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000000314 037__ $$aENY-ARTICLE-2009-253
000000314 041__ $$aeng
000000314 100__ $$aLeonowicz, Z$$uWroclaw University of Technology, Poland
000000314 245__ $$aAnalysis of non-stationary electric signals using the  S-transform 
000000314 260__ $$c2008-11-04
000000314 300__ $$a7p
000000314 500__ $$aCompel, Vol. 28, No. 1, 2009
000000314 520__ $$aPurpose – The purpose of this paper is to compare the accuracy of tracking the amplitude and frequency changes of non-stationary electric signals. Design/methodology/approach – Short-time fourier transform (STFT) and S-transform algorithms were applied to analyze non-stationary signals originating from switching of capacitor banks in a power system. Findings – The S-transform showed possibilities of sharp localization of basic component, and allowed improvement of tracking dynamism the transient components in comparison to STFT. Practical implications – S-transform is a better tool for the analysis non-stationary waveforms in power systems and its properties can be used for diagnostic and power quality applications. Originality/value – The dynamic tracking of the changes in time and frequency of real-like signals originating from a power system were investigated in this paper.
000000314 6531_ $$aElectric power transmission
000000314 6531_ $$aFourier transforms
000000314 6531_ $$aElectric power systems
000000314 6531_ $$aS-transform
000000314 700__ $$aLobos, T$$uWroclaw University of Technology, Poland
000000314 700__ $$aWozniak, K$$uWroclaw University of Technology, Poland
000000314 8560_ $$fleon99@pwr.wroc.pl
000000314 8564_ $$uhttp://zet10.ipee.pwr.wroc.pl/record/314/files/$$zAccess to Fulltext
000000314 909CO $$ooai:zet10.pwr.wroc.pl:314$$pglobal
000000314 980__ $$aARTICLE