Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS)

A gas-insulated combination and basin-type insulator technology, which is applied in the fields of instruments, measuring electricity, measuring devices, etc., can solve the problems of component damage, acquisition of discharge signals, and low image contrast, and achieves improved stability, high detection accuracy, and false disconnection. rate reduction effect

Active Publication Date: 2016-06-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GIS pot insulators often have internal defects. On the one hand, such defects are air gap defects that may occur during production and processing, and on the other hand, they are caused by GIS equipment transportation, component damage and deformation during installation, and during operation. Cracks caused by concentrated mechanical vibration
After the GIS pot insulator is put into operation, defects often occur. Due to the temperature difference in the working environment of the insulator, it can be known from the principles of thermal expansion that the insulator may bear huge internal stress, and there is a risk of deformation, which will eventually lead to the deformation of the pot insulator.
Defects such as air bubbles, cracks, and internal impurities are common insulation defects in GIS. According to the manufacturing and installation process of insulators, air bubble defects are generally produced due to the existence of shrinkage stress during the pouring and curing of insulators; When the insulator is installed and fixed, due to the uneven force of the fastening bolts, stress will be generated on the insulator, and it is easy to crack under the influence of vibration during the subsequent operation; in addition, due to the influence of the working environment during the operation of the GIS, large tempera

Method used

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  • Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS)
  • Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS)
  • Internal defect detection system and method for basin-type insulator of gas insulated switchgear (GIS)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown, a detection system for the internal defects of the basin insulator of gas-insulated combined electrical appliances, including a miniature antenna arranged in the basin-type insulator of gas-insulated combined electrical appliances, a signal protection circuit, parameter detection equipment and a detection and analysis module installed a computer; one end of the parameter detection equipment is connected to the micro-antenna through the signal protection circuit, and the other end is connected to a computer equipped with a detection and analysis module.

[0030] The parameter detection device is a vector network analyzer.

[0031] Such as figure 2 As shown, the micro-antenna is set inside the single-phase single-box pot insulator, and the micro-antenna is a logarithmic curved surface helical antenna, such as image 3 shown.

[0032] Such as Figure 4 As shown, the signal protection circuit includes a signal isolation circuit 4N25, a transi...

Embodiment 2

[0051] The difference between this embodiment and Embodiment 1 is that the micro-antenna is arranged inside the three-phase common box-type pot insulator, and the micro-antenna is composed of three curved surface loop antennas, as Figure 5 shown.

Embodiment 3

[0053] A detection method for the internal defect detection system of the basin-type insulator of the gas-insulated combined electrical appliance, comprising the following specific steps:

[0054] Step 1: Calculation of impedance correlation coefficient: the impedance correlation coefficient r xy The calculation method is:

[0055] r x y = Σ i = 1 n ( x i - x ‾ ) ( y i - y ‾ ...

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Abstract

The invention discloses an internal defect detection system and method for a basin-type insulator of a GIS. The detection system comprises a mini antenna arranged in the basin-type insulator of the GIS, a signal protection circuit, a parameter detector and a computer provided with a detection analysis module, one end of the parameter detector is connected with the mini antenna via the signal protection circuit, and the other end of the parameter detector is connected with the computer. The detection method comprises the steps of calculation of the impedance related coefficients and detection. According to the method of the invention, characteristic parameters of the antenna are detected to detect an internal defect of the basin-type insulator of the GIS, the method is higher in detection precision and sensitivity, and slight deformation of the basin-type insulator can be detected.

Description

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Claims

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Application Information

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Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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