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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, detection of pillar porcelain insulator defects, etc., so as to reduce inventory and equipment. The effect of safe operation and improved maintenance level

Inactive Publication Date: 2015-07-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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Embodiment 1

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

[0055] (1) According to the size of the measured component, 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 measure axially along the surface of ...

Embodiment 2

[0060] The invention discloses a method for detecting crack defects of porcelain insulators in service. The method fixes a voltage equalizing ring close to the surface of the insulating post at one end of the measurement area, and equipotentializes a horizontal circle around the insulating post as a reference potential. This method uses the principle of electric field method to detect surface crack defects of high-voltage pillar porcelain insulators. In this case, the 110kV pillar porcelain insulators supporting high-voltage busbars in substations are tested, mainly the surface of the porcelain pillars between the lower flange and the first shed. detection. Detection step is as shown in embodiment 1, draws electric field distribution curve at last as Figure 10 as shown, Figure 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 of 20mm from the lower flange...

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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] The invention discloses a method for detecting crack defects of pillar porcelain insulators in service, which belongs to the technical field of on-line monitoring and condition-based maintenance of electric equipment. Background technique [0002] Porcelain insulators for outdoor pillars of substations are insulating pillars supporting high-voltage busbars and live parts of high-voltage electrical appliances. Porcelain pillar insulators are widely used in power transmission and transformation devices in power systems. Porcelain pillar insulators are ceramic products sintered at high temperature. They are brittle materials with extremely low toughness. Therefore, there are often quality problems in product manufacturing, such as looseness of internal ceramic materials, internal and surface cracks, etc., and pillar porcelain insulators in substations It is exposed to the air all year round, bears a large load, and the working environment is very harsh. ...

Claims

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Application Information

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Patent Type & Authority Patents(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)