On-line detection method and system for internal defects of composite insulator of line

A technology of composite insulators and internal defects, applied in the direction of material defect testing, etc., can solve the problem that the pulse infrared thermal wave technology is difficult to apply to the online detection of line power equipment, and achieve the effect of solving the large curvature and sheath thickness and accurate analysis

Inactive Publication Date: 2020-02-18
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides an online detection method for internal defects of line composite insulators to solve the problem that the existing pulse infrared thermal wave technology is also difficult to apply to the online detection of line power equipment

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  • On-line detection method and system for internal defects of composite insulator of line
  • On-line detection method and system for internal defects of composite insulator of line
  • On-line detection method and system for internal defects of composite insulator of line

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[0039] In order to enable those skilled in the art to better understand the technical solutions in the application, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application; obviously, the described implementation Examples are only some of the embodiments of the present application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0040] Line composite insulators are affected by the production process and operating environment, and their insulation and mechanical properties will decline to a certain extent during operation. The safe operation of the line poses a serious threat. Compared with station insulation equipment, the online detection of line insulators is more difficult t...

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Abstract

The application provides an on-line detection method and system for internal defects of a composite insulator of a line. An air gap defect existing in a composite insulator of a line is detected by determining a maximum temperature difference in a to-be-detected area of the composite insulator by using a collected infrared thermogram as a reference object based on portable external constant-current heat source excitation. According to the invention, the line composite insulator is heated by a constant-current heat source based on the heat flow propagation principle, infrared thermogram acquisition and surface temperature analysis; the propagation of the heat flow in the defect area and the defect-free area of the insulator is different and the temperature field distribution difference canbe reflected on the surface of the insulator; a thermal image sequence and the temperature distribution are collected by a thermal infrared imager so as to analyze the defect rapidly and accurately, so that a problem of difficulty in identifying deep defects and the like due to the relatively large curvature of the line composite insulator and relatively large thickness of a sheath are solved.

Description

technical field [0001] The present application relates to the technical field of non-destructive testing of power equipment, and in particular to an on-line testing method and system for internal defects of line composite insulators. Background technique [0002] Line insulators are devices installed between conductors at different potentials or between conductors and grounding components that can withstand voltage and mechanical stress. They are composed of two parts: insulating parts and connecting fittings. Compared with traditional ceramic insulators, composite insulators have excellent pollution flashover resistance, convenient transportation and easy maintenance, making composite insulators widely used in ultra-high voltage transmission lines in my country since the 1980s. Accidents caused by composite insulator fractures will not only cause long-term power outages, but also pose a serious threat to the lives and property of residents under the line. [0003] Existing...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/72
CPCG01N25/72
Inventor 郭晨鋆张思达龚泽威一成立廖瑞金段雨廷马显龙曹占国李昊
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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