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
CN109633431AActive Publication Date: 2019-04-16STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
Publication Date
2019-04-16

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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.
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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...

Claims

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