Abstract

GOMEZ-LUNA, Eduardo; CUARTAS-BERMUDEZ, Juan Sebastián  and  MARLES-SAENZ, Eduardo. Obtaining the electrical impedance phase using Wavelet transform and Fourier transform from transient signals. Part 2: practical assessment and validation. Dyna rev.fac.nac.minas [online]. 2018, vol.85, n.205, pp.105-110. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v85n205.68458.

This article presents a practical assessment and validation of the new proposed approach based on the continuous wavelet transform (CWT) to obtain the electrical impedance phase from online transient signals for a real transformer. Besides the mathematical procedure presented in a previous paper, an electronic system was also designed and implemented, in order to inject superimposed controlled pulses to the power system (50/60 Hz) wave. The results show improved performance of the wavelet transform compared to that of the Fourier Transform, for transient signal analysis to be applied on a nonintrusive transformer monitoring approach. Particularly, this new approach proves useful in overcoming problems related to signal filtering and signal processing in an online frequency-response analysis of a transformer diagnosis.

Keywords : continuous wavelet transform (CWT); frequency response; online supervision and control; power system transients and transformers.

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