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Artykuły w czasopismach na temat "High frequency transformers"
Teruo Mendes de Souza, Diego, Bruno Valverde i José Antenor Pomilio. "OVERVOLTAGE PROTECTION FOR HIGH FREQUENCY HIGH VOLTAGE POWER TRANSFORMERS". Eletrônica de Potência 25, nr 1 (5.02.2020): 125–34. http://dx.doi.org/10.18618/rep.2020.1.0045.
Pełny tekst źródłaSeheda, M. S., P. F. Gogolyuk i Y. V. Blyznak. "High-frequency periodic processes in two-winding power transformers". Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, nr 6 (2021): 96–100. http://dx.doi.org/10.33271/nvngu/2021-6/096.
Pełny tekst źródłaÖZÜPAK, Yıldırım. "Medium Frequency Electric Field Analysis of Power Transformers in High Voltage System". BEN Vol:2 Issue:3 2021 2, nr 3 (8.02.2021): 1–5. http://dx.doi.org/10.36937/ben.2021.003.001.
Pełny tekst źródłaYoon, Yeunggurl, Yongju Son, Jintae Cho, SuHyeong Jang, Young-Geun Kim i Sungyun Choi. "High-Frequency Modeling of a Three-Winding Power Transformer Using Sweep Frequency Response Analysis". Energies 14, nr 13 (3.07.2021): 4009. http://dx.doi.org/10.3390/en14134009.
Pełny tekst źródłaShen, Zhan, Bingxin Xu, Chenglei Liu, Cungang Hu, Bi Liu, Zhike Xu, Long Jin i Wu Chen. "The Modeling and Simplification of a Thermal Model of a Planar Transformer Based on Internal Power Loss". Sustainability 14, nr 19 (21.09.2022): 11915. http://dx.doi.org/10.3390/su141911915.
Pełny tekst źródłaTian, Zheng Qi, Zhen Hua Li i Yue Tong. "An Innovative Electronic Current Transformer Applied in High Voltage Systems". Advanced Materials Research 301-303 (lipiec 2011): 1471–76. http://dx.doi.org/10.4028/www.scientific.net/amr.301-303.1471.
Pełny tekst źródłaGutten, Miroslav, Daniel Korenciak, Matej Kucera, Richard Janura, Adam Glowacz i Eliasz Kantoch. "Frequency and time fault diagnosis methods of power transformers". Measurement Science Review 18, nr 4 (1.08.2018): 162–67. http://dx.doi.org/10.1515/msr-2018-0023.
Pełny tekst źródłaBraña, L., A. Costa i R. Lopes. "Development of a power transformer model for high-frequency transient phenomena". Renewable Energy and Power Quality Journal 19 (wrzesień 2021): 217–21. http://dx.doi.org/10.24084/repqj19.260.
Pełny tekst źródłaMorrill, M. A., V. A. Caliskan i C. Q. Lee. "High-frequency planar power transformers". IEEE Transactions on Power Electronics 7, nr 3 (lipiec 1992): 607–13. http://dx.doi.org/10.1109/63.145149.
Pełny tekst źródłaJiang, Ting, Jian Feng Jiang i Xi Jun Yang. "Research on Multi-Stage Series-Connection High-Voltage High-Power Matrix Converter". Advanced Materials Research 347-353 (październik 2011): 843–47. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.843.
Pełny tekst źródłaRozprawy doktorskie na temat "High frequency transformers"
Shen, Wei. "Design of High-density Transformers for High-frequency High-power Converters". Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/28280.
Pełny tekst źródłaPh. D.
Imdad, Kashif. "High frequency modeling of power transformers under transients". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/457774.
Pełny tekst źródłaEsta 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.
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.
Pełny tekst źródłaWater, Wayne. "Modelling and Design of Advanced High Frequency Transformers". Thesis, Griffith University, 2014. http://hdl.handle.net/10072/367584.
Pełny tekst źródłaThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
Griffith School of Environment
Science, Environment, Engineering and Technology
Full Text
Xue, Jing. "Single-phase vs. Three-phase High Power High Frequency Transformers". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/32919.
Pełny tekst źródłaMaster of Science
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.
Pełny tekst źródłaBjerkan, 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.
Pełny tekst źródłaIn 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.
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.
Pełny tekst źródłaJessee, 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/.
Pełny tekst źródłaWilliams, 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.
Pełny tekst źródłaKsiążki na temat "High frequency transformers"
Skutt, Glenn. Modeling multiwinding transformers for high-frequency applications. Durham, N.C: Duke University, 1988.
Znajdź pełny tekst źródłaBolborici, Valentin. Design of low-profile transformers for high-frequency operation. Ottawa: National Library of Canada, 1999.
Znajdź pełny tekst źródłaMcLyman, 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.
Znajdź pełny tekst źródłaInternational 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.
Znajdź pełny tekst źródłaKaramat, Asghar. High frequency inverter-transformer-cycloconverter system for DC to AC (3-phase) power conversion. Uxbridge: Brunel University, 1991.
Znajdź pełny tekst źródłaM, Krawczonek Walter, i United States. National Aeronautics and Space Administration., red. High power, high frequency component test facility. [Washington, DC]: National Aeronautics and Space Administration, 1990.
Znajdź pełny tekst źródłaDubois, G. Winding Design for High-frequency Transformers. ERA Technology Ltd, 1991.
Znajdź pełny tekst źródłaEvaluation of a multi-Kw, high frequency transformer for space applications. [Washington, DC]: National Aeronautics and Space Administration, 1994.
Znajdź pełny tekst źródłaUnited States. National Aeronautics and Space Administration., red. Evaluation of a multi-Kw, high frequency transformer for space applications. [Washington, DC]: National Aeronautics and Space Administration, 1994.
Znajdź pełny tekst źródłaUnited States. National Aeronautics and Space Administration., red. Evaluation of a multi-Kw, high frequency transformer for space applications. [Washington, DC]: National Aeronautics and Space Administration, 1994.
Znajdź pełny tekst źródłaCzęści książek na temat "High frequency transformers"
Bai, Jiawang, Li Yuan, Shu-Tao Xia, Shuicheng Yan, Zhifeng Li i Wei Liu. "Improving Vision Transformers by Revisiting High-Frequency Components". W Lecture Notes in Computer Science, 1–18. Cham: Springer Nature Switzerland, 2022. http://dx.doi.org/10.1007/978-3-031-20053-3_1.
Pełny tekst źródłaPortillo, Álvaro, Luiz Fernando de Oliveira i Federico Portillo. "Calculation of Circuit Parameters of High Frequency Models for Power Transformers Using FEM". W Lecture Notes in Electrical Engineering, 163–82. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5600-5_14.
Pełny tekst źródłaTamil Selvi, S., P. T. Nandh Kishore, Vishnu Ajith, M. K. Akshaya i N. Karuppiah. "Design of a High-Frequency Transformer Using Genetic Algorithm". W Lecture Notes in Electrical Engineering, 521–28. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8484-5_51.
Pełny tekst źródłaZainal Abidin, M. Firdaus, Mohd Nadzri Mamat i Mohd Fadzil Bin Ain. "Modelling of High Frequency Coreless Planar Transformer with TWR Hexagonal Winding". W Lecture Notes in Electrical Engineering, 66–71. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8129-5_11.
Pełny tekst źródłaArentsen, M. T., C. L. Bak, F. F. da Silva i S. Lorenzen. "Partial Discharges of High Frequency Transformer for Space Application in Near Vacuum". W Lecture Notes in Electrical Engineering, 3–14. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_1.
Pełny tekst źródłaFujimura, Tadahiro, Seiya Masuda, Masahiro Kozako, Masayuki Hikita, Kazuo Iida, Tokihiro Umemura, Yusuke Nakamura, Tetsuo Nakamae, Teruhiko Maeda i Masakazu Higashiyama. "Partial Discharge Measurement and Its High Frequency Characteristics in Cast Resin Transformer". W Lecture Notes in Electrical Engineering, 653–61. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_62.
Pełny tekst źródłaBaskaran, K., i G. Indhumathi. "Co-ordination Control of Hybrid AC/DC Micro Grid Using High Frequency Transformer". W Lecture Notes in Electrical Engineering, 25–34. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1299-2_3.
Pełny tekst źródłaSha, Deshang, i Guo Xu. "Dual-Transformer-Based DAB Converter with Wide ZVS Range for Wide Voltage Gain Application". W 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.
Pełny tekst źródłaPeng, Daixiao, Ming Yang, Wenxia Sima, Jinwei Chu, Zhicheng Xie i Yonglai Liu. "Duality-Based Potential Transformer Model Including Black-Box Circuit for High-Frequency Transient Simulation". W Lecture Notes in Electrical Engineering, 1244–53. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31676-1_116.
Pełny tekst źródłaSantos, Nelson, J. Fernando Silva i Vasco Soares. "High-Frequency Transformer Isolated AC-DC Converter for Resilient Low Voltage DC Residential Grids". W 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.
Pełny tekst źródłaStreszczenia konferencji na temat "High frequency transformers"
Fatemi, Hediyeh, i Reza Abdolvand. "High-frequency thin-film piezoelectric transformers". W 2012 IEEE International Frequency Control Symposium (FCS). IEEE, 2012. http://dx.doi.org/10.1109/fcs.2012.6243690.
Pełny tekst źródłaAmmouri, Aymen, Hamed Belloumi, Tarek Ben Salah i Ferid Kourda. "High-frequency investigation of planar transformers". W 2014 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM). IEEE, 2014. http://dx.doi.org/10.1109/cistem.2014.7076927.
Pełny tekst źródłaFlorkowski, M., P. Klys, J. Furgal i M. Kuniewski. "Propagation of high frequency overvoltages in transformers". W 2014 International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2014. http://dx.doi.org/10.1109/ichve.2014.7035434.
Pełny tekst źródłaLoef, Christoph, Rik W. De Doncker i Bernd Ackermann. "On high frequency high voltage generators with planar transformers". W 2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014. IEEE, 2014. http://dx.doi.org/10.1109/apec.2014.6803571.
Pełny tekst źródłaSalinas, Guillermo, Alvaro Gimenezy, Jesus A. Oliver i Roberto Prieto. "Design Guidelines for High-Power and High-Frequency Transformers". W 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2019. http://dx.doi.org/10.1109/apec.2019.8722060.
Pełny tekst źródłaMendes de Souza, Diego Teruo, Bruno Valverde i Jose Antenor Pomilio. "Overvoltage protection procedures for high frequency high voltage transformers". W 2017 Brazilian Power Electronics Conference (COBEP). IEEE, 2017. http://dx.doi.org/10.1109/cobep.2017.8257279.
Pełny tekst źródłaGuastavino, F., S. Galbiati, B. Massa i E. Torello. "Insulation System Characterization of High Frequency High Voltage Transformers". W 2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP). IEEE, 2022. http://dx.doi.org/10.1109/ceidp55452.2022.9985332.
Pełny tekst źródłaDey, Anshuman, Navid Shafiei, Rahul Khandekar, Wilson Eberle i Ri Li. "Improving Thermal Performance of High Frequency Power Transformers using Bobbinless Transformer Design". W 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.
Pełny tekst źródłade Souza, Diego Teruo Mendes, i Jose Antenor Pomilio. "Comparison between lumped models for high-voltage high-frequency transformers". W 2018 13th IEEE International Conference on Industry Applications (INDUSCON). IEEE, 2018. http://dx.doi.org/10.1109/induscon.2018.8627252.
Pełny tekst źródłaYao, Weichong, Tania Parveen, Junwei Lu i Andrew Seagar. "Modular High-Frequency High-Power Transformers for Offshore Wind Turbines". W 2021 IEEE PES Innovative Smart Grid Technologies - Asia (ISGT Asia). IEEE, 2021. http://dx.doi.org/10.1109/isgtasia49270.2021.9715592.
Pełny tekst źródłaRaporty organizacyjne na temat "High frequency transformers"
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), październik 2018. http://dx.doi.org/10.2172/1476384.
Pełny tekst źródłaUnzeta, Bruno Bueno, Jan de Boer, Ruben Delvaeye, Bertrand Deroisy, Marc Fontoynont, Daniel Neves Pimenta, Per Reinhold, Sophie Stoffer i Robert Weitlaner. Review of lighting and daylighting control systems. IEA SHC Task 61, luty 2021. http://dx.doi.org/10.18777/ieashc-task61-2021-0003.
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