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Method for diagnosing mechanical states of distribution switch on basis of EMD sample entropy and FCM

A technology of mechanical state and power distribution switch, applied in the direction of using electrical devices, using electromagnetic means, measuring devices, etc., can solve the problem that the maintenance strategy cannot meet the requirements of safe, reliable and economical operation of the power grid.

Active Publication Date: 2014-08-06
STATE GRID FUJIAN JINJIANG POWER SUPPLY +2
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Problems solved by technology

[0004] At present, the reliability, universality and economy of distribution switch status monitoring methods based on different principles need to be improved; the planned maintenance strategy of distribution switches based on "after-event maintenance" and "due mandatory maintenance" cannot meet the requirements of modern Requirements for Safe, Reliable and Economical Operation of Power Grids

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  • Method for diagnosing mechanical states of distribution switch on basis of EMD sample entropy and FCM
  • Method for diagnosing mechanical states of distribution switch on basis of EMD sample entropy and FCM
  • Method for diagnosing mechanical states of distribution switch on basis of EMD sample entropy and FCM

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specific Embodiment approach

[0069] The specific implementation method is as follows: install the piezoelectric acceleration sensor near the main shaft of the switch operating mechanism, and collect the switch opening and closing vibrations under three types of states: normal state, mechanical structure jamming state and base screw loosening with a sampling frequency of 80kHz Signal. Considering that random factors such as the environment in the experiment may have an impact on the vibration signal, the vibration signals in the above three types of mechanical states were collected 3-5 times respectively, and the waveform signals in the same state were compared. If the same characteristic information is obtained, it can be used as an effective signal for further analysis. The closing vibration signals of the distribution switch under the above three types of mechanical states are analyzed, and 3 groups are taken as sample data for each type of mechanical state, and 2 groups are randomly selected as the sta...

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Abstract

The invention discloses a method for diagnosing mechanical states of a distribution switch on the basis of empirical mode decomposition (EMD) sample entropy and fuzzy c-means clustering (FCM). The method comprises the following steps that a piezoelectric accelerometer is mounted near to a main shaft of a switch operating mechanism, and the vibration signals of the distribution switch of different mechanical states at the off and on moments are collected through a data acquisition card and a waveform display storage platform; EMD time frequency decomposition is carried out on the collected vibration signals to obtain the limited number of intrinsic mode components of different frequency and unequal bandwidths and residual error components; the sample entropies of intrinsic mode functions (IMFs) of all orders of the vibration signals of different mechanical states are calculated, and a sample entropy array is formed as the characteristic quantity of the mechanical states of the distribution switch; the sample entropy array is used as the input of the FCM, and the mechanical states of the distribution switch are diagnosed through a fuzzy clustering method.

Description

technical field [0001] The invention relates to the technical field of mechanical fault diagnosis of distribution network switches, in particular to a distribution switch mechanical state based on empirical mode decomposition (empiricalmidedecomposition, EMD) sample entropy and fuzzy C-means clustering (fuzzy C-means, FCM) diagnosis method. Background technique [0002] The power distribution switch has dual functions of control and protection in the distribution network. It realizes switching of power equipment according to production requirements. The mesh is removed quickly and efficiently. Therefore, the failure of distribution switches may lead to serious grid accidents, and most of the failures of distribution switches are mechanical failures. [0003] During the opening and closing process of the distribution switch, the components inside the operating mechanism act in sequence to form an excitation source and thus generate a vibration signal. The vibration signal ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H11/08
Inventor 郭谋发王灿星陈永往陈立纯郑鹏鹏曾进顺陈小鹏
Owner STATE GRID FUJIAN JINJIANG POWER SUPPLY
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