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
CN103558022AActive Publication Date: 2014-02-05STATE GRID FUJIAN JINJIANG POWER SUPPLY +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID FUJIAN JINJIANG POWER SUPPLY
Publication Date
2014-02-05

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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.
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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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