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Corrosion detection device and method based on sh0 wave power system grounding grid conductor

A technology for power system and corrosion detection, applied in measurement devices, radio wave measurement systems, re-radiation of sound waves, etc., can solve problems such as corrosion of grounding grid conductors, and achieve the effects of long detection distance, convenient detection and high signal-to-noise ratio.

Active Publication Date: 2011-12-21
BEIJING UNIV OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of fast, comprehensive and in-service non-destructive detection of grounding grid conductor corrosion

Method used

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  • Corrosion detection device and method based on sh0 wave power system grounding grid conductor
  • Corrosion detection device and method based on sh0 wave power system grounding grid conductor
  • Corrosion detection device and method based on sh0 wave power system grounding grid conductor

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Embodiment 1

[0037] Embodiment 1 is provided in combination with the content of the method of the present invention. The characteristic is that the object is a grounding grid conductor. A method for non-destructive testing of grounding grid conductors using SH0 wave electromagnetic ultrasound is provided:

[0038] Example 1:

[0039] (1) if figure 1 As shown, the SH0 wave electromagnetic acoustic excitation transducer 3 and the SH0 wave electromagnetic acoustic receiving transducer 4 are placed on the central axis in the length direction of the grounding grid conductor 8 . The SH0 wave electromagnetic acoustic excitation transducer 3 is connected to the excitation end impedance matching instrument 2, the excitation end impedance matching instrument 2 is connected to the pulse function generator 1, and the SH0 wave electromagnetic acoustic receiving transducer 4 is connected to the receiving end impedance matching instrument 5 The receiving end impedance matching instrument 5 is connected...

Embodiment 2

[0054] Embodiment 2 is provided in conjunction with the content of the method of the present invention, and the object of action is a wide aluminum plate with a thickness of 1 mm. Also using Example 1 figure 1 device, the ground grid conductor 8 becomes a wide aluminum plate 13:

[0055] (1) The SH0 wave electromagnetic acoustic excitation transducer 3 and the SH0 wave electromagnetic acoustic receiving transducer 4 are placed on the central axis in the length direction of the wide aluminum plate 13 . Place the SHO wave EMAT excitation sensor 3 at the far left of the board (half of the sensor rests on the wide aluminum plate 13). The SH0 wave electromagnetic acoustic receiving transducer 4 is placed at a distance of 0.5m from the excitation sensor. The aluminum plate 13 in this embodiment has a total length of 1m, a cross-section of 1mm×20cm rectangle, and a density of 2.7g / cm 3 , Poisson's ratio is 0.33. Figure 12 The group velocity curves of the modes in a 1mm thick fre...

Embodiment 3

[0068] The object of action is a narrow aluminum strip with a thickness of 1mm and a width of 7cm.

[0069] (1) Use the same device figure 1 , the object becomes a narrow aluminum strip 14 with a width of L=7cm. Place the SH0 wave electromagnetic acoustic excitation transducer 3 on a narrow aluminum strip 14 with a width of L=7cm. The SH0 wave electromagnetic acoustic excitation transducer 3 is located at a distance of 35 cm from the left end of the aluminum bar, and the distance between the SH0 wave electromagnetic acoustic excitation transducer 3 and the SH0 wave electromagnetic acoustic receiving transducer 4 is kept at 25 cm. The width is L=7cm narrow aluminum bar 14 receiving waveforms such as Figure 16 , less clutter, clear and simple echo, no mode conversion, high signal-to-noise ratio. The waveform after denoising by one-dimensional wavelet packet analysis method is as follows: Figure 17 . Comprehensive Example 2 Figure 14 and in Example 3 Figure 16 , Figu...

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Abstract

The invention discloses a device and a method for detecting the corrosion of a conductor of a grounding grid of a power system based on an SH0 (horizontal shear) wave, which belong to the technical field of nondestructive detection. A pulse function generating instrument passes through an impedance matching instrument at an exciting end, and then is connected with an SH0 wave electromagnetic acoustic excitation energy converter, so as to excite the SH0 wave without frequency dispersion and with single modality, good directionality and large energy; an SH0 wave electromagnetic acoustic excitation energy converter 3 and an SH0 wave electromagnetic acoustic receiving energy converter 4 are placed on a central axis in the length direction of the conductor of the grounding grid; an excitation frequency is a maximum frequency of the working energy of a sensor; and the nondestructive detection is carried out on the corrosion of the conductor of the grounding grid by utilizing the SH0 wave generated under a central frequency. By using the device and the method, the defects that the detection of the corrosion of the conductor of the grounding grid is incomplete, the implementation of detecting a metal constructional element by utilizing a Lamb wave is inconvenient, and the Lamb wave has multimodality, frequency dispersion and an obvious boundary effect, and easily generates modality conversion are overcome, and the nondestructive detection method can serve the nondestructive detection remotely, quickly and completely, and is further popularized to the nondestructive detection of the corrosion of narrow strip metal structures.

Description

technical field [0001] The invention belongs to the field of ultrasonic guided wave non-destructive testing, in particular to a method for detecting corrosion of grounding grid conductors in power systems by using SHO (horizontal shear) waves. Background technique [0002] The grounding of the substation is the connection between the electrical equipment and the earth, so that the electrical equipment can be kept at the same potential, which is an important measure to ensure the safe and reliable operation of the power system. The general practice is to lay a ground grid. The grounding grid conductor is prone to corrosion after long-term operation, causing the power equipment to stop working, and even causing the power system to be paralyzed. Therefore, the study of grounding grid corrosion has important social and economic benefits. [0003] The common cross-section of the grounding grid conductor is rectangular 6mm×60mm with slightly pure edge galvanized flat steel or Φ2...

Claims

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Application Information

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IPC IPC(8): G01N17/00G01S15/08
Inventor 焦敬品钟茜何存富王炯耿罗宏建周重回林群郑昌庭骆炫忠
Owner BEIJING UNIV OF TECH
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