Analysis of Interference Signals Generated by Vibroacoustic Vibrations of Transformer Cores |
| T. Boczar, S. Borucki and A. Cichoń
Institute of Power Engineering and Renewable Energy, Faculty of Electrical Engineering, Automatic Control, and Computer Science, Opole University of Technology, Prószkowska 76, 45-758 Opole, Poland |
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| The article deals with the subject matter referring to the interference that may accompany measurements of vibroacoustic signals, generated by electric power transformers, taken by using the acoustic emission method under industrial conditions. Paper concerns measurement and analysis of internal, acoustic type disturbances, including the magnetostrictive vibrations of plate sets within the transformer core, caused by changes in the magnetic flux. Paper presents measurement results of acoustic interfering signals and results of analyses made in the frequency and time-frequency domains. Power spectral density, MUSIC pseudospectra, two- and three-dimensional short time Fourier transform: spectrograms, continuous wavelet transform scalograms, discrete wavelet transform, and quantities of energy transferred are included in the paper. |
DOI: 10.12693/APhysPolA.125.1355 PACS numbers: 79.60.Bm, 42.79.Pw, 52.80.Hc |