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1
Modelowanie oddziaływania zaburzeń HPM na obiekty IK
Słobodzian Piotr
Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
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2022
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nr 4
583--586
PL
W artykule opisano ogólne zasady modelowania oddziaływania zaburzeń HPM na obiekty infrastruktury krytycznej (IK). Scharakteryzowano znane narzędzia wykorzystywane do modelowania skutków oddziaływania HPM. Następnie omówiono elementy modelowania występujące na pierwszym i drugim poziomie tzw. piramidy modelowania i symulacji skutków oddziaływania HPM.
EN
This paper describes the general principles of modeling the impact of HPM disturbances on objects of the critical infrastructure (IC objects). Current tools used to model the effects of HPM have been characterized. Then, the elements of modeling that belong to the first and second levels of the so-called modeling and simulation pyramids of the HPM impact have been discussed.
2
Modelowanie i pomiary pola oświetlającego obiekty IK w paśmie mikrofalowym
Bieńkowski Paweł, Słobodzian Piotr, Sobkiewicz Przemysław, Zubrzak Bartłomiej
Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne
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2022
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nr 4
591--594
PL
W pracy opisano ogólne zasady modelowania oświetlenia obiektów infrastruktury krytycznej (IK) przez źródła zaburzeń HPM. Opracowany model oświetlenia obiektu jest podstawowym elementem wszystkich ścieżek oddziaływania zaburzenia HPM na obiekt. W artykule przedstawiono również przykład eksperymentalnej weryfikacji opracowanego modelu.
EN
This paper describes general principles for modeling the incident field on objects of critical infrastructure (CI) that is generated by HPM disturbance sources. The developed model is a basic element of all paths of HPM disturbance impact on an CI object. The paper also presents an example of experimental verification of the model.
3
Content available Self and mutual capacitance of conductors in air and lossy earth with application to electrified railways
Mariscotti Andrea
Archives of Electrical Engineering
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2019
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Vol. 68, nr 4
859--873
EN
The problem of a closed-form accurate determination of self and mutual capacitance of conductors in air and earth is considered: the application is the complete modeling of a railway line including buried conductors. The Generalized Potential Method (GPM) is presented and analyzed with regard to conditions of validity and solution methods. The accuracy of the GPM is evaluated solving some reference cases using the Complex Image Method and a commercial Finite Element Method simulator, comparing the model results with experimental data, and including the sensitivity on soil conductivity and permittivity, distance of conductors from the air–earth interface and frequency.
4
Content available Influence of Chirped DBR Reflector on the Absorption Efficiency of Multi-nanolayer Photovoltaic Structures: Wavelength-scale Analysis by the Method of Single Expression
Baghdasaryan H., Knyazyan T., Hovhannisyan T., Mardoyan G., Marciniak M., Benson T.
Journal of Telecommunications and Information Technology
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2017
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nr 3
99--106
EN
An electromagnetic wavelength-scale analysis of the optical characteristics of multi-nanolayer photovoltaic (PV) structures: without an antireflection coating, with an antireflection coating on the top of the structure, and with both the antireflection coating on the top and a broadband non-periodic (chirped) distributed Bragg reflector (DBR) on the bottom of the structure is performed. All the PV structures studied are based on a Si p-i-n type absorber supported by a metallic layer (Cu) and SiO2 substrate. The top-to-bottom electromagnetic analysis is performed numerically by the method of single expression (MSE). Absorbing and reflecting characteristics of the multi-nanolayer PV structures are obtained. The influence of the thicknesses and permittivities of the layers of the PV structures on the absorbing characteristics of the structures is analyzed to reveal favourable configurations for enhancement of their absorption efficiency. The localizations of the electric component of the optical field and the power flow distribution within all the PV structures considered are obtained to confirm an enhancement of the absorption efficiency in the favorable configuration. The results of the electromagnetic wavelength-scale analysis undertaken will have scientific and practical importance for optimizing the operation of thin-filmmulti-nanolayer PV structures incorporating a chirped DBR reflector with regards to enhancing their efficiency.
5
Content available Nonlinear behavior analysis of split-winding dry-type transformer using a new star model and a coupled field-circuit approach
Azizian D.
Archives of Electrical Engineering
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2016
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Vol. 65, nr 4
773--787
EN
Regarding the importance of short circuit and inrush current simulations in the split-winding transformer, a novel nonlinear equivalent circuit is introduced in this paper for nonlinear simulation of this transformer. The equivalent circuit is extended using the nonlinear inductances. Employing a numerical method, leakage and magnetizing inductances in the split-winding transformer are extracted and the nonlinear model inductances are estimated using these inductances. The introduced model is validated and using this nonlinear model, inrush and short-circuit currents are calculated. It has been seen that the introduced model is valid and suitable for simulations of the split-winding transformer due to various loading conditions. Finally, the effects of nonlinearity of the model inductances are discussed in the following.
6
Content available Corona Modeling for the Transient Analysis, Steady State and Corona Loss Performance of Transmission Lines
Saied M. M.
Electrical Power Quality and Utilisation. Journal
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2013
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Vol. 16, iss. 2
11--20
EN
This paper addresses the steady state analysis and the electromagnetic transients of overhead power transmission lines exhibiting corona. After a brief survey of the currently available modeling techniques, an alternative approach to the simulation of the corona discharge is presented. It is based on adding voltage-dependent current sources at prespecified nodes within the line’s lumped, ladder-shaped, equivalent circuit including an aduqate number of sections. The characteristics of these current sources can be determined using the usually available corona power loss measurements under power frequency sinusoidal voltage conditions. The line model is used for finding its transient response using time domain techniques. Several voltage excitation waveforms and magnitudes as well as different line’s loading conditions are investigated. As a further application of the suggested approach, the minimizion of the total corona losses of a long shunt compensated line will be considered as an additional criterion in the process of identifying the appropriate rating and location of the compensating coil primarily used for improving the line’s voltage profile.
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