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Wyświetlanie 1-15 z 17
Tytuł:
Reduction of magnetic field from a power line using a passive loop conductor
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/97443.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
overhead power line
earth return
passive loop
Opis:
The study presents in a tutorial manner methods of the calculation of magnetic fields in vicinity of overhead electric power lines without and with mitigation loops. Exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique are presented. The decomposition of the magnetic fields in two components: magnetic field obtained in free space from the Biot-Savart law and the magnetic field produced by earth current is discussed. It is shown that in practical cases the effects from earth currents can be neglected as compared with effects from line currents. Moreover the mitigation effects due to the passive loop are also investigated, whereas the mitigation loop can be treated as a rectangular loop (two-conductor closed mitigation loop) located near the power line horizontal or non-parallel to the earth surface.
Źródło:
Computer Applications in Electrical Engineering; 2013, 11; 46-63
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling magnetic field in the vicinity of single wire helix
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/97738.pdf
Data publikacji:
2011
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic wire helix
analytical-numerical method
Biot-Savart law
Opis:
Transmission of the electric power is accompanied with generation of low - frequency electromagnetic fields. Electromagnetic compatibility studies require that the fields from sources of electric power be well known. Many of these sources are not defined to the desired degree of accuracy. This applies e.g. to the case of helical current conductors of finite length. The paper presents an analytical-numerical method of the calculation of the 3D magnetic fields in vicinity of conductors having helical structure. The method is based on the Biot-Savart law and a software tool to model the magnetic fields generated by e.g. twisted wires, helical coils, etc can use the formulas obtained.
Źródło:
Computer Applications in Electrical Engineering; 2011, 9; 69-77
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power line magnetic field mitigation using a passive loop conductor
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376311.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
magnetic field
electric field
electric power lines
Fourier transform
loop conductor
Opis:
The paper presents in a tutorial manner methods of the calculation of magnetic fields in vicinity of overhead electric power lines without and with passive mitigation loops. Exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique are presented. The mitigation effects due to the passive loop are also investigated, whereas the mitigation loop can be treated as a rectangular loop (two-conductor closed mitigation loop) horizontal located under the power line. The decomposition of the magnetic fields in two components: magnetic field obtained in free space from the Biot-Savart law and the magnetic field produced by earth current shows that in practical cases the effects from earth currents can be neglected as compared with effects from line currents.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 137-145
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer modelling of lighting power controller operation disturbed by 1.2/50 μs voltage lightning stroke
Autorzy:
Typańska, D.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376687.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
surge impulse
computer simulations
lighting installation
power regulator
Opis:
The article presents a computer simulation of a lighting installation disturbed by lightning surge. Modelled impulse voltage generator 1.2/50 μs, system with coupling/ decoupling system and a power semiconductor regulator used in light engineering have been described. The aim of the work was to investigate the influence of the surge impulse on the current flowing through the installation.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 93; 159-168
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromagnetic compatibility of smart installations
Autorzy:
Typańska, D.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376224.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electromagnetic compatibility
intelligent building
electromagnetic disturbances
KNX
smart installations
Opis:
The paper presents the problem of protection of smart houses against electromagnetic disturbances. The technology associated with intelligent buildings was explained in detail. Attention was drawn to possibility of using specific technologies installed in different places. Electromagnetic disturbances that may affect the operation of sensitive electronic of intelligent building were characterized. The spread way of these disturbances and their methods of reduction were described.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 81; 95-100
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mutual inductance of finite length twisted-wire pair
Impedancja wzajemna skrętki jednoparowej o skończonej długości
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/376721.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
twisted-wire pair
mutual inductance
Neumann’s formula
Opis:
Twisting of a bifilar lead is commonly used in various fields of electrical instruments and measurement systems in order to reduce the electromagnetic interference (EMI). Knowledge of inductances for helical conductors is needed for fundamental electromagnetic calculations, e.g. in electromagnetic compatibility studies. In the paper, a calculation method based on the Neumann’s formula is applied for the mutual inductance calculation of a twisted-wire pair of finite length. The exemplary calculation is also presented.
Skrętka jednoparowa jest zwykle wykorzystywana w różnego rodzaju urządzeniach elektrycznych i elektronicznych systemach pomiarowych w celu redukcji niekorzystnych sprzężeń elektromagnetycznych. Impedancja wzajemna skrętki jednoparowej (układu dwóch wzajemnie skręconych przewodów o kształcie helisy) jest podstawową wielkością wykorzystywaną w obliczeniach np. z zakresu kompatybilności elektromagnetycznej. W pracy do wyznaczenia impedancji wzajemnej skrętki jednoparowej o skończonej długości wykorzystano wzór Neumanna. Zaprezentowano przykład obliczeniowy.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 143-147
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electromotive force induced in a loop conductor under a power line conductor
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/378317.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
electromotive force
loop conductor
overhead power line
earth return
Opis:
The study presents methods of the calculation of electromotive force (emf) induced in a mitigation loop located under an overhead power line conductor. The loop can be treated as a rectangular loop (two-conductor closed mitigation loop) located near the power line horizontal to the earth surface. Exact and simplified methods of the determination of the emf are presented. The exact method bases on the earth return circuit theory, whereas the simplified method allows one to calculate the induced emf under the assumption neglecting earth currents.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2014, 77; 85-92
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inductances of coaxial helical conductors
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/97740.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
helical conductor
Neumann’s formula
Opis:
Twisting of conductors is commonly used in various fields of electrical instruments and measurement systems in order to reduce the electromagnetic interference (EMI). Knowledge of inductances for helical conductors is needed for fundamental electromagnetic calculations, e.g. in electromagnetic compatibility studies. In the paper, a calculation method based on the Neumann’s formula is applied for the inductance calculation of coaxial helical conductors of finite length. The exemplary calculations are also presented.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 358-371
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic field of complex helical conductors
Autorzy:
Budnik, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/141527.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Biot-Savart law
magnetic flux density
helical line
Opis:
Transmission of the electric power is accompanied with generation of low –frequency electromagnetic fields. Electromagnetic compatibility studies require that the fields from sources of electric power be well known. Unfortunately, many of these sources are not defined to the desired degree of accuracy. This applies e.g. to the case of the twisted-wire pair used in telephone communication; already practiced is twisting of insulated high-voltage three phase power cables and single-phase distribution cables as well. The paper presents a theoretical study of the calculation of magnetic fields in vicinity of conductors having helical structure. For the helical conductor with finite length the method is based on the Biot-Savart law. Since the lay-out of the cables is much more similar to a broken line than to strait line, in the paper the magnetic flux densities produced by helical conductor of complex geometry are also derived. The analytical formulas for calculating the 3D magnetic field can be used by a software tool to model the magnetic fields generated by e.g. twisted wires, helical coils, etc.
Źródło:
Archives of Electrical Engineering; 2013, 62, 4; 533-540
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of electric and magnetic field intensities in proximity of power lines using genetic and particle swarm algorithms
Autorzy:
Król, K.
Machczyński, W.
Powiązania:
https://bibliotekanauki.pl/articles/141588.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power line
electric field
magnetic field
optimization
genetic algorithm
particle swarm algorithm
Opis:
The paper presents optimization of power line geometrical parameters aimed to reduce the intensity of the electric field and magnetic field intensity under an overhead power line with the use of a genetic algorithm (AG) and particle swarm optimization (PSO). The variation of charge distribution along the conductors as well as the sag of the overhead line and induced currents in earth wires were taken into account. The conductor sag was approximated by a chain curve. The charge simulation method (CSM) and the method of images were used in the simulations of an electric field, while a magnetic field were calculated using the Biot–Savart law. Sample calculations in a three-dimensional system were made for a 220 kV single – circuit power line. A comparison of the used optimization algorithms was made.
Źródło:
Archives of Electrical Engineering; 2018, 67, 4; 829-843
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power line induced electric field and electromotive force in a nearby overhead circuit
Autorzy:
Budnik, K.
Machczyński, W.
Szymenderski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97415.pdf
Data publikacji:
2014
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
overhead power line
earth return
induced electric field
loop conductor
electromotive force
Opis:
The study presents methods of the calculation of electric field induced in vicinity of an overhead current carrying conductor. Exact method of the determination of the induced electric field bases on the Fourier transform technique, whereas a simplified method uses the concept of complex ground return plane. Exact and simplified methods of the calculation of electromotive force (emf) induced in a loop located under an overhead power line conductor are also presented. The loop is treated as a rectangular loop (two-conductor closed loop) located near the power line horizontal to the earth surface. The exact method bases on the earth return circuit theory, whereas the simplified method allows one to calculate the induced emf under the assumption neglecting earth currents. The methods presented are illustrated by exemplary calculations.
Źródło:
Computer Applications in Electrical Engineering; 2014, 12; 45-56
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical effects of stray currents from d.c. traction of complex geometry
Autorzy:
Budnik, K.
Machczyński, W.
Szymenderski, J.
Powiązania:
https://bibliotekanauki.pl/articles/97580.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
stray currents
d.c. traction
complex geometry
earth return circuit
simulation
Opis:
The paper presents a method of the simulation of electrical effects of stray currents from d.c. tracrion of complex geometry. In the method the equivalent rail is considered as an earth return circuit. The models of the equivalent rail with current energization and the concept of superposition allow one to consider more complicated d.c. railway systems using a segmental approximation of the complex railway route and taking into account a number of substations and loads at any location. It is assumed in the paper that the system considered is linear, that the earth is homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents area, is illustrated by examples of computer simulation.
Źródło:
Computer Applications in Electrical Engineering; 2016, 14; 39-52
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Polarization phenomenon in underground pipeline generated by stochastic stray currents from D.C. traction
Autorzy:
Budnik, K.
Machczyński, W.
Szymenderski, J.
Powiązania:
https://bibliotekanauki.pl/articles/377528.pdf
Data publikacji:
2017
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
stochastic stray currents
D.C. traction
earth return circuit
earth scalar potential
simulation
polarization phenomenon
Opis:
D.C electrified traction systems are a potential source of stray currents. The important problem, technically, is to evaluate the harmful effects (electrolytic corrosion) that an electrified railway has on nearby earth–return circuits (e.g. pipelines). This phenomenon is stochastic and may aggravate electrochemical corrosion in different places depending on the position of the vehicle, the load current, soil parameters, etc. The electric circuit approach, based on the complete field method of solution of the transmission–line problem (the earth–return circuit theory), to model stray currents interference on extended structures is presented. The electrode kinetics (polarization phenomenon) is taken into account in the model developed. Random algorithm allows to explore the phenomenon of polarization for different cases, which allows for generalization of the conclusions regarding the risk of corrosion in the studied systems.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 89; 111-122
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of traction stray currents interaction with the earth return circuits
Autorzy:
Budnik, K.
Machczyński, W.
Szymenderski, J.
Powiązania:
https://bibliotekanauki.pl/articles/377830.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
stray currents
earth return circuits
interaction
simulation
Opis:
The paper presents methods for analyzing the impact of stray currents generated by DC electric traction on nearby earth-return circuits (pipelines). Various simulation models were developed and compared. First the current and potential of the rail were determined using two models. A model with distributed parameters and a model with lumped parameters consisting of chain-connected two-ports of the π type, for which the potential values in the nodes and currents in the branches were determined using the node potential method. The results obtained were used to further analyze the interaction between the railway rail and the pipeline. The pipeline model is presented in the form of a chain connection of π type two-ports. To determine the impact of stray currents on the pipeline, an analysis of the electric field in its vicinity was carried out. For this purpose, two methods have been developed. First, the analysis of the distribution of the scalar potential in the ground for a rail section of finite length was performed. Second method required taking into account the mutual conductivity of the two circuits (rail and pipeline), which in connection with the knowledge of the leakage current from the rail made it possible to determine the potential of the tested pipeline (using controlled voltage sources). The paper presents the implementation of methods and a comparison of the results obtained. The usefulness and applicability of the developed models for the analysis of the impact of stray currents from DC electric traction on earth-return circuits were also assessed.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 93; 227-239
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simulation of stray currents generated by DC electric traction
Autorzy:
Budnik, K.
Machczyński, W.
Szymenderski, J.
Powiązania:
https://bibliotekanauki.pl/articles/378349.pdf
Data publikacji:
2015
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
stray currents
d.c. traction
earth return circuit
earth scalar potential
simulation
Opis:
The paper presents two methods of the 3D simulation of the primary scalar potential of the electric flow field produced in the earth by d.c. traction stray currents. In the first method the equivalent rail is considered as an earth return circuit with distributed parameters, whereas in the second method the rail is treated as a circuit with lumped parameters. It is assumed in the paper that the system considered is linear, that the earth is homogeneous medium of finite conductivity and that the effects of currents in nearby underground metal installations on the potential generated in the earth by track currents (primary earth potential) can be disregarded. An extensive parametric analysis to examine the roles of various factors, which affect the primary earth potential caused by stray currents, may be performed using simulation program developed. The technical application of the method presented, which can be useful at design stage e.g. of metal structures buried in the stray currents
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 67-76
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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