Brazilian Electrical System
Mostrando 13-24 de 57 artigos, teses e dissertações.
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13. Análise do comportamento de uma linha de um pouco mais de meio comprimento de onda sob diferentes condições de operação em regime permanente e durante a manobra de energização / Analysis of the behavior of an isolated transmission line with a little more than half wave lenght for different operating conditions in steady state and during the energization manouver
This work presents an analysis of the behavior of an isolated transmission line with a little more than half-wave length (2600 km) on fundamental frequency, 60 Hz, connected to an infinite busbar for different operating conditions. The voltage and current profiles for different loading conditions are monitored along the line. An analysis of the influence of
Publicado em: 2010
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14. Contribuições ao processo computacional para análise de pedidos de indenização por danos em equipamentos elétricos
The increasing number of refunding requests related to electrical and electronic equipment damages has attracted the attention of the electric utilities, consumers, regulatory and other government agencies. Such concerns are not associated only with the financial contents involved, but especially with the social impacts associated to requests, decisions, con
Publicado em: 2010
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15. DECISION SUPPORT SYSTEM FOR THE DIAGNOSIS OF FAULTS IN POWER TRANSFORMERS / SISTEMA DE APOIO À DECISÃO PARA O DIAGNÓSTICO DE FALTAS EM TRANSFORMADORES DE POTÊNCIA
Given the complexity of the Brazilian energy matrix and in particular of the whole interconnected electrical power system, it is essential to ensure that the equipment, from generation to final consumers, operates in a satisfactory way and high levels of reliability. In accordance with the restructuring of the sector and its integration in a competitive mark
Publicado em: 2009
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16. Segurança para o sistema brasileiro de televisão digital: contribuições à proteção de direitos autorais e à autenticação de aplicativos. / Security on brazilian digital television system: contributions to the digital rights protection and to applications authentication.
In Brazil, the television system is considered an important source of communication and entertainment. The Brazilian digital transmissions started on December 2007 and first offered functionalities were the high definition, mobility and portability. In a later moment other functionalities will be added: multiprogramming (more than one service per channel) an
Publicado em: 2009
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17. Contribution to the surge arresters´ evaluation methodology of electrical transmission system. / Contribuição à metodologia de avaliação dos pára-raios do sistema de transmissão de energia elétrica
Power systems are subject to many types of overvoltages that may provoke interruptions or damage in electrical equipments, compromising the continuity of electrical energy supply to consumers and impacting negatively the power quality indices. One of the most important device used to protect the electric equipments are the surge arresters, which may be class
Publicado em: 2009
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18. The impact of power supplied by the ethanol reformer and fuel cell : a scenary for promotion of the social and environmental development of the community of "Pico do Amor"/ MT / O impacto da energia eletrica proveniente do reformador de etanol e celula a combustivel : cenario para a promoção do desenvolvimento socioambiental da comunidade "Pico do Amor"/MT
The energetical planning of isolated communities has been trying to attend only the residential electrical energy demand. However, taking into account the family financial low level, this population characteristic, it is believed that the electrical energy should be directed for other specific goals: the execution of productive activities to promote the soci
Publicado em: 2009
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19. AVALIAÇÃO E REFORÇO DAS CONDIÇÕES DE ESTABILIDADE DE TENSÃO EM BARRAS DE TENSÃO CONTROLADA POR GERADORES E COMPENSADORES SÍNCRONOS / VOLTAGE STABILITY ASSESSMENT AND ENHANCEMENT IN VOLTAGE-CONTROLLED BUSES BY SYNCHRONOUS GENERATORS AND COMPENSATORS
After the incidence of some voltage collapses in the energy transmission systems in the world, the voltage security became an issue of great interest in the last years due to the importance of its impact. The phenomenon of voltage stability is due to the excessive active and reactive power flow in the electrical transmission network and has been associated w
Publicado em: 2009
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20. Mains conditionals of alterations in model wholesale energy market: retrospective and critical analysis. / Principais condicionantes das alterações no modelo de comercialização de energia elétrica: retrospectiva e análise crítica.
This work has the objective of presenting the main changes in the Brazilian electrical sector institutional model, stating the whole environment and the reasons that motivated the deep changes occurred since 1995, strongly influencing the operation of the Brazilian Electrical System. It is expected that after this work it would be possible to get a better co
Publicado em: 2008
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21. Ferramenta para Avaliação da Energia Firme Baseada em Técnica de Pontos Interiores / A tool for Evaluation of Firm Energy Based on Interior Point Technique
The energy sector planning is fundamental to assure the energy supply at the smallest costs and risks and with the smallest socioeconomic and environmental impacts for the society. These factors as well as the aspects complexity involved in the industry operation of the electrical energy production explain the importance of the energy sector planning. Nowada
Publicado em: 2008
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22. OperaÃÃes de SWAP no mercado de energia
In brazilian electrical sector, the linked system is divided by four subsystems, due to the electrical restrictions in their linkages. This condition brings, as result, an existing possibility of distinct Differences Clean-up Price in each of those subsystems. Concerning to actual brazilian legislation, the electrical sector agents are free to negotiate the
Publicado em: 2008
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23. Analise de viabilidade de troca de motores eletricos superdimensionados e a influencia da energia reativa / Analysis of feasibility of the change of super dimensioned electrical engines and the influence of reactive energy
This study shows the importance of the electrical engine of triphasic induction rotor (squirrel cage), which is the main responsible for the waste of electrical energy in industry; it presents its electrical and mechanical characteristics and its evolution along the years, as well. The study describes the problem of the super dimensioning of these engines th
Publicado em: 2008
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24. Electricity generation from the offshore wind energy source. / Geração de energia elétrica a partir da fonte eólica offshore.
In the last decade wind power source was the fastest-growing energy source. Technological learning curves for this sector fall down by a 15% a 20% rate each 3 years. Countries which are committed with wind power are running after the target of 12% wind into the worlds electrical production by 2020. The contribution of the offshore wind power (OWP) source is
Publicado em: 2008