Thematische Bibliographien / Step-up transformer

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Auswahl der wissenschaftlichen Literatur zum Thema „Step-up transformer“

Autor: Grafiati

Veröffentlicht am 30. Juni 2021

Zuletzt aktualisiert am 8. Februar 2022

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Zeitschriftenartikel zum Thema "Step-up transformer"

Lee, Ockgoo, Kyu Hwan An, Chang-Ho Lee und Joy Laskar. „A Parallel-Segmented Monolithic Step-Up Transformer“. IEEE Microwave and Wireless Components Letters 21, Nr. 9 (September 2011): 468–70. http://dx.doi.org/10.1109/lmwc.2011.2161976.

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Susa, D., K. B. Liland, L. Lundgaard und G. Vårdal. „Generator step-up transformer post mortem assessment“. European Transactions on Electrical Power 21, Nr. 5 (29.12.2010): 1802–22. http://dx.doi.org/10.1002/etep.544.

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Sharma, R. Rajesh. „Design of Distribution Transformer Health Management System using IoT Sensors“. September 2021 3, Nr. 3 (16.09.2021): 192–204. http://dx.doi.org/10.36548/jscp.2021.3.005.

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Transformers are one of the primary device required for an AC (Alternating Current) distribution system which works on the principle of mutual induction without any rotating parts. There are two types of transformers are utilized in the distribution systems namely step up transformer and step down transformer. The step up transformers are need to be placed at some regular distances for reducing the line losses happening over the electrical transmission systems. Similarly the step down transformers are placed near to the destinations for regulating the electricity power for the commercial usage. Certain regular check-ups are must for a distribution transformer for increasing its operational life time. The proposed work is designed to regularize such health check-ups using IoT sensors for making a centralized remote monitoring system.

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Nguyen, The Vinh, Thanh Vinh Vo, Pierre Petit, Michel Aillerie und Ngoc Thang Pham. „Optimized pulse transformer for step-up DC-DC converter“. Energy Procedia 119 (Juli 2017): 930–37. http://dx.doi.org/10.1016/j.egypro.2017.07.126.

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Shin, Hoonbum, Varakorn Kasemsuwan, Hyungkeun Ahn, M. El Nokali und Deuk-Young Han. „Electrical analysis of step-up multi-layered piezoelectric transformer“. Journal of Electroceramics 17, Nr. 2-4 (Dezember 2006): 585–90. http://dx.doi.org/10.1007/s10832-006-0471-3.

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Sarajcev, Petar, Antun Meglic und Ranko Goic. „Lightning Overvoltage Protection of Step-Up Transformer Inside a Nacelle of Onshore New-Generation Wind Turbines“. Energies 14, Nr. 2 (08.01.2021): 322. http://dx.doi.org/10.3390/en14020322.

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This paper presents an electromagnetic transient analysis of lightning-initiated overvoltage stresses of the step-up transformers installed inside a nacelle of onshore, multi-megawatt, new-generation wind turbines. The increase in the wind turbine (WT) nominal power output, necessitated introducing the step-up transformer into the nacelle. A transformer installed inside a nacelle is subjected to completely different overvoltage stresses from those present if it were installed at the base of the WT tower. This has serious repercussions on its overvoltage protection (i.e., selection and installation of surge arresters) and insulation coordination. Furthermore, the overvoltage protection of medium-voltage cables (inside the tower) is also problematic when considering their length, proximity to the tower wall, and their screen grounding practices, and needs to be tackled in conjunction with that of the step-up transformer. This paper presents detailed models for the various components of the latest-generation WTs, intended for fast-front transient analysis and assembled within the EMTP software package. We further present the comprehensive results of the lightning-transient numerical simulations, covering both upward and downward (first and subsequent) strikes, their analysis, and recommendations for the optimal selection of medium-voltage surge arresters for the step-up transformers installed inside a nacelle.

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Mrvic, Jovan, Petar Vukelja und Ninoslav Simic. „Generator step up transformer overvoltage protection in EPS power plants“. Zbornik radova, Elektrotehnicki institut Nikola Tesla, Nr. 25 (2015): 87–96. http://dx.doi.org/10.5937/zeint25-9168.

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Yoppy, Yoppy, Mohamad Khoirul Anam, Yudhistira Yudhistira, Priyo Wibowo, Harry Arjadi, Hutomo Wahyu Nugroho und Haryo Dwi Prananto. „Analysis of Step Up Transformer for Pulsed Electric Fields Generator“. Indonesian Journal of Electrical Engineering and Computer Science 3, Nr. 1 (01.07.2016): 59. http://dx.doi.org/10.11591/ijeecs.v3.i1.pp59-66.

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Pulsed electric fields (PEF) is a novel non-thermal food processing whose purpose is inactivating microbes while at the same time preserving food’s nutrition, color, and taste. This paper presents an analysis of step up transormer for PEF high voltage generator. To achieve the optimum PEF effects, the pulse shape should resemble a square, which is characterized by low voltage drop and fast rising time. Through simulations, it has been shown that higher transformer inductance results in lower voltage drop. However at some points, further increasing the inductance would only produces negligible improvements. Meanwhile fast rising time can be achieved by minimizing leakage inductance and parasitic capacitance. Moreover, maximum energy transfer to the load can be obtained by reducing winding resistances. Finally, a case of high voltage generator using ignition coil has been evaluated. Due to its high winding resistances, ignition coil seems to be not suitable for PEF applications.

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Xiong, Ze Cheng, Qiang Yin, Zhi Jun Luo und Hao Pang. „Step-Up DC/DC Transformer Based on LLC Resonant Full Bridge“. Applied Mechanics and Materials 734 (Februar 2015): 864–67. http://dx.doi.org/10.4028/www.scientific.net/amm.734.864.

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In view of the LLC series resonant converter topology, it is well known as suitable for small and medium power application, the stabilization of output voltage and the environment of step-dowm. The scheme is proposed for a kind of the step-up DC/DC transformer based on LLC resonant full bridge. The detailed design method is given. The 3KW prototype is built. The experimental results show it has the characteristics of the constant current discharge, wide working frequency and high power desity, as well, the feasibility is verified.

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Dissertationen zum Thema "Step-up transformer"

Luedtke, Elin. „Minimizing Transformer No-Load Losses at Hydropower Plants : A Study of Effects from Transformer Switch-Off During Stand-by Operation“. Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-447635.

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Hydropower is the most important power balancing resource in the Swedish electrical power system, regulating the power supply to match the load. Consequently, several hydropower plants have periods of stand-by operation where the power production is absent but where several devices within a plant are still active. Such a device is the step-up power transformer, which during stand-by operation still generates no-load energy losses. These losses can accumulate to a considerable amount of energy and costs during the long technical lifetime of the apparatus. One option to minimize these no-load energy losses is by turning the transformer off when its generating unit is in stand-by operation. However, when this transformer operational change has been explained to experts in the field, the most common response has been that a more frequent reenergizing of a transformer leads to higher risks for errors or transformer breakdowns. This study aimed to analytically investigate three effects from this operational change. First, the potential of fatigue failure for the windings due to the increased sequences of inrush current. Secondly, the thermal cycling as a consequence of change in present losses. Lastly, the energy and economic saving potentials for hydropower plants where this operational adjustment is applied. The study used both established as well as analytical tools explicitly created for this study. These were then applied on currently active transformers in different plant categories in Fortum’s hydropower fleet. The study primarily showed three things. Firstly, risk of fatigue failure due to the increased presence of inrush currents did not affect the transformer’s technical lifetime. Secondly, the thermal cycling changes were slightly larger with absent no-load losses during stand-by operation. The average temperature for the transformer decreased, which in general is seen as a positive indicator for a longer insulation lifetime and thus the transformer’s technical lifetime. Finally, the created frameworks showed the potential of saving energy and money for all plant categories, where the potential grew with the installed production capacity and the stand-by operation timeshare. Despite the simplifications made to describe the complex reality of a transformer operating in a hydropower plant, this thesis contributes to lay a foundation for future investigation of an easy adjustment to avoid unnecessary energy losses and costs for transformers in hydropower plants.

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Amaral, Nádia Bentz de Souza. „Estudo sobre critérios para a especificação de transformadores elevadores de estações geradoras (\"generator step-up transformers\")“. Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-09082007-182328/.

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Esse trabalho mostra alguns aspectos construtivos e de sistema que devem fazer parte do projeto e da especificação de um transformador elevador, também conhecido na literatura como generator step-up transformer. O projeto do equipamento é baseado em sua especificação técnica. No entanto, algumas vezes observa-se que a especificação técnica não contempla alguns pontos de extrema importância e que poderão ser cruciais para o bom desempenho do transformador quando em serviço. Transformadores elevadores estão sujeitos a distúrbios do sistema onde operam. O efeito desses distúrbios no equipamento pode ser atenuado através de uma especificação técnica que seja a mais completa possível, no sentido de fornecer informações a respeito do sistema e conexão do transformador tanto ao gerador quanto à rede elétrica; por parte do fabricante cabe o trabalho de interpretar a especificação do equipamento, a fim de projetar um equipamento que opere de forma satisfatória face aos requisitos especificados.
This work presents some constructive and operational aspects that should be take into account on the transformer design and specification. The design of the equipment is based on its technical specification. However, sometimes, it is observed that the technical specification does not contemplate some important points which could be crucial for the good transformer performance when in service. Generator step-up transformers are subject to some system disturbance where they are connected. The effect of these disturbances on the equipment could be minimize with a technical specification as complete as possible, on the sense of provide information regarding the network and connections between generator and power transformer. On the other hand, the manufacturer has the responsibility to interpret the technical requirements in order to design an equipment that operates satisfactory.

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Yang, Fu-Qiang, und 楊傅强. „Development of Wide Step-Up Ratio and Contactless Type Converters Via Transformer Characteristics“. Thesis, 2015. http://ndltd.ncl.edu.tw/handle/t9c6za.

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碩士
弘光科技大學
環境工程研究所
103
The object of this thesis is to investigate two converters via the development transformer characteristics for a wide step-up voltage and a contactless type. The first novel interleaved boost converter composed of two shunted elementary boost conversion units and an auxiliary inductor, and it can alleviate the switching and conduction losses to increase the conversion efficiency. In order to achieve the input current with the continue waveform characteristic, a small auxiliary inductor in series with the input source is utilized and then the duty ratio of output current is still exceed 20-100% high quality under 1-20 voltage gain. This converter can auto-balance the currents of the interleaved two phases without an additional current-sharing module. The experimental results based on a 2kW, 24V to 48V/110V/240V DC/DC prototype are carried out and the maximum efficiency of the entire high-efficiency power conversion system is over 96% to verify the effectiveness of the theoretical analysis. The second circuit contactless dc/dc converter produces a 200V voltage to the power conversion. The primary side and secondary side with fourth-order resonance compensation circuit composition in series with a half-bridge circuit, mainly to reduce the switching loss, conduction loss and eliminate the influence of leakage inductance. The circuit impedance matching can improve the system transmission efficiency and achieve the objective of the transmission of electrical energy. The output voltage can be adjustable by regulate the conduction duty cycle. The experimental results complete the rated output power of 200V / 700W under a 6mm air gap. The maximum conversion efficiency is over 92%.

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Bücher zum Thema "Step-up transformer"

Salinas-Rodríguez, Sergio G., Juan Arévalo, Juan Manuel Ortiz, Eduard Borràs-Camps, Victor Monsalvo-Garcia, Maria D. Kennedy und Abraham Esteve-Núñez, Hrsg. Microbial Desalination Cells for Low Energy Drinking Water. IWA Publishing, 2021. http://dx.doi.org/10.2166/9781789062120.

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The world's largest demonstrator of a revolutionary energy system in desalination for drinking water production is in operation. MIDES uses Microbial Desalination Cells (MDC) in a pre-treatment step for reverse osmosis (RO), for simultaneous saline stream desalination and wastewater treatment. MDCs are based on bio-electro-chemical technology, in which biological wastewater treatment can be coupled to the desalination of a saline stream using ion exchange membranes without external energy input. MDCs simultaneously treat wastewater and perform desalination using the energy contained in the wastewater. In fact, an MDC can produce around 1.8 kWh of bioelectricity from the energy contained in 1 m3 of wastewater. Compared to traditional RO, more than 3 kWh/m3 of electrical energy is saved. With this novel technology, two low-quality water streams (saline stream, wastewater) are transformed into two high-quality streams (desalinated water, treated wastewater) suitable for further uses. An exhaustive scaling-up process was carried out in which all MIDES partners worked together on nanostructured electrodes, antifouling membranes, electrochemical reactor design and optimization, life cycle assessment, microbial electrochemistry and physiology expertise, and process engineering and control. The roadmap of the lab-MDC upscaling goes through the assembly of a pre-pilot MDC, towards the development of the demonstrator of the MDC technology (patented). Nominal desalination rate between 4-11 Lm-2h-1 is reached with a current efficiency of 40 %. After the scalability success, two MDC pilot plants were designed and constructed consisting of one stack of 15 MDC pilot units with a 0.4 m2 electrode area per unit. This book presents the information generated throughout the EU funded MIDES project and includes the latest developments related to desalination of sea water and brackish water by applying microbial desalination cells. ISBN: 9781789062113 (Paperback) ISBN: 9781789062120 (eBook)

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Buchteile zum Thema "Step-up transformer"

Li, Zhijun, Jie Shan, Cheng-Kuo Chang, Weigen Chen, LingYan Cao und Zhiyong Yang. „Analysis and Diagnosis of Generator Step-Up Transformer Faults“. In Advances in Intelligent Information Hiding and Multimedia Signal Processing, 196–204. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6757-9_25.

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Antony, Nidhin, und K. Karthikeyan. „Multiple Winding Linear Transformer for Interleaved Step-up ZVT Converter“. In Lecture Notes in Electrical Engineering, 621–30. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-2119-7_61.

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Yoon, Man Soon, T. S. Yoon, J. R. Kim, Y. G. Choi und Soon Chul Ur. „The Effects of Geometrical Factors on the Step-Up Ratio in Piezoelectric Transformer“. In THERMEC 2006, 3319–25. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-428-6.3319.

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Islam, Md Rabiul, Youguang Guo und Jianguo Zhu. „Multilevel Converters for Step-Up-Transformer-Less Direct Integration of Renewable Generation Units with Medium Voltage Smart Microgrids“. In Large Scale Renewable Power Generation, 127–49. Singapore: Springer Singapore, 2014. http://dx.doi.org/10.1007/978-981-4585-30-9_5.

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Shulman, Seth, Jeff Deyette, Brenda Ekwurzel, David Friedman, Margaret Mellon, John Rogers und Suzanne Shaw. „Step Up, Connect, Transform“. In Cooler Smarter, 181–96. Washington, DC: Island Press/Center for Resource Economics, 2012. http://dx.doi.org/10.5822/978-1-61091-234-1_9.

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Verstraete, Jonas, Freya Acar, Grazia Concilio und Paola Pucci. „Turning Data into Actionable Policy Insights“. In The Data Shake, 73–89. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-63693-7_6.

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AbstractIt is becoming clearer that data-supported input is essential in the policy making process. But at which point of the process, and in which format, can data aid policy making? And what does an organisation need to turn data into relevant insights? This paper explores the role of data from two perspectives. In the first part, data and data analysis are situated in the policy making process by mapping them onto the data supported policy making model and highlighting the different roles they can assume in each stage and step of the process. The second part discusses a practical framework for policy-oriented data activities, zooming in on the data-specific actions and the actors performing them in each data-supported step of the policy making process. We observe that a close collaboration between the policy maker and data scientist in the framework of an iterative approach permits to transform the policy question into a suited data analysis question and deliver relevant insights with the flexibility desired by decision makers. In conclusion, for data to be turned into actionable policy insights it is vital to set up structures that ensure the presence and the collaboration of policy-oriented and data-oriented competences.

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Huffman, Brian. „Parasitic capacitance effects in step-up transformer design“. In Analog Circuit Design, 268–71. Elsevier, 2011. http://dx.doi.org/10.1016/b978-0-12-385185-7.00013-5.

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Henry, Robert E. „Use of a Three-Winding Step-Up Transformer“. In Models for Design, 61–72. CRC Press, 2017. http://dx.doi.org/10.1201/b22411-6.

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Karia, Noorliza. „Green Logistics Practices and Sustainable Business Model“. In Handbook of Research on the Applications of International Transportation and Logistics for World Trade, 354–66. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1397-2.ch019.

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This chapter presents a broad introduction to the knowledge of green logistics in a practical manner; definition and dimensions of green logistics practices; factors of green practices and their roles and impacts. Given the importance of logistics in global economic and increasing concern in environmental sustainability, this chapter looks at the work model in green leadership for fostering competitiveness and sustainability development in the world. It will look at how green attributes can be transformed into the practical lives of today's leaders, and take away the essence, insights, and tools of green leadership, and step up to the next level as a true firm, definitely from a logistics service provider perspective.

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Lievin, Marc, Patrice Delmas, Jason James und Georgy Gimel’farb. „Lip Contour Extraction from Video Sequences under Natural Lighting Conditions“. In Visual Speech Recognition, 172–212. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-186-5.ch006.

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An algorithm for lip contour extraction is presented in this chapter. A colour video sequence of a speaker’s face is acquired under natural lighting conditions without any particular set-up, make-up, or markers. The first step is to perform a logarithmic colour transform from RGB to HI colour space. Next, a segmentation algorithm extracts the lip area by combining motion with red hue information into a spatio-temporal neighbourhood. The lip’s region of interest, semantic information, and relevant boundaries points are then automatically extracted. A good estimate of mouth corners sets active contour initialisation close to the boundaries to extract. Finally, a set of adapted active contours use an open form with curvature discontinuities along the mouth corners for the outer lip contours, a line-type open active contour when the mouth is closed, and closed active contours with lip shape constrained pressure balloon forces when the mouth is open. They are initialised with the results of the pre-processing stage. An accurate lip shape with inner and outer borders is then obtained with reliable quality results for various speakers under different acquisition conditions.

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Konferenzberichte zum Thema "Step-up transformer"

Huang, C. L., B. R. Lin, H. Y. Shih und J. J. Chen. „Step-UP ZVS converter with bi-transformer“. In 2009 International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2009. http://dx.doi.org/10.1109/icems.2009.5382950.

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Mohan, Amrutha, und Aswathy Rajan. „New transformer less step up/step down dc-ac converter“. In 2015 International Conference on Electrical, Electronics, Signals, Communication and Optimization (EESCO). IEEE, 2015. http://dx.doi.org/10.1109/eesco.2015.7253791.

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Hope, Eric M., Terrance A. Bellei und Magin Reyes. „Wind turbine generator step-up transformer failure investigation“. In 2012 IEEE/PES Transmission and Distribution Conference and Exposition (T&D). IEEE, 2012. http://dx.doi.org/10.1109/tdc.2012.6281584.

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Ibrahim, Zuhair, Jeremiah Stepan, Ali Reza und Daren Slee. „Forensic Examination and Failure Analysis of a 220 MV Step-Up Transformer Fire“. In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62638.

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The paper presents the results of investigation and engineering analysis by Exponent of the failure of a 220 MVA generator step-up transformer in Southern California. The incident was caused by a dielectric breakdown from the high side phase C bushing to the side wall of the transformer. The ensuing fire continued for 27 hours, fueled by approximately 11,000 gallons of dielectric HYTRANS 61 oil. The paper will discuss the investigation, conducted per the IEEE C57.125 “Guide for Failure Investigation, Documentation, and Analysis for Power Transformers and Shunt Reactors.” [1], and the engineering review and analysis to identify the likely failure scenario(s).

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YU, ZHIYONG, ZHANFENG DENG, GUOLIANG ZHAO, JUN GE, ZHENGANG LU, FENG WANG und ZHE ZHOU. „DC Step-up Transformer and Its Control for Photovoltaic“. In 2018 International Conference on Power System Technology (POWERCON). IEEE, 2018. http://dx.doi.org/10.1109/powercon.2018.8601989.

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Corney, Andrew C. „Impedance Bridge Ratio Transformer Calibration by Reference-Step Conductance Build-Up“. In 2004 Conference on Precision electromagnetic Digest. IEEE, 2004. http://dx.doi.org/10.1109/cpem.2004.305624.

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Wang, Wenwei Victor, und Duleepa J. Thrimawithana. „High-Power WPT Systems: Step-up Transformer vs. Partial-Series Tuning“. In 2019 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW). IEEE, 2019. http://dx.doi.org/10.1109/wow45936.2019.9030662.

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Severo, J. A. A., K. V. Fantin und M. E. G. Alves. „Step Up Transformer online monitoring experience in Tucuruí Power Plant“. In Exposition: Latin America. IEEE, 2010. http://dx.doi.org/10.1109/tdc-la.2010.5762910.

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Xie, Wenhao, Yifei Zheng, Shouxiang Li, Jianze Wang, Yanchao Ji und Jilai Yu. „A non-isolated high step-up hybrid resonant converter based on hybrid transformer“. In 2019 IEEE Applied Power Electronics Conference and Exposition (APEC). IEEE, 2019. http://dx.doi.org/10.1109/apec.2019.8721927.

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Furukawa, Koichi, Taro Takiguchi, Ryuga Hosoki und Hirotaka Koizumi. „A high step-up DC-DC converter using transformer with intrinsic voltage-doubler“. In 2015 IEEE International Symposium on Circuits and Systems (ISCAS). IEEE, 2015. http://dx.doi.org/10.1109/iscas.2015.7169092.

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Berichte der Organisationen zum Thema "Step-up transformer"

Agarwal, Vivek, Nancy J. Lybeck und Binh T. Pham. Diagnostic and Prognostic Models for Generator Step-Up Transformers. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1166054.

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Ostashev, Vladimir, Michael Muhlestein und D. Wilson. Extra-wide-angle parabolic equations in motionless and moving media. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42043.

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Wide-angle parabolic equations (WAPEs) play an important role in physics. They are derived by an expansion of a square-root pseudo-differential operator in one-way wave equations, and then solved by finite-difference techniques. In the present paper, a different approach is suggested. The starting point is an extra-wide-angle parabolic equation (EWAPE) valid for small variations of the refractive index of a medium. This equation is written in an integral form, solved by a perturbation technique, and transformed to the spectral domain. The resulting split-step spectral algorithm for the EWAPE accounts for the propagation angles up to 90° with respect to the nominal direction. This EWAPE is also generalized to large variations in the refractive index. It is shown that WAPEs known in the literature are particular cases of the two EWAPEs. This provides an alternative derivation of the WAPEs, enables a better understanding of the underlying physics and ranges of their applicability, and opens an opportunity for innovative algorithms. Sound propagation in both motionless and moving media is considered. The split-step spectral algorithm is particularly useful in the latter case since complicated partial derivatives of the sound pressure and medium velocity reduce to wave vectors (essentially, propagation angles) in the spectral domain.

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