Short Circuit Currents
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Celdas solares sensibilizadas con colorantes fotosensibles obtenidos de plantas de la región sur de ecuador
Four vegetal species of the southern of Ecuador were used as sensitizers for making dye-sensitized solar cells (DSSCs). The effect of type and amount of material, type and time of maceration were tested in order to determine the best conditions of extraction. The extraction of the natural dye was made with acidified ethanol. The sensitizing agents were adsor
Quím. Nova. Publicado em: 2017-04
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2. Distributed generators performance during short-circuits considering fault ride-through requirements / Desempenho de geradores distribuídos durante curtos-circuitos considerando requisitos de suportabilidade a afundamentos de tensão = : Distributed generators performance during short-circuits considering fault ride-through requirements
The increase of distributed generation penetration in distribution systems not only helps to diversify the electrical matrix but also brings both technical and economic benefits. Yet, it also raises worries related to energy supply reliability. For wind power plants into the medium and high voltage networks there are the grid codes for "Fault Ride-Through" w
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2012
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3. Desempenho de um painel fotovoltaico de baixa tensão, acoplado ao protótipo de um conversor dc/dc topologia Booster
Low voltage solar panels increase the reliability of solar panels due to reduction of in series associations the configurations of photovoltaic cells. The low voltage generation requires DCDC converters devices with high efficiency, enabling raise and regulate the output voltage. This study analyzes the performance of a photovoltaic panel of Solarex, MSX mod
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/06/2010
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4. Calculo dos parametros de linhas de transmissão trifasicas atraves das tensões e correntes em seus terminais / Calculation of parameters of thress-phase transmission lines through voltages and currents in their terminals
The objective of this work is to calculate the longitudinal and transversal transmission line parameters using phase currents and voltages. Developed equations are used, in the modal domain, considering current and voltages found between a line terminal and an open line terminal, and a short-circuit terminal. . Initially, the basic transmission line theory i
Publicado em: 2009
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5. Analytical methods for analysis of induction generators connected to eletric power distribution systems / Metodos analiticos para analise de geradores de indução conectados em redes de distribuição de energia eletrica
This thesis presents the development of analytical methods for analysis of squirrel-cage induction generators connected to distribution systems. It was developed analytical methods for evaluation of the following technical issues: large-disturbance stability analysis of induction generators; small-disturbance stability analysis of induction generators; deter
Publicado em: 2008
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6. Classificação e localização de faltas em linhas de transmissão usando diferentes arquiteturas de redes neurais artificiais. / Classification and location faults in transmission lines, using different artificial neural networks architectures.
This work presents the development of algorithms for determination of the estimate of the distance of occurrence of fault in a high voltage transmission line, in relation to a local terminal, and also the classification of the fault type, using techniques based on artificial neural networks. The tests and the validation of the proposed algorithms are made us
Publicado em: 2008
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7. Regulador de tensÃo com comutaÃÃo eletrÃnica de taps â anÃlise de operaÃÃo e proteÃÃo das chaves estÃticas
The interconnected operation of large electrical systems and the fast spreading of the electrical sector with an increasing presence of sensitive loads to supply voltage disturbances demanded that the current laws to adapt to consumer needs, for example, to ensure the maintenance of constant voltage levels throughout the feeders of the electrical power distr
Publicado em: 2007
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8. Electromechanical stresses in transformers caused by through-fault and inrush currents / Estresse eletromecânico em transformadores causado por curtos-circuitos passantes e correntes de energização
Transformadores de potência são dispositivos fundamentais para a operação de sistemas de potência e têm um peso significativo no custo total de uma instalação. Além dos custos de manutenção e substituição, as falhas nos transformadores devem ser levadas em consideração, no sentido de manter tanto a continuidade do fornecimento de energia como
Publicado em: 2007
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9. Effective limitation of line fault currents by means of the series-connected VSC-based facts devices
In this paper, the nearly instantaneous response of the series-connected VSC-based FACTS controllers when used to limit possible fault currents in a compensated line, will be presented. The effectiveness of both FACTS controllers (SSSC and UPFC) towards this system condition was investigated exploring the series voltage effect upon the line. Moreover, it wil
Sba: Controle & Automação Sociedade Brasileira de Automatica. Publicado em: 2006-12
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10. MODELING OF AERIAL NETS WITH RETURN FOR LAND IN SYSTEMS OF DISTRIBUTION OF ELECTRIC ENERGY STOPS ANALYSES OF LACKS OF HIGH IMPEDANCE / MODELAGEM DE REDES AÉREAS COM RETORNO POR TERRA EM SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA PARA ANÁLISES DE FALTAS DE ALTA IMPEDÂNCIA
Este trabalho focaliza a modelagem das redes de distribuição monofásicas e trifásicas com retorno por terra, para análise das faltas de alta impedância. A motivação principal está no fato de não existirem soluções definitivas para essas faltas. Este tipo de falta ocorre quando um cabo energizado rompe e cai sobre um tipo de superfície, tal como
Publicado em: 2006
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11. Sistema de monitoramento e metodologia de estimativa dos tempos de operação do disjuntor. / Monitoring system and methodology to estimation of circuit breaker operation times.
The present work addresses the development of a circuit breaker monitoring system so as to collect information for predictive maintenance. The characteristics of the variables that are monitored through certain sensors linked to the circuit breaker, its acquisition and the treatment of the information, are analyzed. A prototype was developed and installed at
Publicado em: 2005
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12. Implementação de um algoritmo para a análise de curtos-circuitos de alta impedância baseado no fluxo de carga soma de potências
This work has as main objective to show all the particularities regarding the Three-phase Power Summation Method, used for load flow calculation, in what it says respect to the influence of the magnetic coupling among the phases, as well as to the losses presented in all the existent transformers in the feeder to be analyzed. Besides, its application is deta
Publicado em: 2002