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    Wyświetlanie 1-9 z 9
    Tytuł:
    Impact of other windings on frequency response of power transformers
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/378065.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    transformer
    frequency response analysis (FRA)
    modelling of windings
    Opis:
    The diagnostics of power transformers is a very fast developing branch. Due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. In the FRA measurements of many power transformers there can be observed a first resonance, which position on frequency axis and damping factor seems to be similar for primary and secondary windings. The authors are going to explain this strange phenomenon, not depending on inductance of the winding being measured.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 81; 31-38
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer modeling in the diagnostics of transformers’ windings deformations
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97341.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    transformer
    computer model
    winding of the transformer
    frequency response
    Opis:
    The diagnostics of power transformers is very important in order to plan repairs and replacements of aged population of transformers operated in Poland and Europe. One of these methods is Frequency Response Analysis - FRA. It can detect any mechanical changes in active part of transformer, which may even lead to serious faults of units in service. As the method is based on comparison of measured curves, which are not always available from previous measurements the computer modeling was applied to create models of windings’ response. The paper presents examples of models created for simple windings and also for real transformer with some deformations of windings simulated.
    Źródło:
    Computer Applications in Electrical Engineering; 2010, 8; 132-140
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Practical use of RLC-models of transformers’ windings for determination of local displacements
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97720.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    transformer’s diagnostic
    frequency response analysis (FRA)
    lumped parameter models
    Opis:
    The diagnostics of power transformers is a very fast developing branch, due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on a real technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. For the aim of windings impedance modeling the RLC models are applied. The idea of lumped parameters models was presented in [6]. The new universal model basing on circuit solution is developed in this paper. Lumped parameters used in calculations are obtained with finite element method and Maxwell package. The examples of models created for simple windings were compared to real measurements.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 100-109
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TLM-method for Computer Modeling of Transformers’ Windings Frequency Response
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97469.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    TLM
    frequency response analysis (FRA)
    FRA
    transformer windings
    Opis:
    The diagnostics of power transformers is a very fast developing branch, due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. For the aim of windings impedance modeling the transmission-line models are applied. The idea of TLM was presented in [1]. While the length of transformer wires is comparable to wave length at high frequency, such approach is reasonable. The paper presents examples of models created for simple windings.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 137-145
    1508-4248
    Pojawia się w:
    Computer Applications in 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:
    RLC-models for computer modeling of transformers’ windings frequency response
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/376937.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    power transformers
    FRA
    frequency response analysis (FRA)
    RLC models
    Opis:
    The diagnostics of power transformers is a very fast developing branch, due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. For the aim of windings impedance modeling the RLC models are applied. The idea of lumped parameters models was presented in [6]. The new universal model basing on circuit solution is developed in this paper. Lumped parameters used are calculated with finite element method and Maxwell package. The examples of models created for simple windings were compared to real measurements.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 73; 107-113
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    TLM-method for computer modeling of transformers’ windings frequency response
    Autorzy:
    Banaszak, S.
    Gawrylczyk, K. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/376947.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    power transformers
    FRA
    TLM
    frequency response analysis (FRA)
    Opis:
    The diagnostics of power transformers is a very fast developing branch, due to increasing average age of assets and changes in asset management strategies, nowadays companies introduce asset management based on technical condition. One of important methods used for diagnostics of a transformer’s active part is Frequency Response Analysis (FRA). It allows determination of mechanical condition of windings, their displacements, deformations and electric faults, as well as some problems with internal leads and connections, core and bushings. For the aim of windings impedance modeling the transmission-line models are applied. The idea of TLM was presented in [1], While the length of transformer wires is comparable to wave length at high frequency, such approach is reasonable. The paper presents examples of models created for simple windings.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2012, 69; 41-47
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Two-level approach for solving the inverse problem of defects identification in Eddy Current Testing - type NDT
    Autorzy:
    Putek, P.
    Crevecoeur, G.
    Slodička, M.
    Gawrylczyk, K.M.
    Van Keer, R.
    Dupré, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/140340.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    charakterystyka wad
    elektromagnetyczny problem odwrotny
    problem odwrotny
    algorytmy optymalizacji
    algorytmy dwupoziomowe
    badanie wiroprądowe
    analiza wrażliwości
    defect characterization
    electromagnetic inverse problem
    two level optimization algorithms
    eddy current testing method
    sensitivity analysis
    Opis:
    This work deals with the inverse problem associated to 3D crack identification inside a conductive material using eddy current measurements. In order to accelerate the time-consuming direct optimization, the reconstruction is provided by the minimization of a last-square functional of the data-model misfit using space mapping (SM) methodology. This technique enables to shift the optimization burden from a time consuming and accurate model to the less precise but faster coarse surrogate model. In this work, the finite element method (FEM) is used as a fine model while the model based on the volume integral method (VIM) serves as a coarse model. The application of the proposed method to the shape reconstruction allows to shorten the evaluation time that is required to provide the proper parameter estimation of surface defects.
    Źródło:
    Archives of Electrical Engineering; 2011, 60, 4; 497-518
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure recognition of conductive materials utilizing FE-algorithms of non-destructive eddy-current testing
    Rozpoznawanie struktury materiałów przewodzących przy wykorzystaniu algorytmów defektoskopii wiroprądowej opartych na MES
    Autorzy:
    Gawrylczyk, K.
    Kugler, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/156974.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    elektromagnetyzm
    metoda elementów skończonych
    pola elektromagnetyczne
    electromagnetism
    finite element analysis
    electromagnetic fields
    Opis:
    The paper deals with progress in electromagnetic methods used for structure evaluation of conducting materials. The term "electromagnetic methods" covers the following areas: magneto-inductive methods, magnetic leakage flux probe method, magnetometer principle and eddy-current methods. In 6948 the German visionary Friedrich Förster established his own company and developed highly sensitive measuring devices for magnetic fields at the Kaiser-Wilhelm-Institute. The methods and examples described in this paper relate only to eddy-current method, but the same idea may be applied for other methods, indeed. For the aim of inner structure recognition the sensitivity analysis with finite elements is proposed.
    Praca dotyczy postępu w elektromagnetycznych metodach badania struktur przewodzących. Od roku 1948, gdy niemiecki wizjoner Friedrich Förster rozpoczął badania w Instytucie Cesarza Wilhelma w badaniach tych nastąpił wielki rozwój. Metody i przykłady opisane w niniejszej pracy odnoszą się jedynie do wiroprądowych badań materiałów, jednak przedstawiona idea może być łatwo przeniesiona do innych metod elektromagnetycznych. Opiera się ona na analizie układu pomiarowego metodą elementów skończonych, a następnie na przeprowadzeniu zadania odwrotnego umożliwiającego identyfikację struktury wewnętrznej materiału. Efektywne przeprowadzenie takiego zadania wymaga dostarczenia informacji o gradiencie funkcji celu, do czego wykorzystywana jest analiza wrażliwościowa wielkości pola elektromagnetycznego. Metody tej analizy, dobrze poznane i opisane w teorii obwodów elektrycznych, są dopiero rozwijane dla pól elektromagnetycznych. Zadania odwrotne prowadzą zwykle do źle uwarunkowanych, nadokreślonych układów równań. Uzyskane rozwiązanie jest często wynikiem kompromisu możliwej do uzyskania rozdzielczości w stosunku do użytych danych pomiarowych obciążonych błędami. Zastosowanie regularyzacji pozwala uzyskać zbieżność algorytmu nawet w takich przypadkach.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 6, 6; 14-17
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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