Power Distribution Lines
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Avaliação do comportamento dielétrico de isoladores de distribuição de média tensão frente a impulsos atmosféricos com formas de onda não normalizadas / Analysis of the dielectric behavior of medium voltage insulators under non-standard lightning impulse voltages
As linhas de distribuição de energia estão freqüentemente expostas a sobretensões causadas por descargas atmosféricas diretas e indiretas. As formas de onda dessas sobretensões têm uma faixa de variação muito ampla e podem diferir bastante do impulso atmosférico normalizado utilizado em ensaios para verificação da adequação dos projetos das is
Publicado em: 2011
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2. Obtenção de uma porcelana dielétrica a partir de matérias-primas do Rio Grande do Norte
The dielectric porcelain is usually obtained by mixing various raw materials proportions and is used in the production of electronic equipment for various applications, from capacitors of high and low Power to insulators for low, medium, high and extra high voltage, which are used in distribution lines and transmission of electricity.This work was directed t
Publicado em: 2010
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3. Desempenho de Linhas de Distribuição frente a Descargas Atmosféricas:: estudo e Implementação do Guia IEEE Std 1410
Lightning is one of the most important sources of disturbances in distribution systems that can cause permanent or momentary interruptions. The growing concern regarding power quality has created great interest in the interaction of lightning with power systems and an improved protection against its effects on distribution lines. Studies indicate that, in Br
Publicado em: 2009
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4. Prevalência de exposição aos campos eletromagnéticos e justiça ambiental no município de São Paulo / Prevalence of exposure to electromagnetic fields and environmental justice in the city of São Paulo
The paper discussed the raising problem of risk in our current technological paradigm, their perception and tolerability, as well as their unequal distribution among the society. The fundamental assumption that emphasizes Environmental Justice refers to the hazards and risks disproportionately or unfairly distributed among the most vulnerable social groups,
Publicado em: 2009
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5. Avaliação ex ante de projetos tecnológicos e de inovação: uma análise do processo de julgamento e seleção do programa de recursos humanos em atividades estratégicas - RHAE - 2002 a 2007
The present work focus on the analysis of the ex ante evaluation process (assessment and selection) of technological and innovation projects presented for support to the Human Resources in Strategic Activities Program (RHAE), conducted by the Brazilian National Scientific and Technological Development Council (CNPq). It presents a literature review of the ex
Publicado em: 2009
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6. Incentivos em canais de distribuição: um estudo comparativo entre o Brasil e os EUA no setor de defensivos agrícolas / Incentives in channels of distribution: a comparative study between Brazil and the USA in the sector of defense
Incentive programs are a set of benefits offered by manufacturers to dealers as dealers achieve the objectives established by manufacturers. Incentives in marketing channels are used by manufacturers to allocate resources and to align channel members objectives. Although marketing channel incentive programs have been widely used by different industries, they
Publicado em: 2008
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7. USO DE GERADORES EÓLICOS DE PEQUENO PORTE PARA IRRIGAÇÃO NO SEMI-ÁRIDO DO ESTADO DE SERGIPE. / USE OF WIND GENERATORS SMALL FOR IRRIGATION IN SEMI-ARID STATE SERGIPE.
The renewable sources of energies are shown as an interesting alternative to minimize the problem of the electric power lack faced by the rural man, mainly in the remote places where the difficulties of distribution of the electrification lines, above all in the economical aspect, they are big being shown unviable. The energy eolic besides other purposes, ca
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2007
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8. Inrush current transients analysis in distribution feeders. / Análise das correntes transitórias de inrush em redes de distribuição.
The purpose of this dissertation is to analyze the inrush currents generated upon the energization of distribution system feeders. These said currents are relevant for typical designs in electric power concessionaries, for example upon calculating the ideal settings for protection devices. It was analyzed (or studies) 291 (two hundred and ninety one) oscilog
Publicado em: 2007
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9. Cruzetas de polímeros reciclados: caracterização dos materiais, análise numérica e ensaios de modelos reduzidos / Recycled polymer crossarms: characterization of the materials, numerical analysis and tests in reduced models
Nowadays, wood is still the most used material in crossarms of aerial power distribution lines in Brazil. However, it has caused problems to power utilities concerning (i) degradation due to defects and attacks of fungi and insects, (II) higher operational costs to replace damaged pieces and (III) environmental problems, as the raw material has become scarce
Publicado em: 2007
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10. Voltage unbalace numerical evaluation and minimization:estimation by incremental sensitivity analysis and analytical solutions / Avaliação e minimização numérica do desequilíbrio de tensão : estimativa por análise de sensibilidade incremental e soluções analíticas
Voltage unbalance is one of the parameters analysed in power quality studies, representing the difference between the magnitudes of the voltages of a tri-phase electrical system, and the phase shift between these. It is desirable to have sinusoidal voltages with identical magnitudes and 120 electrical degrees phase shift between them, but in practice, there
Publicado em: 2007
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11. Wood cross-arms coated with polyurethane resin - tests and numerical simulations
Brazil's electric power utilities have commonly employed native timbers as the main material for manufacturing cross-arms for distribution lines. However, the increasingly high costs of these timbers and Brazil's new environmental laws have contributed to change this situation, spurring research on new materials for application in transmission and distributi
Materials Research. Publicado em: 2006-03
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12. Optimum sizing of units of generation distributed in radial systems of distribution through techniques of nonlinear programming. / Ajuste ótimo da potência inserida por unidades de geração distribuída em alimentadores de média tensão
The optimum sizing of units of Distributed Generation is a problem to which this formulation takes in consideration the reduction of losses in the distribution lines, the voltage control, the capacity (in MW) of the units respecting the operational limits of the system. The main objective of the sizing process is to determine the active and reactive power le
Publicado em: 2006