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《Transactions of China Electrotechnical Society》 2008-07
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An Algorithm of Complex Self-Adaptive Block Threshold for Extracting PD Signal

Peng Li Tang Ju Zhang Xiaoxing Xie Yanbin(State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China)  
According to the correlation of complex wavelet coefficients and the characteristic of block threshold making the best of the surrounding wavelet coefficients,an algorithm of complex self-adaptive block threshold is put forward.The de-noising effect of complex self-adaptive block threshold is better than the one of complex self-adaptive dot threshold and self-adaptive block threshold.At the same time,the de-noising effect of the emulation PD signals is synthetically evaluated by Variational Trend Parameter(VTP),NCC and SNR.Finally,complex self-adaptive block threshold is used to suppress the white noises which are buried in ultrahigh frequency PD signals in simulated GIS of lab.The results indicate that this threshold can suppress white noise effectively with small distortion and high SNR or NNR.
【Fund】: 国家自然科学基金(50577069);; 973计划前期专项(2006CB708411)资助项目
【CateGory Index】: TM83
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