【摘要】 使用谐波分析法对介质损耗因数进行在线监测时,由电网频率波动引起的非同步采样会给系统测量带来很大误差。为实现介质损耗角的高精度测量,笔者结合现在数字信号处理芯片的处理能力,提出了加布莱克曼窗的插值DFT修正算法来分析介损的测量,并根据介损角的定义进一步对由插值算法得到的介损进行了修正。仿真结果表明,该算法得到的介损误差较小,精度受频率的波动影响较小,对介质损耗角的在线测量有一定的参考价值。更多还原

【Abstract】 The non-synchronization caused by the frequency fluctuation will cause remarkable error when the harmonic analysis method is used in the on-line monitoring of dielectric loss. In order to improve the measuring accuracy of the dielectric loss,this paper adopted the Blackman-windowed Interpolated DFT algorithm to analyze the dielectric loss angle based on the capacity of digital microprocessor, and updated the results according to the definition of dielectric loss. The simulation results demonstrate that the measuring accuracy is improved and influenced little by frequency fluctuation. So it is a worthy method for the on-line monitoring of dielectric loss.更多还原