Szukana fraza: [Abstrakt = "The subject area of this article applies to study of infrasound signals generated by transformers. The tests were carried out on medium voltage transformers which reduce the voltage from 15 kV to 0.4 kV, using oil and dry insulation with nominal apparent power in the range from 150 kVA to 1250 kVA. Moreover, the transformers working in overhead and indoor were compared. Scope of the analysis performed included designation of time runs, depicting temporal changes, and designation of frequency spectra of the recorded infrasound signals."]

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