On-load tap-changer fault identification method based on vibration signal characteristic extraction

A vibration signal and on-load tapping technology, which is applied in the field of power equipment and mechanical vibration signal processing of power equipment, can solve the problems of feature extraction effect influence, low algorithm efficiency, modal aliasing, etc., so as to facilitate state monitoring and fault diagnosis , the effect of improving the effect

Active Publication Date: 2019-04-16
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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Problems solved by technology

However, since the EMD method takes the envelope of the vibration signal, the extreme points of the signal are unevenly distributed, which will lead to the occurrence of mode aliasing, so that the physical meaning of the decomposed eigenmode components is not clear. The effect of extracting the effect
At the same time, t...

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  • On-load tap-changer fault identification method based on vibration signal characteristic extraction
  • On-load tap-changer fault identification method based on vibration signal characteristic extraction
  • On-load tap-changer fault identification method based on vibration signal characteristic extraction

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[0047] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0048] The on-load tap changer fault identification method based on the vibration signal feature extraction proposed by the present invention uses a simulated annealing algorithm to select parameters, and adaptively selects the mode number K and the secondary penalty factor α according to the vibration signal to obtain The optimal combination of parameters can improve the effect of vibration signal modal decomposition and help to extract more significant features for subsequent condition monitoring and fault diagnosis. The present invention is for achieving above-mentioned purpose of the invention, and the concrete technical scheme that adopts is as follows:

[0049] Step 1: Collect the vibrat...

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Abstract

An on-load tap-changer fault identification method based on vibration signal characteristic extraction is disclosed. The method is characterized by using a simulated annealing algorithm to carry out parameter selection; and adaptively selecting a modal number K and a second penalty factor alpha according to a vibration signal to obtain an optimal parameter combination. The effect of vibration signal modal decomposition is improved, which is good for extracting more significant characteristics and is convenient for subsequent state monitoring and fault diagnosis.

Description

technical field [0001] The invention belongs to the technical field of power equipment, relates to the field of mechanical vibration signal processing of power equipment, and in particular relates to a signal processing method for mechanical vibration signals of an on-load tap changer of a power transformer. Background technique [0002] The on-load tap-changer is the only moving key component in a power transformer. The feature recognition and fault diagnosis of the mechanical vibration signal of the on-load tap-changer can judge the operating status of the switch in time, which is conducive to ensuring the safety of the equipment and the reliable operation of the power grid. [0003] Since the mechanical vibration signal of the on-load tap-changer is nonlinear and non-stationary, the time domain or frequency characteristics extracted by wavelet transform or fast Fourier transform are not a stable and effective index, and cannot accurately reflect the vibration signal. int...

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Application Information

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IPC IPC(8): G01R31/327G01M13/00
CPCG01M13/00G01R31/327
Inventor 王同磊陆云才蔚超陶风波吴益明古洪瑞张知先祝小松
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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