Power System Protection
Mostrando 13-24 de 91 artigos, teses e dissertações.
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13. Sistema híbrido inteligente para o monitoramento e proteção de transformadores de potência / Hybrid intelligent system for monitoring and protection of power transformers
Este trabalho apresenta um conjunto de métodos para a proteção e o monitoramento de transformadores de potência baseado em sistemas inteligentes e na aplicação das transformadas de Clarke e Wavelet. A abordagem inteligente utilizada permite analisar a condição operativa dos transformadores de potência e detectar a ocorrência de defeito interno, dis
Publicado em: 2010
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14. IDENTIFICATION OF THE BEHAVIOR OF TEMPERATURE MAIN RECTIFIER OF A DIESEL-ELECTRIC LOCOMOTIVE / IDENTIFICAÇÃO DO COMPORTAMENTO DA TEMPERATURA DO RETIFICADOR PRINCIPAL DE UMA LOCOMOTIVA DIESEL-ELÉTRICA
In this dissertation, we explore the application of the Theory of System Identification to develop a mathematical model that represents the behavior of the electrical current rectifier used to power the traction motors of a locomotive diesel-electric, based on mathematical manipulation of its temperature data. It was developed an ARX model and, using the aid
Publicado em: 2010
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15. Análise do impacto da proteção antiilhamento na estabilidade de geradores conectados via inversores / Stability analysis of inverter-based distributed generators with antiislanding protection
O uso de geradores conectados via inversores em redes de distribuição de energia elétrica tem aumentado consideravelmente nos últimos anos em razão dos avanços obtidos nas tecnologias de células a combustível e fotovoltaicas bem como de microturbinas e turbinas eólicas. Nesse contexto, a utilização de sistemas de proteção antiilhamento no ponto
Publicado em: 2010
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16. Estudo de viabilidade de um sistema de monitoramento de baixo custo para os sistemas de distribuição reticulados subterrâneos / Viability Study of a Low Cost Monitoring System for Underground Power Distribution
This work presents a viability study for a Low-cost Monitoring System (SMBC), through the examination of the operational improvements on electrical network distribution systems when new functions are added to network protectors relays allowing remote monitoring and control using typical automation protocols. The improvements on energy supply quality by reduc
Publicado em: 2010
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17. A legitimidade da jurisdição de primeiro grau na concretização dos direitos fundamentais: proposta de um novo modelo jurídico-administrativo para o segundo grau de jurisdição
The current study is about the legitimacy of lower court jurisdiction as a way of exercising basic legal rights, proposing, therefore, a new legal-administrative model for appellate court. In order to achieve that, a demonstration of the importance of basic legal rights in the Brazilian legal system and an open interpretation in light of the Constitution, as
Publicado em: 2010
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18. A obtenção e o emprego de informações pela administração tributária em face das normas de sigilo
The scope of this study is to look into tax-related information from the moment it is seized to the moment it is used as evidence of fines and taxes levied. This study is justified due to the vulnerableness of the individuals fundamental right to privacy. The right to privacy, especially in terms of protection of financial and tax-related data, is protected
Publicado em: 2010
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19. Estudo teórico sobre meios de determinação de Áreas de Preservação Permanente (APPs) marginais aos cursos d água através da análise de fatores ambientais no âmbito da bacia hidrográfica: enfoque geomorfológico / Theorical study about the determination of the Permanent Preservation Areas (PPAs) marginal to the water courses through the analysis of the environmental factors in the context of the watershed: geomorphology focus
The Permanent Preservation Areas (PPAs) were imposed by New Brazilian Forest Code in order to ensure the stability of the landscape, water and biotic features. Among the types of PPAs are those which protect the marginal portions of the watercourses, which are currently focuses of environmental conflicts, given its regulatory power that overly restricts the
Publicado em: 2010
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20. Uma contribuição à alocação de geração distribuída, a inserção de PCHs com máquinas síncronas nos sistemas rurais de média tensão
The present work is about an analysis in the domain of distributed generation (DG) allocation in rural distribution systems; the study takes into account the synchronous machines. In such a way, it was possible to research several impacts caused by DG in distribution systems, such as: the rotor angle stability problem under small disturbances; increase of vo
Publicado em: 2009
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21. Using a multi-agent system in communication networks for an adaptive digital distance protection system / Utilização de um sistema multi-agentes em redes de comunicação para a proteção digital de distância adaptativa
This research presents the development of an adaptive digital distance protection system by a multi-agent system (MAS). This MAS will work in a distributed way, with expert entities (agents) inserted in specific places and acting efficiently in the solution of local problems. With the application of the MAS, the distance relays will have desirable characteri
Publicado em: 2009
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22. Descentralização e difusão da defesa da concorrência no Brasil : uma análise a partir de pressupostos democrático-federativos
This dissertation aims to analyze the currently institutional arrangement for the defense of competition in Brazil, from its historic role, and proposes a new model, not only more in agreement to our federal system, but that also promotes the dissemination of this public policy. This reflection is important at the moment as we are debating a new institutiona
Publicado em: 2009
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23. IEC-61850: interoperability and interchangeability between supervision, control and protection equipment using data communication networks / IEC-61850: interoperabilidade e intercambialidade entre equipamentos de supervisão, controle e proteção através das redes de comunicação de dados
Data communication has always been considered as a critical factor in real time operation of electric power systems. This is due to the need for fast and accurate decisions at different locations, from power generation to the user interfaces. With the digital technology, measurement, signals and commands are encrypted into data packets that travels on the su
Publicado em: 2009
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24. 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