Electrical Engineering Wroclaw University of Technology

Electrical Engineering Wroclaw University of Technology 192 records found  previous26 - 50nextend  jump to record: Search took 0.02 seconds. 
26. Power Quality Analysis of Grid-Connected Wind Turbine System / Janik, P ; Lobos, T ; Rezmer, J ; Sikorski, T [ENY-ARTICLE-2009-262]
In this paper time-frequency methods have been investigated for complex investigations of transient states in wind power plants. [...]
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27. Wavelets an Hilbert Transform methods for detection of voltage dips and micro interruptions / Caciotta, M ; Giarnetti, S ; Leccese, F ; Leonowicz, Z ; et al [ENY-PREPRINT-2009-009]
In electrical energy power network, disturbances can cause problems in electronic devices therefore their monitoring is fundamental in Power Quality field both to properly dimension protections and to calculate compensations in case of malfunction of the apparatus. [...]
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28. Analysis of non-stationary electric signals using the S-transform / Leonowicz, Z ; Lobos, T ; Wozniak, K [ENY-ARTICLE-2009-253]
Purpose – The purpose of this paper is to compare the accuracy of tracking the amplitude and frequency changes of non-stationary electric signals. [...]
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29. Identification of Out-of-Step Operation of Synchronous Machines Using High Resolution Spectrum Estimation Methods / Koglin, H J ; Leonowicz, Z ; Lobos, T [RK I07/2002/I-046] [ENY-ARTICLE-2009-252]
The out-of-step operation conditions of a synchronous machine may occur as a result of a power system three-phase fault. [...]
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30. Modern spectral analysis of non-stationary signals in electrical power systems / Leonowicz, Z ; Lobos, T ; Schegner, P [RZ I07/2002/I-048] [ENY-ARTICLE-2009-251]
A novel approach to harmonic and interharmonic analysis, based on the “subspace” methods, is proposed. [...]
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31. Advanced spectral analysis of out-of-step operation of synchronous machines / Leonowicz, Z ; Lobos, T [RZ I07/2003/I-068] [ENY-ARTICLE-2009-250]
The out-of-step operation conditions of a synchronous machine may occur as a result of a power system three-phase fault. [...]
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32. Automatic Fault Classification in Power Electronics Using Time-Frequency Distribution and Neural Networks / Leonowicz, Z ; Lobos, T [RZ I07/2003/I-077] [ENY-ARTICLE-2009-249]
A new method of fault analysis and detection by signal classification in frequency converters is presented. [...]
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33. Trimmed estimators for robust averaging of event-related potentials / Leonowicz, Z ; Karvanen, J ; Shishkin, S L [AZ I07/2005/I-002] [ENY-ARTICLE-2009-248]
Averaging (in statistical terms, estimation of the location of data) is one of the most commonly used procedures in neuroscience and the basic procedure for obtaining event-related potentials (ERP). [...]
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34. A Two-Stage Method of Localization of Sources of Harmonics in Current in a Power System / Pyzalski, T ; Wilkosz, K [ENY-ARTICLE-2009-247]
The paper deals with localization of sources of harmonics in a power system. [...]
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35. Determination of Resonant Frequencies for a Power System: A New Approach / Sulka, T ; Wilkosz, K [ENY-ARTICLE-2009-246]
The paper deals with the harmonic resonance problem. [...]
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36. Probabilistic Analysis of Voltage Deviations in the Distribution Network with Small Synchronous Generators / Sobierajski, M ; Rojewski, W [ENY-ARTICLE-2009-245]
Fulfilling voltage quality requirements may produce the bottleneck of sending the whole local generation to the medium voltage network. [...]
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37. Model order selection criteria: comparative study and applications / Leonowicz, Z ; Karvanen, J ; Tanaka, T ; Rezmer, J [AK I07/2005/I-002] [ENY-ARTICLE-2009-244]
A practical application of information theoretic criteria is presented in this paper. [...]
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38. EEG filtering based on blind source separation (BSS) for early detection of Alzheimer's disease / Cichocki, A ; Shishkin, S L ; Musha, T ; Leonowicz, Z ; et al [AZ I07/2005/I-022] [ENY-ARTICLE-2009-243]
Objective: Development of an EEG preprocessing technique for improvement of detection of Alzheimer’s disease (AD). [...]
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39. Spectrum estimation methods for signal analysis in the supply system of DC arc furnace / Leonowicz, Z ; Lobos, T ; Rezmer, J [RZ I07/2005/I-023] [ENY-ARTICLE-2009-242]
In this paper, Prony and root-MUSIC methods are applied for analysis of waveforms from the DC arc furnace supply. [...]
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40. Waveform Distortions due to AC/DC converters feeding DC arc furnaces / Bracale, A ; Carpinelli, G ; Leonowicz, Z ; Lobos, T ; et al [RK I07/2005/I-039] [ENY-ARTICLE-2009-241]
The line-commutated converters cause significant harmonic distortions in electrical power systems. [...]
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41. Performance of parametric spectrum estimation methods / Leonowicz, Z [RK I07/2006/I-019] [ENY-ARTICLE-2009-240]
W pracy przedstawiono porównanie dokładności wyznaczania częstotliwości i amplitudy składowych sygnałów harmonicznych odkształconych przy pomocy parametrycznych metod estymacji widma: MUSIC i ESPRIT. [...]
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42. Automated Classification of Power Quality Disturbances using SVM and RBF Networks / Janik, P ; Lobos, T [ENY-ARTICLE-2009-239]
The authors propose a new method of power quality classification using SVM (Support Vector Machine) neural networks. [...]
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43. Two Brain Signal (EEG) processing applications / Leonowicz, Z [ENY-ARTICLE-2009-238]
Trimmed estimators are a class of robust estimators of data locations which can help to improve averaging of experimental data when: number of experiments is small, data are highly nonstationary, data include outliers. [...]
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44. Effect of silicone rubber insulators' profiles on their ageing performance in rain conditions / Bretuj, W ; Fleszynski, J ; Tyman, A ; Wieczorek, K [ENY-ARTICLE-2009-236]
Numerous studies have been conducted to understand the effect of insulator profiles on ceramic insulators, whereas for polymer insulators this problem has not sufficiently examined. [...]
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45. X-Ray Emission Accompanying the Cathode Microdischarge / Mazurek, B ; Nowak, A ; Tyman, A [ENY-ARTICLE-2009-235]
Electrical discharge in vacuum is accompanied by X-ray radiation and knowledge of the generation mechanism of radiation may lead to its practical use. [...]
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46. Internal Arcing Test on Polluted High Voltage Surge Arresters / Chrzan, K L ; Kohler, W ; Feser, K [ENY-ARTICLE-2009-234]
A test to prove the performance of extremely non-uniform polluted single unit metal oxide (MO) and gapped arresters (SiCA) is presented. [...]
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47. Influence of High Voltage Insulator on Pollution Flashover Voltage / Wankowicz, J G ; Pohl, Z [ENY-ARTICLE-2009-233]
Results of pollution flashover voltage measurements and optical observation obtained for high voltage insulators placed in the vertical and the horizontal positions are presented. [...]
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48. Insulators Glaze Modified by Plasma Processes / Tyman, A ; Pospieszna, J ; Juchniewicz, J [ENY-ARTICLE-2009-232]
Surface properties of electrical insulators are responsible for their behaviour, especially during heavy rains in contaminated areas. [...]
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49. Special Insulator for Installation of Optical Phase Conductor on 15 kV Line / Argasinska, H ; Fleszynski, J ; Sojda, E ; Tyman, A [ENY-ARTICLE-2008-231]
Thanks to the recent improvements in the technology of glass fibres and the development of digital data transmission techniques, optical fibres have made their way into power distribution and industry. [...]
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50. Effects of Surface Modification of Polypropylene Foil on Polymer - Oil Interaction / Pospieszna, J ; Tyman, A ; Juchniewicz, J [ENY-ARTICLE-2008-229]
Physico-chemical interactions between the impregnating oil and the polypropylene foil (PP) are of great concern. [...]
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