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    Wyświetlanie 1-6 z 6
    Tytuł:
    On parameters determination of multi-port equivalent scheme for multi-winding traction transformers
    Autorzy:
    Sobczyk, T. J.
    El Hayek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/950657.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-winding transformer
    equivalent scheme
    multi-port circuit
    traction transformers
    Opis:
    This paper aims to present a new equivalent scheme of multi-windings traction transformers, based on multiport purely inductive circuit. The mathematical background of this equivalent scheme is described. The determination of the different scheme elements is made through a finite-elements calculation of both main and leakage inductances, for the case of a four-winding transformer. A procedure is defined, which allows to estimate the values of these elements from some measurements on the transformer at no-load and short-circuit operations. A specific strategy of short-circuit tests is described, allowing to determine all parameters in a rather simple way.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 1; 17-27
    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:
    Nonlinear behavior analysis of split-winding dry-type transformer using a new star model and a coupled field-circuit approach
    Autorzy:
    Azizian, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/140907.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coupled field circuit
    electromagnetic modeling
    split-winding dry-type transformer
    nonlinear equivalent circuit
    finite element
    Opis:
    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.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 4; 773-787
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of Frequency Response measurement results with end-to-end/interwinding test setup correlation
    Autorzy:
    Banaszak, S.
    Szoka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/141647.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Frequency Response Analysis
    transformer
    winding
    deformation
    test setup
    Opis:
    The paper presents the idea of a Cross Test Comparison (CTC) method for the analysis of Frequency Response measurement results. FRA is used to detect deformations or electric faults in transformer windings. At the current stage of FRA method development, it is possible to perform repetitive measurements, however there are still problems with interpretation of test results. Authors of this paper found that analysis of results coming from two test setups (end-to-end and interwinding capacitive), which is done simultaneously is a more sensitive tool to detect some faults, and in addition it binds the influence of both voltage sides of a transformer in a single test result. The paper contains results obtained from laboratory tests, where controlled deformations were introduced into windings and also measurements from industry. The CTC method combines both the end-to-end and capacitive interwinding measurements into a single dataset, by subtracting the amplitudes at the corresponding frequencies. The resulting combined dataset is more sensitive in identifying deviations from baseline measurements.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 1; 51-64
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of frequency response of transformer winding with axial deformations
    Autorzy:
    Gawrylczyk, K. M.
    Banaszak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/140733.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transformer
    winding
    frequency response analysis (FRA)
    lumped parameters method
    transmission line method
    Opis:
    One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows to determine the mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. Still pending problem is interpretation of measurements results. One of approaches is application of computer modeling to simulate various failure modes and connected with them changes in FRA response. The paper presents two types of models, one based on lumped parameters with RLC elements, and one based on distributed parameters with TLM method. Both methods give similar results, comparable to real measurements of simulated coil.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 1; 5-17
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical description of power losses in a transformer operating in the dual active bridge converter
    Autorzy:
    Barlik, R.
    Nowak, M.
    Grzejszczak, P.
    Zdanowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200805.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    core losses
    winding losses
    ferrite
    planar transformer
    Steinmetz’s equation
    Dowell’s model
    dual active bridge
    straty rdzenia
    straty uzwojenia
    ferryt
    transformator
    równanie Steinmetza
    model Dowella
    Opis:
    The paper presents an analytical approach to the determination of power losses in a high-frequency transformer operating in the dual active bridge (DAB). This transformer, having two single-phase transistor bridge inverters, couples two DC circuits that significantly differ in voltages (280 V and 51 V ±20%). Power losses in the core and windings of the planar transformer 5600 VA /100 kHz were calculated taking into account changes in the value and direction of the energy flow between the coupled DC circuits. These circuits represent storage or renewable energy sources and intermediate circuits of the converters used in distributed generation systems. Calculations were performed using the Steinmetz’s and Dowell’s equations. The analytical results have been verified experimentally.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 3; 561-574
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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