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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 testdoi:10.1109/access.2018.2868058 fatcat:ejxclimq55aw7lj2uckxduhl6q