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A method for diagnosing mechanical faults of high-voltage circuit breakers

A high-voltage circuit breaker and mechanical failure technology, applied in the field of electric power equipment, can solve the problems of labor, fatigue, time-consuming disassembly and maintenance of components, etc., and achieve the effect of avoiding insufficient representation ability and weakening the impact value.

Active Publication Date: 2022-06-07
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regular maintenance is not only time-consuming and laborious, but repeated disassembly and overhaul may cause component fatigue and even generate new faults during the maintenance process; in addition, the diagnostic results of regular maintenance depend on the experience evaluation of maintenance personnel, which has a certain degree of subjectivity

Method used

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  • A method for diagnosing mechanical faults of high-voltage circuit breakers
  • A method for diagnosing mechanical faults of high-voltage circuit breakers
  • A method for diagnosing mechanical faults of high-voltage circuit breakers

Examples

Experimental program
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Embodiment

[0140] In this embodiment, the indoor high-voltage AC vacuum circuit breaker with the model ZN63A-12 (VS1) is selected, and its operating mechanism is a spring energy storage type; the piezoelectric acceleration sensor with the model LC0102T is selected; the USB- 6211 type multi-function data acquisition module; the upper computer software is programmed by LabVIEW.

[0141] In this embodiment, the studied mechanical states of the high-voltage circuit breaker include: normal state; the loose state of the base is constructed by loosening the screws between the base and the circuit breaker; the abnormal state of the shaft pin is constructed by adjusting the bottom shaft pin of the A phase. In view of the fact that the vibration intensity of the high-voltage circuit breaker when it is closed is greater than that when it is opened, the propagation path of the generated vibration signal is more complicated and the information contained is more diverse. Therefore, the closing vibratio...

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Abstract

The invention relates to a method for diagnosing a mechanical fault of a high-voltage circuit breaker. Firstly, the vibration signal of the high-voltage circuit breaker is obtained through the acquisition device; then, the vibration signal is decomposed by CEEMDAN, and the time-frequency matrix of equal bandwidth is constructed by using the frequency band division method based on the combination of Hilbert transform and band-pass filtering; secondly, the time-frequency matrix of equal bandwidth is constructed by dividing the period block energy matrix, and extract the time-frequency entropy from the normalized energy matrix in the time-domain direction and frequency-domain direction respectively; moreover, the normal cumulative distribution function (NCDF) is used to normalize the vibration signals of each frequency band, and extract The singular entropy of the time-frequency matrix of each block; finally, the integrated extreme learning machine is used as a classifier for the identification of small-sample high-voltage circuit breaker mechanical faults. It is verified by examples that the method of the present invention has a high degree of recognition.

Description

technical field [0001] The invention relates to the field of electric power equipment, in particular to a method for diagnosing mechanical faults of a high-voltage circuit breaker. Background technique [0002] The high-voltage circuit breaker is an important switch device in the power system, which has the dual function of controlling and protecting the power grid. Under normal working conditions, the high-voltage circuit breaker carries the current and controls the on-off of the power grid. When a fault occurs somewhere in the power grid, the high-voltage circuit breaker first responds to protection; if the fault cannot be eliminated or isolated in time, the backup protection system will spread to a wider network, causing more overhead lines, busbars, and substations to be interrupted. In addition, the more serious problem is the dynamic stability of the power system. Therefore, the rapid, effective and reliable elimination or isolation of faults by high-voltage circuit ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G01R31/327G01M13/00G06N3/04
Inventor 高伟乔苏朋郭谋发洪翠翁秉钧
Owner FUZHOU UNIV
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