TY - JOUR N2 - The one-dimension frequency analysis based on DFT (Discrete FT) is sufficient in many cases in detecting power disturbances and evaluating power quality (PQ). To illustrate in a more comprehensive manner the character of the signal, time-frequency analyses are performed. The most common known time-frequency representations (TFR) are spectrogram (SPEC) and Gabor Transform (GT). However, the method has a relatively low time-frequency resolution. The other TFR: Discreet Dyadic Wavelet Transform (DDWT), Smoothed Pseudo Wigner-Ville Distribution (SPWVD) and new Gabor-Wigner Transform (GWT) are described in the paper. The main features of the transforms, on the basis of testing signals, are presented. L1 - http://www.czasopisma.pan.pl/Content/107066/PDF/Journal10178-VolumeXVII%20Issue3_06%20paper.pdf L2 - http://www.czasopisma.pan.pl/Content/107066 PY - 2010 IS - No 3 EP - 396 DO - 10.2478/v10178-010-0032-6 KW - Discreet Dyadic Wavelet Transform (DDWT) KW - Gabor-Wigner Transform (GWT) KW - Multiresolution Analysis (MRA) KW - Power Quality (PQ) KW - Smoothed Pseudo Wigner-Ville Distribution (SPWVD) A1 - Mroczka, Janusz A1 - Szmajda, Mirosław A1 - Górecki, Krzysztof PB - Polish Academy of Sciences Committee on Metrology and Scientific Instrumentation DA - 2010 T1 - Gabor Transform, SPWVD, Gabor-Wigner Transform and Wavelet Transform - Tools For Power Quality Monitoring SP - 383 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/107066 T2 - Metrology and Measurement Systems ER -