Electrical Power Quality
Mostrando 25-36 de 81 artigos, teses e dissertações.
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25. Dynamic response of three-phase induction motors to voltage sags in the power supply network / Resposta dinâmica dos motores de indução trifásicos a afundamentos de tensão na rede de alimentação
This research shows a study on the dynamic response of three-phase induction motors submitted to voltage sags. Computer simulations about a distribution system, as well as the modeling of three-phase induction motors based on actual data, were made using ATP (Alternative Transients Program) software. These simulations intended to generate representative situ
Publicado em: 2009
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26. 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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27. Detecção de eventos para monitoração de qualidade de energia elétrica por medidores de faturamento usando a Transformada Wavelet e a Norma Euclidiana Instantânea. / Detection of events for monitoring the quality of billing electronic meters by using Wavelet Transform and the Instantaneous Euclidian Norm.
This work shows the possibility to add new functions for detection and registration of disturbances that affect power quality to electronic billing meters. The widespread installation of these meters in the power network makes this resource a powerful analysis tool. Remote communication channels in these meters create an easy way for reading and registering
Publicado em: 2009
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28. Single-line-to-earth fault limitation through the setting of Petersen coil in power transformer neutral / Limitação de correntes de falta fase-terra por meio do ajuste de bobina de petersen em neutro de transformadores de potência
The Petersen coil insertion on the neutral of the electrical distribution power system transformers has been a technical strategy adopted for several electrical utilities, in many countries with the purpose to reduce the earth-fault current intensities, enabling circuit disconnect decrease for intermittent faults and so to improve the electrical power qualit
Publicado em: 2009
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29. SistemÃtica para identificaÃÃo de nÃo-conformidades e proposiÃÃo de aÃÃes mitigadoras contra incÃndio em transformadores de potÃncia
In an electrical system, fires in power transformers, normally, cause great upheavals and high loss to the electric energy companies, to the society, to the environment and, in a considerable way, to the productive process. The transformers have an important role in an electrical system of power. Located in substations, and being the most expensive and impor
Publicado em: 2009
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30. 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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31. Uma contribuição para a área de saúde por meio da verificação do impacto da qualidade de energia e das instalações elétricas nos equipamentos eletromédicos. / A contribution to the health area by means an assessment of the impact of quality of power and of electrical installations upon electromedical equipment.
Em todos os segmentos da sociedade, a utilização de equipamentos eletrônicos projetados e construídos com avançadas tecnologias eletrônicas e controlados por microprocessadores aumenta a cada dia. Na área de saúde, denominados de equipamentos eletromédicos, dão suporte aos setores de diagnóstico, tratamento ou, procedimento cirúrgico, melhorando
Publicado em: 2009
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32. "Afundamentos de tensão no contexto da expansão dos sistemas elétricos: proposta de índices considerando dados do sistema de detecção de descargas atmosféricas"
The impact of voltage sags to power utilities and consumers has been remarking this event as a relevant phenomenon to address in power system studies. It is considered one of the most frequent sources of power-supply interruption and malfunction on several types of equipment, resulting in power-quality degradation. Nowadays, voltage sag has been basically ad
Publicado em: 2009
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33. MÉTODOS PARA OTIMIZAÇÃO DOS AJUSTES DOS REGULADORES DE TENSÃO E ZONAS DE TAP EM SISTEMAS DE DISTRIBUIÇÃO / METHODS FOR OPTIMIZATION OF THE VOLTAGE REGULATORS AND TAP ZONES IN DISTRIBUTION SYSTEMS
The new regulations in the electric sector utilities have have requested greater efficiency and quality both in terms of continuity and in conformity of the energy supplied. Electrical equipments quality, efficiency and useful life depend directly of the power quality supplied. In addition to operation of equipments, supply of energy within the limits must b
Publicado em: 2009
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34. Utilization of electrical power industry to finance education with a view to economic development: a purpose for Brazil. / Utilização da industria de energia elétrica para financiar a educação com vistas ao desenvolvimento econômico: uma proposta para o Brasil
Abstract Starting from the observation of the awful living situation of the majority of the Brazilian population 34.1% living below the poverty line and the increasing profitability of the electricity industry in the country, this project aimed at finding a way in which the electricity industry could provide financial assistance to eliminate part of the Braz
Publicado em: 2009
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35. O impacto da descentralização das atividades da ANEEL sobre a qualidade da energia elétrica residencial no Brasil / The impact of decentralization of activities of ANEEL on the quality of residential electricity in Brazil
Um dos objetivos da descentralização, aos estados e ao Distrito Federal, das atividades vinculadas às atribuições da Agência Nacional de Energia Elétrica (ANEEL) é aproximar a ação reguladora dos agentes e consumidores, tornando-a mais ágil, presente e adaptada às circunstâncias locais. A execução dessas atividades abrange a regulação, contr
Publicado em: 2009
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36. APROVEITAMENTO DA CASCA DE ARROZ EM UMA MICRO CENTRAL TERMOELÉTRICA AVALIAÇÃO DOS IMPACTOS ECONÔMICOS E AMBIENTAIS PARA O SETOR ARROZEIRO DO RIO GRANDE DO SUL
The rice husk production in Rio Grande do Sul, state responsible for more than half of this cereals country production, leads to the need of an appropriate environmental management in view the impacts produced by this residue in the environment, whether they be local or global, like greenhouse effect impacts. Therefore, a rational utilization of this energet
Publicado em: 2009