Mechanical state detection method of vacuum circuit breaker based on vibration signal analysis

A technology of vacuum circuit breaker and vibration signal, which is used in the testing of mechanical parts, the testing of machine/structural parts, instruments, etc., and can solve problems such as non-periodicity

Active Publication Date: 2015-07-29
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The vibration signal of the high-voltage switch is an instantaneous non-stationary signal and has no periodicity

Method used

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  • Mechanical state detection method of vacuum circuit breaker based on vibration signal analysis
  • Mechanical state detection method of vacuum circuit breaker based on vibration signal analysis
  • Mechanical state detection method of vacuum circuit breaker based on vibration signal analysis

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Embodiment Construction

[0055] see figure 1 with figure 2 As shown, the vacuum circuit breaker mechanical state detection method based on vibration signal analysis of the present invention includes the following steps:

[0056] 1) Collect the vibration signal during the action of the VS1 vacuum circuit breaker;

[0057] 2) Denoise the vibration signal collected in step 1) through wavelet decomposition: use the one-dimensional signal wavelet denoising function wden() of matlab to realize it, and the parameters are set as: wavelet base selects bior3.9 wavelet base or bior3.7 Wavelet base, the number of decomposition layers is 3, the threshold quantization of wavelet coefficients is performed with the heursure heuristic threshold, and the denoising is completed using the soft threshold function;

[0058] 3) For the signal after wavelet decomposition, reconstruct the signal in each frequency band, draw the reconstructed signal in each frequency band in the time-frequency-signal amplitude spectrum of t...

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Abstract

The invention discloses a vacuum breaker mechanical state detecting method based on vibration signal analysis. The method comprises the following steps: 1), acquiring the vibration signal in the action process of a VS1 vacuum breaker; 2), performing wavelet decomposition to the vibration signal acquired in the step 1) in order to de-noise; 3), for the signal subjected to the wavelet decomposition, reconstructing the signal in each frequency band, drawing the reconstructed signal of each frequency band in a time-frequency-signal amplitude spectrum of the signal by mat lab, and calculating the information entropy of each frequency domain band and combining the information entropy of each frequency band of the vibration signal with each other to form a fault feature vector; and 4), inputting the fault feature vector calculated in the step 3) into a well trained neutral network and sort, so as to realize the state detection of the vacuum breaker.

Description

technical field [0001] The invention relates to the technical field of vacuum circuit breakers, in particular to a method for detecting the mechanical state of a VS1 vacuum circuit breaker based on vibration signal analysis. Background technique [0002] VS1 vacuum circuit breaker is a kind of high-voltage switch, and the operating status of the high-voltage switch in the power grid is extremely important to the safe operation of the system. Status inspection is based on the actual operating conditions of the equipment to determine whether the equipment needs to be overhauled, which parts and contents to overhaul, and has a strong pertinence. Among the high-voltage switch accidents, the faults caused by mechanical reasons occupy the first place. Therefore, in order to realize the state detection of VS1 vacuum circuit breaker, its mechanical state must be considered, and the vibration signal during the closing and opening process contains a large amount of equipment mechanica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01H17/00
Inventor 牛博王森吕亮李志忠卢鹏宋政湘
Owner STATE GRID CORP OF CHINA
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