To address the problem of spectrum leakage and fence effect caused by the fluctuation of grid frequency when measuring the re-sistive current of zinc oxide arrester(MOA)by the traditional harmonic analysis method based on FFT,the paper improves the Nuttall window tri-spectral interpolation algorithm by using hardware to detect the fundamental frequency and derive the relevant calculation formula,which reduces the calculation volume of the original algorithm and proposes an improved harmonic analysis method by combines the improved algorithm with the adaptive adjustment of sampling frequency,which can effectively solve the above problems and improve the accuracy of resistive current measurement.The accuracy and stability of the improved harmonic algorithm are verified by simulation,and the software and hardware design of the online monitoring system of zinc oxide arrester based on this algorithm is carried out.The test results show that the system has stable performance,high accuracy,and can effec-tively realize the online monitoring of MOA status.
metal zinc-oxide arresteron-line monitoringharmonic analysis methodNuttall windowadaptive adjustmentsampling frequency
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