Relevant bibliographies by topics / High frequency transformers

Academic literature on the topic 'High frequency transformers'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "High frequency transformers"

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Teruo Mendes de Souza, Diego, Bruno Valverde, and José Antenor Pomilio. "OVERVOLTAGE PROTECTION FOR HIGH FREQUENCY HIGH VOLTAGE POWER TRANSFORMERS." Eletrônica de Potência 25, no. 1 (February 5, 2020): 125–34. http://dx.doi.org/10.18618/rep.2020.1.0045.

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Seheda, M. S., P. F. Gogolyuk, and Y. V. Blyznak. "High-frequency periodic processes in two-winding power transformers." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 96–100. http://dx.doi.org/10.33271/nvngu/2021-6/096.

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Purpose. Mathematical modeling of high-frequency periodic processes in winding power transformers to improve the technology of their design and operation. Methodology. The methods of the formation of mathematical models for the research of high-frequency periodic processes in transformers and methods of solving systems of partial differential equations are applied. Findings. The mathematical model for the research of high-frequency periodic processes in two-winding transformers, with adequate considering of electromagnetic connections of windings and structural parameters of transformers, is created. Originality. To form a mathematical model for the research of high-frequency periodic processes, a substitute scheme of a two-windings transformer, taking into account the parameters of the electric and magnetic circuits of windings and electromagnetic connections between them, is proposed. Practical value. The mathematical model, which allows analyzing the voltage distribution in the transformer windings for high-frequency periodic processes in windings, and adjusting their insulating abilities, is created.
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ÖZÜPAK, Yıldırım. "Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System." BEN Vol:2 Issue:3 2021 2, no. 3 (February 8, 2021): 1–5. http://dx.doi.org/10.36937/ben.2021.003.001.

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Electronic power transformers (EPT) are transformers that are smaller in size and volume compared to conventional 50 Hz frequency transformers. Medium frequency transformers (MFT) have begun to become important components in high voltage and high power energy conversion systems such as EPTs. In this study, the electric field distribution of these transformers is discussed. The electric field distributions in the transformer have been obtained using the two-dimensional finite element method (FEM). Besides, maximum electric field intensities were obtained in the study. ANSYS@Maxwell simulation program, which realizes a solution based on FEM, was used for these analyzes. Electromagnetic field analyzes of the same transformer under normal conditions were also performed to compare the analyzes. Besides, the values obtained from the high-frequency analysis, the values obtained from the study below 50 Hz frequency, and the values obtained experimentally were compared. In this way, the stress in the insulation material of the transformer and the weak parts of the insulation material were detected. It is expected that the method used will contribute to future studies to examine the results of the electric field distribution analysis of transformers.
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Yoon, Yeunggurl, Yongju Son, Jintae Cho, SuHyeong Jang, Young-Geun Kim, and Sungyun Choi. "High-Frequency Modeling of a Three-Winding Power Transformer Using Sweep Frequency Response Analysis." Energies 14, no. 13 (July 3, 2021): 4009. http://dx.doi.org/10.3390/en14134009.

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A power transformer is an essential device for stable and reliable power transfer to customers. Therefore, accurate modeling of transformers is required for simulation-based analysis with the model. The paper proposes an efficient and straightforward parameter estimation of power transformers based on sweep frequency response analysis (SFRA) test data. The method first develops a transformer model consisting of repetitive RLC sections and mutual inductances and then aligns the simulated SFRA curve with the measured one by adjusting parameters. Note that this adjustment is based on individual parameter impacts on the SFRA curve. After aligning the two curves, the final transformer model can be obtained. In this paper, actual single-phase, three-winding transformer model parameters were estimated based on field SFRA data, showing that SFRA curves simulated from the estimated model are consistent with the measured data.
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Shen, Zhan, Bingxin Xu, Chenglei Liu, Cungang Hu, Bi Liu, Zhike Xu, Long Jin, and Wu Chen. "The Modeling and Simplification of a Thermal Model of a Planar Transformer Based on Internal Power Loss." Sustainability 14, no. 19 (September 21, 2022): 11915. http://dx.doi.org/10.3390/su141911915.

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With the development of high-performance wide-band-gap devices and increasing converter frequency, planar transformers are widely used in high-frequency and high-power-density power conversions. Due to the skin effect and proximity effect, accurate thermal analysis and a simplified thermal model of planar transformers are needed for quick thermal verification as well as system design. This paper proposes two thermal simplification models based on the planar transformer’s thermal impedance network. The internal power loss and thermal coupling between each component are first analyzed. Then, based on thermal radiation theory, the simplified thermal model of the planar transformer is presented. It only requires the input of the total power loss of the planar transformer to calculate the temperature rise, and it does not need the power loss of each component. Finally, the simulation and experimental verification are carried out on a MHz prototype.
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Tian, Zheng Qi, Zhen Hua Li, and Yue Tong. "An Innovative Electronic Current Transformer Applied in High Voltage Systems." Advanced Materials Research 301-303 (July 2011): 1471–76. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1471.

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With the development of power system, Conventional current transformers (CTs) show a growing number of shortcomings. For better performances, Electronic Current Transformers (ECTs) are researched to replace CT. But high price, unsatisfactory life and unpredictable reliability hold back their industrializations. Employing the insulation structure of traditional inverted SF6transformers and the new sensing principle at the same time, using high-precision digital integration algorithm which has higher precision to extracting the power frequency signal, an innovative electronic current transformer is introduced in this paper. Test results show that the transformer has high accuracy, low price, good stability, wide frequency response and long life.
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Gutten, Miroslav, Daniel Korenciak, Matej Kucera, Richard Janura, Adam Glowacz, and Eliasz Kantoch. "Frequency and time fault diagnosis methods of power transformers." Measurement Science Review 18, no. 4 (August 1, 2018): 162–67. http://dx.doi.org/10.1515/msr-2018-0023.

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Abstract The authors describe experimental and theoretical analyses of faults of power transformer winding. Faults were caused by mechanical effect of short-circuit currents. Measurements of transformer were carried out in high-voltage laboratory. Frequency and time diagnostic methods (method SFRA - Sweep Frequency Response Analysis, impact test) were used for the analyses. Coils of transformer windings were diagnosed by means of the SFRA method and the time impact test. The analyzed methods had a significant sensitivity to a relatively small deformation of coil. In the analysis a new technique for analyzing the effects of short-circuit currents is introduced. This technique is developed for high-voltage transformers (different types of power). The proposed analyses show that it is necessary to analyze the value of short-circuit current. Short-circuit current represents a danger for the operation of the power transformer. The proposed approach can be used for other types of transformers. Moreover, the presented techniques have a potential application for fault diagnosis of electrical equipment such as: transformers and electrical machines.
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Braña, L., A. Costa, and R. Lopes. "Development of a power transformer model for high-frequency transient phenomena." Renewable Energy and Power Quality Journal 19 (September 2021): 217–21. http://dx.doi.org/10.24084/repqj19.260.

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In recent years, the proliferation of distributed renewable energy sources and the application of new rules for the exploitation of electrical networks imposed by the markets have dictated increasingly demanding operating conditions for electric power transformers, creating new challenges in their exploration and conservation. Transformers that, in addition to the transmission lines, are certainly the most important and critical element of any electrical energy system. Adequate models are necessary to accurately describe transformer behavior and internal response when submitted to different external requests imposed by the network, particularly during transient phenomena, as well as, to properly assess system vulnerabilities and network optimization. This effort is being carried out today by several research groups in the world, namely from Cigré and IEEE. In this work, a transformer model to be integrated into a timedomain equivalent circuit is developed and discussed. Results obtained with this model are compared with measurements obtained by the Cigré JWG A2/C4.52 in a power transformer used as a reference for the working group.
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Morrill, M. A., V. A. Caliskan, and C. Q. Lee. "High-frequency planar power transformers." IEEE Transactions on Power Electronics 7, no. 3 (July 1992): 607–13. http://dx.doi.org/10.1109/63.145149.

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Jiang, Ting, Jian Feng Jiang, and Xi Jun Yang. "Research on Multi-Stage Series-Connection High-Voltage High-Power Matrix Converter." Advanced Materials Research 347-353 (October 2011): 843–47. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.843.

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Charge storage is an important research topic in smart grid and distributed generation system, pumped storage as one of the most popular large-scale charge storage methods has attracted increasing attention. However, the motor generator of the pumped charge station has high input voltage and heavy load, so in order to get grid connected safely, being soft started by a high voltage converter is necessary. In the view of the existing high voltage high power converters, only the voltage source inverter Multi-stage Series-connection high voltage frequency converters are suitable for this application, and this paper gives analysis of such converters. Based on Carrier Wave Phase-Shifted modulation, this paper proposes a multi-stage Series-connection high voltage frequency converter with balanced output power of the step-down transformer’s secondary windings, in which a winding burdens three symmetry three-phase to single-phase MC outputs, and the same phase outputs of the MC are cascaded at the secondary side of the transformers, letting out one phase of high-voltage AC output. The circuit is consisted of a step-down industry frequency transformer at the network side, three-phase to single-phase MC arrays, a step-up high frequency transformer at the load side and filter components. The simulation result based on MATLAB/SIMULINK shows that the proposed multi-stage Series-connection high voltage frequency converter is feasible and low-cost.
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Dissertations / Theses on the topic "High frequency transformers"

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

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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.
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Imdad, Kashif. "High frequency modeling of power transformers under transients." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/457774.

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This thesis presents the results related to high frequency modeling of power transformers. First, a 25kVA distribution transformer under lightning surges is tested in the laboratory and its high frequency model is proposed. The transfer function method is used to estimate its parameters. In the second part, an advanced high frequency model of a distribution transformer is introduced. In this research, the dual resonant frequency distribution transformer model introduced by Sabiha and the single resonant frequency distribution transformer model under lightning proposed by Piantini at unloaded conditions are investigated and a modified model is proposed that is capable to work on both single and dual resonant frequencies. The simulated results of the model are validated with the results of Sabiha and Piantini that have been taken as reference. Simulations have shown that the results of the modified model such as, secondary effective transfer voltages, transferred impedances and transformer loading agree well with the previous models in both time and frequency domains. The obtained objectives of this research are: * Methodology for determining the parameters of a power transformer. * High frequency modeling of a transformer in order to simulate its transient behavior under surges. * Modification of high frequency model for single and dual resonance frequency. The originality and methodology of this research are: * High frequency transformer model is derived by means of the transfer function method. In the literature, the transfer function method has been used in many applications such as the determination of the mechanical deformations or insulation failure of interturn windings of transformers. In this thesis, the parameters of the proposed model are estimated using the transfer function method. * Modification of high frequency model for single/dual resonance frequency using the transfer function method. The transfer function can also be used to determine the state of the transformer. The modification in the developed model using the proposed technique has been validated. The high frequency transformer model was presented by Sabiha at two resonance frequency under both condition loading and unloading was used as reference model for modification and further enhancement. A transformer with 25kVA capacity was tested in UPC Terrassa Spain in High voltage lab under the effect of impulse voltage and the digital data was stored via oscilloscope in computer. An algorithm was developed to estimate the transformer parameters by transfer function method using fast Fourier transform analysis. In this scheme the two port network theory concept was taken for black box analysis of transformer. The series of transient¿s frequencies of experimental digital data was noted. The transformer parameters such as Z11, Z12, Z21, and Z22 calculated on all these frequencies in order to generate a narrow band of correct frequency at which the transients was developed experimentally and therefore it has to be developed on that specific frequencies. Earlier the transfer function method was used for the mechanical deformation analysis in the transformer, now similar method of modeling used to estimate the parameters of transformer and propose accurate transformer model for two resonance frequencies only and the parameters estimation was based simply placing RLC elements. The proposed model also tested and validated for accuracy and reliability. In the second phase of research high frequency models of transformer for protection from the transients based on experimental data are presented. Which were tested and validated for unloading and loading for Single and Two resonant frequencies, and modeled using transfer function method. The proposed single model leads to others two models which are verified by two port network theory, unloaded transfer under time domain and frequency domain analysis, transformer loading under different loads and transfer function
Esta tesis presenta los resultados relacionados con el modelado en alta frecuencia de transformadores de potencia. Primero, un transformador de distribución de 25 kVA es ensayado a perturbaciones tipo rayo y se propone un modelo de alta frecuencia. El método de la función de transferencia es utilizado para estimar sus parámetros. En segundo lugar, se introduce un modelo avanzado de alta frecuencia. El modelo resulta de la investigación y modificación de los modelos de resonancia dual introducido por Sabiha y el de resonancia única introducido por Piantini con condiciones sin carga. El modelo propuesto es capaz de representar tanto la resonancia única como dual. El modelo es validado a partir de los resultados de referencia de Sabiha y Piantini. Los resultados de simulación indican que el modelo representa las sobretensiones transferidas al secundario, las impedancias de transferencia y el trabajo en carga del transformados coinciden con los modelos anteriores tanto en el dominio temporal y de la frecuencia. Los objetivos obtenidos en esta tesis son: * Metodología para determinar los parámetros de un transformador de potencia. * Modelo de alta frecuencia para simular el comportamiento transitorio frente a perturbaciones. * Modificación del modelo de alta frecuencia para representar una y dos resonancias. La originalidad y metodología de la tesis son: * El modelo de alta frecuencia del transformador ha sido obtenido a partir de la metodología de la función de transferencia. En la literatura, esta metodología ha sido usada en muchas aplicaciones como en la determinación de deformaciones mecánicas o fallo de aislamiento en espiras de transformadores. En esta tesis, los parámetros del modelo propuesto son obtenidos mediante esta metodología. * Modificación del modelo de alta frecuencia con resonancia única o dual utilizando el método de la función de transferencia. La metodología propuesta puede ser utilizada para determinar el estado del transformador. Sabiha propuso un modelo de alta frecuencia representado dos resonancias en condiciones de carga y de vacío. Este modelo ha sido utilizado como referencia para la modificación y mejora. En la tesis, el transformador de distribución 25 kVA disponible en el Departamento de Ingeniería Eléctrica de la UPC en la ESEIAAT ha sido ensayado a impulsos tipo rayo. Un algoritmo ha sido desarrollado para estimar los parámetros del transformador mediante el método de la función de transferencia utilizando la transformada de Fourier. En este esquema, una red de dos puertos ha sido adoptada para el análisis del transformador. Los parámetros del transformador como la Z11, Z12., Z21 y Z22 son calculadas para representar las frecuencias consideradas. Mediante el método de la función de transferencia los parámetros del transformador son determinados. El modelo propuesto se basa en elementos simples RLC capaces de representar con precisión dos frecuencias de resonancia. En la segunda parte de la tesis, un nuevo modelo es introducido capaz de representar ambos modelos de resonancia única y dual en uno solo. Se analiza el caso de carga y vacío.
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Augla, Kader Hmood. "Losses in high frequency power inductors and transformers." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354726.

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This thesis is concerned with some aspects of losses produced in the inductors and transformers of switched-mode power supplies (SMPS). The main subject of study is the eddy-current losses due to non-uniform current distribution across foil windings. These are calculated and measured for the cases when the foil constitutes an air-cored inductor, and when it is used as the secondary of a ferrite cored transformer. A coupled circuit model is used in which the foil inductor is subdivided into sets of mutually coupled filament coils. A formal method of solution of the resulting sets of equations is presented, and alternative mathematical methods of calculating self and mutual inductances are also compared. In addition to this work two other topics are addressed briefly. First, the magnetic fields in and around magnetic cores are measured, and compared with computed results using a 3D magnetostatic package, TOSCA. Secondly, core losses in ferrite cores due to sinusoidal and non-sinusoidal excitation are measured and calculated.
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Water, Wayne. "Modelling and Design of Advanced High Frequency Transformers." Thesis, Griffith University, 2014. http://hdl.handle.net/10072/367584.

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Carbon dioxide emission reduction has been a popular topic in recent years because it alleviates the current global warming crisis. Hence, there is an urgent need to adapt current technologies to help reduce carbon dioxide emissions before the global warming situation worsens. Amongst carbon dioxide reduction technologies, Electric Vehicle (EV) and renewable energy technologies are most likely to assist in improving this current status of the environmental issue in coming years. Due to increased interest in energy storage systems, such as EV and renewable energy, there is a pending need to improve the existing DC-DC converters used. The DC-DC converter systems used at present are usually bulky, costly and inefficient due to their low operating frequency. Hence, by increasing the operating frequency of the DC-DC converter, the size of the passive elements can be greatly reduced. Among these passive elements, the transformer occupies the most important role indisputably. A High Frequency Coaxial Transformer (HFCT), with a range of 1 kW to 20 kW was designed and introduced in this dissertation. The operating frequency was raised to between 100 kHz and 300 kHz in order to achieve high power densities and high performance efficiency. However, the coupling capacitance accompanied by an increased operating frequency (which couples high frequency noise between the primary and secondary windings) can cause serious common mode problems. Hence, the Faraday shield was placed between the windings of introduced transformers. This reduces the coupling capacitance and consequently the electromagnetic interference. The shielding effect analysis has been conducted to verify the HFCT performance with the insertion of the Faraday shield.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
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Xue, Jing. "Single-phase vs. Three-phase High Power High Frequency Transformers." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32919.

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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
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Abou-Fakher, Yehia. "Implementing and simulating low frequency inverters using high frequency transformers and devices." Thesis, University of Bath, 1997. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362147.

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Bjerkan, Eilert. "High frequency modeling of power transformers : Stresses and Diagnostics." Doctoral thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-622.

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In this thesis a reliable, versatile and rigorous method for high frequency power transformer modeling is searched and established. The purpose is to apply this model to sensitivity analysis of FRA (Frequency Response Analysis) which is a quite new diagnostic method for assessing the mechanical integrity of power transformer windings on-site. The method should be versatile in terms of being able to estimate internal and external overvoltages and resonances. Another important aspect is that the method chosen is suitable for real transformer geometries. In order to verify the suitability of the model for real transformers, a specific test-object is used. This is a 20MVA transformer, and details are given in chapter 1.4.

The high frequency power transformer model is established from geometrical and constructional information from the manufacturer, together with available material characteristics. All circuit parameters in the lumped circuit representation is calculated based on these data. No empirical modifications need to be performed. Comparison shows capability of reasonable accuracy in the range from 10 kHz to 1 MHz utilizing a disc-to-disc representation. A compromise between accuracy of model due to discretisation and complexity of the model in a turn-to-turn representation is inevitable.

The importance of the iron core is emphasized through a comparison of representations with/without the core included. Frequency-dependent phenomena are accurately represented using an isotropic equivalent for windings and core, even with a coarse mesh for the FEM-model. This is achieved through a frequency-dependent complex permeability representation of the materials. This permeability is deduced from an analytical solution of the frequency-dependent magnetic field inside the conductors and the core.

The importance of dielectric losses in a transformer model is also assessed. Since published data on the high frequency properties of pressboard are limited, some initial measurements are done on impregnated pressboard at different temperatures and moisture-levels. Tanδ is found to be twice the corresponding value for impregnated paper at frequencies from 50 kHz to 1MHz. Moisture has a minor effect on the losses when frequency approaches 1MHz. Service-aged paper (impregnated) is also tested in order to investigate other ageing-effects than produced water, but the test show the same decreasing influence at higher frequencies as impregnated pressboard with moisture added. The following main conclusions were drawn from this work:

• A simple, analytical approach cannot be used to build a versatile high frequency power transformer model. The reason being mainly the lack of a proper representation of the iron core, since a FEM-representation without the core did not increase coherence to measurements significantly.

• A proper representation of the iron core is very important for the calculation of inductances. Losses mainly originate from the core at intermediate frequencies (10-200 kHz), and not only from eddy currents in the windings as traditionally assumed. The permeability seem to be of less importance as long as it is well above permeability for oil, since the internal resonances mainly depends on the leakage inductances. The core leg equivalent is important for the leakage field and determines the leakage inductances and winding losses.

• Using a frequency-dependent complex permeability in a FEM-simulation makes possible an accurate representation of core and windings using a coarse mesh. If coating resistivity is sufficiently low to create interlaminar currents/ losses, the iron laminates should be represented by a 2-dimensional complex permeability. Coating parameters are seldom available.

• Dielectric properties of power transformer insulating materials depend on frequency, temperature, moisture, ageing and pressure. Temperature has minor influence on FRA-signatures, other parameters have practically no influence.

• Impulse- and resonant overvoltages both internally and on terminals can be analysed using this method with sufficient accuracy, provided the discretisation of the winding is sufficiently refined regarding the frequencies involved. Since terminal behaviour is given by the internal geometry and material parameters, it is assumed that internal behaviour is related to the accuracy of the terminal behaviour.

• FRA sensitivity to axial displacement is 1.2% of total axial height. The sensitivity to radial deformation (forced buckling) is found to be a buckling depth of 9% of the radius of the winding. Turn-to-turn short-circuits could not be modeled correctly since the lumped elements includes several turns. Disc-todisc short circuits are easily detected. Axial bending is not detectable. Detection of loose windings and aged insulation is improbable and will be dependent on the available sensitivity (mainly related to the repeatability of the measurements and the reference utilized for comparison).

The contributions in this work relates to different topics such as; Frequency-dependent iron core representation in FEM, study of interlaminar currents and its effect on the internal magnetic field, characterization of high frequency dielectric properties of impregnated pressboard and service-aged impregnated paper, procedure for evaluation of internal/external overvoltages, and finally sensitivity guidelines for the application of FRA to mechanical deformations.

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Bolborici, Valentin. "Design of low-profile transformers for high-frequency operation." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0006/MQ45982.pdf.

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Jessee, J. Patrick. "A coupled thermal-magnetic finite element model for high frequency transformers." Thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-12172008-063409/.

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Williams, Richard. "High frequency multi-element transformers for switched-mode power supplies." Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283625.

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Books on the topic "High frequency transformers"

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Skutt, Glenn. Modeling multiwinding transformers for high-frequency applications. Durham, N.C: Duke University, 1988.

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Bolborici, Valentin. Design of low-profile transformers for high-frequency operation. Ottawa: National Library of Canada, 1999.

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McLyman, Colonel William T. Designing magnetic components for high frequency DC-DC converters. San Marino, CA (2135 Huntington Dr., Suite 201D, San Marino 91108): KG Magnetics, 1993.

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International High Frequency Power Conversion Conference (9th 1994 San Jose, Calif.). Technical papers of the Ninth International High Frequency Power Conversion 1994 Conference: April 17-21, 1994, San Jose, California. Ventura, Calif., USA: Intertec International, 1994.

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Karamat, Asghar. High frequency inverter-transformer-cycloconverter system for DC to AC (3-phase) power conversion. Uxbridge: Brunel University, 1991.

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M, Krawczonek Walter, and United States. National Aeronautics and Space Administration., eds. High power, high frequency component test facility. [Washington, DC]: National Aeronautics and Space Administration, 1990.

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Dubois, G. Winding Design for High-frequency Transformers. ERA Technology Ltd, 1991.

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Evaluation of a multi-Kw, high frequency transformer for space applications. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., ed. Evaluation of a multi-Kw, high frequency transformer for space applications. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., ed. Evaluation of a multi-Kw, high frequency transformer for space applications. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Book chapters on the topic "High frequency transformers"

1

Bai, Jiawang, Li Yuan, Shu-Tao Xia, Shuicheng Yan, Zhifeng Li, and Wei Liu. "Improving Vision Transformers by Revisiting High-Frequency Components." In Lecture Notes in Computer Science, 1–18. Cham: Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-20053-3_1.

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Portillo, Álvaro, Luiz Fernando de Oliveira, and Federico Portillo. "Calculation of Circuit Parameters of High Frequency Models for Power Transformers Using FEM." In Lecture Notes in Electrical Engineering, 163–82. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5600-5_14.

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Tamil Selvi, S., P. T. Nandh Kishore, Vishnu Ajith, M. K. Akshaya, and N. Karuppiah. "Design of a High-Frequency Transformer Using Genetic Algorithm." In Lecture Notes in Electrical Engineering, 521–28. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8484-5_51.

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Zainal Abidin, M. Firdaus, Mohd Nadzri Mamat, and Mohd Fadzil Bin Ain. "Modelling of High Frequency Coreless Planar Transformer with TWR Hexagonal Winding." In Lecture Notes in Electrical Engineering, 66–71. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8129-5_11.

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Arentsen, M. T., C. L. Bak, F. F. da Silva, and S. Lorenzen. "Partial Discharges of High Frequency Transformer for Space Application in Near Vacuum." In Lecture Notes in Electrical Engineering, 3–14. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_1.

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Fujimura, Tadahiro, Seiya Masuda, Masahiro Kozako, Masayuki Hikita, Kazuo Iida, Tokihiro Umemura, Yusuke Nakamura, Tetsuo Nakamae, Teruhiko Maeda, and Masakazu Higashiyama. "Partial Discharge Measurement and Its High Frequency Characteristics in Cast Resin Transformer." In Lecture Notes in Electrical Engineering, 653–61. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_62.

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Baskaran, K., and G. Indhumathi. "Co-ordination Control of Hybrid AC/DC Micro Grid Using High Frequency Transformer." In Lecture Notes in Electrical Engineering, 25–34. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1299-2_3.

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Sha, Deshang, and Guo Xu. "Dual-Transformer-Based DAB Converter with Wide ZVS Range for Wide Voltage Gain Application." In High-Frequency Isolated Bidirectional Dual Active Bridge DC–DC Converters with Wide Voltage Gain, 71–95. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0259-6_4.

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Peng, Daixiao, Ming Yang, Wenxia Sima, Jinwei Chu, Zhicheng Xie, and Yonglai Liu. "Duality-Based Potential Transformer Model Including Black-Box Circuit for High-Frequency Transient Simulation." In Lecture Notes in Electrical Engineering, 1244–53. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_116.

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Santos, Nelson, J. Fernando Silva, and Vasco Soares. "High-Frequency Transformer Isolated AC-DC Converter for Resilient Low Voltage DC Residential Grids." In IFIP Advances in Information and Communication Technology, 147–55. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78574-5_14.

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Conference papers on the topic "High frequency transformers"

1

Fatemi, Hediyeh, and Reza Abdolvand. "High-frequency thin-film piezoelectric transformers." In 2012 IEEE International Frequency Control Symposium (FCS). IEEE, 2012. http://dx.doi.org/10.1109/fcs.2012.6243690.

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Ammouri, Aymen, Hamed Belloumi, Tarek Ben Salah, and Ferid Kourda. "High-frequency investigation of planar transformers." In 2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM). IEEE, 2014. http://dx.doi.org/10.1109/cistem.2014.7076927.

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Florkowski, M., P. Klys, J. Furgal, and M. Kuniewski. "Propagation of high frequency overvoltages in transformers." In 2014 International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2014. http://dx.doi.org/10.1109/ichve.2014.7035434.

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Loef, Christoph, Rik W. De Doncker, and Bernd Ackermann. "On high frequency high voltage generators with planar transformers." In 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014. IEEE, 2014. http://dx.doi.org/10.1109/apec.2014.6803571.

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Salinas, Guillermo, Alvaro Gimenezy, Jesus A. Oliver, and Roberto Prieto. "Design Guidelines for High-Power and High-Frequency Transformers." In 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2019. http://dx.doi.org/10.1109/apec.2019.8722060.

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Mendes de Souza, Diego Teruo, Bruno Valverde, and Jose Antenor Pomilio. "Overvoltage protection procedures for high frequency high voltage transformers." In 2017 Brazilian Power Electronics Conference (COBEP). IEEE, 2017. http://dx.doi.org/10.1109/cobep.2017.8257279.

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Guastavino, F., S. Galbiati, B. Massa, and E. Torello. "Insulation System Characterization of High Frequency High Voltage Transformers." In 2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2022. http://dx.doi.org/10.1109/ceidp55452.2022.9985332.

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Dey, Anshuman, Navid Shafiei, Rahul Khandekar, Wilson Eberle, and Ri Li. "Improving Thermal Performance of High Frequency Power Transformers using Bobbinless Transformer Design." In 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.

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de Souza, Diego Teruo Mendes, and Jose Antenor Pomilio. "Comparison between lumped models for high-voltage high-frequency transformers." In 2018 13th IEEE International Conference on Industry Applications (INDUSCON). IEEE, 2018. http://dx.doi.org/10.1109/induscon.2018.8627252.

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Yao, Weichong, Tania Parveen, Junwei Lu, and Andrew Seagar. "Modular High-Frequency High-Power Transformers for Offshore Wind Turbines." In 2021 IEEE PES Innovative Smart Grid Technologies - Asia (ISGT Asia). IEEE, 2021. http://dx.doi.org/10.1109/isgtasia49270.2021.9715592.

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Reports on the topic "High frequency transformers"

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Mazumder, Sudip K. A Modular and Flexible High-Frequency-Link Transformer with a Reduced Device Count and Zero High-Side Devices. Office of Scientific and Technical Information (OSTI), October 2018. http://dx.doi.org/10.2172/1476384.

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Unzeta, Bruno Bueno, Jan de Boer, Ruben Delvaeye, Bertrand Deroisy, Marc Fontoynont, Daniel Neves Pimenta, Per Reinhold, Sophie Stoffer, and Robert Weitlaner. Review of lighting and daylighting control systems. IEA SHC Task 61, February 2021. http://dx.doi.org/10.18777/ieashc-task61-2021-0003.

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Abstract:
There is a large number of control systems proposed either by lighting manufacturers or motor manufacturers for shading systems. In addition there are many other solutions proposed by specific manufacturers of Building Management Systems (BMS) or manufacturers of components to be installed in luminaires and switches, as well as in the electric lighting architecture (transformers, gateways to the internet, sensors, etc.). For many consumers -i.e.-the installer, the facility manager, or the final user (building occupant) – this forms a complex and dynamic market environment with high frequent changes, every year or even every month or day. In this report we aim to provide some basic strategic information, showing the status of the supply at the time this report was written (2019-2021). Although the market develops very fast, there are principles of controls which are rather independent of the progress of technology.
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