Method for detecting crack defect of in-service strut porcelain insulator

A pillar porcelain insulator and defect technology, which is used in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of high instrument cost, observation angle problems, and detection of pillar porcelain insulator defects, etc., to achieve equipment operation safety, reduce Inventory and the effect of improving maintenance levels

Inactive Publication Date: 2013-10-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

The disadvantages of this method are: the high cost of the instrument; the problem of the observation angle (especially in the substation); the test process is easily affected by factors such as ambient temperature, sunlight, atmosphere, and moisture.
The disadvantages of this method are: the high cost of the instrument, the problem of the observation angle (especially in the substation), the test process is easily affected by environmental factors, and cannot reflect internal defects well
[0009] Therefore, although the existing detection methods have certain advantages, they also have many shortcomings, which are not enough to complete the task of detecting the defects of pillar porcelain insulators with high resolution and high sensitivity.

Method used

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  • Method for detecting crack defect of in-service strut porcelain insulator
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  • Method for detecting crack defect of in-service strut porcelain insulator

Examples

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Embodiment 1

[0054] A method for detecting crack defects of porcelain insulators in service pillars. A pressure equalizing ring is fixed at one end of the measurement area close to the surface of the insulating pillar, and a horizontal circle surrounding the insulating pillar is equipotential and used as a reference potential. This method uses the principle of electric field method to detect the surface crack defects of high-voltage pillar porcelain insulators. In this case, the 110kV pillar porcelain insulators supporting the high-voltage busbar in the substation are tested, mainly on the surface of the porcelain pillar between the lower flange and the first umbrella skirt. Detection. The method steps are as follows:

[0055] (1) According to the size of the component under test, the number of measurement points of the 110kV pillar porcelain insulator, that is, the number of probes is 16; the resistance divider rod device is selected for potential measurement.

[0056] (2) 16 probes are measu...

Embodiment 2

[0060] A method for detecting crack defects of porcelain insulators of in-service pillars. This method fixes a pressure equalizing ring at one end of the measurement area close to the surface of the insulating pillar, and equipotentializes a horizontal circle around the insulating pillar as a reference potential. This method uses the principle of electric field method to detect the surface crack defects of high-voltage pillar porcelain insulators. In this case, the 110kV pillar porcelain insulators supporting the high-voltage busbar in the substation are tested, mainly on the surface of the porcelain pillar between the lower flange and the first umbrella skirt. Detection. The detection steps are as shown in Example 1, and finally the electric field distribution curve is drawn as Picture 10 As shown, Picture 10 It is a schematic diagram of the data of Example 2, which is also represented by two curves. It is judged that the distortion rate of the electric field at a distance...

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Abstract

The invention discloses a method for detecting a crack defect of an in-service strut porcelain insulator, belonging to the technical field of online monitoring and condition-based maintenance of electrical equipment. The method comprises the following steps of: determining the quantity of to-be-measured points and selecting a measuring device according to the size of a tested element; measuring a potential value aiming at a frequently-broken part of the strut porcelain insulator; according to the potential value, calculating an axial component of an electric field intensity, drawing a curve diagram; according to the electric field curve diagram, locating a defect, analyzing the deterioration degree and obtaining a conclusion. According to the method, maintenance is carried out purposefully, the maintenance level can be improved so that equipment runs more safely and reliably; and the inventory level of replacement parts, and the cost required by replacing parts and maintaining the parts is reduced. The method is used as a new supplement of the online detection method for the strut porcelain insulator, thus the method of condition-based maintenance is perfected. The method has the advantages of high resolution, high sensitivity and the like for detecting cracks on the surface of the strut porcelain insulator, and can be widely applied to the detection of the strut porcelain insulator in high-voltage alternating-current and direct-current transmission and transformation projects.

Description

Technical field [0001] A method for detecting crack defects of in-service pillar porcelain insulators belongs to the technical field of on-line monitoring and condition maintenance of electrical equipment. Background technique [0002] Outdoor pillar porcelain insulators in substations are insulating pillars that support high-voltage busbars and live parts of high-voltage electrical appliances. It mechanically connects and electrically insulates the live body and the grounding body. It is an important component of the operation of the substation. Porcelain insulators are widely used in power transmission and transformation devices. Pillar porcelain insulators are ceramic products sintered at high temperature. They are brittle materials with very low toughness. Therefore, there are often product manufacturing quality problems, such as loose internal ceramic materials, internal and surface cracks, etc., and then pillar porcelain insulators in substations It is exposed to the air a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/61
Inventor 郑重冯伟黄智伟陈校芸刘建寅于洪余洋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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