基于比值法的铁磁谐振过电压分类研究

在变电站实测过电压波形基础上，根据铁磁谐振过电压发生机理及波形特征，将小波变换良好的时频局部化特性和傅里叶变换良好的频域分析能力有机结合，提取了能够有效反映铁磁谐振过电压的特征参量，并提出利用比值法识别铁磁谐振过电压的方法。结果表明该理论基础直观，大量现场实测数据验证了该方法在识别铁磁谐振过电压时的有效性和可靠性。

Study on the classification of ferromagnetic resonance overvoltage based on ratio method

Based on the actual overvohage waveform in substation, according to the mechanism and waveform characteristic of ferromag- netic resonance overvohage, combined the good time-frequency localization characteristic of wavelet transform with the good frequency- domain analysis ability of Fourier transform, this paper extracted the characteristic parameters that could effectively reflect ferromagnetic resonance overvoltage, and proposed a method to recognize ferromagnetic resonance overvoltage with ratio method. The result showed that the theoretical basis was visual. A large number of field measured data verified the effectiveness and reliability of method during recognizing ferromagnetic resonance overvoltage.