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    Wyświetlanie 1-8 z 8
    Tytuł:
    A Power Transformer as a Source of Noise
    Autorzy:
    Zawieska, W. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/90466.pdf
    Data publikacji:
    2007
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    power transformer
    noise reduction
    active methods
    transformer modeling
    rectangular plate vibrations
    transformer noise
    vibroacoustic analysis
    Opis:
    This article presents selected results of analyses and simulations carried out as part of research performed at the Central Institute of Labor Protection – the National Research Institute (CIOP-PIB) in connection with the development of a system for active reduction of noise emitted by high power electricity transformers. This analysis covers the transformer as a source of noise as well as a mathematical description of the phenomenon of radiation of vibroacoustic energy through a transformer enclosure modeled as a vibrating rectangular plate. Also described is an acoustic model of the transformer in the form of an array of loudspeakers.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2007, 13, 4; 381-389
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved modeling of new three-phase high voltage transformer with magnetic shunts
    Autorzy:
    Chraygane, M.
    El Ghazal, N.
    Fadel, M.
    Bahani, B.
    Belhaiba, A.
    Ferfra, M.
    Bassoui, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/950652.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    transformer
    three-phase
    modeling
    EMTP
    microwaves
    power supply
    Opis:
    This original paper deals with a new approach for the study of behavior in nonlinear regime of a new three-phase high voltage power supply for magnetrons, used for the microwave generators in industrial applications. The design of this system is composed of a new three-phase leakage flux transformer supplying by phase a cell, composed of a capacitor and a diode, which multiplies the voltage and stabilizes the current. Each cell. in turn, supplies a single magnetron. An equivalent model of this transformer is developed taking into account the saturation phenomenon and the stabilization process of each magnetron. Each inductance of the model is characterized by a non linear relation between flux and current. This model was tested by EMTP software near the nominal state. The theoretical results were compared to experimental measurements with a good agreement. Relative to the current device, the new systemprovides gains of size, volume, cost of implementation and maintenance which make it more economical.
    Źródło:
    Archives of Electrical Engineering; 2015, 64, 1; 157-172
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new cast-resin transformer thermal model based on recurrent neural networks
    Autorzy:
    Azizian, D.
    Bigdeli, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141202.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast-resin transformer
    dynamics
    recurrent neural networks
    thermal modeling
    Opis:
    Thermal modeling in the transient condition is very important for cast-resin dry-type transformers. In the present research, two novel dynamic thermal models have been introduced for the cast-resin dry-type transformer. These models are based on two artificial neural networks: the Elman recurrent networks (ELRN) and the nonlinear autoregressive model process with exogenous input (NARX). Using the experimental data, the introduced neural network thermal models have been trained. By selecting a typical transformer, the trained thermal models are validated using additional experimental results and the traditional thermal models. It is shown that the introduced neural network based thermal models have a good performance in temperature prediction of the winding and the cooling air in the cast-resin dry-type transformer. The introduced thermal models are more accurate for the temperature analysis of this transformer and they will be trained easily. Finally, the trained and validated thermal models are employed to evaluate the life-time and the reliability of a typical cast-resin dry-type transformer.
    Źródło:
    Archives of Electrical Engineering; 2017, 66, 1; 17-28
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie transformatora piezoelektrycznego z uwzględnieniem samonagrzewania
    Modeling of a piezoelectric transformer when taking into consideration the self-heating
    Autorzy:
    Tomalczyk, K.
    Więcek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/157598.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    transformator piezoelektryczny
    modelowanie elektrotermiczne
    piezoelectric transformer
    electro-thermal modeling
    Opis:
    Artykuł wprowadza w temat zastosowania transformatorów piezoelektrycznych (PT) jako alternatywy dla powszechnych transformatorów z rdzeniem magnetycznym, omawia także najważniejsze problemy występujące przy projektowaniu układów zasilających opartych na PT, ze szczególnym uwzględnieniem zjawisk termicznych. W artykule przedstawiony jest nowy sprzężony model elektrotermiczny uwzględniający zależność częstotliwości rezonansowej od temperatury obliczanej na podstawie strat mocy. Model poprawnie odwzorowuje zjawisko samonagrzewania się PT podczas pracy w zmiennych warunkach w układzie przetwornicy.
    Piezoelectric transformers (PTs) are high quality factor, high efficiency electrical energy transducers based on mechanical coupling between the primary and secondary side. Their power density levels as high as 50W/cm3 make them very promising alternative to traditional magnetic core transformers, primarily in terms of miniaturization and efficiency. There are, however, some problems slowing down their development, among which thermal management is one of the most important. A PT is a resonant transducer designed to work within an exactly determined narrow frequency range (Fig. 1). It can be modeled with use of a simple single-branch circuit model (Fig. 2) in which a series RLC connection correspond to the main resonance. Our research focuses on a prototype 40W step-down ring-shaped PT (Fig. 3) having the advanced multi-layer structure (Fig. 4). Its main resonance of approx. 322 kHz (Fig. 5) exhibits a tendency to move towards higher frequencies with temperature (Fig. 6). This can possibly induce an undesired positive thermal feedback leading to stability problems and thus should be included in modeling and simulation. We propose a simple coupled electro-thermal model (Fig. 7) in which the resonance frequency shift (Fig. 8) depends on the temperature rise calculated from power losses. Our model, contrary to the traditional isothermal one, allows simulating the self-heating phenomenon and its influence on the key waveforms of the PT working in a converter circuit (Fig. 9).
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 11, 11; 973-976
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of electric vehicle charging rates on transformer derating in harmonic-rich battery charger applications
    Autorzy:
    Jouybari-Moghaddam, M.
    Alimardani, A.
    Hosseinian, S.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/140829.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electric vehicle charging
    charging rate
    power quality
    stochastic modeling
    transformer derating
    Opis:
    A study on plug-in electric vehicle (PEV) charging load and its impacts on distribution transformers loss-of-life, is presented in this paper. The assessment is based on residential PEV battery charging. As the exact forecasting of the charging load is not possible, the method for predicting the electric vehicle (EV) charging load is stochastically formulated. With the help of the stochastic model, the effect of fixed, time of use, and real-time charging rates on the charging load and the resultant impact on transformer derating is investigated. A 38-bus test system is adopted as the test system including industrial harmonic sources. Test results demonstrate that uncontrolled EV charging might causes a noticeable change in the K-factor of the transformer, emerging the need for derating, while applying real-time rates for battery charging loads conquers this problem even in case of harmonic-rich chargers.
    Źródło:
    Archives of Electrical Engineering; 2012, 61, 4; 483-497
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie obwodowe transformatora piezoelektrycznego w warunkach podwyższonych napięć i temperatur
    Circuit modeling of a piezoelectric transformer under elevated voltage and temperature conditions
    Autorzy:
    Tomalczyk, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/154446.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    transformator piezoelektryczny
    nieliniowość
    modelowanie obwodowe
    symulacja SPICE
    piezoelectric transformer
    nonlinearity
    circuit modeling
    SPICE simulation
    Opis:
    Artykuł dotyczy modelowania obwodowego transformatorów piezoelektrycznych (PT) przy napięciach i temperaturach zbliżonych do panujących w rzeczywistych warunkach ich pracy. Typowe metody modelowania PT wykorzystują obwód zastępczy o stałych parametrach wyznaczanych przy niskim napięciu i temperaturze. W artykule potwierdzony został wpływ zarówno amplitudy napięcia wejściowego, jak i temperatury, na charakterystyki przejściowe PT. Aby uwzględnić stwierdzone zależności przy modelowaniu obwodowym PT, opracowana została metoda korekcji parametrów modelu PT uwzględniająca zmiany ich wartości w funkcji temperatury i napięcia wejściowego. Metoda ta pozwala uzyskać dużo lepszą zgodność wyników symulacji obwodowych z wynikami pomiarowymi w warunkach podwyższonych napięć i temperatur.
    The paper refers to circuit modeling of piezoelectric transformers (PTs) operating under elevated voltage and temperature conditions. A PT is a resonant mechanical converter of electrical energy. Its characteristics (Fig. 1) are modeled by an equivalent circuit (Fig. 2) whose parameters are typically determined under low-voltage and low-temperature conditions and remain constant regardless of the model application. This approach is possibly erroneous due to the known temperature dependency and nonlinearities of piezoelectric materials. The temperature- and voltage-dependent variation of PT model parameters (Fig. 3) was determined by means of time domain measurements, which contrary to the widely used impedance analysis, allows high input voltages. A method for correction of the model parameters was established. Furthermore, the PT transfer characteristics were measured (Figs. 4 and 5) and compared to simulation results with and without the parameter correction (Fig. 6), showing considerable improvement in modeling accuracy with the new method applied.
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 10, 10; 1206-1209
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on the Low Frequency Transients in Power Transformers and Some Protection-Related Issues
    Autorzy:
    Saied, M. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1203944.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    transformer cores
    inrush current
    protection
    transients
    modeling
    equivalent circuit
    low frequency
    nonlinear model
    simulation
    Opis:
    This paper presents typical results for the non-linear low frequency transients following the energization of power transformers. The three operating conditions of no-load, full-load and internal faults are considered. A direct analytical procedure is applied for solving the corresponding set of differential equations describing the transformers equivalent circuit. The core representation is based on the use of curve fitting applied to their magnetization curves. The results include plots versus time for the supply current, the core flux, the magnetizing current as well as the internal induced voltage. Moreover, graphs for the hysteresis loops relating the instantaneous values of both the excitation current and the core flux are given. An approach is also presented for the numerical determination of the amplitudes of the different harmonics existing in any of these signals utilizing the corresponding equidistant samples. As examples, the DC offset as well as harmonics up to the fourth order are considered. It is shown that several useful features can be extracted from the results in both the time and harmonic domains that can assist in differentiating between overcurrents resulting from short-circuits or inrush phenomena.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2014, 17, 2; 9-16
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    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
      Wyświetlanie 1-8 z 8

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