基于振动信号EMD-HT时频分析的变压器有载分接开关故障诊断

把一列时间序列数据通过经验模态分解(empirical mode decomposition,EMD)为本征模态函数组(intrinsic mode function,IMF),然后进行希尔伯特变换(hilbert transformation,HT)得到频谱的信号时频分析方法引用到变压器有载分接开关切换机构的振动信号分析领域。笔者介绍了该方法的理论和算法。首先采用仿真信号对该方法进行仿真验证,然后把一实测的有载分接开关故障振动信号进行基于EMD-HT方法的时频分析。通过仿真和实例信号分析结果说明,用EMD-HT时频分析方法对变压器有载分接开关的振动信号进行故障特征提取是有效的。

Fault Diagnosis of Power Transformer On-load Tap Changer Based on EMD-HT Analysis of Vibration Signal

A list of time series data is decomposed into an eigen modal functions group through the empirical mode decomposition(EMD),then Hilbert transformation(HT) is adopted to get the signal frequency spectrum analysis method of reference to the transformer on-load tap changer switching mechanism of vibration signal analysis field.The authors introduces the theory and method of the algorithm,the first of the method of simulation signal simulation test,and then apply the time-frequency analysis which is based on the method of EMD-HT to a testing fault vibration signal analysis of the switching mechanism of the OLTC.Through the simulation signal and the example analysis shows that,with EMD-HT time-frequency analysis method for transformer on-load tap-changer vibration signal of the fault feature extraction is effective.