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Szukana fraza: [Abstrakt = "The subject of the article concerns recognition of defects of on load tap changers \(OLTC\) with the use of supervised learning. OLTC is a specialized device that is part of a power transformer, which allows for a step change of the gear and thus the voltage at the terminals of this transformer. The acoustic emission \(AE\) method was applied as diagnostic method. The advantage of this method lies in the possibility of its application during normal operation of the device without having to turn it off. EA signals were obtained from laboratory tests in which four types of defects \- typical OLTC damages, were simulated. The gathered signals were pre\-analyzed using digital filters and Hilbert transforms, and then subjected to the classification process. The article contains examples of EA signal waveforms and the results of preliminary research on the classification of OLTC defects with the use of seven methods together with an assessment of their effectiveness."]

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