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Dissertations / Theses on the topic 'Voltage index'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Karki, Sagar. "Effect of DERs on the Voltage Stability of Transmission Systems using a Voltage Stability Index." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/101783.

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Interconnection of DERs into the transmission lines is starting to take a substantial share of the total power capacity. Although the largest share of power generation attributes to coal and gas power plants, renewable energy is gradually increasing. However, in the past, the size of DERs was relatively smaller, and rooftop PV was the dominant renewable energy source. As a result, the studies for interconnection focused on those rooftop PVs on the distribution side. Since the scenario is slowly changing as more utilities increase the share of clean energy by building large-scale solar farms an

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2

Ziari, Iman. "Planning of distribution networks for medium voltage and low voltage." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46684/1/Iman_Ziari_Thesis.pdf.

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Determination of the placement and rating of transformers and feeders are the main objective of the basic distribution network planning. The bus voltage and the feeder current are two constraints which should be maintained within their standard range. The distribution network planning is hardened when the planning area is located far from the sources of power generation and the infrastructure. This is mainly as a consequence of the voltage drop, line loss and system reliability. Long distance to supply loads causes a significant amount of voltage drop across the distribution lines. Capacitors

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3

Kisch, Ryan John. "Using refractive index to monitor oil quality in high voltage transformers." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/5636.

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Insuring reliable operation of high voltage electrical equipment, such as transformers and cables, is of great importance to the power industry. This is done by monitoring the equipment. A large portion of this monitoring includes analyzing the quality of the insulating oils and observing various compounds formed in the oils during aging. Most often, transformer monitoring includes routine oil sampling and analysis, which has proven to be very effective at diagnosing faults and determining the insulation condition. Many techniques have been demonstrated for the purpose of online monitoring, an

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4

Hausner, Josef. "Index kvality napětí pro indikativní hodnocení kvality napětí v distribuční síti." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221201.

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This Master’s thesis deals with design of a new method for voltage quality benchmarking using voltage quality index. This index should determinate total voltage quality in the power grid and compare voltage quality in different places. There is design of several algorithms which value measured parameters in this thesis. The best suitable algorithm is selected. Program for this algorithm was compiled in GUI Matlab. The algorithm is verified by using measured parameters in this program. The last part of this thesis is focused on possible usage of created algorithm.

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5

Gong, Yanfeng. "Development of an improved on-line voltage stability index using synchronized phasor measurement." Diss., Mississippi State : Mississippi State University, 2005. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.

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6

Agatep, Allan. "Voltage Stability Analysis Using Simulated Synchrophasor Measurements." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/957.

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An increase in demand for electric power has forced utility transmission systems to continuously operate under stressed conditions, which are close to instability limits. Operating power systems under such conditions along with inadequate reactive power reserves initiates a sequence of voltage instability points and can ultimately lead to a system voltage collapse. Significant research have been focused on time-synchronized measurements of power systems which can be used to frequently determine the state of a power system and can lead to a more robust protection, control and operation performa

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7

Dike, Damian Obioma. "Index-based reactive power compensation scheme for voltage regulation a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2009. http://proquest.umi.com/pqdweb?index=76&did=1919277961&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1265041751&clientId=28564.

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8

Blackmore, Paul David. "Degradation of polymeric outdoor high voltage insulation : surface discharge phenomena and condition assessment techniques." Thesis, Queensland University of Technology, 1997.

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9

Duarte, Silvio Xavier. "Proposta de indicador de qualidade de tensão a partir do impacto de distorções harmônicas e desequilíbrios sobre motores de indução." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-07122006-161223/.

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Esta tese discute a necessidade de monitorar, além das tensões eficazes, os desequilíbrios de freqüência fundamental e as distorções harmônicas de tensão. Apresenta uma forma alternativa para obter os parâmetros de desequilíbrios de freqüência fundamental e de distorções harmônicas a partir da representação dos valores instantâneos no sistema de eixos (DQ) e norma Euclidiana instantânea (NEI). Como contribuição principal, o trabalho propõe obter um parâmetro de qualidade que combina os parâmetros de desequilíbrio e de distorção harmônica. A representatividade dos parâmetros de qualidade é anal

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10

Švindrych, Jan. "Vyhodnocování napěťových událostí s ohledem na odolnost spotřebičů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217198.

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This diploma thesis deals with evaluation of voltage events regarding to immunity of electric appliances. This thesis is divided into three logical sections. In the first part are shown the voltage events, their definitions, causes and spreading in the mains. The second part deals with measurements and existing possibilities of evaluation of voltage events. The third part deals with suggestion of new evaluation of voltage events regarding to immunity of electric appliances and verification in practice.

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11

Quarta, Candida Cristina <1981&gt. "A simple voltage/mass index increases the suspicion of amyloidotic cardiomyopathy: an electrocardiographic and echocardiographic study of 767 patients with increased left ventricular wall thickness due to different causes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7125/1/Quarta_Candida_Cristina_tesi.pdf.

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Background-Amyloidotic cardiomyopathy (AC) can mimic true left ventricular hypertrophy (LVH), including hypertrophic cardiomyopathy (HCM) and hypertensive heart disease (HHD). We assessed the diagnostic value of combined electrocardiographic/echocardiographic indexes to identify AC among patients with increased echocardiographic LV wall thickness due to either different etiologies of amyloidosis or HCM or HHD. Method-First, we studied 469 consecutive patients: 262 with biopsy/genetically proven AC (with either AL or transthyretin (TTR)-related amyloidosis); 106 with HCM; 101 with HHD. We c

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Quarta, Candida Cristina <1981&gt. "A simple voltage/mass index increases the suspicion of amyloidotic cardiomyopathy: an electrocardiographic and echocardiographic study of 767 patients with increased left ventricular wall thickness due to different causes." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/7125/.

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Background-Amyloidotic cardiomyopathy (AC) can mimic true left ventricular hypertrophy (LVH), including hypertrophic cardiomyopathy (HCM) and hypertensive heart disease (HHD). We assessed the diagnostic value of combined electrocardiographic/echocardiographic indexes to identify AC among patients with increased echocardiographic LV wall thickness due to either different etiologies of amyloidosis or HCM or HHD. Method-First, we studied 469 consecutive patients: 262 with biopsy/genetically proven AC (with either AL or transthyretin (TTR)-related amyloidosis); 106 with HCM; 101 with HHD. We c

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13

D'AMBROSIO, GABRIELE. "A Novel Score using Left Atrial Volume Index, Gender, and Age to Predict the Presence of Left Atrial Low Voltage Zones in Patients with Atrial Fibrillation: the ZAQ score." Doctoral thesis, Università degli Studi dell'Aquila, 2020. http://hdl.handle.net/11697/144727.

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Background: Pulmonary vein isolation (PVI) is the cornerstone of catheter ablation in patients with atrial fibrillation (AF). However, in presence of advanced left atrial structural changes, additional targeted catheter ablation of left atrial low voltage zones (LVZs) showed favorable results. Therefore, with the advent of single-shot techniques, it would be helpful to predict the presence of LVZs beforehand. Objective: This study hypothesized that computed tomography derived (CT) left atrial volume index (LAVI) in combination with objective parameters is able to predict the presence of LVZs.

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Dester, Mauricio. "Estudo para classificação de contingencias sob o aspecto da estabilidade de tensão." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/262017.

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Orientador: Carlos Alberto de Castro Junior<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-07T06:07:11Z (GMT). No. of bitstreams: 1 Dester_Mauricio_M.pdf: 1510731 bytes, checksum: 2d78f28f0e947ab2f8b733433312aa84 (MD5) Previous issue date: 2006<br>Resumo: O objetivo deste trabalho é propor um método que permita, de forma rápida e segura, estabelecer uma lista de contingências ordenada por severidade considerando a óptica da estabilidade de tensão. Em linhas gerais, o procedimento consiste

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15

Volf, Michal. "Využití stejnosměrných elektrických metod v diagnostice izolačních materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217255.

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In this work describe to the Dielectric relaxation spectroscopy for the evaluation of the actual status of insulation systém. The used methods of quantifying the dielectric response in time domain are polarization-depolarization current and recovery voltage measurement and in frequency domain the loss factor and the complex capacitance measurement. Influence of thermal ageing and temperature dependences of charge and dischage currents are observed.

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16

Jalboub, Mohamed K. "Investigation of the application of UPFC controllers for weak bus systems subjected to fault conditions. An investigation of the behaviour of a UPFC controller: the voltage stability and power transfer capability of the network and the effect of the position of unsymmetrical fault conditions." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5699.

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In order to identify the weakest bus in a power system so that the Unified Power Flow Controller could be connected, an investigation of static and dynamic voltage stability is presented. Two stability indices, static and dynamic, have been proposed in the thesis. Multi-Input Multi-Output (MIMO) analysis has been used for the dynamic stability analysis. Results based on the Western System Coordinate Council (WSCC) 3-machine, 9-bus test system and IEEE 14 bus Reliability Test System (RTS) shows that these indices detect with the degree of accuracy the weakest bus, the weakest line and the volta

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Jalboub, Mohamed. "Investigation of the application of UPFC controllers for weak bus systems subjected to fault conditions : an investigation of the behaviour of a UPFC controller : the voltage stability and power transfer capability of the network and the effect of the position of unsymmetrical fault conditions." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5699.

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In order to identify the weakest bus in a power system so that the Unified Power Flow Controller could be connected, an investigation of static and dynamic voltage stability is presented. Two stability indices, static and dynamic, have been proposed in the thesis. Multi-Input Multi-Output (MIMO) analysis has been used for the dynamic stability analysis. Results based on the Western System Coordinate Council (WSCC) 3-machine, 9-bus test system and IEEE 14 bus Reliability Test System (RTS) shows that these indices detect with the degree of accuracy the weakest bus, the weakest line and the volta

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18

Manna, Tapan K. "Impulse impedance of grounding systems and its effect on tower crossarm voltage : a dissertation presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online version, 2006. http://proquest.umi.com/pqdweb?index=97&did=1208141981&SrchMode=1&sid=1&Fmt=6&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1256323226&clientId=28564.

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19

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

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20

Mariotto, Lenois. "Avaliação da segurança da operação de sistemas elétricos de potência considerando os limites de estabilidade angular e de tensão." Universidade Federal de Santa Maria, 2008. http://repositorio.ufsm.br/handle/1/3653.

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This work presents new analytical and computational methods for operation security assessment of electric power systems by considering Angle and Voltage Stability Limits. In the context of Angle Stability, it was developed a method for estimating transient security margins based on equivalent network reduction techniques and coherent generators. The angle speed deviation was the criterion used to identify generators that swing together. The reduced order was accomplished by replacing two clusters of coherent generators by an One-Machine Infinite Bus equivalent system. With this equivalent, cri

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21

Neyra, Escobar Juan Carlos. "Análisis de los efectos de la forma del desbalance de voltaje de motores de inducción trifásicos." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2004. http://cybertesis.uni.edu.pe/uni/2004/neyra_ej/html/index-frames.html.

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22

Mírez, Tarrillo Jorge Luis. "Simulación de una microgrid de voltaje continuo/alterno alimentado con fuente solar, eólica, baterías y convencional." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2011. http://cybertesis.uni.edu.pe/uni/2011/mirez_tj/html/index-frames.html.

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En las últimas décadas, la industria eléctrica está experimentando un cambio fundamental desde el tradicional patrón de operación centralizada hacia la introducción de una gran cantidad de fuentes generadoras conectadas a niveles de distribución de Media Tensión. En los últimos años la tendencia se mueve hacia mallas (Grids) de Baja Tensión entre 200V a 1000V, a través de la interconexiones de pequeñas fuentes modulares de generación eléctrica (microplantas). Esto forma un nuevo tipo de sistemas de potencia eléctrica, llamados MicroGrid. El cambio climático mundial ha instado a la utilización

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23

Alfaro, Peraltilla Fabricio Adolfo. "Optimización del Sistema de Monitoreo de Voltajes de Celda y Detección de Cortocircuitos de la Refinería de Plomo de la Empresa DOE RUN Perú." Bachelor's thesis, Universidad Ricardo Palma. Programa Cybertesis PERÚ, 2006. http://cybertesis.urp.edu.pe/urp/2006/alfaro_fa/html/index-frames.html.

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24

Huamán, Bustamante Jesús Omar. "Implementación de un controlador difuso de temperatura prototipo usando la inferencia difusa de Takagi Sugeno." Universidad Nacional de Ingeniería. Programa Cybertesis PERÚ, 2007. http://cybertesis.uni.edu.pe/uni/2007/huaman_bj/html/index-frames.html.

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Hong, Young-Huei, and 洪永輝. "A block incremental algorithm for fast calculation of voltage stability index." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/57270448132556303182.

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博士<br>國立清華大學<br>電機工程學系<br>85<br>Due to the academic value and practical applications, the objective of this dissertation is centered around the developing of a voltage stability index and the implementing of a computer program for voltage stability analysis. The main contributions of this dissertation are: (1) To propose a block incremental algorithm to calculate the minimum singular value of the power flow Jacobian matrix as an index ofvoltage stability; (2) To develop a widely convergen

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Bal, Harpreet Kaur. "Optical fibre refractive index, voltage and strain sensors : fabrication and applications." Thesis, 2011. https://vuir.vu.edu.au/18968/.

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The focus of this thesis is the study of intensity and wavelength-based optical fibre sensors (OFSs) for various applications in three major sensing areas: refractive index (RI), voltage and strain. The thesis aims to provide detailed information on the design and performance of particular intensity-based and wavelength-based (fibre Bragg gratings (FBGs)) OFSs in these three major areas. Furthermore, the thesis provides details of multiplexing strategies for some of these sensors.

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Su, Yu-xian, and 蘇育賢. "Improving the power system stability by using the voltage stability index and STATCOM controller." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/01960528492839357403.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>101<br>In this thesis, we present a control theory, passivity-based control. Improving the power system stability by using voltage stability index(VSI) and static synchronous compensator (STATCOM). Controlling STATCOM to compensate reactive power and determining the danger of voltage collapse by investigating voltage stability index. When the power system is in case of emergency, it can compensate reactive power to power system as storage power. When the output of generator is up to limit, it can control the STATCOM to support the whole power system for preventing v

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Chuang, Hsun-Yuan, and 莊訓洹. "Contingency Selection and Predictions in Static Voltage Stability Problems Using the Tangent Vector Index Method." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/97259279749691878826.

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碩士<br>長庚大學<br>電機工程研究所<br>87<br>Given the current operating condition at each bus from real-time database, from the short-term load forecast, or from near-term generation dispatch, we present a method for real-time contingency prediction and selection in current energy management systems. This method can be applied to contingency prediction and selections for the near-term power system in terms of load margins to collapse and of the bus voltage magnitudes. The propose algorithm uses only two tangent vectors of power flow solutions and curve fitting based techniques to perform look-ahead load ma

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chun, che-chang, and 張哲準. "Voltage Control Refractive Index Vertical Directional Coupler For Integrating Spot Size Converter And Electroabsorption Modulator." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/45562765560392704616.

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碩士<br>國立中山大學<br>光電工程研究所<br>96<br>Abstract Optical spot-size converter (SSC) is an essential element in the opto-electronic integrated circuit because of its direct coupling to single-mode optical fiber, low-cost from the misalignment issue in package. By the tapered waveguide structure, SSC offers a capability to transfer an elliptical optical mode of optical waveguide to single-mode fiber matched mode, allowing the independence of device design from the coupling issue. However, the conversion efficiency of SSC is strongly reliant on tapered waveguide structure, material index, and also excita

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Santosh, Kumar A. "Voltage Stability Analysis of Unbalanced Power Systems." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3065.

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The modern day power system is witnessing a tremendous change. There has been a rapid rise in the distributed generation, along with this the deregulation has resulted in a more complex system. The power demand is on a rise, the generation and trans-mission infrastructure hasn't yet adapted to this growing demand. The economic and operational constraints have forced the system to be operated close to its design limits, making the system vulnerable to disturbances and possible grid failure. This makes the study of voltage stability of the system important more than ever. Generally, voltage stab

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Santosh, Kumar A. "Voltage Stability Analysis of Unbalanced Power Systems." Thesis, 2016. http://hdl.handle.net/2005/3065.

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The modern day power system is witnessing a tremendous change. There has been a rapid rise in the distributed generation, along with this the deregulation has resulted in a more complex system. The power demand is on a rise, the generation and trans-mission infrastructure hasn't yet adapted to this growing demand. The economic and operational constraints have forced the system to be operated close to its design limits, making the system vulnerable to disturbances and possible grid failure. This makes the study of voltage stability of the system important more than ever. Generally, voltage stab

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32

Lin, Yaw Zong, and 林耀宗. "Study of Voltage Stability of A Practical Power System by Using An Efficient Index Calculation Method." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/49806522825547483340.

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Luong, Horace. "Towards voltage-gated ion channels synthesized by solid-phase organic synthesis." Thesis, 2008. http://hdl.handle.net/1828/892.

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The goal of this thesis was to develop a method for efficiently synthesizing a large suite of asymmetric oligoester ion channel-forming compounds. A solid-phase organic synthesis (SPOS) approach on Wang resin was used to generate the ion channel candidates. A follow-on goal is to survey the compounds produced to uncover structure-related controls on ion transport activity. Two classes of building blocks were used to generate the oligoesters – head groups and cores. The core building blocks were three omega-hydroxy acid derivatives six, eight and twelve carbons in length and the alcohol

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Shah, Dhaval. "Stator inter-turn fault detection of doubly-fed induction generators using rotor current and search coil voltage signature analysis." Thesis, 2008. http://hdl.handle.net/1828/2589.

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Wind energy conversion is the fastest-growing source of renewable electric power generation in the world and it is expected to remain so for some time. Doubly Fed Induction Generators (DFIGs) hold more than 50% market share of wind power generators due to its unique benefits of low cost, control capability and scalability. Recent trend of DFIGs installed in wind power are within power range of 200KW-2MW and have stator windings rated at 690V, which are highly susceptible to inter-turn faults. This fault type account for more than 40% of the total failure causes of the generator. A reliable fau

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Гриб, Олег Герасимович, Оксана Николаевна Довгалюк та Галина Викторовна Омельяненко. "Оценка величины экономического ущерба от снижения качества электрической энергии в системах электроснабжения промышленных предприятий". Thesis, 2012. http://repository.kpi.kharkov.ua/handle/KhPI-Press/32541.

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В данном докладе рассматривается влияние качества электрической энергии на работу электроприемников различных промышленных предприятий. Произведен расчет величины экономического ущерба при снижении качества электрической энергии. Выполнен анализ степени влияния составляющих экономического ущерба на работу электроприемников промышленных предприятий.<br>In this report we describe the impact of electrical energy quality on electrical receivers work of various industrial plants. The calculation of the economic impact value caused by the decline in the electric energy quality. The analysis of influ

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B, G. MANJULA. "POWER SYSTEM CONTINGENCY RANKING ADOPTING CONVENTIONAL & FUZZY BASED APPROACH." Thesis, 2011. http://dspace.dtu.ac.in:8080/jspui/handle/repository/13868.

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M.TECH<br>The reliability of power system is generally judged in terms of systems adequacy & security. The term adequacy refers to systems capacity to meet the load demand within the component ratings & voltage limits at any time. The term security refers to system’s ability to withstand the impact of sudden changes due to equipment outage, such as the loss of a generator, transmission line etc. The security of the system is defined in terms of list of contingencies (i.e. transmission line & generator outages) which may cause insecure operation. Clearly as the system conditions changes

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Пайдаркіна, Анастасія Петрівна. "Варіабельність серцевого ритму у людей нормостенічного та астенічного типів конституції". Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/4137.

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Пайдаркіна А. П. Варіабельність серцевого ритму у людей нормостенічного та астенічного типів конституції : кваліфікаційна робота магістра спеціальності 091 «Біологія» / наук. керівник М. М. Малько. Запоріжжя : ЗНУ, 2020. 81 с.<br>UA : Дипломна робота складається з 81 сторінок, 7 таблиць, 18 рисунків, 92 літературних джерел. Об'єкт дослідження – показники серцевого ритму у людей нормостенічного та астенічного типів конституції. Актуальність даної роботи обумовлена специфічністю механізмів адаптивних реакцій у людей з різними типами конституції, що дає можливість цілеспрямованого підбору спос

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Сорока, Оксана Олексіївна. "Варіабельність серцевого ритму у людей юнацького віку з різним рівнем фізичного розвитку". Магістерська робота, 2021. https://dspace.znu.edu.ua/jspui/handle/12345/5654.

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Сорока О. О. Варіабельність серцевого ритму у людей юнацького віку з різним рівнем фізичного розвитку : кваліфікаційна робота магістра спеціальності 091 «Біологія» / наук. керівник М. М. Малько. Запоріжжя : ЗНУ, 2021. 79 с.<br>UA : Дипломна робота складається з 79 сторінок, 4 таблиць, 12 рисунків, 100 літературних джерел. Об'єкт дослідження – показники варіабельності серцевого ритму у людей юнацького віку з різним рівнем фізичного розвитку. Актуальність даної роботи обумовлена необхідністю оцінки стану адаптаційних механізмів у людей з різним рівнем фізичного розвитку, що дає можливість під

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