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Dissertations / Theses on the topic 'Current transformer'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

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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2

Okubo, Hitoshi, Masahiro Hanai, Naoki Hayakawa, Hiroki Kojima, and John Himbele. "Current limitation and recovery function for superconducting fault current limiting transformer (SFCLT)." Elsevier, 2012. http://hdl.handle.net/2237/20733.

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3

Etumi, Adel. "Current signal processing-based techniques for transformer protection." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/94716/.

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Transformer is an expensive device and one of the most important parts in a power system. Internal faults can cause a transformer to fail and thus, it is necessary for it to be protected from these faults. Protection doesn’t mean that it prevents damage to the protected transformer but it is to minimize the damage to the transformer as much as possible, which consequently minimizes the subsequent outage time and repair cost. Therefore, fast and reliable protection system should be used for limiting damages to the transformer by rapidly disconnecting the faulty transformer from the network, whi

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4

Solh, Joukhah Zahra. "Operation of HVDC converters for transformer inrush current reduction." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461569.

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The present PhD thesis deals with transformer inrush current in offshore grids including offshore wind farms and High Voltage Direct Current (HVDC) transmission systems. The inrush phenomenon during transformers energization or recovery after the fault clearance is one of important concerns in offshore systems which can threaten the security and reliability of the HVDC grid operation as well as the wind farms function. Hence, the behaviour of wind turbines,Voltage Source Converters (VSC) and transformer under the normal operation and the inrush transient mode is analyzed. For inrush current

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5

Li, Xiang. "Mathematical Model for Current Transformer Based On Jiles-Atherton Theory and Saturation Detection Method." UKnowledge, 2016. http://uknowledge.uky.edu/ece_etds/89.

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Current transformer saturation will cause the secondary current distortion. When saturation occurs, the secondary current will not be linearly proportional to the primary current, which may lead to maloperation of protection devices. This thesis researches and tests two detecting methods: Fast Fourier Transform (FFT) and Wavelet Transform based methods. Comparing these two methods, FFT has a better performance in steady state saturation, and Wavelet Transform can determine singularity to provide the moment of distortion. The Jiles-Atherton (J-A) theory of ferromagnetic hysteresis is one approa

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6

Kurupakorn, C., H. Kojima, N. Hayakawa, et al. "Recovery characteristics after current limitation of high temperature superconducting fault current limiting transformer (HTc-SFCLT)." IEEE, 2005. http://hdl.handle.net/2237/6773.

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7

Okubo, Hitoshi, Masahiro Hanai, Naoki Hayakawa, Toyoaki Kito, Masashi Kotari, and Hiroki Kojima. "Current Limiting and Recovery Characteristics of 2 MVA Class Superconducting Fault Current Limiting Transformer (SFCLT)." IEEE, 2011. http://hdl.handle.net/2237/20727.

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8

Sham, Jit Kumar. "High Temperature Superconducting Partial Core Transformer and Fault Current Limiter." Thesis, University of Canterbury. ELECTRICAL AND COMPUTER ENGINEERING, 2015. http://hdl.handle.net/10092/10519.

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The thesis begins with an introduction to transformer theory. The partial core transformer is then introduced and compared with a full core design. A brief introduction to superconductors and high temperature superconductors is then presented. High temperature superconducting fault current limiters are then examined and the advantage of a high temperature superconducting partial core transformer and fault current limiter as a single unit is highlighted. The reverse design model is discussed followed by the model parameters that are used in designing the high temperature superconducting partial

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9

Okubo, Hitoshi, Masahiro Hanai, Hiroki Kojima, and Naoki Hayakawa. "Progress in Development of Superconducting Fault Current Limiting Transformer (SFCLT)." IEEE, 2011. http://hdl.handle.net/2237/20728.

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10

Ammanambakkam, Nagarajan Dhivya. "Design of HF Forward Transformer Including Harmonic Eddy Current Losses." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1292874300.

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11

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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12

Prasantanakorn, Chanwit. "Current Sharing Method for DC-DC Transformers." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/31112.

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An ever present trend in the power conversion industry is to get higher performance at a lower cost. In a computer server system, the front-end converter, supplying the load subsystems, is typically a multiple output power supply. The power supply unit is custom designed and its output voltages are fully regulated, so it is not very efficient or cost effective. Most of the load systems in this application are supplied by point-of-load converters (POLs). By leaving the output voltage regulation aspect to POLs, the front-end converter does not need to be a fully regulated, multiple output conver

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13

Omura, Koki, Hiroki Kojima, Naoki Hayakawa, Fumihiro Endo, Mathias Noe, and Hitoshi Okubo. "Current Limiting Characteristics of Parallel-Connected Coated Conductors for High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT)." IEEE, 2009. http://hdl.handle.net/2237/13939.

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14

Okubo, H., M. Hanai, H. Kojima, T. Kito, and N. Hayakawa. "Analysis of Current Limiting and Recovery Characteristics of Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors." IEEE, 2011. http://hdl.handle.net/2237/20730.

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15

Okubo, H., C. Kurupakorn, S. Ito, et al. "High-Tc Superconducting Fault Current Limiting Transformer ( HTc-SFCLT ) With 2G Coated Conductors." IEEE, 2007. http://hdl.handle.net/2237/9625.

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16

zhou, hua. "MAGNETICS DESIGN FOR HIGH CURRENT LOW VOLTAGE DC/DC CONVERTER." Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3381.

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With the increasing demand for small and cost efficient DC/DC converters, the power converters are expected to operate with high efficiency. Magnetics components design is one of the biggest challenges in achieving the higher power density and higher efficiency due to the significant portion of magnetics components volume in the whole power system. At the same time, most of the experimental phenomena are related to the magnetics components. So, good magnetics components design is one of the key issues to implement low voltage high current DC/DC converter. Planar technology has many advantages.

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17

Kito, Y., H. Okubo, N. Hayakawa, Y. Mita, and M. Yamamoto. "Development of a 6600 V/210 V kVA hybrid-type superconducting transformer." IEEE, 1991. http://hdl.handle.net/2237/6880.

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18

Chisepo, Hilary Kudzai. "Measurements and finite element modelling of transformer flux with dc and power frequency current." Doctoral thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/31218.

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Geomagnetically induced currents (GIC’s) caused by solar storms or other sources of dc excitation in the presence of ac energization can disturb the normal operation of power transformers. If large enough, they cause half-cycle saturation of a power transformer’s core which could lead to overheating due to excessive stray flux. Finite element matrix (FEM) modelling software is of considerable use in transformer engineering as it is able to solve electromagnetic fields in transformers. For many problems, typically involving only specific parts of a transformer, fairly accurate solutions can be

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19

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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20

Hayakawa, N., H. Kagawa, and H. Okubo. "A system study on superconducting fault current limiting transformer (SFCLT) with the functions of fault current suppression and system stability improvement." IEEE, 2001. http://hdl.handle.net/2237/6749.

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21

McClusky, Scott Logan. "HIGH VOLTAGE RESONANT SELF-TRACKING CURRENT-FED CONVERTER." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/254.

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High voltage power supply design presents unique requirements, combining safety, controllability, high performance, and high efficiencies. A new Resonant Self-Tracking Current-Fed Converter (RST-CFC) is investigated as a proof-of-concept of a high voltage power supply particularly for an X-ray system. These systems require fast voltage rise times and low ripple to yield a clear image. The proposed converter implements high-frequency resonance among discrete components and transformer parasitics to achieve high voltage gain, and the self-tracking nature ensures operation at maximum gain while p

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22

Šumberák, David. "Přístrojový transformátor proudu 12kV, 4000//5/5A." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220954.

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This master´s thesis describes the development proposal and production of instrument current transformer in one turn primary winding with 4000//5/5 A transfer. The thesis involves a theoretical analysis, a numerical calculation, a developmental 3D model, corresponding simulations and a standard testing of the transformers. There is a complete written description of measuring current transformer cycle from the development to the production. The transformer development and production works were collaborated with the company KPB Intra s.r.o. The company engages in development, production and sale

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23

Bálint, Zoltán. "Průvlekový transformátor proudu 25 kV, 400/5/5 A." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217917.

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The aim of this master’s thesis is the design of a double-core bushing-type current transformer. This appliance is intended for measuring and protection of high-voltage distribution systems of the internal type for the highest system voltage of 25 kV. The master’s thesis is divided into four parts. The first part describes the function of the current transformer. The next part deals with the analysis of the phasor diagram and errors of the current transformer. The major part of the thesis deals with the design of the protective and measuring core. The last part describes the 3D model of the bu

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24

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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25

Okubo, H., F. Endo, N. Hayakawa, H. Kojima, and M. Kotari. "Development of 2 MVA Class Superconducting Fault Current Limiting Transformer (SFCLT) with YBCO Coated Conductors." IOP Publishing, 2010. http://hdl.handle.net/2237/20724.

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26

Yan, Ning. "High-frequency Current-transformer Based Auxiliary Power Supply for SiC-based Medium Voltage Converter Systems." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/101507.

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Auxiliary power supply (APS) plays a key role in ensuring the safe operation of the main circuit elements including gate drivers, sensors, controllers, etc. in medium voltage (MV) silicon carbide (SiC)-based converter systems. Such a converter requires APS to have high insulation capability, low common-mode coupling capacitance (Ccm ), and high-power density. Furthermore, considering the lifetime and simplicity of the auxiliary power supply system design in the MV converter, partial discharge (PD) free and multi-load driving ability are the additional two factors that need to be addressed in t

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27

Vykoukal, Tomáš. "Měřicí transformátor proudu 2500/1 A pro soustavy s nejvyšším napětím 0,72 kV." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2019. http://www.nusl.cz/ntk/nusl-399564.

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This thesis deals with the description, analysis, calculation, production and testing of current instrument transformer. It is a measuring current transformer in one turn primary winding with 2500/1 A transfer. This project includes theory, analysis, numerical calculation, thermal simulation and partial type test of the measuring current transformer. This transformer is developing in cooperation with KPB Intra s.r.o. KPB Intra is engaged in the development and production of instrument transformers.

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28

Болюх, Є. П. "Розрахунок параметрів та моделювання системи електропостачання насосної станції". Master's thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/87280.

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У даній роботі виконано розрахунок навантажень, номінальних струмів, струмів короткого замикання, розрахунок втрат напруги. Вибрані кабелі та електрообладнання насосної станції. Для розрахунку навантажень взяті коефіцієнти з Державних будівельних норм В25-23-2003 Інженерне обладнання будинків і споруд (ДБН) та методика коефіцієнта попиту. Вибір кабелів та електрообладнання здійснено за допомогою таблиць перетину кабелю, взятих з Правил улаштування електроустановок (ПУЕ), номінального струму та навантаження. Розрахунки та моделювання проводились за допомогою програм: Mathlab, Мicrosoft Office

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29

Амонських, О. І. "Моделювання диференційного захисту силового трансформатора підстанції 110 кВ "КС-Суми"". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/71328.

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Розроблено та побудована в програмному комплексі PSCAD модель диференційного струмового захисту трансформатора. За допомогою розробленої моделі досліджено властивості диференційного струмового захисту трансформатора. Побудовано схеми для виявлення та блокування вищих гармонічних складових в струмах вторинних обмоток груп трансформаторів.

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30

Дядя, І. В. "Модернізація високовольтного обладнання підстанції 110/6 кВ". Master's thesis, Сумський державний університет, 2018. http://essuir.sumdu.edu.ua/handle/123456789/71252.

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Приведена загальна характеристика підстанції, виканоно: розрахунок струмів короткого замикання, вибір силових трансформаторів, а також трансформаторів для власних потреб підстанції, комутаційних апаратів, вимірювальних трансформаторів струму і напруги, ошиновки підстанції на стороні 110 і 6 кВ, аналіз небезпечних і шкідливих факторів, що впливають на персонал підстанції, розрахунок захисного заземлення підстанції, характеристика інформації як виробничого ресурсу підприємства, оцінка конкурентоспроможності підприємства, розрахунок економічного ефекту від заміни відокремлювачів і короткозамикачі

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31

Kurupakorn, C., N. Hayakawa, N. Kashima, et al. "Development of high temperature superconducting fault current limiting transformer (HT/sub c/-SFCLT) with Bi2212 bulk coil." IEEE, 2004. http://hdl.handle.net/2237/6750.

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32

Dragana, Naumović Vuković. "Prilog savremenom etaloniranju strujnih mernih transformatora." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=107383&source=NDLTD&language=en.

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U ovoj doktorskoj disertaciji prikazana je koncepcija, realizacija i potvrda nove metodejednovremenog etaloniranja strujnih mernih transformatora sa dve različite merneaparature. Pregledom stručne literature ne postoji podatak da je ova metoda ranijeprimenjivana. U disertaciji su prikazane različite merne metode za ispitivanje ietaloniranje mernih transformatora koje imaju primenu u savremenoj praksi i kojepodrazumevaju i različite merne mogućnosti. Takođe je i ekperimentalno potvrđenojednovremeno ispitivanje i etaloniranje strujnih mernih transformatora sa nekolikomernih aparatura koje su zas

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33

Kurupakorn, C., H. Kojima, N. Hayakawa, et al. "Simulation of electrical and thermal behavior of high temperature superconducting fault current limiting transformer (HTc-SFCLT)." Institute of Physics, 2006. http://hdl.handle.net/2237/9147.

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Vaheeshan, Jeganathan. "Transformer fault-recovery inrush currents in MMC-HVDC systems and mitigation strategies." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/transformer-faultrecovery-inrush-currents-in-mmchvdc-systems-and-mitigation-strategies(05f7a9ad-5967-47aa-b72c-e55ad1d33eb7).html.

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The UK Government has set an ambitious target to achieve 15% of final energy consumption from renewable sources by 2020. High Voltage Direct Current (HVDC) technology is an attractive solution for integrating offshore wind power farms farther from the coast. In the near future, more windfarms are likely to be connected to the UK grid using HVDC links. With the onset of this fairly new technology, new challenges are inevitable. This research is undertaken to help assist with these challenges by looking at possibilities of problems with respect to faster AC/DC interaction modes, especially, on t

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Okubo, H., M. Noe, F. Endo, N. Hayakawa, S. Ito, and H. Kojima. "Self-recovery Characteristics of High-Tc Superconducting Fault Current Limiting Transformer (HTc-SFCLT) with 2G Coated Conductors." IOP Publishing, 2008. http://hdl.handle.net/2237/20718.

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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 en

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Zhang, Lu. "Development of LCL DC/DC transformer and fault current limiting LCL VSC converter for high power DC networks." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=211240.

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In order to satisfy the huge demand energy transmission in future, the DC grid concept is proposed based on voltage sourced converter (VSC) HVDC and modular multilevel converter (MMC) HVDC technologies. It provides an attractive approach for long distance power transmission such as offshore renewable energy transmission in Europe. However, there are two main obstacles in the DC grid development. The first obstacle is the DC fault detection and selective isolation. Under severe fault condition, the DC grid is desired to isolate the healthy and faulty part which implies the whole grid system wil

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Bernardes, Alexandre Paciencia. "Um esquema completo de proteção diferencial de transformadores para testes em um relé digital." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-16072006-122259/.

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Este trabalho apresenta um procedimento completo de simulação da proteção digital diferencial aplicada a transformadores de potência, visando o emprego deste à avaliação do comportamento de relés comercialmente disponíveis. Foi escolhido o software ATP (Alternative Transients Program) como ferramenta para a simulação de distintas situações sobre um sistema diferencial de proteção aplicado a um transformador de 25 MVA. Dentre as ocorrências evidenciadas, destacam-se: situações de faltas internas, faltas externas, situações de energização e energização com falta interna do transformador, condiçã

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Palnikov, Ilya S. "Design and Experimental Investigation of 500kV Current Transformer Seismic Retrofit Utilizing Structure Rocking and Supplemental Damping with Self-Centering." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3673.

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Electrical substations perform a key role in electrical transmission and distribution; the ability for a substation to remain functional during and after a seismic event contributes significantly to the resilience of the clients supplied. Many legacy components currently installed in the main grid substations were designed with minimal consideration of lateral loads and are not qualified per IEEE693. One of the more critical high-voltage substation components that are vulnerable to earthquake damage is the 500kV freestanding current transformer (CT). The CT is particularly vulnerable due to th

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Bustamante, Mparsakis Xavier. "Fault location with travelling waves." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/266839.

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Travelling wave fault locators (TWFL) have the possibility to get rid of the limitation of typical locators based on the 50Hz impedance. Their principles were invented in the early 1900's, but only recently became economically viable. Some TWFL devices are now commercialized.Despite the recent commercialization of TW fault locators, actual field experience of TWFL is hard to acquire and rarely presented in the literature. Due to this, most studies are based on simplified simulation models.Practical experience in the form of TW records are important. It is the basis to understand the practical

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Wolf, Marko. "Design and implementation of a modular converter with application to a solid state transformer." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2773.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.<br>ENGLISH ABSTRACT: The purpose of a solid state transformer (SST) is to use power electronic converters to mimic the operation of the conventional distribution transformer. These power electronic converters are proposed to overcome the disadvantages of the conventional distribution transformer. The advantages of a SST include near perfect voltage regulation and harmonic isolation between the primary and secondary windings of the transformer. This thesis discusses the design and development of the

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42

Нора, К. О. "Розрахунок режиму роботи та реконструкція трансформаторної підстанції 35/10 кВ". Master's thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/87263.

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Розраховано параметри вибору основного високовольтного обладнання електричної підстанції за нормальними та аварійними режимами роботи; розраховано струми короткого замикання. Розрахунки проводились з допомогою програм: MatLab, Mathcad 14 , Microsoft Office Excel. Креслення за допомогою Brics CAD V15.

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Zelinková, Lenka. "Návrh stabilizovaného napájecího zdroje spínané koncepce." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219101.

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The thesis addresses the conceptual design and implementation of the switched-mode power supply having the adjustable dc voltage output up to 25V and current output up to 15A. The half-bridge topology is used for this supply. Design features and quantities are simulated in PSpice and Micro-Cap simulation tools. The thesis covers the simulation results, assembly data and the results measured on the implemented functional sample.

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Zimek, Alois. "Snímače střídavého a stejnosměrného proudu." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217921.

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The aim of this master’s thesis is to focus on analysis of a current transformer with feedback correction of measuring error, make an AC current sensor and verify its qualities experimentally. The measuring scale of this transformer is I = 0 to 100A, f = 50Hz.

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Villarruel-Parra, Alejandro. "Digital average-current control for the dual interleaved boost converter." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/digital-averagecurrent-control-for-the-dual-interleaved-boost-converter(5e08a493-7f23-4898-b391-d0d27bb09730).html.

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This Thesis addressed the challenge of ensuring balanced currents in the phases of a multi-kW, interleaved dc-dc converter by means of closed-loop digital control. The Thesis examines uniformly-sampled, valley-current, peak-current and average-current control for a dual interleaved boost converter with inter-phase transformer which might form part of the power train of an electric vehicle. Also, an enhancement of the average-current control is investigated in which the transistor duty-ratio is updated more rapidly, which allows an improvement of approximately ten times in the response speed of

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Мироненко, А. С. "Модернізація релейного захисту підстанції 110/10 кВ "Вузлова"". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/81989.

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Проведено аналіз стану електричного устаткування та релейного захисту і автоматики підстанції. Розраховані струми короткого замикання, вибрані вимірювальні трансформатори струму та напруги. Вибрано новий мікропроцесорний пристрій релейного захисту силових трансформаторів та приєднань, розглянуто особливості його приєднання до трансформаторів струму та вибору уставок. Розраховано уставки захистів силових трансформаторів від коротких замикань та перевантажень. Розраховано заземлюючий пристрій підстанції. У науковій частині проведено комп’ютерне моделювання пробою діелектрика за допомогою фрак

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Chiang, Arvin, and 姜義峰. "Current Transformer Saturation Detection Using Wavelet Transform." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/38630066492618497025.

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碩士<br>長榮大學<br>經營管理研究所<br>94<br>Digital protection relay for transmission lines utilizes voltage and current samples to discriminate faults in power system. Traditionally, current transformer (CT) is used to scale down the primary current to small secondary current for sampling. When a fault occurs on transmission lines, fault current contains an exponential decaying DC offset. It may cause the core of CT to saturate and result in distorted secondary current. Moreover, it results in a mal-operation in the protection relay. A CT saturation detection method is proposed in this thesis by analyzing

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HUANG, YU-FENG, and 黃鈺峰. "High Bandwidth Current Sensor with GMR and Current Transformer." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/355d82.

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碩士<br>國立臺北科技大學<br>機械工程系機電整合碩士班<br>107<br>In this study, a non-contact current detecting device was proposed by combining the Giant Magnetoresistive (GMR) and Current transformer(CT). Thus, the characteristics of GMR and CT can have complementary advantages. The GMR sensor can detect and sense low frequency current while CT can sense high frequency current. The combined system allows the current measurement bandwidth up to 130 kHz. This experiment assembled two single GMRs into a dual GMR sensor. The purpose was to subtract the insensitive odd harmonic signals of the sensor so that the back-end

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Liu, Chien-Chih, and 劉建志. "The Effects of Harmonics on Current Transformer and Differential Relay for Transformers." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/30803845673790025693.

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碩士<br>中原大學<br>電機工程學系<br>87<br>The use of nonlinear devices such as rectifiers ,converters, power supplies and other devices utilizing solid state switching has increased in industry during recent years. The power quality has been deteriorated by these equipments. This deterioration causes the increasing of power loss, resonance problem, insulation deterioration ,and even safety problem of system apparatus. This thesis aims at analyzing and probing into the influences of harmonics to differential relay. First it probes the operation of CT in frequency domain. Then, it analyzes and c

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ZHOU, CHUN-PU, and 周淳朴. "Design and implementation of direct current transformer." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/09061037576668843723.

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