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| Application of WPT Method for Improving the Measurement Precision of Impulse Current Waveform |
| YUAN Haiyan1,FU Zhengcai1CHEN Yongbin2 |
| (1. School of Electronic, Information and Electrical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 2. Jiaxing Meteorological Bureau of Zhengjiang Province, Jiaxing 314050, China) |
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Abstract The wavelet packet transform (WPT) method was proposed to denoise for the measured wave in the impulse current test. The four denoising methods, including the WPT method, the Fourier transform, the curve fitting and the wavelet transform method, were used to denoise for the same waveform with noise. Also, the denoised waveform parameters were calculated. The research indicates that the noise frequency has no impact on the denoising results. The error of waveform parameters denoised with WPT is the least. The influence on the wave front is little and the magnitude of denoised wave is almost the same with the standard wave. On the contrary, the error of denoised wave with curve fitting is the maximal. The investigation on the measured wave verifies that WPT is the most precise and practical method.
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Received: 09 September 2009
Published: 28 July 2010
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