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Wyświetlanie 1-15 z 33
Tytuł:
Current density in the unscreened three-phase high-current busduct
Autorzy:
Szczegielniak, T.
Piątek, Z.
Kusiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97582.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
analytical method
high-current busduct
current density
Opis:
Design of the high-current busducts on high currents and voltages causes necessity precise describing of electromagnetic, dynamic and thermal effects. Knowledge of the relations between electrodynamics and constructional parameters is necessary in the optimization construction process of the high-current busducts. Information about distribution electromagnetic field is a base into analysis of electrodynamics and thermal effects in the high-current busducts. The paper presents analytical calculations of the current density in the three-phase high-current busduct which phase conductors are placed in vertex of a square. Into account were taken skin and proximity effect. The electromagnetic field produced by high-current busducts are usually calculated numerically with the use of a computer. However, the analytical calculation of the electromagnetic field is preferable, because it results in a mathematical expression for showing its dependences on various parameters of the line arrangement.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 57-64
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The power electronics controlled current source utilized in the reference current generator
Autorzy:
Gwóźdź, M.
Powiązania:
https://bibliotekanauki.pl/articles/377579.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
power electronics
current controlled voltage source
current generator
Opis:
The paper considers wide-band voltage controlled power electronics current source. The current source has been designed as a part of 1-channel reference current generator designed for current meters testing. The control module of the generator utilizes specialized Analog Devices Inc. DSPs based microcomputer module for power electronics applications. Used solutions have allowed obtain high quality referencing of the output current within reference signal. The paper presents the structure and selected aspects of the control algorithm of the current source. Also selected investigations results of laboratory prototype of generator with utilization of controlled current source are presented.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 9-14
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verification of the value of leakage current amperage of a rod insulator surface determined using an electric model of its surface percolation
Autorzy:
Frączak, P.
Powiązania:
https://bibliotekanauki.pl/articles/97353.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
insulator percolation current amperage
insulator percolation current amperage verification
Opis:
This work presents simulation of calculations related to the value of leakage current amperage on a porcelain surface of a rod insulator performed using the percolation theory. Surface of a rod insulator has been presented in the percolation model for grid nodes. This model is an electric circuit which includes a resistance grid and a power (voltage) source. This model includes a randomised method of “filled” node creation within the grid. The procedure of simulation calculations of the leakage current amperage using the percolation model included creation of its equivalent circuit and declaration of appropriate current analysis in the PSpice program. Thus obtained values of leakage current on amperage the surface of a rod insulator were compared with values measured on insulators studied at the testing station. Similar values of leakage current amperage on surfaces of insulators were obtained in simulation calculations (for the percolation theory), and in actual measurements at the testing station.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 201-209
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Probabilistic assessment of the short-circuit duration on the 220 kV transmission line basing on simulation analysis
Autorzy:
Frąckowiak, R.
Piechocki, P.
Powiązania:
https://bibliotekanauki.pl/articles/97379.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
transmission lines
current
simulation analysis
Opis:
In the paper, the problem of defining the short circuit duration time for the short-circuit effect calculations, especially thermal and electromagnetic ones, has been discussed. In author’s opinion, the results of probabilistic research could be helpful when resolving the problem. Therefore, a tailored simulation model based on the analysis of the protections and circuit breakers operation during the transmission lines fault clearance has been developed. Due to the results of simulation study, the found values of the fault duration time could be related to the expected risk of their exceeding depending on both the protection system configuration and the type of the circuit breakers applied.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 275-282
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Illustration of the elliptical field in the screened flat 3-phase high current busduct
Autorzy:
Kusiak, D.
Piątek, Z.
Szczegielniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/97732.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high-current busduct
magnetic fields
Opis:
The paper demonstrates the elliptical magnetic field in the flat 3-phase high current screened busduct in the context of the both the external and internal proximity effect. The modules and the amplitudes of the complex components of the magnetic field strength in the high-current busducts of this type are the functions of the two variables: r and Ѳ of the cylindrical coordinate system which subsequently provokes to the conclusion that the harmonic magnetic field in shielded high-current busducts is a rotating elliptical field. For the characterisation of complex vector values for this field, it is suggested that the length of the longer semi axis of an ellipse as showed at the end of the vector within one period should be used. The article presents the elliptic magnetic field in the screen, and the internal and external area of the screen of the flat 3-phase high current busduct.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 80-97
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic field around the screened three-phase high-current busducts
Autorzy:
Szczegielniak, T.
Piątek, T.
Kusiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97254.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high current busduct
magnetic field
FEMM
Opis:
This paper presents an analytical method for determining the magnetic field in the three–phase gas–insulated transmission line (i.e., high-current busduct) of circular cross–section geometry. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). Apart from analytical calculation, computer simulations for high-current busduct system magnetic field were also performed with the aid of the commercial FEMM software, using two–dimensional finite elements.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 14-24
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of induction motor bearing diagnostic test results through vibration and stator current measurement
Autorzy:
Ciszewski, T.
Swędrowski, L.
Powiązania:
https://bibliotekanauki.pl/articles/97654.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
induction motor
rotor
stator
stator current
Opis:
The paper discusses results of tests performed by authors, related to the engine bearings diagnostic using vibration and stator current measurements. Vibration methods for bearing diagnostics have one disadvantage - they require the availability of the machine for sensors installation. This is the reason for seeking new methods based on motor supply current analysis. It can be assumed that each bearing defect causes radial movement between the rotor and stator of the machine. These changes generate additional stator current harmonics. The paper contains the description of an automatic measurement system, developed for the measurement of those harmonics and processing that data to obtain bearing diagnostic information. System was tested on objects with intentionally made defects in bearings, results of this test was also shown in the paper.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 165-170
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the power losses in the three-phase high-current busducts
Autorzy:
Szczegielniak, T.
Piątek, Z.
Kusiak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97329.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high-current busduct
power losses
electromagnetic field
Opis:
This paper presents an analytical method for determining the power losses in the three-phase gas-insulated transmission line (i.e., high-current busduct) of circular cross-section geometry. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). Apart from analytical calculation, computer simulations for high-current busduct system power losses were also performed with the aid of the commercial FEMM software, using two-dimensional finite elements.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 21-27
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reverse reaction magnetic field in two-wire high current busduct
Autorzy:
Piatek, Z.
Kusiak, D.
Szczegielniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/97489.pdf
Data publikacji:
2010
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
high-current busduct
elliptical field
Opis:
Work has shown how a reverse reaction magnetic field influences the whole magnetic field within the conductor and its vicinity. A description of this is presented in formulae for relative field values and parameters taking into account frequency, conductivity and diameter of the conductor. This has shown the field to be an elliptical field.
Źródło:
Computer Applications in Electrical Engineering; 2010, 8; 53-60
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power losses in the three-phase gas-insulated line
Autorzy:
Szczegielniak, T.
Kusiak, D.
Piątek, Z.
Powiązania:
https://bibliotekanauki.pl/articles/376150.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
high-current busduct
electromagnetic field
power losses
Opis:
This paper presents an analytical method for determining the power losses in the three–phase gas–insulated line (i.e., high-current busduct) of circular cross–section geometry which phase conductors are placed in vertex of a square. The mathematical model takes into account the skin effect and the proximity effects, as well as the complete electromagnetic coupling between phase conductors and enclosures (i.e., screens). The power losses produced by high-current busducts are usually calculated numerically with the use of a computer. However, the analytical calculation of the power losses is preferable, because it results in a mathematical expression for showing its dependences on various parameters of the line arrangement. Moreover, knowledge of the relations between electrodynamics and constructional parameters is necessary in the optimization construction process of the high-current busducts.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 89; 89-98
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of the magnetic field of the three-phase 4-conductor line with rectangular busbars
Autorzy:
Kusiak, D.
Piątek, Z.
Szczegielniak, T.
Jabłoński, P.
Powiązania:
https://bibliotekanauki.pl/articles/1395763.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
rectangular busbar
high-current busduct
Opis:
The paper presents the results of the calculations of the magnetic field for the both shielded and non-shielded 3-phase MR 250 busbar manufactured by Elektromontaż 2 in Katowice, Poland. The busbar magnetic field has been determined by the following methods: analytical method for non–shielded busbar without taking into account the skin and proximity effects, analytical–numerical method based on integral equations, two-dimensional method of finite elements with the use of the commercial FEMM software, measurement method on a test stand. The measurements were performed with the use of a special non-directional magnetic field meter. A satisfactory compliance of the calculations has been obtained.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 25-38
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspect of the elliptical field in the screened flat three-phase high current busduct. Part I - In the internal area of the screen
Aspekt pola eliptycznego w ekranowanym płaskim trójfazowym torze wielkoprądowym. Część I - W obszarze wewnętrznym ekranu
Autorzy:
Kusiak, D.
Piątek, Z.
Szczegielniak, T.
Powiązania:
https://bibliotekanauki.pl/articles/376450.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
elliptical field
screened flat three-phase high current busduct
high current busduct
external proximity effect
internal proximity effect
Opis:
The paper shown the elliptical magnetic field in the high current screened busduct in the case of the both the external and internal proximity effect. For the characterisation of complex vector values for such a field it is proposed that the length of the longer ellipse semi axis as indicated by the end of the vector within one period be used. Part I describes of elliptic field in the internal area of the screen of the flat three-phase high current busduct.
W artykule przedstawiono eliptyczne pole magnetyczne występujące w ekranowanym torze wielkoprądowym w przypadku zewnętrznego i wewnętrznego zjawiska zbliżenia. Do charakteryzowania wartości zespolonego wektora takiego pola zaproponowano długość dłuższej półosi elipsy jaką zakreśla koniec tego wektora w ciągu jednego okresu. Część I opisuje pole eliptyczne w obszarze wewnętrznym ekranu trójfazowego płaskiego toru wielkoprądowego.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 127-134
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of macroscopic eddy current losses in ferromagnetic materials considering hysteresis loop
Autorzy:
Bereźnicki, M.
Jabłoński, P.
Powiązania:
https://bibliotekanauki.pl/articles/378369.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
eddy current power losses
magnetic hysteresis
magnetic nonlinearity
Opis:
The paper presents an algorithm for calculation of eddy current power losses caused by macroscopic eddy currents in ferromagnetic materials considering non-linearity of magnetization characteristics and magnetic hysteresis. The results of calculations are presented for a typical non-oriented steel sheet with silicon content of 6.5%. It has been found that inclusion of hysteresis loop and non-linearity of magnetization for the analyzed material has little effect on the calculated eddy current losses. Restrictions on the use of the algorithm are primarily due to the assumption of average values of the flux in the cross section of the sample, numerical problems when converting B → H and H → B for large increases in the induction, and the lack of regularity of the shape of the hysteresis loop measurements.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 93; 205-214
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Current State Map and Reorganization of Production for Example Real Factory
Autorzy:
Gola, Ł
Szewczyk, W
Powiązania:
https://bibliotekanauki.pl/articles/409361.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
reorganization
current state map
value stream mapping (VSM)
Opis:
The paper presents an example of building the Current State Map and a proposal for the reorganization of production process in a INVENTOR factory. The tool that has enabled realization the improvement of the production process was Value Stream Mapping. Collected a lot of information about the production process. The basis of the reorganization is to analyze the current situation of production and the conclusions of this analysis. Also the paper presents a comparative analysis of selected process parameters before and after the reorganization.
Źródło:
Research in Logistics & Production; 2015, 5, 4; 371-379
2083-4942
2083-4950
Pojawia się w:
Research in Logistics & Production
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remote current measurement with FPGA digital processing
Autorzy:
Smyk, R.
Czyżak, M.
Powiązania:
https://bibliotekanauki.pl/articles/97634.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
mains supply control
current measurement
FPGA
ZigBee standard
Opis:
The work presents an implementation of a modular measurement and control system that controls variants of mains supply of 230V electrical equipment. The system allows to supervise power consumption in the office electronic equipment. The system detects the instant of the reduced power consumption by a device and makes possible its switch-off in order to reduce energy cost. The current is measured with integrated current/voltage converters. The customized hardware has been built for the distributed acquisition system that includes: the data sending module with wireless transmission using ZigBee standard between the measurement point and monitoring point and switching devices. The measurement module was implemented using Altera FPGA.
Źródło:
Computer Applications in Electrical Engineering; 2015, 13; 310-318
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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