Archives of Acoustics, 42, 1, pp. 29–35, 2017
10.1515/aoa-2017-0004

Application of the Acoustic Emission Method for Diagnosis in On-Load Tap Changer

Henryk MAJCHRZAK
Opole University of Technology
Poland

Andrzej CICHOŃ
Opole University of Technology
Poland

Sebastian BORUCKI
Opole University of Technology
Poland

This paper provides an example of the application of the acoustic emission (AE) method for the diagnosis of technical conditions of a three-phase on-load tap-changer (OLTC) GIII type. The measurements were performed for an amount of 10 items of OLTCs, installed in power transformers with a capacity of 250 MVA. The study was conducted in two different OLTC operating conditions during the tapping process: under load and free running conditions. The analysis of the measurement results was made in both time domain and time-frequency domain. The description of the AE signals generated by the OLTC in the time domain was performed using the analysis of waveforms and determined characteristic times. Within the time-frequency domain the measured signals were described by short-time Fourier transform
spectrograms.
Keywords: acoustic emission; partial discharge; transformer diagnostics
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DOI: 10.1515/aoa-2017-0004

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