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Distribution switch mechanical state diagnosis method based on vibration signal cluster

A vibration signal, power distribution switch technology, applied in the testing of mechanical parts, the testing of machine/structural parts, measuring devices, etc., can solve the problem of inability to accurately analyze and process non-stationary vibration signals, and reduce the dimension of the diagnostic matrix, Guaranteed time accuracy and frequency accuracy, easy installation effect

Active Publication Date: 2014-02-05
STATE GRID FUJIAN JINJIANG POWER SUPPLY +1
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Problems solved by technology

[0004] The present invention provides a method for diagnosing the mechanical state of distribution switches based on vibration signal clustering, which overcomes the shortcomings of being unable to accurately analyze and process non-stationary vibration signals and obtain effective feature quantities from them in the process of diagnosing the mechanical state of distribution switches

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  • Distribution switch mechanical state diagnosis method based on vibration signal cluster
  • Distribution switch mechanical state diagnosis method based on vibration signal cluster
  • Distribution switch mechanical state diagnosis method based on vibration signal cluster

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Embodiment Construction

[0033] Please check figure 1 and figure 2 , a method for diagnosing the mechanical state of distribution switches based on vibration signal clustering, which includes:

[0034] Step 1, using the sensor to obtain the vibration signal of the power distribution switch;

[0035] Step 2, processing the acquired vibration signal to obtain several intrinsic mode function (IMF) components and residual components;

[0036] Step 3, Hilbert transform the obtained intrinsic mode function (IMF) component and residual component to obtain a two-dimensional Hilbert time spectrum;

[0037] Step 4, the instantaneous frequency of the two-dimensional Hilbert time spectrum is divided into equal interval intervals according to a certain frequency width to obtain multiple frequency intervals, and each frequency interval is processed as follows: the eigenmode function (IMF) outside the frequency interval is set ) component instantaneous amplitude is zero and all the instantaneous amplitudes of th...

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Abstract

The invention discloses a distribution switch mechanical state diagnosis method based on a vibration signal cluster. A vibration signal of a distribution switch is obtained through a sensor. The vibration signal is processed to obtain a plurality of eigenmode function components and remnant components to carry out the Hilbert conversion. The waveform reconstruction is carried out on the two-dimensional Hilbert time-frequency spectrum of each eigenmode function according to the frequency section to obtain a reconstruction component in the frequency section. A time-frequency matrix is constructed for the reconstruction components on all frequency sections, and the singular value decomposition is carried out on the time-frequency matrix to obtain a series of singular value vector quantities capable of reflecting the vibration signal time-frequency characteristics. The obtained singular value vector quantities of all vibration signals are combined into a comprehensive singular value matrix to serve as the diagnosis characteristic quantity of the distribution switch mechanical state. Different mechanical states of the distribution switch are recognized according to the cluster result of the comprehensive singular value matrix. The distribution switch mechanical state diagnosis method has the advantages that the mechanical states of the distribution switch can be effectively diagnosed, and different mechanical states can be intelligently recognized.

Description

technical field [0001] The invention relates to a method for diagnosing the mechanical state of a power distribution switch, in particular to a method for diagnosing the mechanical state of a power distribution switch based on vibration signal clustering. Background technique [0002] Distribution switches play a pivotal role in the entire distribution network, and whether their opening and closing operations are normal is closely related to the stability of the power grid and the reliability of power supply. To improve the reliability of the distribution network, the mechanical state of the distribution switch can be monitored to judge the mechanical state during its operation and take corresponding measures in time. [0003] During the opening and closing operation of the distribution switch, due to the movement and impact of the operating mechanism, connecting mechanism, and moving contact, a series of nonlinear and non-stationary vibration signals will be generated, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/00
Inventor 郭谋发陈立纯李文勇陈永往郑万伟曾进顺陈小鹏
Owner STATE GRID FUJIAN JINJIANG POWER SUPPLY
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