Bibliographies thématiques / Power transformers design

Sommaire

Articles de revues
Thèses
Livres
Chapitres de livres
Actes de conférences
Rapports d'organisations

Littérature scientifique sur le sujet « Power transformers design »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 11 mars 2023

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres

Choisissez une source :

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « Power transformers design ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "Power transformers design"

Orosz, Tamás, et István Vajda. « Design Optimization with Geometric Programming for Core Type Large Power Transformers ». Electrical, Control and Communication Engineering 6, n^o 1 (23 octobre 2014) : 13–18. http://dx.doi.org/10.2478/ecce-2014-0012.

Texte intégral

Résumé :

Abstract A good transformer design satisfies certain functions and requirements. We can satisfy these requirements by various designs. The aim of the manufacturers is to find the most economic choice within the limitations imposed by the constraint functions, which are the combination of the design parameters resulting in the lowest cost unit. One of the earliest application of the Geometric Programming [GP] is the optimization of power transformers. The GP formalism has two main advantages. First the formalism guarantees that the obtained solution is the global minimum. Second the new solution methods can solve even large-scale GPs extremely efficiently and reliably. The design optimization program seeks a minimum capitalized cost solution by optimally setting the transformer's geometrical and electrical parameters. The transformer's capitalized cost chosen for object function, because it takes into consideration the manufacturing and the operational costs. This paper considers the optimization for three winding, three phase, core-form power transformers. This paper presents the implemented transformer cost optimization model and the optimization results.

Styles APA, Harvard, Vancouver, ISO, etc.

Orosz, Tamás. « FEM-Based Power Transformer Model for Superconducting and Conventional Power Transformer Optimization ». Energies 15, n^o 17 (25 août 2022) : 6177. http://dx.doi.org/10.3390/en15176177.

Texte intégral

Résumé :

There were many promising superconducting materials discovered in the last decades that can significantly increase the efficiency of large power transformers. However, these large machines are generally custom-made and tailored to the given application. During the design process the most economical design should be selected from thousands of applicable solutions in a short design period. Due to the nonlinearity of the task, the cost-optimal transformer design, which has the smallest costs during the transformers’ planned lifetime, is usually not the design with the highest efficiency. Due to the topic’s importance, many simplified transformer models were published in the literature to resolve this problem. However, only a few papers considered this preliminary design optimization problem in the case of superconducting transformers and none of them made a comparison with a validated conventional transformer optimization model. This paper proposes a novel FEM-based two-winding transformer model, which can be used to calculate the main dimension of conventional and superconducting transformer designs. The models are stored in a unified JSON-file format, which can be easily integrated into an evolutionary or genetic algorithm-based optimization. The paper shows the used methods and their accuracy on conventional 10 MVA and superconducting 1.2 MVA transformer designs. Moreover, a simple cost optimization with the 10 MVA transformer was performed for two realistic economic scenarios. The results show that in some cases the cheaper, but less efficient, transformer can be the more economic.

Styles APA, Harvard, Vancouver, ISO, etc.

Баширов, М., Mussa Bashirov, Азат Хисматуллин, Azat Hismatullin, И. Прахов et I. Prahov. « Increasing of Power Oil-Filled Transformers’ Operation Reliability and Safety ». Safety in Technosphere 7, n^o 2 (23 janvier 2019) : 15–21. http://dx.doi.org/10.12737/article_5c35cc6e2354f7.79418159.

Texte intégral

Résumé :

This paper is devoted to the currently urgent problem — increasing reliability and safety for power oil transformers’ operation with considerable long and short overloads through cooling systems’ efficiency upgrading, allowing increase the power oil transformers’ operation safety, engine life, reliability and economical efficiency. Statistical data on fault causes for transformers of different voltage classes and lifecycles have been given. Based on the study of statistical data it has been established that one of the main causes for transformers faults was the inefficiency of oil cooling systems during the summer period of operation and with considerable long and short overloads. For improvement of efficiency of power oil transformers’ cooling system the agitation of cooling oil by circulating sulfur hexafluoride (SF6) and subsequent sulfur hexafluoride cooling with a thermoelectric cooler is proposed. The system of sulfur hexafluoride circulation and cooling switches on automatically at considerable long and short overloads. The design and operation of the proposed cooling system for oil transformers have been considered. A series of laboratory experiments for transformer oil cooling in a power transformer’s tank without and with a compressor has been carried out. Graphs of temperature-time relationship at natural cooling and when using agitation have been presented. The coefficients of transformer oil’s thermal diffusivity and heat transfer at various distances from heating element have been experimentally defined. The mathematical problem of a heat flux distribution in a rectangular parallelepiped has been considered, a solution for thermal conductivity equation in the power transformer’s tank, which is a rectangular parallelepiped, has been presented. A laboratory setup design has been described in detail. Brands of used thermocouples, compressor and analog-digital converter have been presented. Use of the upgraded cooling system will allow increase the transformers operation safety and reliability.

Styles APA, Harvard, Vancouver, ISO, etc.

Su, Biao, Li Xue Li, Yi Hui Zheng, Xin Wang, Yan Liu et Chang Li Dang. « Design and Analysis of PCB Rogowski Coil Current Transformer ». Applied Mechanics and Materials 672-674 (octobre 2014) : 984–88. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.984.

Texte intégral

Résumé :

Electronic current transformers are more suitable for the development of power system compared with traditional electromagnetic current transformers. Rogowski coil current transformer is one of three electric current transformers. According to the measurement principle of Rogowski coils, the equivalent circuit of PCB Rogowski coils is analyzed. By using four PCB Rogowski coils combined, a PCB Rogowski coil current transformer is designed and tested. The results show that the designed PCB Rogowski coil transformer has good linearity and high sensitivity and measurement accuracy and it can meet the requirement of power system.

Styles APA, Harvard, Vancouver, ISO, etc.

Zhang, Zhan, et Cai Xia Gao. « Hardware Design of Online Monitoring System for Power Transformer Malfunction ». Applied Mechanics and Materials 143-144 (décembre 2011) : 618–21. http://dx.doi.org/10.4028/www.scientific.net/amm.143-144.618.

Texte intégral

Résumé :

Power transformers are vital equipments in the grid and their reliability can affect the security of the grid directly. So it is always necessary to monitor the power transformers online. The study designed a multi-parameter online monitoring system for power transformer malfunction utilizing DSP and computer technology. The paper mainly introduced the design and component selection of online monitoring circuit for partial discharge, dielectric loss, gas component in oil and iron core's grounding current. The result showed that this system can diagnose most the malfunctions in power transformers with satisfactory property.

Styles APA, Harvard, Vancouver, ISO, etc.

ÖZÜPAK, Yıldırım. « Performing Structural Design and Modeling of Transformers Using ANSYS-Maxwell ». Brilliant Engineering 2, n^o 2 (29 janvier 2021) : 38–42. http://dx.doi.org/10.36937/ben.2021.002.005.

Texte intégral

Résumé :

Transformers have attracted great interest since they have been used due to their robustness and application in power systems. Therefore, the nominal values of transformers grow even more in larger power systems due to the constantly increasing power demand. Many types of research are carried out to increase the performance characteristics of transformers and their compatibility with power systems. There are different methods and analysis tools for these studies. One of them is ANSYS@Maxwell, which performs analysis based on the Finite Element Method (FEM). With this program, the design, modeling, analysis, and performance evaluation of the transformer in a high-performance simulation environment can be achieved through effective strategic modeling. In this study, the design and modeling of a three-phase core-type transformer with coils and terminals are explained in detail in ANSYS @ Maxwell simulation platform. Besides, the transformer models examined were adapted using ANSYS@MAXWELL software based on the finite element method. Analyzes are performed to estimate the core-losses, leak-losses, DC-losses, and winding-eddy current losses-of transformers with this program. A large number of meshes were used in FEM analysis of 2D and 3D models to examine the losses in detail.

Styles APA, Harvard, Vancouver, ISO, etc.

Ćućić, Branimir, Nina Meško, Martina Mikulić et Dominik Trstoglavec. « Design improvements in modern distribution transformers ». Journal of Energy - Energija 63, n^o 1-4 (2 juillet 2022) : 74–81. http://dx.doi.org/10.37798/2014631-4165.

Texte intégral

Résumé :

In the paper design improvements of distribution transformers related to improved energy efficiency and environmental awareness are discussed. Eco design of transformers, amorphous transformers, voltage regulated transformers and transformers filled with ester liquids are analyzed. As a consequence of growing energy efficiency importance, European Commission has adopted new regulation which defines maximum permissible levels of load and no-load losses of transformers with rated power ≤ 3150 kVA, and minimum peak efficiency index for transformers with rated power > 3150 kVA up to 40 MVA. The impact of new regulation on the design and economy of transformer is presented. Amorphous transformers, with up to 70 % lower no-load losses in comparison to the conventional transformers, could be an alternative with respect to energy efficiency. Although their initial price is higher than the price of conventional transformers, some studies show that they might have economic advantages. The increasing penetration of distributed energy sources can cause an increase in voltage variations in low voltage networks. To keep the voltage within limits defined by EN50160, voltage regulated distribution transformers could be used. Although mineral oil has been used as a dielectric fluid in transformers for many years, there are some environmentally friendlier alternatives – natural and synthetic ester-based fluids.

Styles APA, Harvard, Vancouver, ISO, etc.

Chisepo, Hilary Kudzai, Leslie David Borrill et Charles Trevor Gaunt. « Measurements show need for transformer core joint details in finite element modelling of GIC and DC effects ». COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, n^o 3 (8 mai 2018) : 1011–28. http://dx.doi.org/10.1108/compel-11-2016-0511.

Texte intégral

Résumé :

Purpose This paper aims to improve the finite element modelling of transformers subjected to DC excitation, by including core joint details. Design/methodology/approach Geomagnetically induced currents (GICs) or leakage DC can cause part-cycle, half wave saturation of a power transformer’s core. Practical measurements and finite element matrix (FEM) simulation were carried out using three laboratory-scale, untanked single-phase four limb transformers resembling real power transformers in terms of the core steel and parallel winding assemblies. “Equivalent air gaps” at the joints, based on AC measurements, were applied to the FEM models for simultaneous AC and DC excitation. Findings Measurements confirm that introducing equivalent air gaps at the joints improves the FEM simulation of transformers carrying DC. Research limitations/implications The FEM simulations based on the laboratory transformers are exemplary, showing the difference between modelling core joints as solid or including equivalent air gaps. They show that, for more representative results, laboratory transformers used for research should have mitred core joints (like power transformers). Originality/value This research shows why joint details are important in FEM models for analysing transformer core saturation in the presence of DC/GICs. Extending this, other core structures of power transformers with mitred joints should improve the understanding of the leakage flux during half-wave saturation.

Styles APA, Harvard, Vancouver, ISO, etc.

Sopov, Anatoliy I., et Aleksandr V. Vinogradov. « The Heating System of Agricultural Facilities Using Excess Heat Power Transformers ». Elektrotekhnologii i elektrooborudovanie v APK 67, n^o 1 (28 mars 2020) : 42–47. http://dx.doi.org/10.22314/2658-4859-2020-67-1-42-47.

Texte intégral

Résumé :

In power transformers, energy losses in the form of heat are about 2 percent of their rated power, and in transformers of large power centers reach hundreds of kilowatts. Heat is dissipated into the environment and heats the street air. Therefore, there is a need to consume this thermal energy as a source of heat supply to nearby facilities. (Research purpose) To develop methods and means of using excess heat of power transformers with improvement of their cooling system design. (Materials and methods) The authors applied following methods: analysis, synthesis, comparison, monographic, mathematical and others. They analyzed various methods for consuming excess heat from power transformers. They identified suitable heat supply sources among power transformers and potential heat consumers. The authors studied the reasons for the formation of excess heat in power transformers and found ways to conserve this heat to increase the efficiency of its selection. (Results and discussion) The authors developed an improved power transformer cooling system design to combine the functions of voltage transformation and electric heating. They conducted experiments to verify the effectiveness of decisions made. A feasibility study was carried out on the implementation of the developed system using the example of the TMG-1000/10/0.4 power transformer. (Conclusions) The authors got a new way to use the excess heat of power transformers to heat the AIC facilities. It was determined that the improved design of the power transformer and its cooling system using the developed solutions made it possible to maximize the amount of heat taken off without quality loss of voltage transformation.

Styles APA, Harvard, Vancouver, ISO, etc.

Melnikova, O. S., et V. S. Kuznetsov. « Method of calculating the electric strength of oil channels of the main insulation of power transformers ». Vestnik IGEU, n^o 5 (30 décembre 2020) : 48–55. http://dx.doi.org/10.17588/2072-2672.2020.5.048-055.

Texte intégral

Résumé :

The most damage-sensitive unit of power transformers is the main insulation of the oil barrier type. The breakdown of such insulation occurs as a result of the breakdown of the oil channel near the high voltage winding. In accordance with traditional methods of calculating the dielectric strength of insulation, the value of the breakdown strength is determined by empirical formulas depending on the selected width of the oil channel. The existing methods do not consider the influence of the oil channel volume, of the electric strength the statistical characteristics of the oil, the design features of the insulation of power transformers, and do not contain recommendations for creating design models. Thus, to improve the calculation accuracy, it is relevant to develop the evaluation method of dielectric strength of the main insulation of power transformers taking into account the volume and parameters of the breakdown voltage distribution of transformer oil, design features. The research results of the breakdown tension in oil channels with different volumes of transformer oil were used. To improve the accuracy of the calculation and taking into account the design features, the model of the main insulation of power transformers was made in the ANSYS program. Boundary data and assumption of linear stress distribution of transformer coils were considered. A method for calculating the dielectric strength of oil channels of the main insulation of power transformers, considering the volume and parameters of the breakdown voltage distribution of transformer oil was proposed. Unlike the existing methods, when calculating the minimum breakdown strength in the model of the main insulation, the design features of power transformers are taken into account and assumptions are justified to improve the accuracy of the calculation. In accordance with the methodology, the parameters of the dielectric strength of the transformer oil in the oil channel of the high voltage winding of the transformer were calculated. It was concluded that with increase of relative value of breakdown tension, dielectric strength of oil channel is decreasing, and it corresponds to physical sense of breakdown. The method for calculating the dielectric strength of transformer oil can be used when choosing the main insulation of power transformers in design.

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Thèses sur le sujet "Power transformers design"

Carvajal, Angel J. « First principles design of coreless power transformers ». Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/120875.

Texte intégral

Résumé :

Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 117-118).
This thesis presents a theoretical foundation and methodology for designing novel 4-coil high frequency coreless power transformers from first principles via lumped equivalent circuit models. The procedure is applied to construct a design for 100W transformer with an S21 parameter value of .96. Using MATLAB and LTspice, simulation tools have been developed to produce accurate predictions of inductance, resistance, coupling coefficients, and S21 parameter values for an ensemble of coil models. These theoretical calculations have been employed for spiral and cylindrical coils and have been validated with numerous constructed experimental designs. The utility uses a first principles approach and derives these calculations directly from the physical parameters and relative positions of the coils. Simulation outputs greatly aid the engineering task of designing an efficient coreless power transformer.
by Angel J. Carvajal.
M. Eng.

Styles APA, Harvard, Vancouver, ISO, etc.

Shen, Wei. « Design of High-density Transformers for High-frequency High-power Converters ». Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28280.

Texte intégral

Résumé :

Moore's Law has been used to describe and predict the blossom of IC industries, so increasing the data density is clearly the ultimate goal of all technological development. If the power density of power electronics converters can be analogized to the data density of IC's, then power density is a critical indicator and inherent driving force to the development of power electronics. Increasing the power density while reducing or keeping the cost would allow power electronics to be used in more applications. One of the design challenges of the high-density power converter design is to have high-density magnetic components which are usually the most bulky parts in a converter. Increasing the switching frequency to shrink the passive component size is the biggest contribution towards increasing power density. However, two factors, losses and parasitics, loom and compromise the effect. Losses of high-frequency magnetic components are complicated due to the eddy current effect in magnetic cores and copper windings. Parasitics of magnetic components, including leakage inductances and winding capacitances, can significantly change converter behavior. Therefore, modeling loss and parasitic mechanism and control them for certain design are major challenges and need to be explored extensively. In this dissertation, the abovementioned issues of high-frequency transformers are explored, particularly in regards to high-power converter applications. Loss calculations accommodating resonant operating waveform and Litz wire windings are explored. Leakage inductance modeling for large-number-of-stand Litz wire windings is proposed. The optimal design procedure based on the models is developed.
Ph. D.

Styles APA, Harvard, Vancouver, ISO, etc.

Makowski, Nathanael Jared. « Proposal and Analysis of Demagnetization Methods of High Voltage Power System Transformers and Design of an Instrument to Automate the Demagnetization Process ». PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/431.

Texte intégral

Résumé :

Present demagnetization methods for large power system transformers are time consuming and can be dangerous to persons performing demagnetization. The work of this thesis was to develop improved demagnetization methods and to construct an automated instrument that would implement the methods developed. One previously developed method was analyzed for effectiveness. Then, two new methods for demagnetization were developed and also analyzed for effectiveness. An automated test instrument prototype was redesigned to be able to accommodate these methods and to improve the safety of the user. The previously developed method attempts demagnetization based on current flow behavior characteristics. The first new method is a magnetic flux estimation based on saturation time. The second new method is also based on measuring saturation time, modified to account for the variable voltage loss due to wire resistance. The second of the two new methods developed proved to be the most effective for demagnetization and was able to demagnetize a transformer within an error margin of 2%. The instrument designed to perform the demagnetization with this new routine is now in early production stages for an expanded field trial with transformer maintenance teams.

Styles APA, Harvard, Vancouver, ISO, etc.

Xue, Jing. « Single-phase vs. Three-phase High Power High Frequency Transformers ». Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32919.

Texte intégral

Résumé :

This thesis proposes one comparison methodology for single and three-phase high power high frequency transformers in power conversion systems. The objective is to compare the volume of the transformers. And single and three-phase Dual Active Bridge Converter (DAB1 and DAB3) topologies with single and three-phase isolating transformers are selected for the transformer comparison. Design optimization of power transformer has been studied and simplified models have been built for the single and three-phase transformer design optimization in this work, including assumptions for core shapes, materials, winding structures and thermal model. Two design methods have been proposed according to different design constraints, named T â B Method and J â B Method separately. T â B Method is based on feature of the core, which has the major limits of maximum flux density and temperature rise. The flux density should not reach the saturation value of the core, and temperature rise should meet specifications in different applications to assure the performance of the core (permeability, saturation flux density, and core loss) and the insulation of the wire. And J â B Method starts from the comparison of area product in conventional design method. The relationship between area product of transformer cores and the flux and current of the transformer in design is analyzed. There is specified relationship between area product of single and three-phase transformers if flux and current densities are specified for both. Thus J â B Method is proposed with the design constraints of specified current and flux density. Both design methods include both single and three-phase transformer design. One example case for single and three-phase transformer comparison is selected as high power high frequency DAB conversion system. Operation principles are studied for both DAB1 and DAB3 based on previous work. And transformer design based on the T â B and J â B Methods are carried out and transformer volumes are compared. And results show that three-phase transformer has little benefit in volume or thermal than single-phase transformer, when they are utilized in single-phase DAB and three-phase DAB converters separately. Scaled-down single and three-phase DAB systems have been built and volume and thermal tests have been carried out.
Master of Science

Styles APA, Harvard, Vancouver, ISO, etc.

Economides, Sophia Betty. « Design and application of multilayer monolithic microwave integrated circuit transformers ». Thesis, King's College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312971.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Dai, Ning. « Modeling, analysis, and design of high-frequency high-density low-profile power transformers ». Diss., This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-06062008-151512/.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Wilson, Colin Richard. « The design and development of fast pulsed power supplies using Transmission Line Transformers ». Thesis, University of St Andrews, 1992. http://hdl.handle.net/10023/13600.

Texte intégral

Résumé :

This thesis is concerned with the development of Transmission Line Transfomer (TLT) pulsed power supplies and the generation of fast risetime (>50ns), good quality, high repetition-rate voltage pulses for flash x-ray preionisors and other applications. It explains the principle of the TLT and reports on two TLT pulsed power supplies that have been built. The first, or prototype, produced output voltage pulses with risetimes of 50ns and durations of 200ns and was used to power a flash x-ray preionisation source for a mercury bromide laser. The second, a 50kV, 100? device, was built as part of a wider research program concerned with the development of space based pulsed power supplies. The development of ceramic tile technology is also described and the relevant electrical, mechanical and thermal properties of some barium titanate tiles given; it is then shown how ceramic tiles can be used to construct compact pulse generators for TLT systems. Finally, the subject of nonlinear dielectric pulse sharpening is introduced and pulse sharpening in a delay line ladder network containing air-core inductors and non-linear capacitors is demonstrated. It is then explained how these lines can be used to improve the output risetime of a TLT.

Styles APA, Harvard, Vancouver, ISO, etc.

Goad, Stephen D. « The theory and design of switched-mode power transformers for minimum conductor loss ». Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/52290.

Texte intégral

Résumé :

A comprehensive and general analysis of the electromagnetic fields, power dissipation, and energy storage within transformer windings is presented. Emphasis is placed on applications in switched-mode power conversion. One-dimensional radial variation of the field quantities is assumed. The first phase of the investigation is for sinusoidal excitation; solutions for the current density and magnetic field intensity are derived and studied in order to develop a fundamental understanding of the basic phenomena. Expressions for the power dissipation and energy storage in both single- and multi-layer windings are then derived which, upon investigation, yield a technique for minimizing the power dissipation by choosing an optimum conductor thickness. Several levels of accuracy, ranging from exact solutions to very simple and physically meaningful series approximations, are defined and examined to determine their usefulness and range of validity. The time-harmonic treatment is generalized to arbitrary periodic exoitation by means of Fourier analysis, resulting in a powerful extension of its applicability to any possible converter topology. Results for several representative waveshapes are presented from which a fundamental dependence cn the waveform bandwidth is discovered. Practical application of the theoretical analysis is considered by developing models for several couon winding types: single and multi-filar round wire, litz wire, and sheet conductors. Experimental results are presented and compared with the theoretical results for each of these cases. Finally, a design procedure is outlined for switched—mode pour transformers which is based on this work.
Ph. D.

Styles APA, Harvard, Vancouver, ISO, etc.

Gradzki, Pawel Miroslaw. « Core loss characterization and design optimization of high-frequency power ferrite devices in power electronics applications ». Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-165934/.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Di, Capua Giulia. « Models and methods for the design of isolated power converters in high-frequency high-efficiency applications ». Doctoral thesis, Universita degli studi di Salerno, 2013. http://hdl.handle.net/10556/893.

Texte intégral

Résumé :

2011 - 2012
Isolated power supplies design requires the achievement of overall stress, losses, cost, size and reliability trade-off. This problem is of considerable importance in modern applications of power converters, as for energy saving issues as for the achievement of high power density capabilities needed to integrate the power supply into the same boards where the system they feed is hosted. The aim of this PhD dissertation is to discuss the fundamental issues regarding the design of high-efficiency high-power-density isolated power converters, related to the transformers design and to the system-level analysis of functional and parametric correlations existing among transformers and silicon devices in the achievement of high efficiency. Transformer design is the central issue in isolated switching power supplies design. Affording a preliminary reliable investigation of possible feasible power supply designs using off-the-shelf transformers can be of great help in reducing the time to prototyping and the time-to-market. Even though many off-the-shelf transformers are available today for standard applications, many special situations occur such that the design of a custom transformer is required. New design method are needed in order to enable a wider detection and investigation of possible transformer design solutions by means of a straightforward matching between the available magnetic cores, the operating conditions of the transformer to be designed and the design constraints to be fulfilled. A critical re-examination of transformers design methods discussed in technical literature has been afforded to highlighting some common misleading assumptions which can hinder the minimization of the transformer. Thus, a new design approach has been investigated and discussed, which helps in easily identifying possible transformer solutions in critical custom designs for a given application, complying with losses and size constraints. The new method is aimed at quickly identifying possible combinations of magnetic cores and windings turns number when many possible design might be feasible and a fast comparative evaluation is needed for preliminary cores selection. Novel geometric form factors of magnetic core (Kf and Kc) have been introduced and a consequent classification procedure for magnetic cores has been obtained, showing the correlation between the characteristics of the core and the specific applications in which each type of core offers major advantages in terms of minimizing losses and/or size. A magneto-electro-thermal macro model of the transformer has been adopted in order to investigate the dependency of total transformer losses on the temperature and to analyze the temperature sensitivity of form factor constraints of magnetic cores for power loss compliance. In particular, temperature-dependent boundaries curves both for the core window area and cross-section and for the form factors Kf and Kc have been obtained, allowing quick identification of feasible design solutions, complying with all design constraints, included thermal issues. Transformers and silicon devices do inextricably share the responsibility of major losses in isolated power supplies, and the optimization of the former normally impinges the one of the latter. As a consequence, the intimate correlation among these parts need to be jointly considered regarding the way the characteristics of one device influence the losses of the other one. In order to achieve reliable comparative evaluations among different design set-up, a new versatile numerical model for commutations analysis of power MOSFETs has been developed. The model takes into account the non-linear behavior of the inter-electrode capacitances and has been conceived to work as with parameters and information contained in the devices datasheets as with more detailed models. A Modified Forward Euler (MFE) numerical technique has been specifically developed and adopted in the realization of a numerical algorithm which solves the non linear system of differential equations describing the effect of parasitic capacitances in whatever operating conditions, in order to overcome the limitation exhibited by ODEs techniques for stiff problems in this particular application. The new MFE technique allows to compare the switching characteristics of MOSFETs with a good level of reliability and to obtain a detailed analysis of capacitive currents paths circulating between MOSFETs in half-bridge configuration during commutations. The numerical device-level model of the MOSFETs couples has been first tested in the analysis of basic non isolated synchronous rectification buck converter and then used into an integrated model allowing the analysis of Active Clamp Forward converters. It has been also demonstrated that the model adopted for the switching cell can be implemented in circuit simulators like Micro-Cap. The correlations existing between the parasitic parameters which characterize both transformer and MOSFETs and their impact on the switching behavior and the efficiency of such a conversion system can be effectively investigated by using such modeling approach, thus overcoming the limitations and unreliability of simplified analytical formulas for the prediction of the ZVS achievement. In particular, the integrated system model has been successfully used to determine the mutual constraint conditions between magnetic devices and solid state devices to achieve soft-switching, and their effects on the physical feasibility and design/selection of such power devices in order to achieve high efficiency. Experimental activities have been done to validate the methods and models proposed, through the implementation of on-line losses measurements techniques for both magnetic and solid state devices. The high switching frequency, high slew rates, high current and low leakage devices make such measures extremely sensitive to the parasitic circuit layout parameters. In order to achieve reliable measurements, non-conventional measurement techniques have been investigated based on the use of current sensing MOSFETs, and applied in the development and implementation of new measuring circuits. [edited by author]
XI n.s.

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Livres sur le sujet "Power transformers design"

M, Del Vecchio Robert, dir. Transformer design principles : With applications to core-form power transformers. 2^e éd. Boca Raton : Taylor & Francis, 2010.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

M, Del Vecchio Robert, dir. Transformer design principles : With applications to core-form power transformers. New York : Taylor & Francis, 2002.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Transformers : Analysis, design, and measurement. Boca Raton, FL : Taylor & Francis, 2012.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Hurley, William G. Transformers and inductors for power electronics : Theory, design and applications. Chichester, West Sussex : Wiley-Blackwell, 2013.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Gönen, Turan. Electric power transmission system engineering : Analysis and design. New York : John Wiley & Sons, 1988.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Gönen, Turan. Electric power transmission system engineering : Analysis and design. New York : J. Wiley, 1988.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

IEEE Power Engineering Society. Transformers Committee. West Coast Subcommittee. et IEEE Standards Board, dir. IEEE seismic guide for power transformers and reactors. New York, NY : Institute of Electrical and Electronics Engineers, 1990.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Georgilakis, Pavlos S. Spotlight on modern transformer design. Dordrecht : Springer, 2009.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Indian Institute of Technology (Kharagpur, India). Dept. of Electrical Engineering., dir. Location of partial discharge in power transformers by computation and measurement of capacitively transmitted voltage surges. New Delhi : Research Scheme on Power, Central Board of Irrigation and Power, 1995.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Blalock, Thomas J. Transformers at Pittsfield : A history of the General Electric large power transformer plant at Pittsfield, Massachusetts. Baltimore, MD : Gateway Press, 1998.

Trouver le texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Plus de sources

Chapitres de livres sur le sujet "Power transformers design"

Zolfaghari, Alireza. « Stacked Inductors and Transformers ». Dans Low-Power CMOS Design for Wireless Transceivers, 17–40. Boston, MA : Springer US, 2003. http://dx.doi.org/10.1007/978-1-4757-3787-5_3.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Di Barba, P., M. E. Mognaschi, A. Savini et J. Turowski. « Cost-Effective Optimal Design of Screens in Power Transformers ». Dans Computer Engineering in Applied Electromagnetism, 41–45. Dordrecht : Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3169-6_7.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Al-Abadi, Ali, Ahmed Gamil et Franz Schatzl. « Optimization of Magnetic Shunts Towards Efficient and Economical Power Transformers Design ». Dans Lecture Notes in Electrical Engineering, 15–26. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_2.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Erickson, Robert W., et Dragan Maksimović. « Transformer Design ». Dans Fundamentals of Power Electronics, 565–86. Boston, MA : Springer US, 2001. http://dx.doi.org/10.1007/0-306-48048-4_15.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Erickson, Robert W., et Dragan Maksimović. « Transformer Design ». Dans Fundamentals of Power Electronics, 485–505. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43881-4_12.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Erickson, Robert W. « Transformer Design ». Dans Fundamentals of Power Electronics, 512–38. Boston, MA : Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-7646-4_14.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Zhu, Fang, et Baitun Yang. « Testing ». Dans Power Transformer Design Practices, 237–62. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021. : CRC Press, 2021. http://dx.doi.org/10.1201/9780367816865-12.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Zhu, Fang, et Baitun Yang. « Core ». Dans Power Transformer Design Practices, 21–43. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021. : CRC Press, 2021. http://dx.doi.org/10.1201/9780367816865-3.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Zhu, Fang, et Baitun Yang. « Load Loss ». Dans Power Transformer Design Practices, 127–44. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021. : CRC Press, 2021. http://dx.doi.org/10.1201/9780367816865-7.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Zhu, Fang, et Baitun Yang. « Insulation ». Dans Power Transformer Design Practices, 61–102. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021. : CRC Press, 2021. http://dx.doi.org/10.1201/9780367816865-5.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "Power transformers design"

White, A. « Design of high voltage power transformers ». Dans 15th IET International School on High Voltage Engineering and Testing 2008. IEE, 2008. http://dx.doi.org/10.1049/ic:20080537.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Beiranvand, Hamzeh, Esmaeel Rokrok, Behrooz Rezaeealam et Amit Kumar. « Optimal design of medium-frequency transformers for solid-state transformer applications ». Dans 2017 8th Power Electronics, Drive Systems & Technologies Conference (PEDSTC). IEEE, 2017. http://dx.doi.org/10.1109/pedstc.2017.7910407.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Al-Abadi, A., A. Gamil et F. Schatzl. « Optimum Shielding Design for Losses and Noise Reduction in Power Transformers ». Dans 2019 6th International Advanced Research Workshop on Transformers (ARWtr). IEEE, 2019. http://dx.doi.org/10.23919/arwtr.2019.8930176.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Shotts, Zac, Frank Rose, Steve Merryman et Ray Kirby. « Design Methodology for Dual Resonance Pulse Transformers ». Dans 2005 IEEE Pulsed Power Conference. IEEE, 2005. http://dx.doi.org/10.1109/ppc.2005.300516.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Paffrath, Meinhard, Yayun Zhou, Yiqing Guo et Harald ErtL. « Interactive winding geometry design of power transformers ». Dans 2018 4th International Conference on Optimization and Applications (ICOA). IEEE, 2018. http://dx.doi.org/10.1109/icoa.2018.8370494.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Di Capua, Giulia, et Nicola Femia. « Geometric form Factors-Based Power Transformers Design ». Dans 2018 15th International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD). IEEE, 2018. http://dx.doi.org/10.1109/smacd.2018.8434889.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Dey, Anshuman, Navid Shafiei, Rahul Khandekar, Wilson Eberle et Ri Li. « Improving Thermal Performance of High Frequency Power Transformers using Bobbinless Transformer Design ». Dans 2020 19th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2020. http://dx.doi.org/10.1109/itherm45881.2020.9190320.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Prabhu, D. R., et D. L. Taylor. « Synthesis of Systems From Specifications Containing Orientations and Positions Associated With Flow Variables ». Dans ASME 1989 Design Technical Conferences. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/detc1989-0047.

Texte intégral

Résumé :

Abstract A class of systems can be specified by a set of constant input-output power variables with generalized flow variables having associated orientations and positions. This paper presents a method for generating conceptual parametric designs. A quasi-decoupled approach is taken to solve the problem. A hierarchy of considerations of magnitude, orientation and position transforms is established. Orientation and position transformers are introduced in each domain. A solution to the “vector” problem is obtained by augmenting the “scalar” solution using vector transformers.

Styles APA, Harvard, Vancouver, ISO, etc.

Yeh, Chih-Shen, et Jih-Sheng Lai. « A Study on High Frequency Transformer Design in Medium-voltage Solid-state Transformers ». Dans 2018 Asian Conference on Energy, Power and Transportation Electrification (ACEPT). IEEE, 2018. http://dx.doi.org/10.1109/acept.2018.8610778.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Gradzki, P. M., M. M. Jovanovic et F. C. Lee. « Computer-aided design for high-frequency power transformers ». Dans Applied Power Electronics Conference and Exposition. IEEE, 1990. http://dx.doi.org/10.1109/apec.1990.66427.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Rapports d'organisations sur le sujet "Power transformers design"

Makowski, Nathanael. Proposal and Analysis of Demagnetization Methods of High Voltage Power System Transformers and Design of an Instrument to Automate the Demagnetization Process. Portland State University Library, janvier 2000. http://dx.doi.org/10.15760/etd.431.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Broverman, A. Y. Optimum transformer design for a pulsed power system. Office of Scientific and Technical Information (OSTI), novembre 1987. http://dx.doi.org/10.2172/5508881.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Rodríguez Burgos, Ojel L. Necessity Has Triumphed over Desire. Puerto Rico Institute for Economic Liberty, septembre 2022. http://dx.doi.org/10.53095/13582004.

Texte intégral

Résumé :

Liberalism is the political doctrine that built and dominates our modern world; yet the liberalism of desire that fostered the construction of this world has been transformed into a liberalism of necessity—a liberalism that constructs politics as a dichotomy between oppressors and victims. This kind of politics requires the power of the State to save individuals from victimhood; however, only the individual acting freely can mitigate their suffering.

Styles APA, Harvard, Vancouver, ISO, etc.

Mazarakis, Michael Gerrassimos, et Kenneth William Struve. Conceptual design for a linear-transformer driver (LTD)-based refurbishment and upgrade of the Saturn accelerator pulse-power system. Office of Scientific and Technical Information (OSTI), septembre 2006. http://dx.doi.org/10.2172/894744.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!