Power cable partial discharge signal denoising method based on wavelet analysis

A discharge signal and power cable technology, applied in the direction of testing the dielectric strength, etc., can solve the problems of mixed noise, difficult measurement, insufficient global characteristics of the signal, etc.

Inactive Publication Date: 2012-07-18
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

Long-term practice has proved that partial discharge is the main cause of damage to power cables. Therefore, detection and diagnosis of partial discharge is a major measure to protect power cables. However, noise and interference are often mixed in the detection process of partial discharge signals of power cables. , making it very difficult to measure
[0003] At present, the Fourier analysis method is mainly used to deal with the partial discharge signal noise of power cables,

Method used

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  • Power cable partial discharge signal denoising method based on wavelet analysis
  • Power cable partial discharge signal denoising method based on wavelet analysis
  • Power cable partial discharge signal denoising method based on wavelet analysis

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Embodiment Construction

[0066] A kind of power cable partial discharge signal denoising method example based on wavelet analysis of the present invention comprises the following steps:

[0067] 1) Apply the MDL criterion to select the optimal wavelet base, and according to the formula (1), adaptively select the optimal wavelet base of the partial discharge signal: for a certain partial discharge signal x(n), separate it from the wavelet function in the wavelet base library Do a wavelet transform, coefficients A1, D1, A2, D2, A3, D3...An, Dn, use the formula (1) to calculate the MDL values ​​k1, k2 of the respective low-frequency wavelet coefficients A1, A2, A3...An , k3…..kn, select the wavelet base corresponding to the minimum MDL value as the optimal wavelet base, the flow chart is as follows figure 2 shown;

[0068] MDL ( k , m ) = min 0 ≤ ...

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Abstract

The invention provides a partial discharge signal denoising method based on wavelet analysis, which belongs the technical field of signal processing, and is mainly applied to power cable partial discharge signal denoising. The method for performing intelligent denoising processing on power cable partial discharge signals specifically includes: selecting optimal wavelet basis by using minimum description length (MDL) standard of the information theory, selecting a denoising method, performing wavelet decomposition according to a certain decomposition level, processing wavelet coefficients according to different threshold functions, performing wavelet reconstruction according to the processed wavelet coefficients, and achieving the denoising. The partial discharge signal denoising method solves the problem of manual screening of conventional partial discharge signal denoising, thereby achieving the purpose of the intelligent denoising of the partial discharge signals.

Description

technical field [0001] The invention relates to a method for denoising power cable partial discharge signals, in particular to a method for applying wavelet theory to power cable partial discharge signal denoising. Background technique [0002] Power cables are one of the most important assets of a utility company. With the continuous improvement of power supply reliability requirements, the current accident-based maintenance of power infrastructure is far from meeting the requirements, and the condition-based maintenance, namely "condition-based maintenance" has been paid more and more attention. "Condition maintenance" is to grasp the operation status of the equipment in advance, eliminate hidden dangers of equipment in time, and avoid accidents. Some domestic power companies attach great importance to the condition monitoring and condition maintenance of power equipment, and have successively introduced various advanced detection technologies and equipment. Good results ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 姚森敬田立斌陈伟璇周玲
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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