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GIS equipment mechanical fault detection system and method based on acoustic imaging

A technology of mechanical faults and detection methods, which is applied in the testing of mechanical components, radio wave measurement systems, and testing of machine/structural components. The results are not intuitive and other problems, to avoid the mixing of false sound sources, improve the anti-interference ability, and reduce the effect of variance

Active Publication Date: 2021-08-17
STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]The traditional contact vibration detection method is to measure the vibration signal by placing the vibration sensor on the shell of the GIS equipment, and detect the GIS equipment according to the strength of the vibration signal Fault points, this method has high requirements for the selection of measuring points. If the measuring points are not selected properly, it is difficult to fully and accurately reflect the mechanical status of GIS equipment because the local acoustic characteristics are not sensitive to faults. , due to the complex composition of the existing vibration detection system, cumbersome operation, limited detection range, and unintuitive detection results, the field application effect is poor

Method used

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  • GIS equipment mechanical fault detection system and method based on acoustic imaging
  • GIS equipment mechanical fault detection system and method based on acoustic imaging
  • GIS equipment mechanical fault detection system and method based on acoustic imaging

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Embodiment 1

[0055] Embodiment 1 of the present invention provides a GIS equipment mechanical failure detection system based on acoustic imaging, such as figure 1 As shown, the detection system shown includes an acoustic signal acquisition module, an acoustic signal processing module, a sound field imaging module, a video acquisition module, a superimposed positioning output module, and a human-computer interaction terminal. The acoustic signal acquisition module is connected to the acoustic signal processing module. The sound field imaging module is respectively connected with the sound signal processing module, the video acquisition module and the human-computer interaction terminal;

[0056] In this embodiment, the detection system data processing adopts the FPGA storage control unit as the core processing unit, and executes the stored program algorithm through multi-task management;

[0057] The acoustic signal acquisition module includes a microphone array and an analog-to-digital con...

Embodiment 2

[0068] Embodiment 2 of the present invention provides a GIS equipment mechanical failure detection method based on acoustic imaging, based on the detection system in Embodiment 1 above, such as image 3 As shown, the specific steps of the detection method are as follows:

[0069] Acquisition and processing of sound signals, collecting sound field signals of the equipment to be tested, obtaining sound signals of multiple channels, and denoising and amplifying the collected sound signals;

[0070] combine Figure 4 and Figure 5 As shown, the obtained multi-channel sound signal X(n) is windowed and framed, and the i-th frame speech signal xi(m) with a frame length of N is obtained, and the obtained speech signal is subjected to fast Fourier transform. The transformed output signal is denoted as xi(k), and the noise estimation algorithm is used to calculate xi(k) to output the signal D(k). )| 2 , will |xi(k)| 2 and D(k) are used as input for spectral subtraction, and the obt...

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Abstract

The invention provides a GIS equipment mechanical fault detection system and method based on acoustic imaging, and the system comprises an acoustic signal collection module, an acoustic signal processing module, a sound field imaging module, a video collection module, a superposition positioning output module, and a man-machine interaction terminal. The sound signal acquisition module comprises a microphone array with a non-uniform spiral arrangement structure and an analog-to-digital conversion module, and is used for acquiring multichannel sound signals. According to the detection method, collected sound signals are processed through spectral subtraction, sound field models including a measuring point plane measuring point model and a sound source focus point model are constructed based on an array, then an intermediate structure is obtained through calculation of a beam forming algorithm, iterative calculation is carried out in combination with a deconvolution DAMAS algorithm, a sound field cloud distribution diagram is output, the image data synchronously acquired with the sound signal are overlapped and fused, and a sound field effect picture is output.

Description

technical field [0001] The invention relates to the technical field of mechanical fault detection of acoustic imaging, in particular to a GIS equipment mechanical fault detection system and method based on acoustic imaging. Background technique [0002] Gas insulated metal-enclosed switchgear (Gas Insulated Switchgear, GIS) is widely used in important loads and hub substations due to its advantages of compact structure, high reliability, strong safety, and convenient operation and maintenance. It is a widely used electrical equipment, and its stable and reliable operation is directly related to the safety of the power system. [0003] GIS equipment in operation always has an inherent vibration frequency. When the equipment has mechanical defects such as loose fasteners, poor contact of switch contacts, and unbalanced butt joints of the shell, the alternating electric force, electromagnetic force, and switch operation mechanical force Under the action of other factors, mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00G01S5/18
CPCG01M13/00G01S5/18Y04S10/52
Inventor 蒋西平李永福龙英凯王谦李龙
Owner STATE GRID CHONGQING ELECTRIC POWER CO ELECTRIC POWER RES INST
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