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The subject area of this article applies to a study of low frequency noise - mainly infrasound signals generated by the operational indoor power transformer. The object of the study is localized in south Poland with a total apparent power equal to 1250 kVA. In addition, the power transformer is located away from national roads and motorways. Scope of the performed analysis includes designation of time runs, depicting temporal changes, and designation of frequency spectra of the recorded low frequency signals. Eval...