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Dissertations / Theses on the topic 'Power transformer and reactor'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Curi, Elvys Isaias Mercado. "Metodologia de projeto de alocação de absorvedores dinâmicos para a redução de ruído emitido por transformadores de potência." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3132/tde-28032008-155724/.

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O ruído acústico produzido pelos transformadores elétricos de potência, instalados em áreas urbanas, gera problemas ambientais e desconforto na população vizinha. Neste trabalho propõe-se desenvolver uma metodologia de projeto para reduzir o ruído dos transformadores com o objetivo de atingir níveis de ruído que a legislação ambiental exige. Um transformador elétrico de potência contém um núcleo, no qual encontram-se as bobinas, dentro de um tanque, ao ativar-se o núcleo e a bobina produz ruído e vibração em todos os componentes do transformador. Para diminuir a vibração e o ruído propõe-se o

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2

Karlsson, Svante. "Power Transformer Monitoring and Diagnosis using Transformer Explorer." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-280958.

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Power transformers are one of the most expensive and vital components in the power system. A sudden failure could be a very costly process for both the transformer owner and the society. Several monitoring and diagnostic techniques have been developed over the last decades to detect incipient transformer problems at an early stage, so that planned outages for maintenance and reparation can be carried out in time. However, the majority of these methods are only secondary indicators which do not address the transformers fundamental function: to transfer electric energy between different voltage

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3

Zhong, Ming. "Partial core power transformer." Thesis, University of Canterbury. Electrical and Computer Engineering, 2012. http://hdl.handle.net/10092/7537.

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This thesis describes the design, construction, and testing of a 15kVA, 11kV/230V partial core power transformer (PCPT) for continuous operation. While applications for the partial core transformer have been developed for many years, the concept of constructing a partial core transformer, from conventional copper windings, as a power transformer has not been investigated, specifically to have a continuous operation. In this thesis, this concept has been investigated and tested. The first part of the research involved creating a computer program to model the physical dimensions and the electric

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4

Amuanyena, L. A. T. "Effects of geomagnetically induced currents on power transformers and reactors." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5235.

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5

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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6

Siuda, Petr. "Měnič pro svařování stejnosměrným proudem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242082.

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This master´s thesis with the peripheral and structural design of power converter that will be used for DC welding. The drive itself is based on the principle of two single-acting permeable converters operating in counter strokes to a mutual load. The inverter operates at a frequency of 60kHz, and its output current can be controlled from 0 - 100A. Welder is equipped with a variable constant current or power adjustment. The device is powered from a single-phase 230V.

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7

Elsaharty, Mohamed Atef Abbas. "Custom power active transformer for flexible operation of power systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/620735.

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This PhD dissertation proposes a new transformer, i.e., the Custom Power Active Transformer, characterized by a specific design of its magnetic circuit and auxiliary windings which allows shunt and series compensation to the power system in a single monolithic transformer. Such auxiliary windings are regulated using power converters based on power electronics. The power electronics converters are controlled based on the required added services to the power system which includes power flow control between different areas, power quality improvements, inertia emulation and several other services

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8

Aoki, Ichiro Rutledge David B. "Distributed active transformer for integrated power amplification /." Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechETD:etd-05272004-094928.

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9

McNeill, John Neville. "Current transformer circuits for power electronics applications." Thesis, Edinburgh Napier University, 2008. http://researchrepository.napier.ac.uk/Output/6196.

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This thesis investigates the operation of the current transfonner (CT) when sensing retum-to-zero current pulses in power electronic circuitry. The CT's output signal is nonnally rectified when sensing current pulses and the effects of the different rectification techniques on peak current and average current droop are evaluated. Initially, the various current sensing techniques and their application in power electronics circuits are reviewed. The CT and both diode and synchronous rectification are then reviewed in more detail. Operation of the CT with diode rectification (DR) and natural rese

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10

Guimarães, Gabriel Teófilo Neves. "CMOS linear RF power amplifier with fully integrated power combining transformer." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/169084.

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Este trabalho apresenta o projeto de um amplificador de potência (PA) de rádio-frequência (RF) linear em tecnologia complementar metal-oxido silício (CMOS). Nele são analisados os desafios encontrados no projeto de PAs CMOS assim como soluções encontradas no estado-da-arte. Um destes desafios apresentados pela tecnologia é a baixa tensão de alimentação e passivos com alta perda, o que limita a potência de saída e a eficiência possível de ser atingida com métodos tradicionais de projeto de PA e suas redes de transformação de impedância. Este problema é solucionado através do uso de redes de com

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11

Dong, Xuzhu. "Study of Power Transformer Abnormalities and IT Applications in Power Systems." Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26034.

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With deregulation, diagnosis and maintenance of power equipment, especially power transformers, become increasingly important to keep power systems in reliable operation. This dissertation systematically studied two kinds of transformer failure and abnormality cases, and then developed a new Internet based Virtual Hospital (VH) for power equipment to help power equipment diagnosis and maintenance. A practical case of generator-step-up (GSU) transformer failures in a pumped storage plant was extensively studied. Abnormal electrical phenomena associated with GSU transformers, including switchin

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12

Wong, Fu Keung, and n/a. "High Frequency Transformer for Switching Mode Power Supplies." Griffith University. School of Microelectronic Engineering, 2004. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20050211.110915.

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A power supply is an essential part of all electronic devices. A switching mode power supply is a light weight power solution for most modern electronic equipment. The high frequency transformer is the backbone of modern switched mode power supplies. The skin effect and proximity effects are major problems in high frequency transformer design, because of induced eddy currents. These effects can result in transformers being destroyed and losing their power transferring function at high frequencies. Therefore, eddy currents are unwanted currents in high frequency transformers. Leakage inductance

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13

Bendre, Vijay. "Power Electronic Control of a Partial Core Transformer." Thesis, University of Canterbury. Electrical and Computer Engineering, 2010. http://hdl.handle.net/10092/4927.

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The research programme at the University of Canterbury includes the development and applications of partial core inductors and transformers for high voltage testing of generator insulation. Unlike a conventional full core transformer, a partial core transformer has no limbs and yokes. A partial core transformer is a compromise between a full core and coreless transformer. It is superior to its full core counterpart as far as cost, weight and ease of transportation are concerned. Partial core transformers have a low magnetising reactance and hence draw a high magnetising current. This characte

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14

Razaz, M. "Amorphous metal cores in medium frequency power transformer." Thesis, University of Salford, 1993. http://usir.salford.ac.uk/14782/.

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Theoretical designs have been carried out which demonstrate the possible weight and volume reductions to be obtained when using amorphous metal in place of silicon-iron for the core material in medium frequency power transformers. The amorphous metal provides such savings by its ability to operate at high flux densities without excessive core losses. The reduced core size also benefits the winding size, the overall reduction in weight and volume is particularly appropriate for rail and air borne power supply equipment. Of the various amorphous metal alloys available in ribbon form, two were se

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15

Guo, Dongsheng. "Power transformer condition monitoring with partial discharge measurement." Thesis, Glasgow Caledonian University, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.443183.

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16

Fung, Sze-wei. "Modeling the rosen type piezoelectric transformer for power converters." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B31451226.

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17

Do, Manh Cuong. "Piezoelectric transformer integration possibility in high power density applications." Doctoral thesis, Dresden : TUDpress Verl. der Wiss, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1214984646187-55994.

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18

Do, Manh Cuong. "Piezoelectric Transformer Integration Possibility in High Power Density Applications." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A23676.

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The contents of this work investigate the capability of integrating the PT in applications by invoking the ratio of the throughput power to volume represented by the term: power density. The fundamentals of the PT are introduced in chapter two. In chapter three, the fundamental limitations of the PT's capability of transferring power to the load are studied. There are three major limitations: temperature rise due to losses during operation, electromechanical limits of material, and interactions with output rectifier. The analysis and estimation are then verified by experiments and calculations

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19

Ihlenfeld, Lucas Pioli Rehbein Kürten. "Power transformer passivity enforcement : pre- and post-processing approaches." reponame:Repositório Institucional da UFPR, 2015. http://hdl.handle.net/1884/41195.

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Orientador : Prof. Dr. Gustavo Henrique da Costa Oliveira<br>Dissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia Elétrica. Defesa: Curitiba, 14/09/2015<br>Inclui referências : f. 86-94<br>Resumo: Esta dissertação trata, em bases matemáticas, do estudo das técnicas de aferição e imposição da passividade, uma propriedade qualitativa, geral e fundamental de transformadores. Para esse propósito, são propostas duas novas abordagens: uma de perturbação de dados no domínio da frequência, chamada pré-processamento, bem como um novo proc

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20

Ratanapanachote, Somnida. "Applications of an electronic transformer in a power distribution system." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2756.

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In electrical power distribution and power electronic applications, a transformer is an indispensable component which performs many functions. At its operating frequency (60/50 Hz), it is one of the most bulky and expensive components. The concept of the electronic transformer introduced previously has shown considerable reduction in size, weight, and volume by operating at a higher frequency. In this dissertation, the concept of the electronic transformer is further extended to the auto-connected phase-shifting type to reduce harmonics generated by nonlinear loads. It is shown that with the

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21

Sweeney, David J. "Reactor power history from fission product signatures." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3209.

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22

Kennedy, Ryanne Ariel. "Quantifying Uncertainty in Reactor Flux/Power Distributions." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306360901.

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23

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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24

Ferreira, Costa Levy [Verfasser]. "Modular Power Converters for Smart Transformer Architectures / Levy Ferreira Costa." Kiel : Universitätsbibliothek Kiel, 2019. http://d-nb.info/1197055312/34.

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25

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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26

Horridge, Paul. "Propagation of power line carrier signals through the distribution transformer." Thesis, Open University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389900.

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27

Rhodes, Scott A. (Scott Adrian). "The effects of separable cores on high power transformer design." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41419.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.<br>Includes bibliographical references (p. 157-159).<br>by Scott A. Rhodes.<br>M.Eng.

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28

Sihite, Josep Franklin. "Failure Analysis of Power Transformer Based on Fault Tree Analysis." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/180498.

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29

Dalarsson, Mariana. "Online power transformer diagnostics using multiple modes of microwave radiation." Licentiate thesis, KTH, Elektroteknisk teori och konstruktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129766.

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In the present thesis, we propose and investigate a new approach to diagnose the effects of the various degradation mechanisms, including thermal degradation at hot spots, winding deformations due to the mechanical forces from short circuit currents, partial discharges due to local electric field surges, and increased moisture levels in the cellulose insulation due to decomposition, that affect electric power transformers during their normal operation in an electric power grid. Although the proposed diagnostics method can in principle be used to detect various degradation mechanisms mentioned

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30

Sucena, Paiva Camelo Tomás. "Risk Index for High Power Transfromers." Thesis, KTH, Kraft- och värmeteknologi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-172839.

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The Risk Index is a useful tool which allows quick conclusions regarding the possibility of something going wrong with a specific device or situation. In this work, the devices are high power transformers belonging to a specific company. This company is EDP Renováveis (EDPR) which develops, manages and maintains wind farms with a total installed capacity of 9,036 MW (at the end of 2014), in ten countries located in Europe, North America and Brazil. Each of these wind farms has a substation with, at least, one high power transformer. High power transformers are expensive devices and are crucial

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31

Greenwood, Howard. "Aspects of the chemistry of carbon dioxide cooled nuclear power power reactors." Thesis, University of Salford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384859.

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32

Hamzeh, Bahmani Hamed. "Development of novel techniques for the assessment of inter-laminar resistance in transformer and reactor cores." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/69860/.

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The main aim of this project is to investigate the influence of the inter-laminar short circuit faults on the performance of magnetic cores and develop a non-destructive method to detect these kinds of defects. The eddy current path in magnetic laminations which is magnetised by time varying magnetic field was modelled by an equivalent resistor network to calculate and predict the eddy current power losses in magnetic laminations. The model was validated over a wide range of magnetisation conditions. Based on the developed model, the influence of a wide range of magnetising frequency and peak

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33

Frimpong, George Kwabena. "Acoustic detection and location of partial discharges in power transformer tanks." Diss., Georgia Institute of Technology, 1994. http://hdl.handle.net/1853/15708.

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34

Li, Jie. "High frequency power transformer modelling for frequency response analysis (FRA) diagnosis." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538489.

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Transformer fault diagnosis through Frequency Response Analysis (FRA) has been receiving a great deal of attention in recent years. As a comparative technique, FRA has good capability and sensitivity in detecting mechanical faults that are difficult to identify by conventional condition assessment techniques. Power transformers are among the most expensive equipment owned by electric utilities, and it is not reasonable to produce deformation on actual transformers and carry out measurement sensitivity studies. On the other hand, simulation models, which can accurately reproduce transformer hig

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35

Mahmud, Shekhar. "Influence of contamination on the electrical performance of power transformer oil." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/379273/.

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Transformer failure statistics from all over the world showed that almost 30% of them were due to insulation. Large amount of those failures were due to particles in transformer oil. Main focus of this research is to effects of contamination on electrical performance of transformer oil. A literature review of major causes of transformer failure, breakdown mechanisms of transformer oil has been conducted. The experimental setup and results from the pressboard-dust-contaminated transformer mineral oil test are also discussed. Several experiments have been carried out with cellulose particle cont

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36

Wang, Zhenyuan. "Artificial Intelligence Applications in the Diagnosis of Power Transformer Incipient Faults." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28594.

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This dissertation is a systematic study of artificial intelligence (AI) applications for the diagnosis of power transformer incipient fault. The AI techniques include artificial neural networks (ANN, or briefly neural networks - NN), expert systems, fuzzy systems and multivariate regression. The fault diagnosis is based on dissolved gas-in-oil analysis (DGA). A literature review showed that the conventional fault diagnosis methods, i.e. the ratio methods (Rogers, Dornenburg and IEC) and the key gas method, have limitations such as the "no decision" problem. Various AI techniques may help solv

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37

Tinsley, Carl Terrie III. "Modeling of Multi-Pulse Transformer/Rectifier Units in Power Distribution Systems." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/34655.

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Multi-pulse transformer/rectifier systems are becoming increasingly popular in power distribution systems. These topologies can be found in aircraft power systems, motor drives, and other applications that require low total harmonic distortion (THD) of the input line current. This increase in the use of multi-pulse transformer topologies has led to the need to study large systems composed of said units and their interactions within the system. There is also an interest in developing small-signal models so that stability issues can be studied. This thesis presents a procedure for the aver

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38

Moodley, Nadarajan. "Power transformer health assessment derived from low energy and dissolved parameters." Doctoral thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/5154.

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Includes abstract.<br>Includes bibliographical references.<br>This dissertation studied the mechanisms of transformer health in terms of energy and dissolved parameters and establishes a novel method to identify a trigger for a change in transformer condition from normal to defective state. The study took the form of both analytic research to create a low energy degradation model and then empirical testing of the model on field data in the form of dissolved gas analysis as recorded from 201 GSU transformers that have either failed or are presently in service.

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39

Davoodi, Samirmi Farhad. "Multi-agent and knowledge-based system for power transformer fault diagnosis." Thesis, University of Liverpool, 2013. http://livrepository.liverpool.ac.uk/14455/.

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Transformer reliability and stability are the key concerns. In order to increase their efficiency, an automatic monitoring and fault diagnosing of the power transformers are required. Dissolved Gas Analysis (DGA) is one of the most important tools to diagnose the condition of oil-immersed transformer. Agents technology as a new, robust and helpful technique, successfully applied for various applications. Integration of the Multi-Agent System (MAS) with knowledge base provides a robust system for various applications, such as fault diagnosis and automated actions performing, etc. For this purpo

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40

Zhong, Qi. "Power transformer end-of-life modelling : linking statistics with physical ageing." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/power-transformer-endoflife-modelling-linking-statistics-with-physical-ageing(72704cee-d413-4c67-abf3-51c0195fc3cb).html.

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Investment decisions on electric power networks have developed to balance network functionality and cost efficiency by analyzing the main risks associated with network operation. Ageing infrastructures, like large power transformers in particular, aggravate the stress of management, because the failure of a power transformer could cause power supply interruption, network reliability reduction, large economic losses and also environment impacts. Transformer asset management is therefore aimed to develop a cost-efficient replacement strategy to get the most usage of transformers. The main object

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41

Peng, Jinsheng. "Assessment of transformer energisation transients and their impacts on power systems." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/assessment-of-transformer-energisation-transients-and-their-impacts-on-power-systems(c32615d7-45c5-4eae-8465-62be67890adc).html.

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Transformers are essential components facilitating transmission and distribution of electric power. Energisation of transformers, however, can cause core operating at deep saturation region and thereby induce transient inrush currents of high magnitude and with rich harmonics. This can lead to undesirable effects including potential damage to the transformer itself, relay mal-operation, harmonic resonant overvoltages, and reduced power quality in the system (mainly in the form of voltage dips). This thesis investigates voltage dips caused by energising generator step-up (GSU) transformers and

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42

Ribbenfjärd, David. "Electromagnetic transformer modelling including the ferromagnetic core." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13080.

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In order to design a power transformer it is important to understand its internal electromagnetic behaviour. That can be obtained by measurements on physical transformers, analytical expressions and computer simulations. One benefit with simulations is that the transformer can be studied before it is built physically and that the consequences of changing dimensions and parameters easily can be assessed. In this thesis a time-domain transformer model is presented. The model includes core phenomena as magnetic static hysteresis, eddy current and excess losses. Moreover, the model comprises windi

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Wu, Zhongyu. "Synchronized Phasor Measurement Units Applications in Three-phase Power System." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/51660.

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Phasor Measurement Units (PMUs) are widely acknowledged as one of the most significant developments in the field of real-time monitoring of power system. By aligning time stamps of voltage and current phasor measurements, which are consistent with Coordinated Universal Time (UTC), a coherent picture of the power system state can be achieved through either direct measurements or simple linear calculations. With the growing number of PMUs installed or planned to be installed in the near future, both utilities and research institutions are looking for novel applications of synchrophasor measureme

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44

Bergsåker, Claudia. "Impact of transformer core size on the reactive power requirement of power transformers due to GIC." Thesis, KTH, Elektroteknisk teori och konstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157347.

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Geomagnetically induced currents (GIC) are a natural phenomenon which arises due to solar storms. During a solar storm, large amounts of magnetized plasma are ejected from the surface of the sun. When this plasma reaches earth, it causes fluctuations in the geomagnetic field. Such 　fluctuations may induce DC over-currents in long transmission lines. These currents affect the transmission system several dierent ways; In particular high voltage transformers are sensitive to GIC. When the over-current flows through the transformer windings the reactive power absorption of the transformer increase

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45

"Enhanced voltage regulation in lightly-loaded, meshed distribution networks using a phase shifting transformer." Thesis, 2013. http://hdl.handle.net/10210/8398.

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M.Ing. (Electrical and Electronic Engineering)<br>Long transmission lines in power system require high line loading in order to lower voltage limits due to line losses. For relatively long lines, line charging is high and thus higher voltage limits reached at low loading. It follows then that it is a challenge to maintaining the voltages between the acceptable limits for relatively long lines. This dissertation highlights the problems experienced when load varying from very low to very high is supplied by very long parallel lines of different impedance characteristic. When the load is extremel

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Koenig-Barron, Matthew. "The Emergence and Compensation of Reactive Power in the North Western Province of Zambia." Thesis, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331765.

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The design of a transmission project is as varied in the factors that affect it as the people to which the project supplies electricity. This thesis focuses on the theoretical considerations in the design process that affect the emergence of reactive power in a system and how reactive compensation is achieved. It examines the place of theoretical concepts in reality by expounding on a field study on the construction of a new transmission power system connecting the North Western Province (NWP) of Zambia to the national grid. The thesis provides colour to these grey theoretical concepts in the

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47

Alamry, Hamed, and Ahmed Alyousef. "Electrical power transformer." Thesis, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13254.

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48

Soares, Miguel Sérgio Vieira Correia. "Power Transformer Asset Management - Pracana Case Study." Dissertação, 2017. https://repositorio-aberto.up.pt/handle/10216/106858.

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The power transformers comprise a great investment.The owners of this type of asset have a growing demand to extend the life of their transformer fleets. In this work, an analysis of the asset management and associated norms is made.In addition, power transformers are analyzed and their key parameters as well as the existing monitoring techniques and systems.A comparative analysis is made between health index calculation models that allow the evaluation of the condition of a power transformer.A health index is a tool that processes information by creating a score that describes the condition o

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49

Aoki, Ichiro. "Distributed active transformer for integrated power amplification." Thesis, 2002. https://thesis.library.caltech.edu/2129/1/Aoki_i_2002.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by {...]. Abstract is included in .pdf document. A novel on-chip impedance transformation and power-combining technique, the distributed active transformer (DAT) is introduced. It overcomes the fundamental difficulties presented by silicon technology in the design of integrated rf power amplifiers. This technique efficiently combines several low-voltage push-pull amplifiers and simultaneously performs an impedance transformation to produce a larger output power while maintaining a [...] match. It also uses virtual ac grounds

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Li, Ruei-Jhang, and 李瑞璋. "Life Assessment of Oil Immerged Power Transformer." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/69548780705928183693.

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Abstract:

碩士<br>臺北城市科技大學<br>資訊應用產業碩士專班<br>102<br>In general, the life expectancy of a power transformer is about 35 to 40 years. During operation of a power transformer, the various types of faults can be detected from gases in the insulating oil by using the dissolved gas analysis (DGA) diagnostic technology. The volume of these “fault gases” may effectively identify and represent the different conditions of transformer fault. Important information can be obtained after analysis of the integrated fault gases data. According to these data is helpful to draw out the life assessment curve of the transform

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