of data, which is labor-intensive and easily affected by the professional level of the inspectors. Background noise interference, and the above detection methods are mainly to detect zero-value insulators, and cannot effectively detect deteriorated low-value insulators

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  • Low-value insulator detection method based on infrared thermography
  • Low-value insulator detection method based on infrared thermography
  • Low-value insulator detection method based on infrared thermography

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specific Embodiment approach

[0028] The implementation of the present invention requires a high-precision infrared camera with a temperature resolution of less than 0.04°C.

[0029] In conjunction with accompanying drawing, the concrete steps that the present invention is implemented are introduced as follows:

[0030] (1) Obtain the infrared thermal image of the insulator string to be tested with the help of a high-precision infrared camera.

[0031] (2) After filtering, noise reduction and binary morphological image processing on the above image, the image area of ​​the steel cap of the insulator in the porcelain insulator string is obtained.

[0032] (3) After curve fitting using the gray value of the above image area, the gray value characteristic curve of the steel cap of the insulator string is obtained, as shown in the attached figure 2 shown.

[0033] (4) Under the premise of considering the allowable fluctuation range of ±5%, detect whether the characteristic gray curve of the steel cap contai...

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Abstract

The invention discloses a low-value insulator detection method based on infrared thermography. The method comprises the following steps: acquiring an infrared thermogram of a to-be-detected porcelain insulator string; after image processing, extracting a grayscale image area of a steel cap part of each insulator sheet to form a grayscale characteristic curve. The quick detection of low-value defects of insulators and the quick positioning of the defective insulators can be realized by detecting whether the grayscale curve of steel caps contains rising distortion points. The low-value degraded insulator detection method provided by the invention is simple in implementation and easy to operate, the defects that current common detection methods are high in labor intensity, strong in subjectivity and likely to influence by the skills of an operator are overcome, and an objective and convenient technical scheme is provided for the state detection of low-value degraded insulators.

Description

[0001] technical field [0002] The invention belongs to the field of maintenance of the running state of electric equipment, and relates to the detection of the running state of insulators, in particular to an online detection method for deteriorated porcelain insulators based on infrared thermal images. Background technique [0003] Line insulators are an important part of the AC transmission system. At present, the insulators used in the AC transmission system are still mainly porcelain insulators. Under the action of long-term electric field and mechanical force, porcelain insulators are likely to cause the insulation performance to decline and become low-value insulators, and then further deteriorate or even lose insulation performance to become zero-value insulators. Low-value insulators and zero-value insulators are all degraded insulators. The appearance of low-value insulators will cause the distribution voltage on other insulators in the same string to increase,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/72
Inventor 朱向前李唐兵姚建刚况燕军
Owner STATE GRID CORP OF CHINA
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