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Entropy 2018, 20(6), 448; https://doi.org/10.3390/e20060448

Mechanical Fault Diagnosis of High Voltage Circuit Breakers Utilizing EWT-Improved Time Frequency Entropy and Optimal GRNN Classifier

HLJ Province Key Lab of Senior-Education for Electronic Engineering, Heilongjiang University, Harbin 150080, China
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Received: 6 May 2018 / Revised: 4 June 2018 / Accepted: 4 June 2018 / Published: 7 June 2018
(This article belongs to the Section Information Theory, Probability and Statistics)
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Abstract

The mechanical fault diagnosis results of the high voltage circuit breakers (HVCBs) are mainly determined by the feature vector and classifier used. In order to obtain more remarkable characteristics of signals and a robust classifier which is suitable for small sample classification, in this paper, a new mechanical fault diagnosis method is proposed. Firstly, the vibration signals of HVCBs are collected by a designed acquisition system, and the noise of signals is eliminated by a soft threshold de-noising method. Secondly, the empirical wavelet transform (EWT) is adopted to decompose the signals into a series of physically meaningful modes, and then, the improved time-frequency entropy (ITFE) method is used to extract the characteristics of the vibration signals. Finally, a generalized regression neural network (GRNN) is used to identify four types of vibration signals of HVCBs, while the smoothing parameter δ of GRNN is optimized by a loop traversal method. The experimental results show that by using this optimal classifier for fault diagnosis, the proposed fault diagnosis method has the better generalization performance and the recognition rate of unknown samples is over 95%, and the signal features obtained by the ITFE method are more significant than those of the traditional TFE method. View Full-Text
Keywords: HV circuit breakers; mechanical fault diagnosis; empirical wavelet transform; improved time-frequency entropy; generalized regression neural network; loop traversal method HV circuit breakers; mechanical fault diagnosis; empirical wavelet transform; improved time-frequency entropy; generalized regression neural network; loop traversal method
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Li, B.; Liu, M.; Guo, Z.; Ji, Y. Mechanical Fault Diagnosis of High Voltage Circuit Breakers Utilizing EWT-Improved Time Frequency Entropy and Optimal GRNN Classifier. Entropy 2018, 20, 448.

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