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Rozprawy doktorskie na temat „Electric transformers”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 30 lipca 2024

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1

Siebrits, F. B. (Francois Bart). "Field implementation of a transient voltage measurement facility using HV current transformers." Thesis, Stellenbosch : Stellenbosch University, 2003. http://hdl.handle.net/10019.1/53426.

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Thesis (MScEng)--University of Stellenbosch, 2003.<br>ENGLISH ABSTRACT: The bandwidth of standard HV measurement devices such as capacitive voltage transformers is too limited in order to measure wideband phenomena. This thesis is concerned with the investigation into a non- intrusive HV transient voltage measurement facility using standard substation HV current transformers (CI's) configured in a transconductance topology. The sensing, summation and integration of the CT capacitive earth currents are investigated. This thesis also reports on the development of a optically isolated link

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Bell, Simon Colin. "High-voltage partial-core resonant transformers." Thesis, University of Canterbury. Electrical and Computer Engineering, 2008. http://hdl.handle.net/10092/2161.

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This thesis first describes the reverse method of transformer design. An existing magnetic model for full-core shell-type transformers, based on circuit theory, is summarised. A magneto-static finite element model is introduced and two sample transformers are analysed. The magnetic model based on finite element analysis is shown to be more accurate than the model based on circuit theory. Partial-core resonant transformers are then introduced and their characteristics are explained using an equivalent circuit model. A method of measuring the winding inductances under resonant operation is dev

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Obatoyinbo, Ade. "Development of multi-layer on-package microwave baluns." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/13557.

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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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Minteer, Timothy Michael. "Design of a new transformer isolated analog acquisition system having greatly reduced transformer size and weight while achieving high accuracy." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Spring2008/t_minteer_041308.pdf.

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6

Robalino, Vanegas Diego M. "Loss of life of medium voltage oil-immersed current transformers under thermal accelerated ageing a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=0&did=1934058311&SrchMode=1&sid=2&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1264684717&clientId=28564.

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Lu, Shu. "Power transformer magnetization under GIC/GMD." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-09232008-144706/.

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Wacharasindhu, Tongtawee. "Fuse holder damage investigation." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4599.

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Thesis (M.S.) University of Missouri-Columbia, 2006.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 29, 2007) Includes bibliographical references.

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9

Baningobera, Bwandakassy Elenga. "The IEC 61850 standard-based protection scheme for power transformers." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2713.

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Thesis (Master of Engineering in Electrical Engineering))--Cape Peninsula University of Technology, 2018.<br>Transformer Differential and overcurrent schemes are traditionally used as main and backup protection respectively. The differential protection relay (SEL487E) has dedicated harmonic restraint function which blocks the relay during the transformer magnetizing inrush conditions. However, the backup overcurrent relay (SEL751A) applied to the transformer protection does not have a harmonic restraint element and trips the overcurrent relay during the inrush conditions. Therefore, to prevent

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10

Habibi, Saeid. "Wireless charging of electric vehicles based on resonant inductive power transformers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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Abstract Electric vehicles and their charging stations are among important applications in today's world. The E-mobility industry is changing day-to-day with new ways to reduce charging time of electric vehicles, ease of use in charging process, increasing the efficiency and sometimes remote control access of the charging system. To accomplish this, resonant inductive power transfers is one of the method that can be hired to transfer power to electric vehicles (EVs) over an air-gap and can remarkably improve the range, safety and convenience of the EV battery charging. However, implementat

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11

Edwards, John. "Magnetic flux based transformer model /." [St. Lucia, Qld.], 2002. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16945.pdf.

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Beckers, Peter C. "Design of a Self Regulated and Protected Electrification Transformer." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/335.

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13

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

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Present demagnetization methods for large power system transformers are time consuming and can be dangerous to persons performing demagnetization. The work of this thesis was to develop improved demagnetization methods and to construct an automated instrument that would implement the methods developed. One previously developed method was analyzed for effectiveness. Then, two new methods for demagnetization were developed and also analyzed for effectiveness. An automated test instrument prototype was redesigned to be able to accommodate these methods and to improve the safety of the user. The p

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14

Taberer, Marcel Wayne. "Transient analysis of erroneous tripping at grassridge static VAr compensator." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1020918.

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The research work conducted and presented forward in this document is the evaluation of real time values obtained using three recording devices at two independent locations and implementing them as recorder devices in Eskom’s power system. The research work conducted was presented at an IEEE International Conference (ICIT2013) and Appendix A shows the accepted paper presented. A derived model within a simulation software package known as DIgSILENT PowerFactory is created and Electromagnetic Transient (EMT) studies are performed and then compared to the real time values obtained using the OMICR

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15

Zandberg, Hermanus Andries Jakobus. "Wireless transformer condition monitoring system." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1186.

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The Department of Electrical Engineering in fulfilment of the requirements for the Magister Technologiae in Electrical Engineering at the Cape Peninsula University of Technology November 2013<br>Pole mounted transformers (PMT) in rural areas present an opportunity for local utilities to do current monitoring on these systems. These transformers are exposed to abnormal amounts of stress due to the vast power demand in these areas. The aim of this study is to develop a more cost-effective condition monitoring system. Transformer current monitoring can be a dangerous practice if not done by suita

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16

Das, Debrup. "Dynamic control of grid power flow using controllable network transformers." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43739.

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The objective of the research is to develop a cost-effective, dynamic grid controller called the controllable network transformer (CNT) that can be implemented by augmenting existing load tap changing (LTC) transformers with an AC-AC converter. The concept is based on using a fractionally rated direct AC-AC converter to control the power through an existing passive LTC. By using a modulation strategy based on virtual quadrature sources (VQS), it is possible to control both the magnitude and the phase angle of the output voltage of the CNT without having any inter-phase connections. The CNT arc

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17

Hamrita, Takoi K. "On-line digital signal processing methods for the correction of errors in high voltage power waveform measurements." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/15921.

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

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A comprehensive and general analysis of the electromagnetic fields, power dissipation, and energy storage within transformer windings is presented. Emphasis is placed on applications in switched-mode power conversion. One-dimensional radial variation of the field quantities is assumed. The first phase of the investigation is for sinusoidal excitation; solutions for the current density and magnetic field intensity are derived and studied in order to develop a fundamental understanding of the basic phenomena. Expressions for the power dissipation and energy storage in both single- and

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19

Hughes, Timothy Howard. "On the synthesis of passive networks without transformers." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/265924.

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This thesis is concerned with the synthesis of passive networks, motivated by the recent invention of a new mechanical component, the inerter, which establishes a direct analogy between mechanical and electrical networks. We investigate the minimum numbers of inductors, capacitors and resistors required to synthesise a given impedance, with a particular focus on transformerless network synthesis. The conclusions of this thesis are relevant to the design of compact and cost-effective mechanical and electrical networks for a broad range of applications. In Part 1, we unify the Laplace-domain and

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20

Flory, Isaac Lynnwood. "Modeling, analysis, and design of a 10 kVA, 20 kHz transformer." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-05042010-020300/.

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Phillips, Lyndal, University of Western Sydney, of Science Technology and Environment College, and of Science Food and Horticulture School. "Analysis of polychlorinated biphenyls in transformer oils." THESIS_CSTE_SFH_Phillips_L.xml, 2002. http://handle.uws.edu.au:8081/1959.7/766.

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Polychlorinated Biphenyls (PCBs) were seen as a significant engineering advance when first commercially produced in 1929. They were used as insulators and cooling fluids in electrical transformers and capacitors. There are 209 PCB congenors that are chemically and thermally stable with low inflammability and reactivity. However,they are also highly toxic, suspected carcinogens and bioaccumulate in the food chain. Due to these characteristics they are listed by the United Nations as one of the sixteen worlds persistent organic pollutants POPs). By international agreement, undertaken by the UN,

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22

Mousavi, Takami Kourosh. "Process Control and Simulation of Ferromagnetic Strip in the Power Transformers and Electrical Machines Applications : Electric power systems." Doctoral thesis, Västerås : School of Sustainable Development of Sociaty and Technology, Mälardalen University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-6648.

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Li, Xun. "Physical systems for the active control of transformer noise." Title page, contents and abstract only, 2000. http://hdl.handle.net/2440/37964.

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Traditional means of controlling sound radiated by electrical power transformers involve the construction of large expensive barriers or full enclosures, which cause maintainability and cooling problems. One promising alternative is to use active noise control to cancel the noise. This thesis is concerned with one of the many problems which need to be investigated to develop a practical active noise cancellation system for transformers. This work, in particular, is concerned with the physical system design which includes the selection of the control source types and the evaluation of the near

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24

Yao, Zheng Tong. "Analysis and modelling of dielectric response in power transformer insulation /." [St. Lucia, Qld.], 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16984.pdf.

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Santos, Luciano dos. "Cálculo das perdas técnicas dos transformadores de distribuição, operando em ambiente não-senoidal /." Ilha Solteira : [s.n.], 2006. http://hdl.handle.net/11449/87245.

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Orientador: José Carlos Rossi<br>Banca: Fabio Toshiaki Wakabayashi<br>Banca: Kleiber David Rodrigues<br>Resumo: Este trabalho está direcionado à implementação de uma modelagem que venha possibilitar a realização dos cálculos das perdas técnicas no cobre do transformador trifásico de distribuição operando em condições não-senoidais, através da utilização do valor médio de Distorção Harmônica Total de Corrente drenada por suas cargas. Essa implementação visa facilitar a obtenção dos valores das perdas técnicas para múltiplas unidades transformadoras. Para atingir o objetivo mencionado, realizou-

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26

Benwell, Andrew L. Kovaleski Scott D. "A high voltage piezoelectric transformer for active interrogation." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6847.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 23, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Dr. Scott D. Kovaleski. Vita. Includes bibliographical references.

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27

Gean, Richard T. "Comparison of PWM and resonant technologies in a high voltage DC application." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/42080.

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<p>High voltage transformers inherently contain undesirable parasitic reactances. A resonant circuit formed by the leakage inductance and parasitic reflected capacitance, makes various resonant technologies practical for high voltage dc applications. The components of a typical high voltage power stage will be investigated in order to identify these parasitics and determine their influence on converter operation. Proto-type high voltage converters will be designed and built using PWM and quasi-resonant techniques and experimental results will be given.</p> <p>Dc analysis will be performed for

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Phillips, Lyndal. "Analysis of polychlorinated biphenyls in transformer oil /." View thesis, 2002. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20031222.095244/index.html.

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Thesis (M.Sc.) (Hons.) -- University of Western Sydney, 2002.<br>A thesis submitted to the University of Western Sydney in fulfillment of the requirements for admission to the [degree of] Masters of Science (Honours). Bibliography : leaves 156-163.

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Turkmen, Coskun Aziz. "Calibration Of Conventional Measurement Transformers Against Harmonic Components By Using Field Measurements Of Optical Transducers And Resistive-capacitive Voltage Transformers." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611920/index.pdf.

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It is known from the literature that conventional voltage and current transformers measure inaccurate values for voltage and current harmonics which are parts of power quality. Maximum bandwidth of conventional current transformers, which are used in electricity transmission and distribution systems, is 1.5-2 kHz and it is lower for conventional voltage transformers. Also, it is known that<br>voltages in some frequency spectrum are measured higher and voltages in another frequency spectrum are measured lower by the conventional voltage transformers. Furthermore, because of the phase shift of f

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30

Johansson, Nicklas. "Control of Dynamically Assisted Phase-shifting Transformers." Licentiate thesis, Stockholm : Elektrotekniska system, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4653.

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Roman, Matthew Jang Wooseung. "Disaggregate forecasting models application to Ameren UE's transformer usage /." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/5738.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on October 5, 2009). Thesis advisor: Dr. Wooseung Jang. Includes bibliographical references.

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Van, Jaarsveld Barend Jacobus. "Wide-band modelling of an air-core power transformer winding." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/85823.

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Thesis (MScEng)-- Stellenbosch University, 2013.<br>ENGLISH ABSTRACT: The objective of this project is to develop an electromagnetic model that can be used to accurately calculate the voltage distribution in a transformer winding structure when excited with standard impulse excitation waves. This voltage distribution is required during the design stage of a power transformer to ensure that the insulation is capable of withstanding the occurring electric field stresses during these tests. This study focuses on the modelling of a single disk-type power transformer winding without the presen

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Ntwoku, Stephane Ntuomou. "Dynamic transformer protection a novel approach using state estimation." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45879.

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Transformers are very important parts of any electrical network, and their size increase so does their price. Protecting these important devices is a daunting task due to the wide variety of operating conditions. This thesis develops a new protection scheme based on state estimation.The foundation upon which our protection scheme is built is the modeling of the single phase transformer system of equations. The transformer equations are composed of polynomial and differential equations and this system of equations involving the transformer's electrical quantities are modeled into a system of e

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Lesser, Beverly Brown. "Thermal-magnetic finite element model of a high frequency transformer." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/44121.

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<p>In high-frequency power transformers, magnetic material properties cannot be assumed to be constant. These properties vary with frequency, temperature, and magnetic flux density. Heat generation is, in turn, a function of the magnetic permeability, magnetic flux density, and frequency. Current design methods are either empirical or based on linear, uncoupled models. To better understand the relationship between heat transfer, magnetic flux density, material properties, and core geometry in a miniature, high-frequency transformer, a finite-element program has been developed to solve the coup

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35

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

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Chetty, Manogaran. "Reliability analysis of power transformers : case : Eskom Distribution Eastern Region, 1MVA to 80MVA power transformers." Thesis, 2007. http://hdl.handle.net/10413/5447.

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This dissertation analyses the reliability of power transformers and its impact of failure on system performance. Eskom Distribution, Eastern Region is used as a practical case study, which has an installed transformer base of 6066MVA comprising of 428 transformers ranging from 1 MVA to 8OMVA with voltage levels of 6.6kV to I 32kV. The literature review illustrates the theory and principles of transformers, evolution and changes in design criteria, the function of cellulose and insulating oil, failure modes. operations and maintenance practices and factors affecting the distribution systems pe

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Zheng, Kai-En, and 鄭凱恩. "Impacts of Electric Vehicle Charging on Electric Power Transformers." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/65586314029181111820.

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碩士<br>國立高雄海洋科技大學<br>輪機工程研究所<br>101<br>Electric vehicle (EV) battery charging can be potentially large power system load. Thus, it is important to examine the effect that wide-spread EV charging may have no the power distribution system so that an accurate and realistic assessment can be made of the infrastructure changes needed. The aim of this thesis is to study the effect EV charging on a distribution transformer that supplies dedicated EV load. The EV load is modeled using the results from the measurements of EV charging stations for predicting the net power and harmonic currents generated

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Baltazar, José Paulo Barbosa. "Modelling vertical plate radiatores for electric transformers." Master's thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/88156.

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Baltazar, José Paulo Barbosa. "Modelling vertical plate radiatores for electric transformers." Dissertação, 2014. https://repositorio-aberto.up.pt/handle/10216/88156.

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Strydom, Johan Tjeerd. "Electromagnetic design of integrated resonator-transformers." Thesis, 2009. http://hdl.handle.net/10210/2182.

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D.Ing.<br>In the field of power electronics, the relentless demand for higher efficiencies, lower costs and ever-decreasing volume and profile have driven the development of many innovative technologies. Planarization and hybridization have become a substantial part of present system integration methodology. With the subsequent size reduction, the effects of layout and component parasitics are becoming vital issues in the development of innovative structures. The component ‘parasitics’ can be considered dimensional effects of the component structure that are not considered during the design pr

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"Condition monitoring of transformers : the acoustic method." Thesis, 2010. http://hdl.handle.net/10413/1461.

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Van, Deventer M. J. "Hydrogen gas-in-oil on-line monitor for high voltage current transformers." Thesis, 1991. https://hdl.handle.net/10539/26635.

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A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science in Engineering.<br>The sudden failure of oil paper-insulated current transformers has become a problem of considerable concern due to the cost of the resulting destruction, and danger to personnel. The aim of the dissertation is. to determine the most suitable method of detecting lncipient faults in current transformers, test this method on an experimental current transformer, and finally implement this technique

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Mukherjee, Pritam. "Construction Of Equivalent Circuit Of A Single Isolated Transformer Winding From Frequency Response." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/2055.

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Frequency response analysis (FRA) of transformers is universally accepted as a highly sensitive tool to detect deformations in its windings. This is evident from the fact that customized commercial equipment (popularly called FRA or SFRA instruments) are used and recently the IEEE has issued a draft trial-use guide. Nevertheless, use of FRA is still limited to only detection and there is little progress towards its use for localization of winding deformation. Toward this end, a possible approach would be to compare the healthy and deformed systems in a suitable domain, e.g., their respective m

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Mukherjee, Pritam. "Construction Of Equivalent Circuit Of A Single Isolated Transformer Winding From Frequency Response." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2055.

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Frequency response analysis (FRA) of transformers is universally accepted as a highly sensitive tool to detect deformations in its windings. This is evident from the fact that customized commercial equipment (popularly called FRA or SFRA instruments) are used and recently the IEEE has issued a draft trial-use guide. Nevertheless, use of FRA is still limited to only detection and there is little progress towards its use for localization of winding deformation. Toward this end, a possible approach would be to compare the healthy and deformed systems in a suitable domain, e.g., their respective m

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Sumangala, B. V. "Some Aspects Of Surge Voltage Distribution In Transformers With Enhanced Resolution." Thesis, 2004. https://etd.iisc.ac.in/handle/2005/1181.

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Sumangala, B. V. "Some Aspects Of Surge Voltage Distribution In Transformers With Enhanced Resolution." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1181.

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Swart, Barend Jacques. "Manufacturability improvements of high frequency transformers." Thesis, 2014. http://hdl.handle.net/10210/9413.

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M.Ing. (Electrical and Electronic Engineering)<br>In order to improve the industrialisation of modern power converters, its physical size must be reduced, material must be utilised more efficiently and its manufacturability improved. Consequently, many converters are operated in the ultrasonic frequency range, where the size of its constituent components are considerably reduced. Even at high frequencies of operation, however, magnetic components are still the largest and heaviest components in converters, and do not utilise materials to their maximum benefit. The aim of this work is to invest

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Minhas, Muhammad Salman Aslam. "Dynamic behaviour of transformer winding under short-circuits." Thesis, 2008. http://hdl.handle.net/10539/4764.

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The work presented in this thesis contributes to the understanding of the dynamic behaviour of large power transformer windings under short circuit forces. A simple yet accurate method of prediction of electromagnetic forces is developed and used as input to the dynamic mechanical model. In develop- ing this model the mechanical properties of oil-impregnated pressboard have been investigated and measured in a specially designed rig which simulates the typical power transformer environment. Assumptions have been made regarding these properties to enable them to be meaningfully incorporat

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Van, der Merwe Gabriel Jacobus. "Integreerbare stuurtegnologie vir bipolere drywingselektroniese skakelaars tot 2000 A." Thesis, 2014. http://hdl.handle.net/10210/9295.

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M.Ing. (Electrical and Electronic Engineering)<br>In an attempt to build a 2000A transistor switch. with the possibility of integrating the electromagnetic components, different transistor switch and transformer configurations were investigated and compared. A standard high frequency monolithic transformer was investigated for the integration with the rest of the circuit. Different problems were found as will be discussed. A saturation of the transformer to one side occurred, and a control circuit for this was developed and is discussed. A different approach to transformers, matrix transformer

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Sithole, Calvin. "Partial discharge measurement in distribution power transformers." Thesis, 2013. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1000388.

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M. Tech. Electrical Engineering.<br>Discusses the appearance of partial discharge (PDs) is a problem of insulation failure in high voltage equipment used in power plants. As the insulation of equipment has a sensitive zone, therefore the quality of insulation plays an important role in such power equipment. PDs in power transformers are capable of leading to corrosion on solid insulating materials, thereby in the long term, causing a breakdown of the particular operating component. It follows that the real challenge is to identify the most appropriate method for the measurement and/or detectio

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