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Dissertations / Theses on the topic 'Transformer connections'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Lorber, Christa Kaye. "Modeling of open bank disturbution transformer connections." Thesis, This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06082009-171138/.

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2

Costa, Lucas Araujo da. "Estudo da influência da conexão e aterramento de transformadores trifásicos em variações de tensão de curta duração." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/180858.

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Sendo as interrupções, os afundamentos de tensão e as sobretensões distúrbios de Qualidade de Energia Elétrica (QEE) com potencial de grande impacto econômico, estudos que procuram alternativas de mitigação de seus efeitos ou prevenção de sua ocorrência têm sido amplamente realizados nas últimas décadas. Uma das metodologias de avaliação de sua ocorrência é realizada pela predição, que geralmente se concentra em simulações de faltas em parcelas de sistemas elétricos de potência. Nos Procedimentos de Distribuição de Energia Elétrica no Sistema Elétrico Nacional (PRODIST), encontra-se a denomina

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Szabo, Szilard. "Nahm transform for integrable connections on the Riemann sphere." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. http://www.theses.fr/2005STR13072.

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4

Cekić, Mihajlo. "The Calderón problem for connections." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/267829.

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This thesis is concerned with the inverse problem of determining a unitary connection $A$ on a Hermitian vector bundle $E$ of rank $m$ over a compact Riemannian manifold $(M, g)$ from the Dirichlet-to-Neumann (DN) map $\Lambda_A$ of the associated connection Laplacian $d_A^*d_A$. The connection is to be determined up to a unitary gauge equivalence equal to the identity at the boundary. In our first approach to the problem, we restrict our attention to conformally transversally anisotropic (cylindrical) manifolds $M \Subset \mathbb{R}\times M_0$. Our strategy can be described as follows: we con

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5

Apelfröjd, Senad. "Grid Connection of Permanent Magnet Generator Based Renewable Energy Systems." Doctoral thesis, Uppsala universitet, Elektricitetslära, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304659.

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Renewable energy is harnessed from continuously replenishing natural processes. Some commonly known are sunlight, water, wind, tides, geothermal heat and various forms of biomass. The focus on renewable energy has over the past few decades intensified greatly. This thesis contributes to the research on developing renewable energy technologies, within the wind power, wave power and marine current power projects at the division of Electricity, Uppsala University. In this thesis grid connection of permanent magnet generator based renewable energy sources is evaluated. A tap transformer based grid

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Styliaras, Nikolaos. "INVESTIGATION OF THE EFFECT OF THE TRANSFORMER CONNECTION TYPE ON VOLTAGE UNBALANCE PROPAGATION: CASE STUDY AT NÄSUDDEN WIND FARM." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318969.

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The objective of this Thesis is to investigate the phenomenon of voltage unbalance on electrical wind power systems. A large part of this work is the literature review of all relative work that has been done so far. This serves first as a guideline to define and measure voltage unbalance and second as a tool to spot open research questions that can inspire future work. A case study is then used to investigate the voltage unbalance at a wind farm in Näsudden, Gotland. Using real-time measurements and a simulation of the power system in MATLAB/Simulink, an evaluation of the propagation of the vo

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Pálka, Marek. "Analýza spojů proudovodiče při měření proudu ve VN aplikacích." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242142.

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The main focus of the dissertation thesis is determine the size of the fastening screw connection and fastening torque of the connection, which will be applied during assembly of the instrument current transformers and sensors. The large part of thesis is an experimental measurement of the proposed configurations of connections and modelling (simulating) certain model of connections in Ansys and SolidWorks analysis programs. The result of the dissertation will be design of tightening of the connection according to transient resistance and thermal losses.

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Vrtal, Matěj. "Konceptuální rozvoj lokální distribuční soustavy Prototypa, a.s." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413217.

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This thesis is focused on the opportunities of conceptual development of the local distribution system Prototypa, a.s. At first, there is descripted condition of the current substations and internal electricity distribution system. Practical part of the thesis is dedicated to the evaluation of the construction of new transformer station and projection proposals of connection of the high-power charging station and new electric power supply.

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Ion, Maricica-Mirela. "Amélioration de la sélectivité des protections électriques des navires lors de l'alimentation à quai - Augmentation du courant de court-circuit." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT004/document.

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Ce travail est relatif à l’augmentation du courant de court-circuit du réseau électriqueportuaire alimentant le navire. Ceci passe par une modélisation des réseaux des charges, dutransformateur et enfin convertisseurs concernés. Munis de cette compréhension du système,diverses solutions à base d’électronique de puissance ou d’éléments passifs ont étéinvestiguées, simulées et évaluées à l’aune des performances exigées. Pour l’augmentation ducourant de court-circuit, un transformateur spécialement créé pour cette application à deuxenroulements primaires est proposé. L’esprit de la solution est d

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Padua, Marcelo Suzart de. "Tecnicas digitais para sincronização com a rede eletrica, com aplicação em geração distribuida." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/261848.

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Orientadores: Sigmar Maurer Deckmann, Fernando Pinhabel Marafão<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-07T20:09:32Z (GMT). No. of bitstreams: 1 Padua_MarceloSuzartde_M.pdf: 2971342 bytes, checksum: f838d91f23e156c63fa9582c9c5c582e (MD5) Previous issue date: 2006<br>Resumo: Este trabalho visa contribuir para os estudos sobre sincronismo em um Sistema Elétrico de Potência (SEP), com enfoque em Geração Distribuída (GD). Buscar-se-á analisar as condições para operação de um gerador dis

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11

Petersson, Björn. "Design av mikrovågsövergångar." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1593.

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<p>In this Master thesis, microwave connections between circuit boards are constructed. The primary frequency band is the X-band (8-12 GHz). The purpose of the connections is to enable a more simple and cheaper way of mounting the circuit boards inside a container. </p><p>The connections have been designed and evaluated, using different computer programs. A few prototypes have been built and measured. </p><p>The main goal of this Master thesis was to design a connection, that would be useful in practice. The connections should be easy to manufacture and have a good performance. They should als

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Ekström, Amelie, and Jessica Wänlund. "Nätanslutning av en framtida elväg : En kartläggning av anslutningsmöjligheter för E4an mellan Gävle och Stockholm." Thesis, Uppsala universitet, Elektricitetslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-439941.

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The transport sector accounts for a third of Sweden’s total greenhouse gas emissions where cars and heavy trucks dominate the use of fossil fuels. The Swedish government is now intensifying the work for an electrified transport sector where electric roads could be an important part. Electric roads enable heavy vehicles to charge their batteries while driving, which is expected to contribute to environmentally friendly and time-efficient freight transports. To implement electric roads, availability of electric power along the electric roads will be required. This study presents a plan for conne

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Wänlund, Jessica, and Amelie Ekström. "Nätanslutning av en framtida elväg : En kartläggning av anslutningsmöjligheter för E4an mellan Gävle och Stockholm." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-439942.

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The transport sector accounts for a third of Sweden’s total greenhouse gas emissions where cars and heavy trucks dominate the use of fossil fuels. The Swedish government is now intensifying the work for an electrified transport sector where electric roads could be an important part. Electric roads enable heavy vehicles to charge their batteries while driving, which is expected to contribute to environmentally friendly and time-efficient freight transports. To implement electric roads, availability of electric power along the electric roads will be required. This study presents a plan for conne

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14

Michl, Pavel. "Začleňování fotovoltaických elektráren do elektrizační soustavy." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218537.

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The thesis discuses an integration of photovoltaic power stations to electric network. The first part describes connecting conditions of small sources to distribution system, including administrative requirements, feasibility study, and requirements to the energy meters, measuring, control devices, switching devices and protection. The second part is aimed to describe problems of the photovoltaic system. Solar radiation generating and reducing of its intensity incident upon the earth surface are described in this part. The quantum of produced electric power depends on climatic conditions in th

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15

Chang, Sung-Chieh, and 張松傑. "Transformer Load Connection and Loss Reduction for Distribution Feeder Circuits." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/54919421652724020241.

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碩士<br>國立中山大學<br>電機工程研究所<br>85<br>Phase unbalance is one of the prime reasons to cause extra line loss and ground relay tripping in the distribution system. In Taiwan, the feeder unbalance introduced by the open wye-open delta transformers could be one of the most serious reason for feeder imbalance in a practical three phase distribution system. Many researchs used feeder reconfiguration and capacitor placement to minimize power loss. This research tries to minimize power loss by changing the prime phase sequencing of the open wye-open delta transformers to. Studies of changing the prim

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16

蘇華宗. "Study of connections characteristics on on-load tap changer for transformers." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/29738444432703559850.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>92<br>In order to ensure voltage quality during operations in the power systems, the On-Load Tap Changer (OLTC) for transformer were used to keep the voltage output stable. The paper discussed and analyzed the potential distribution along the transformer winding by using an impulse voltage applied across the winding. The distribution of impulse voltage on the OLTC at different taps and connections of 69 kV transformer windings has been simulated by using a voltage oscillation analysis program. The simulation results verify the causes of failures at the different conn

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CHEN, HSING-CHUAN, and 陳星銓. "A Study on Novel Transformers for Yacht Shore Power Connection." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/78923011173656963423.

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18

Chung-Li, Wu, and 吳忠吏. "Study on the Best Connections Between Distribution Transformers and a Primary Feeder." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/96238306482521924531.

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碩士<br>國立臺灣科技大學<br>電機工程技術研究所<br>86<br>This thesis presents many algorithms for perfecting the connections between distribution transformers and a primaryfeeder to improve the imbalance as well as the operationefficiency of a distribution feeder. Four Taipower distribution feeders were used to verify the validity of the proposed algorithms. The results indicate that three-phase voltages, currents and loads imbalances along a feeder as well as thevoltage drop, line losses and the frequence of malfunction ofgrounding relay can be effectively reduced. Consequently, the power quality of a distributi

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19

Saravanakumar, A. "Terminal Connection And System Function For Making Sweep Frequency Response Measurements On Transformers." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/739.

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Sweep Frequency Response (SFR) measurement on a transformer is a low voltage, offline exercise. So, it virtually permits determination of any network or system function, by imposing any desired terminal condition for the nontested windings and terminals. The terminal conditions employed have significant influence on the achievable fault detection ability, and maximizing this ability should obviously be one of the main aims of frequency response measurements. Simply stated, this requirement translates to the ability to identify/measure as many natural frequencies as possible. However, there is

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20

Saravanakumar, A. "Terminal Connection And System Function For Making Sweep Frequency Response Measurements On Transformers." Thesis, 2008. http://hdl.handle.net/2005/739.

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Sweep Frequency Response (SFR) measurement on a transformer is a low voltage, offline exercise. So, it virtually permits determination of any network or system function, by imposing any desired terminal condition for the nontested windings and terminals. The terminal conditions employed have significant influence on the achievable fault detection ability, and maximizing this ability should obviously be one of the main aims of frequency response measurements. Simply stated, this requirement translates to the ability to identify/measure as many natural frequencies as possible. However, there is

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21

Dong, Mu-Lin, and 董穆林. "Optimal connection of distribution transformers along a feeder for minimizing load unbalance." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/06623498937524409382.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>87<br>This thesis aims to determine the optimal connections of distribution transformers along a feeder and their construction sequence for minimizing load unbalance. A multi-objective formulation for the above problem is first presented. Several important objectives are considered with emphasis on the current passing through the LCO relay (Low Energy Over Current Relay) equipped in substation because phase unbalance can cause the LCO relay to trip abnormally. A normalized weighting method for multi-objective problem is then proposed, which can provide a best comprom

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22

Liu, Chien-Hung, and 劉建宏. "Design and Implementation of Interleaved Resonant Converter with Series-Parallel Transformers Connection." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03003579777400907500.

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碩士<br>國立雲林科技大學<br>電機工程系碩士班<br>100<br>This paper presents an interleaved pulse-width modulation (PWM) LLC resonant converter with series-parallel connected application. The secondary windings of isolated transformers are connected in series-parallel. Thus the leakage inductance currents at the primary sides and the diode currents at the secondary sides are forced to be balanced. Based on the resonant behavior by the output capacitance of MOSFETs and the leakage inductance of transformers, active switches can be turned on at zero voltage switching (ZVS) and recitifier diodes can be turned off at

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23

張棟梁. "Harmonic reduction for three-phase inverter based on zig-zag transformer connection and selected harmonic elimination." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/75704156460598939909.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>93<br>The purpose of this thesis is to implement an inverter based on Zig-Zag transformer connection and selected-harmonic elimination. By combining these two techniques, the inverter system can effectively eliminate lower order harmonic components with lower carrier frequency. The notch angles required by the selected-harmonic elimination method are pre-calculated as a function of fundamental component through numerical method. Consequently, a look-up table is established in a DSP-based digital controller, thus the tedious calculations of solving the notch angles ar

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24

Wei-ShengLiu and 劉威盛. "Improvement of Three-phase Voltage Unbalance Characteristics Due to U-V/V-V Connections of Transformers Using a D-STATCOM." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/27641960399058856500.

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碩士<br>國立成功大學<br>電機工程學系<br>104<br>The U-V or V-V winding connection of two single-phase distribution transformers is widely used in most utility companies including Taiwan Power Company (TPC) to deliver power to various three-phase loads. Such special winding connection can cause three-phase voltage unbalance which leads to the trip of ground relay, extra power loss on distribution lines, and reduced efficiency of induction motors. This thesis proposes a distributed static synchronous compensator (D-STATCOM) to decrease the voltage unbalance due to U-V or V-V winding connection of distribution

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25

Su-JenChen and 陳恕增. "Power Flow Control and Stability Analysis of a Microgrid Connection Interface Connected between Two Grids Using a Variable Frequency Transformer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/01645911197774757520.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>98<br>The aim of this thesis is to use a variable frequency transformer (VFT) as a microgrid connection interface (MCI) to connect two grids. The two grids are the Taipower grid and a microgrid that includes a self-excited induction generator (SEIG) and a local load. The core of the proposed VFT is a wound-rotor induction motor driven by a squirrel-cage induction motor while both sides of the VFT are connecting with compensation capacitors. Two operation modes, the manual mode and the automatic mode, are employed to control the active power flow of the two grids.

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26

Wu, Bo Jin, and 吳柏縉. "The Wavelet Transform Method on Synchronization of Networks of Coupled Chaotic Systems with Asymmetrical Sparse Connection Topology." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/23528602384466290182.

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碩士<br>國立新竹教育大學<br>應用數學系碩士班<br>101<br>The wavelet transform method [15,16,17,18,28,33] is an effective tool to enhance the transverse stability of the synchronous manifold of a coupled chaotic system. Much of the theoretical study on this matter is centered on the networks being symmetrically coupled. However, in real applications, the coupling topology of a network is often asymmetric [3,4,5,12,19,37]. In this paper, a certain type of asymmetric sparse connection topology for networks of coupled chaotic systems is presented. Moreover, our work here represents the first step in understanding ho

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