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High-voltage vacuum circuit breaker mechanical fault diagnosis method and system

A technology for vacuum circuit breakers and mechanical faults, applied in circuit breaker testing, mechanical component testing, instruments, etc., can solve problems affecting the validity of feature quantities, fixed time-frequency resolution, and large computational load, and achieve accurate judgment. , quick identification, simple structure effect

Pending Publication Date: 2020-12-15
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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AI Technical Summary

Problems solved by technology

The existing signal processing methods are mainly wavelet packet decomposition and empirical mode decomposition, but how to choose a suitable basis function is a difficult problem in wavelet packet analysis. Empirical mode decomposition also has boundary effects and modal aliasing phenomena, which affect the quality of feature quantities. effectiveness
As the inheritance and development of wavelet transform and short-time Fourier transform, S transform eliminates the choice of window function and improves the disadvantage of fixed window width. There are certain restrictions in its use

Method used

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  • High-voltage vacuum circuit breaker mechanical fault diagnosis method and system
  • High-voltage vacuum circuit breaker mechanical fault diagnosis method and system
  • High-voltage vacuum circuit breaker mechanical fault diagnosis method and system

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Embodiment Construction

[0041] The present invention is described in further detail below in conjunction with accompanying drawing:

[0042] combine figure 1 The steps of a method for diagnosing a mechanical fault of a high-voltage vacuum circuit breaker according to the present invention are specifically described, including the following steps:

[0043] Step 1. Establish an experimental platform for a high-voltage vacuum circuit breaker with an electromagnetic repulsion mechanism, and simulate 5 kinds of faults, namely: fault 1-control circuit voltage is too low (85% of rated voltage), fault 2-control circuit voltage is too high (110% of rated voltage ), fault 3-increased resistance of the control loop (simulated coil aging), fault 4-buffer jamming, fault 5-base fixing screws loose. After comprehensively analyzing the vibration signals at different positions of the circuit breaker, select positions 1 and 2 to install acceleration sensors to collect vibration signals, such as figure 2 shown. In ...

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Abstract

The invention discloses a high-voltage vacuum circuit breaker mechanical fault diagnosis method and system. The method comprises the steps: obtaining vibration signals at two different positions of ahigh-voltage vacuum circuit breaker of an electromagnetic repulsion mechanism through an acceleration sensor; carrying out time-frequency analysis on the obtained vibration signals at the two different positions in the same group through S transformation, and obtaining an S transformation mode matrix; and extracting energy entropy from the S transformation mode matrix as a feature vector to traina vector machine model, and obtaining a support vector machine training model. By means of the characteristic that the S transformation time-frequency resolution is high, energy distribution of the signals in a time-frequency plane can be visually seen after the vibration signals are subjected to S transformation, and the distinguishability in different states is high; the proposed fault diagnosismodel achieves a better diagnosis effect, and a new idea is provided for the mechanical fault diagnosis of the high-voltage vacuum circuit breaker under a small sample; and the mechanical fault occurring in the high-voltage vacuum circuit breaker of the electromagnetic repulsion mechanism can be accurately, reliably and quickly identified.

Description

technical field [0001] The invention belongs to the technical field of electrical fault detection, and in particular relates to a method and system for diagnosing a mechanical fault of a high-voltage vacuum circuit breaker. Background technique [0002] In recent years, high-voltage vacuum circuit breakers have been widely used and developed in power systems. But at the same time, the power system also puts forward higher requirements for rapidity, reliability and economy for its mechanical switches and operating mechanisms. Therefore, a new type of electromagnetic repulsion mechanism has been applied in high-voltage vacuum circuit breakers. At present, the research on the electromagnetic repulsion mechanism mainly focuses on the design and improvement of the mechanical structure, ignoring the problem of its mechanical failure. Therefore, it is necessary to monitor and diagnose the mechanical faults in the electromagnetic repulsion mechanism. [0003] At present, the mech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327G01M13/00
CPCG01R31/3272G01R31/3275G01M13/00
Inventor 苏海博张宇王勇莫文雄顾乐乔胜亚刘俊翔郑方晴林李波陈俊
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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