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    Wyświetlanie 1-11 z 11
    Tytuł:
    Discharge channel displacement simulation in AC arc
    Autorzy:
    Daszkiewicz, T.
    Tarczyński, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/141374.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    łuk łączeniowy
    łuk prądu przemiennego
    switching arcs
    arc motion velocity
    computer AC arc simulation
    Opis:
    Results of 3-D of discharge channel displacement simulation, acquired by means of the Fluent program during one current half-period of AC arc, indicate that the obtained images of the phenomenon are qualitatively similar to those, recorded with a high-speed digital camera, while the computer simulation enables much a more comprehensive analysis of the acquired data. In addition to selected arc simulation frames and corresponding distributions of mass velocity vectors and current density vectors on a plane, the distributions of temperature, current density and mass velocity values are presented on the axis of the electrode arrangement model. The composite motion (continuous and jumping) of discharge channels was analyzed, taking into account mass displacement and matter state changes.
    Źródło:
    Archives of Electrical Engineering; 2010, 59, 1-2; 35-49
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modified Voronin models of electric arc with disturbed geometric dimensions and increased energy dissipation
    Autorzy:
    Sawicki, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1841375.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric arc
    Mayr model
    Cassie model
    Voronin model
    Opis:
    Mathematical models of electric an arc with disturbed geometric sizes were created based on initial assumptions adopted from the Mayr and Cassie models. Two cases of approximation of arc characteristics were considered separately. The Mayr–Voronin model was created in the low-current range with an exponential dependence of conductance on plasma enthalpy. However, the Cassie–Voronin model created is valid in the high-currentrange with a linear dependence of conductance on plasma enthalpy. In addition, the effect of two different assumptions about the method of energy dissipation, proportional to the lateral surface of the column or proportional to the volume of the column, on the parameters of both mathematical models was compared. It has been shown that under constant geometrical parameter values, created models can be reduced to classic Mayr and Cassie models. Then, these models were modified by taking into account the additional increase in heat dissipationas the current increases. Increasing voltage and current characteristics correspond to suchan arc. Using the computer simulations, the effectiveness of using developed mathematical models in mapping the dynamic characteristics of the electric arc has been shown.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 1; 89-102
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Arc models for simulating processes in circuits with a SF6 circuit breaker
    Autorzy:
    Sawicki, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/140610.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    switching arc
    high-voltage circuit breaker
    Mayr model
    Opis:
    This paper demonstrates that if a linear dependence of arc dissipated power on power supplied is introduced at an initial stage of analysis, then, with some simplifying assumptions, the classical Mayr model is obtained. Similarly, if this dependence is taken into account in a model with residual conductance, the modified Mayr model is obtained. The study takes into consideration the local phenomenon of sudden voltage drop accompanying linear current decrease occurring in the circuit breaker. To account for this phenomenon, the Dirac delta function and its approximation by a Gaussian function, representing power or enthalpy disturbances, are introduced to the power balance equation. It is demonstrated that both variants yield the same effect, leading to identical differential equations. Macromodels of the circuit-breaker arc are created and connected with the power source circuit with lin- early decreasing current. The results obtained were found to be consistent with experimental data available in the literature. The models presented are based on a fairly uncomplicated 1st order differential equation and offer a straightforward physical interpretation of the phenomena in question.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 147-159
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient recovery voltage analysis for various current breaking mathematical models: shunt reactor and capacitor bank de-energization study
    Autorzy:
    Oramus, P.
    Chmielewski, T.
    Kuczek, T.
    Piasecki, W.
    Szewczyk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140943.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arc modelling
    overvoltages studies
    EMTP-ATP program
    transients analysis
    Opis:
    Electric arc is a complex phenomenon occurring during the current interruption process in the power system. Therefore performing digital simulations is often necessary to analyse transient conditions in power system during switching operations. This paper deals with the electric arc modelling and its implementation in simulation software for transient analyses during switching conditions in power system. Cassie, Cassie-Mayr as well as Schwarz-Avdonin equations describing the behaviour of the electric arc during the current interruption process have been implemented in EMTP-ATP simulation software and presented in this paper. The models developed have been used for transient simulations to analyse impact of the particular model and its parameters on Transient Recovery Voltage in different switching scenarios: during shunt reactor switching-off as well as during capacitor bank current switching-off. The selected simulation cases represent typical practical scenarios for inductive and capacitive currents breaking, respectively.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 3; 441-458
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral and integral methods of determining parameters in selected electric arc models with a forced sinusoid current circuit
    Autorzy:
    Sawicki, A.
    Haltof, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/140881.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric arc
    Mayr model
    Cassie model
    Pentegov model
    spectral methods
    integral methods
    Opis:
    The paper discusses problems arising in attempts to accurately represent dynamic processes of an electric arc by means of simple mathematical models. It describes the properties of the universal Pentegov model, employing any shape of static voltagecurrent characteristics of an arc. Next, it presents spectral and integral measuring methods for determining arc parameters in the Mayr, Cassie and Pentegov models of the electric arc with a forced sinusoid current circuit, with the raising static characteristics of hyperbolic-flat and hyperbolic-linear shape. The influence is discussed of the random power supply disturbances on errors of determining the mathematical model parameters.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 1; 87-103
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field-circuit modelling of an advanced welding transformer with two parallel rectifiers
    Autorzy:
    Sakhno, L.
    Sakhno, O.
    Dubitsky, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/141600.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arc welding
    double-bridge rectifier
    leakage inductance
    three-winding transformer
    transformer equivalent circuit
    Opis:
    The new topology of three-winding welding transformer is proposed. Each secondary winding is connected in parallel through the separate bridge rectifier to the welding arc. The main feature of the proposed device is parallel working of two secondary windings with different rated voltage. The advantage is nonlinear transformation ratio of current that provides unprecedented power efficiency. The self- and mutual leakage inductances, which are important in power conversion, are calculated by 2D FEA model. The operational current of the device is modelled numerically via P-Spice simulator. The proposed topology is up to 30% more power effective than conventional welding transformer provided that the leakage inductances of primary and secondary windings are correctly fitted. This transformer is used for manual arc welding.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 2; 249-257
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problems and counter measures of arc suppression coilin 10 kV distribution system
    Autorzy:
    Ni, Hui
    Ding, Pei
    Ma, Yunlong
    Ai, Shaogui
    Ma, Feiyue
    Zhang, Qingping
    Powiązania:
    https://bibliotekanauki.pl/articles/141485.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    arc suppression coil
    capacitive current
    artificial grounding fault test
    neutral non-effective grounding system
    Opis:
    The arc suppression coil determines whether it can effectively extinguish the arc when it is grounded in the neutral non-effective grounding system. An artificial grounding test is an importantway to verify its performance. In this study, 13 substations with the 10 kV system in the Ningxia areawere selected and considered. Based on the artificial single-phase grounding test, the residual current, the compensation current and the off-resonance degree were measured in the arc suppression coil, and the performance of the arc suppression coil in the 10 kV system was verified. The experimental results show that the error of arc suppression coil automatic measurement is large, the off-resonance degree is large, the resistive component in the compensation current is excessive, the harmonic component exists in the compensating current and capacitive current. To solve these problems, this paper puts forward the corresponding countermeasures for reference.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 1; 135-146
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New directions in electric arc furnace modeling
    Autorzy:
    Grabowski, Dariusz
    Klimas, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2202551.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    artificial neural networks
    chaos theory
    electric arc furnace
    fractional calculus
    power balance
    stochastic processes
    Opis:
    This paper presents new directions in the modeling of electric arc furnaces. This work is devoted to an overview of new approaches based on random differential equations, artificial neural networks, chaos theory, and fractional calculus. The foundation of proposed solutions consists of an instantaneous power balance equation related to the electric arc phenomenon. The emphasis is mostly placed on the conclusions that come from a novel interpretation of the equation coefficients.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 1; 157--172
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FEM analysis of magnetic field and forces in area ARC fault of autotransformer HV winding
    Autorzy:
    Koteras, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/141136.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    3D magnetic field analysis
    electrodynamic forces
    mechanical stresses
    electric arc fault in windings
    Opis:
    In this paper the electric arc fault in the high voltage winding turn of the power autotransformer has been investigated. 3D magnetic field distributions in the leakage domain and electrodynamic forces acting on high voltage winding have been calculated. Finite Element Method was used for the magnetic flux density simulation. The elctrodynamic force value under the fault exceed significantly the nominal mechanical stresses of the winding.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 4; 601-608
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electric arc models with non-zero residual conductance and with increased energy dissipation
    Autorzy:
    Sawicki, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1955184.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cassie model
    electric arc
    hybrid model
    Mayr model
    model Cassiego
    łuk elektryczny
    model hybrydowy
    model Mayr
    Opis:
    This paper describes modifications of the Mayr and Cassie models of the electric arc. They include the phenomena of increased heat dissipation and non-zero residual conductance when the current passes through zero. The modified models are combined into a new hybrid model connecting them in parallel and activated by a weight function. Two cases of functional dependence of models on current intensity and instantaneous conductance are considered. Mathematical models in differential and integral forms are presented. On their basis, computer macromodels are created and simulations of processes in circuits with arc models are performed. The families of static and dynamic arc voltage and current characteristics are presented.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 4; 819-834
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A mathematical model for calculating contact mass loss resulting from bridge disintegration in vacuum
    Autorzy:
    Borkowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/140398.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    łuk elektryczny
    ubytek masy styków
    styk elektryczny
    oprogramowanie
    łącznik elektryczny
    electrical arc
    contact mass loss
    contact bridge
    software
    Opis:
    The paper presents descriptions of bridge disintegration types and contact mass loss in the bridge stage. There is presented Matlab solvers to solve equation describing dynamic changes of temperature in the bridge region. The final result of program calculations is the mass loss and the volume of the metal of contacts which was lost during the bridge stage.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 4; 399-411
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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