Suppressing PD’s Narrow Band Noise in the PD Monitoring Frequency Band Using Complex Wavelet Packet Transform

Abstract:

By combining the method of construct wavelet packet and complex wavelets, complex wavelets packet is constructed with the same amplitude-frequency characteristics of corresponding real wavelet packet and the same phase spectrum of corresponding complex wavelets, and then give the specific method of constructing complex wavelets packet, evaluate the effect of original PD simulative signals direct reconstruction after decomposition by using Normalized Correlation Coefficient (NCC) and Variational Trend Parameter (VTP) also and the relative error of the amplitude, verify the capability of restore Non-stationary Oscillating Partial Discharge Signals effectively and the correctness of the complex wavelets packets construction. At last, complex wavelets packet is used to denoise PD admixture simulative and measured signals with different frequency and strength noises, overcome the difficults of more loss using hardware filter and bad effect using wavelets packet transformation when narrow band noise in the monitoring frequency band.

• Periodical: Applied Mechanics and Materials (Volume 521)
• Pages: 352-357
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.521.352
• Online since: February 2014
• Authors: Li Gao*, Tao Zhao, Yun Peng Liu
• Keywords: Complex Wavelet Packet, Gas Insulated Switchgear (GIS), Narrow Bandwidth Noise, Partial Discharge (PD)

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