Improved Method to Obtain the Online Impulse Frequency Response Signature of a Power Transformer by Multi Scale Complex CWT

Zhongyong Zhao, Chao Tang, Chenguo Yao, Qu Zhou, Lingna Xu, Yingang Gui, Syed Islam
2018 IEEE Access  
Improved method to obtain the online impulse frequency response signature of a power transformer by multi scale complex CWT, IEEE Access, 6, 48934-48945. ABSTRACT Online impulse frequency response analysis (IFRA) has proven to be a promising method to detect and diagnose the transformer winding mechanical faults when the transformer is in service. However, the existing fast Fourier transform (FFT) is actually not suitable for processing the transient signals in online IFRA. The field test
more » ... also shows that the IFRA signature obtained by FFT is easily distorted by noise. An improved method to obtain the online IFRA signature based on multi-scale complex continuous wavelet transform is proposed. The electrical model simulation and online experiment indicate the superiority of the wavelet transform compared with FFT. This paper provides guidance on the actual application of the online IFRA method. INDEX TERMS Impulse frequency response, power transformers, windings, complex CWT, fast Fourier transform, electrical model. 48934 2169-3536
doi:10.1109/access.2018.2868058 fatcat:ejxclimq55aw7lj2uckxduhl6q