Abstract：The spectral leakage has great influence on the performance of dielectric loss angle measurement when using fast Fourier transform (FFT) algorithm. Based on the analysis of the spectrum leakage effect of FFT algorithm, an improved FFT method combined Nuttall window with five-point polynomial transform to detect dielectric loss angle was presented in this paper. Since Nuttall window has a good attenuation characteristic of side lobe, and five-point polynomial transform can speed up the attenuation of side lobe spectrum, the proposed method firstly applied Nuttall window to truncate the measurement signal, then used FFT weighted polynomial transformation so as to reduce the output sequence spectrum leakage effect and improve the analysis accuracy. Through simulations and experiments, the proposed Nuttall window and five-point polynomial transform interpolated FFT algorithm is proven to be accurate and reliable. The impact factors of dielectric loss angle measurement including fundamental frequency fluctuation, number of sampling points, random noise, harmonic component, and direct current component are also analyzed in detail in this paper.
金涛, 陈毅阳, 游胜强. 基于Nuttall窗-五点变换的改进FFT介质损耗角测量算法[J]. 电工技术学报, 2015, 30(增刊2): 7-15.
Jin Tao, Chen Yiyang, You Shengqiang. An Improved FFT Algorithm for Dielectric Loss Angle Based on Nuttall Window and Five-Point Polynomial Transform. Transactions of China Electrotechnical Society, 2015, 30(增刊2): 7-15.
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2015, Vol. 30 
