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Wyświetlanie 31-45 z 49
Tytuł:
Ocena wpływu warunków meteorologicznych na sprawność turbin wiatrowych
Evaluation of the influence of weather conditions on the efficiency of wind turbines
Autorzy:
Boczar, T.
Szczyrba, T.
Powiązania:
https://bibliotekanauki.pl/articles/155905.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
turbiny wiatrowe
elektrownie wiatrowe
warunki atmosferyczne
sprawność
wydajność
efektywność
wind turbines
weather conditions
efficiency
effectiveness
productivity
Opis:
Podstawowym celem przeprowadzonych badań było określenie wpływu zmian gęstości powietrza atmosferycznego na wyniki obliczeń wskaźników charakteryzujących sprawność elektrowni wiatrowych. W części wynikowej przedstawiono wykresy obrazujące wpływ zarejestrowanych parametrów atmosferycznych na przebiegi krzywej mocy i wartości sprawności. Zależności zostały wyznaczone na podstawie rejestracji temperatury, ciśnienia i wilgotności powietrza atmosferycznego, które wykonano dla dwóch turbin wiatrowych Tacke Tw 600.
The main objective of the studies whose results are presented in this paper was to determine the impact of air density changes on the calculation results of indicators characterizing the efficiency of a wind power plant. It was assumed that the efficiency is described by the amount of electricity generated in a specified period of time, under existing weather conditions for the given location and when taking into account the generated energy quality and the real efficiency of components of the wind turbine generators and their control systems. The equipment used for measuring purposes, location of measuring instruments and their calibration methods are characterized in the descriptive part of the paper. Additionally, basic recommendations on the methodology of measuring the ambient air temperature, pressure and humidity in order to determine the wind turbine efficiency are given. In the part of the paper presenting the results there are shown the graphs illustrating the impact of the recorded atmospheric parameters on the courses of the empirical power curve and the real efficiency value. The dependencies were determined on the basis of the recorded ambient air values of temperature, pressure and humidity in summer, autumn and winter periods for the two Tacke Tw 600 wind turbines. Respectively, Figs. 2-5 show the graphs presenting the impact of changes of the recorded air temperature, atmospheric pressure, relative humidity and air density on the course of the empirical power curve and the real efficiency value (Fig. 6) of the wind turbines being studied.
Źródło:
Pomiary Automatyka Kontrola; 2012, R. 58, nr 12, 12; 1044-1047
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repeatability Estimation for Vibration Measurement Results of Power Transformer Core
Autorzy:
Borucki, S.
Cichon, A.
Skubis, J.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1198972.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The subject matter of this paper refers to the diagnostics of a transformer core, based on measurements and analysis of vibroacoustic signals registered during their normal operation. The paper presents results of the research aimed to evaluate the repeatability of vibration measurements for power transformer core. Recording of vibroacoustic signals was performed under laboratory conditions on dry-insulated transformers. The study concerned evaluation of changes in vibroacoustic indicators of the transformer core during operation with a turned and loosened core. Conclusions from the measurement results were drawn on the basis of the parametric test of significance derived from the variance analysis for many means of single classification basing on the Fisher-Snedecor F-distribution.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1299-1302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Results of Optical Signals Analyses Emitted by Electrical Discharges Recorded with UV Camera
Autorzy:
Frącz, P.
Boczar, T.
Borucki, S.
Cichoń, A.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/1417952.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Bm
42.79.Pw
52.80.Hc
Opis:
In the article results of measurements and analyses of the optical signals emitted by electrical surface partial discharges occurring on bushing and post insulators, recorded with UV camera during tests under laboratory conditions are presented. The carried out research was to determine the effect of the distance between the insulator's electrodes and the voltage value on the number of partial discharges.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 814-817
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving a Set of Spherical Equations for Localization of Partial Discharges by Acoustic Emission Method
Autorzy:
Boczar, T.
Witkowski, P.
Borucki, S.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401873.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
This article deals with the subject matter of improvement of the acoustic emission methods used for location of partial discharges, which may occur inside power transformer insulation systems. Analytical solutions of spherical equations for location of partial discharge generation using the acoustic method were shown in detail. Presented in the article method of solving the assumed equations is based on the analytical method and matrix notation. Theoretical considerations and later the measurement-based verification refer to the use of the triangulation method for location of the occurrence of partial discharges. The results of the scientific and research works that have been presented in this article are the next stage of research aimed at development of on-line diagnosis system for insulation systems of electrical equipment, allowing for detection, measurement and identification of forms and locations of partial discharges using the acoustic emission method.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 299-305
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Infrasound Noise Emitted by Wind Turbines of Large Power
Autorzy:
Boczar, T.
Malec, T.
Wotzka, D.
Powiązania:
https://bibliotekanauki.pl/articles/1418027.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.28.Dm
07.10.-h
46.40.-f
43.50.-x
43.50.+y
Opis:
The subject area of this article applies to study of infrasound signals generated by the work of modern wind turbines. Infrasound noise measurements were conducted in accordance with assumptions of the EN 61400-11 standard. The object of study was a newly commissioned wind farm with a total electrical power equal to 30 MW. The considered power station consisted of 15 new wind turbines, each with a capacity of 2 MW. Scope of the analysis performed included designation of time runs, depicting temporal changes, and designation of frequency spectra of the recorded infrasound signals. Evaluation of the impact of changes in wind speed was made. Moreover, the scope of analysis, performed in this field, concerned assessment of the impact on the obtained results values of meteorological parameters related to the applied measurement system. Values obtained from measurements were related to and compared with the limits specified in standards and regulations existing in this field.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 850-853
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studies on Infrasound Noise Generated by Operation οf Low-Power Wind Turbine
Autorzy:
Pierzga, R.
Boczar, T.
Wotzka, D.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/1399396.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.28.Dm
43.50.Ed
43.50.Cb
43.50.Rq
43.50.Yw
88.50.jj
88.50.gp
Opis:
Subject matter of this paper deals with issues of the environmental impact of infrasound noise associated with operation of low-power wind turbines. It is now the current and relevant problem for both the cognitive and utilitarian standpoint. There is now a considerable growth in the number of such installations in Poland, Europe and in the world, due to the possibility of locating them on existing building roofs in heavily urbanized areas, and without having to build additional supporting structures. As part of the study, measurements of low frequency acoustic signals generated during operation of micro turbine equipped with a rotor of vertical axis of rotation relative to the wind direction have been performed. Analyses were carried out in order to determine the impact of wind speed and selected meteorological parameters on the level of infrasound signals emitted by the test turbine. In addition, frequency analysis of the recorded signals was performed. Then, the obtained results were subjected to comparative analysis. In summary, the achieved results were referred to the limits of sound pressure intensity level of infrasound signals as specified for the working environment in accordance with the Polish Standard PN-Z-01338.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 542-545
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System ekspertowy oceny stanu układów izolacyjnych transformatorów elektroenergetycznych z wykorzystaniem metody emisji akustycznej
Expert system for assessment of electric power transformer insulation systems using the acoustic emission method
Autorzy:
Boczar, T.
Frącz, P.
Powiązania:
https://bibliotekanauki.pl/articles/152181.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
metoda emisji akustycznej
wyładowania elektryczne
wyładowania niezupełne
system ekspercki
wysokonapięciowe systemy izolacyjne
acoustic emission method
electrical discharge
partial discharge
expert system
high-voltage insulation systems
Opis:
Tematyka niniejszego artykułu dotyczy doskonalenia praktycznych zastosowań metody emisji akustycznej (EA) w diagnostyce wysokonapięciowych układów izolacyjnych urządzeń elektroenergetycznych. W szczególności przedstawiono podstawowe założenia oraz opisano poszczególne elementy eksperckiego systemu diagnostycznego wykorzystującego metodę akustyczną do oceny stanu mierzonej izolacji transformatorów energetycznych, wykonywanej podczas ich normalnej pracy w warunkach przemysłowych.
The subject matter of this paper refers to the development of practical applications of the acoustic emission (EA) method to diagnostics of high-voltage insulation systems of power appliances, carried out during their regular operation in industrial conditions. First of all, basic assumptions are presented and the particular elements of the expert diagnostic system using AE method for the assessment of the condition of the electric power transformer insulation measured are described. Fig. 1 shows its block diagram in which the following modules can be distinguished: a measuring system (Figs. 2 and 3), a processing - analysing system, a knowledge base and a classifier. These modules are characterised successively in Section 2 of the paper. Special attention is given to the description of the group of multiparametric descriptors (Fig. 4) characterising the AE signals in the time, frequency and time-frequency domains, including descriptive statistics indexes and correlative parameters. Accordant descriptors make it possible, under strictly defined metrological conditions, to recognize basic partial discharge forms (PDs) that may occur in paper-oil insulation. In this way a catalogued knowledge base containing the so-called 'fingerprints' was created for basic types of high-voltage defects of insulation systems. The scope of the research work carried out in the Institute of Power Engineering, connected with a practical implementation of the system suggested, is characterised in the last section of the paper.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 2, 2; 104-107
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
System monitorowania elektrowni wiatrowych z wykorzystaniem technologii webowych
System for monitoring of wind power plants using web technologies
Autorzy:
Boczar, T.
Szmechta, M.
Szczyrba, T.
Powiązania:
https://bibliotekanauki.pl/articles/377119.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
elektrownia wiatrowa
nadzór on-line elektrowni wiatrowej
technologie webowe
WindMon
Opis:
Tematyka, jaka została podjęta w niniejszym artykule, dotyczy doskonalenia systemów komputerowych umożliwiających prowadzenie nadzoru on-line pracujących elektrowni wiatrowych, co w konsekwencji może przyczynić się do zwiększenia niezawodności ich pracy, wydłużenia okresów między kolejnymi przeglądami serwisowymi poprzez zdalną diagnostykę, wyeliminuje nieplanowane i długotrwałe przestoje wynikające z awarii układów sterujących oraz zespołów przetwarzających siłę wiatru w energię elektryczną. Ponadto na podstawie wyników analizy wartości parametrów charakteryzujących pracę instalacji wiatrowych oraz ich korelacji z warunkami atmosferycznymi będzie istniała możliwość zoptymalizowania algorytmów sterowania w celu zwiększenia ich wydajności, co w sposób bezpośredni przyniesie wymierne korzyści finansowe potencjalnym inwestorom i właścicielom elektrowni wiatrowych.
Subject that has been taken in this paper concerns improvement of computer systems to enable on-line supervision of operating wind turbines, what in turn may help to increase the reliability of their work, will extend the intervals between servicing inspections through remote diagnostics, will eliminate unplanned and long-term downtimes arising from failures of the control systems and units converting the wind power into electricity. Moreover, based on the analysis results of parameters characterizing operation of wind power installations and their correlation with the atmospheric conditions, it will be possible to optimize the control algorithms in order to enhance their efficiency, what will bring directly measurable financial benefits to potential investors and owners of wind turbines.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 74; 211-218
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technical Possibilities of Reducing the Sound Pressure Level Emitted into the Environment by a Power Transformer
Autorzy:
Borucki, S.
Boczar, T.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/177473.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power transformer
corrected sound pressure level
noise
modernization
Opis:
The subject presented in this paper refers to measurements and assessment of the corrected sound pressure level values (noise) occurring around a medium-power transformer. The paper presents the values of noise accompanying the operation of the power object before and after its modernization, which consisted in repeated core pressing and replacement of the cooling system. The main aim of the research work was the assessment of the influence of the repair work on the noise level emitted into the environment.
Źródło:
Archives of Acoustics; 2011, 36, 1; 49-56
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Analysis of Mechanical Vibrations and Acoustic Pressure Level οf a Transformer Model
Autorzy:
Boczar, T.
Borucki, S.
Cichon, A.
Lorenc, M.
Powiązania:
https://bibliotekanauki.pl/articles/1811534.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.58.Wc
43.58.Fm
Opis:
The paper presents the results of vibroacoustic investigations and the measurements of the acoustic pressure level (noise) of a transformer model. The measurements were taken at a full transformer load in two operation conditions: at a producer packeted core and at unpacketed core. Unpacketing consisted in loosing the screws pressing the particular core plates. Mechanical vibrations were registered and the acoustic pressure level was measured. The vibroacoustic analysis results are presented in the form of frequency spectra and the results of the acoustic analysis of the transformer under study are shown by determining corrected values of the acoustic pressure level and by a frequency analysis.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-21-A-26
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Application of the Correlative Analysis and the Regression Function for Determining Correlations οf the Measurement Results of Acoustic Emission Generated by Partial Discharges
Autorzy:
Boczar, T.
Frącz, P.
Powiązania:
https://bibliotekanauki.pl/articles/1795789.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.58.-e
43.60.-c
43.60.Bf
Opis:
The subject matter of this paper is connected with development of the assessment methods of results obtained at measurements of partial discharges occurring in insulation systems of power transformers using the acoustic emission method. The paper presents the results connected with determining correlation between partial discharge generation voltage and selected descriptors characterizing the emitted signals of acoustic emission in the frequency domain. Authors use the selected descriptors as comparative criteria for recognition of the basic partial discharge forms that may occur in paper-oil insulation of power transformers. The correlation coefficient and regression function were used to determine the correlation degree between the variables under study.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 281-284
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Critical Evaluation of the Vibroacoustic Criteria Used in Poland to Diagnose of Power Transformer Cores
Autorzy:
Borucki, S.
Cichon, A.
Boczar, T.
Zmarzly, D.
Powiązania:
https://bibliotekanauki.pl/articles/1399335.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The subject matter of this article concerns the diagnostic test results of transformer cores by measuring and analysing vibroacoustic signals registered during their normal operation. The main objective of this research study conducted by the authors, the results of which are published in this paper, is a critical analysis of vibroacoustic criteria, which are adopted in Poland nowadays, and based on which, the assessment of the core technical condition is performed. This article presents exemplary results that were obtained on two twin units of type TET 8509 with a power of 40 MVA. The paper specifies diagnosed structures, the measurement system applied, and the currently used methodology to assess the degree of core loosening. To determine the efficacy and assessment accuracy of the applied vibroacoustic criteria, correlation between mechanical vibration measurements of the tested transformer tanks and results obtained by gas chromatography was performed.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 391-394
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of ultrasound signal parameters on sonoluminescence light intensity
Autorzy:
Szmechta, M.
Boczar, T.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/140426.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
diagnostics of insulating oils
sonoluminescence phenomenon
acoustic cavitation
ultrasound signal
acoustic emission Signac
Opis:
Topics of this article concern the study of the fundamental nature of the sonoluminescence phenomenon occurring in liquids. At the Institute of Electrical Power Engineering at Opole University of Technology the interest in that phenomenon known as secondary phenomenon of cavitation caused by ultrasound became the genesis of a research project concerning acoustic cavitation in mineral insulation oils in which a number of additional experiments performed in the laboratory aimed to determine the influence of a number of acoustic parameters on the process of the studied phenomenona. The main purpose of scientific research subject undertaken was to determine the relationship between the generation of partial discharges in high-voltage power transformer insulation systems, the issue of gas bubbles in transformer oils and the generated acoustic emission signals. It should be noted that currently in the standard approach, the phenomenon of generation of acoustic waves accompanying the occurrence of partial discharges is generally treated as a secondary phenomenon, but it can also be a source of many other related phenomena. Based on our review of the literature data on those referred subjects taken, it must be noted, that this problem has not been clearly resolved, and the description of the relationship between these phenomena is still an open question. This study doesn’t prove all in line with the objective of the study, but can be an inspiration for new research project in the future in this topic. Solution of this problem could be a step forward in the diagnostics of insulation systems for electrical Power devices based on non-invasive acoustic emission method.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 605-612
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of 3D Modeling in the Diagnosis of Power Capacitors with Acoustic Emission Method
Autorzy:
Boczar, T.
Błachowicz, A.
Borucki, S.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/1417933.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.Le
07.05.Tp
Opis:
The article presents the issue modelling the partial discharge phenomenon in engineering and scientific environments using hardware-based computer cluster. The authors present the results of research work on the phenomenon of acoustic emission from partial discharge occurring in power capacitors for power factor correction. The work includes the issues presentation and explanation of solutions enabling to create 3D spatial model of power capacitor. The authors proposed a simplified model of an acoustic test object aimed at improving the process of calculating the results.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 796-799
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Wavelet Analysis of the Vibroacoustic Signal Measurement in a Transient State Operation of Power Transformer
Autorzy:
Borucki, S.
Cichon, A.
Boczar, T.
Zmarzly, D.
Powiązania:
https://bibliotekanauki.pl/articles/1417934.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The article presents the results of attempts made to develop a non-invasive diagnostic method of a technical state of a transformer's core based on an analysis of mechanical vibrations registered during the start-up of the transformer analyzed. The paper presents a characteristic of the transformer under study, the measuring systems applied and the method developed for assessing the degree of the core loosening. The original results presented in the paper have been obtained under laboratory conditions during tests conducted on an oil transformer of 200 kVA. The analysis of recorded virboacoustic signals was performed by means of discrete wavelet transform for three different operating cases: the transformer with no core defect, the transformer with loose screws of the magnetic circuit of the upper yoke, and the transformer with completely loosen screws of the beam of the upper yoke and the lower core. The signals have been recorded on two perpendicular measuring axes: 0X and 0Y and their measured values were subject to the wavelet analysis.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 800-803
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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