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A high-voltage circuit breaker mechanical fault diagnosis method

A high-voltage circuit breaker and mechanical failure technology, applied in the field of electric power equipment, can solve problems such as laboriousness, fatigue of dismantling and repairing parts, and new failures

Active Publication Date: 2019-06-28
FUZHOU UNIV
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  • Summary
  • 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 high-voltage circuit breaker mechanical fault diagnosis method
  • A high-voltage circuit breaker mechanical fault diagnosis method
  • A high-voltage circuit breaker mechanical fault diagnosis method

Examples

Experimental program
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Embodiment

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

[0141] In this embodiment, the mechanical state of the high-voltage circuit breaker studied includes: normal state; the loose state of the base constructed by loosening the screws between the base and the circuit breaker; the abnormal state of the pivot pin constructed by adjusting the pivot pin at the bottom of phase A. Since the vibration intensity of high-voltage circuit breaker closing is greater than that of opening, the propagation path of the generated vibration signal is more complicated, and the information contained is more diverse. Therefore, the high-voltage circuit breaker closing vibration signal is selected as the id...

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Abstract

The invention relates to a mechanical fault diagnosis method for a high-voltage circuit breaker. Firstly, a high-voltage circuit breaker vibration signal is acquired through an acquisition device; secondly, CEEMDAN decomposition is performed on the vibration signal, and a time-frequency matrix with equal bandwidth is constructed by adopting a frequency band division method based on the combinationof Hilbert transformation and band-pass filtering; time periods are divided to construct a block energy matrix, and time-frequency entropies are extracted from the normalized energy matrixes in the time domain direction and the frequency domain direction respectively; thirdly, normalization processing is conducted on the vibration signals of all the frequency bands through a normal state cumulative distribution function (NCDF), and the singular entropy of the time-frequency matrixes of all the blocks is extracted; and finally, an integrated extreme learning machine is used as a classifier foridentifying the mechanical fault of the small-sample high-voltage circuit breaker. Example verification proves that the method provided by the invention has relatively high identification degree.

Description

technical field [0001] The invention relates to the field of electric power equipment, in particular to a method for diagnosing a mechanical fault of a high-voltage circuit breaker. Background technique [0002] High voltage circuit breaker is an important switchgear in the power system, which has the dual functions of controlling and protecting the power grid. Under normal working conditions, high-voltage circuit breakers carry current and control the on-off of the power grid. When a fault occurs somewhere in the power grid, the high-voltage circuit breaker will first make a protective response; 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, it is a prerequisite to ensure the stable operation of the power system that the high-voltage circu...

Claims

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Application Information

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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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