Overhead Electric Lines
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Determination of Electric and Magnetic Field Calculation Uncertainty in the Vicinity of Overhead Transmission Lines
Abstract This paper presents a new approach for uncertainty determination of the electric field intensity and magnetic flux density calculation in the vicinity of overhead transmission lines. The proposed method is based on the law of propagation of uncertainty as defined in the Guide to the expression of Uncertainty in Measurement. A mathematical model is d
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. 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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3. Religamento monopolar adaptativo rapido baseado na assinatura harmonica da tensão de arco secundario / Fast adaptive single-phase autoreclosing based on secondary arc voltage harmonic signature
Este trabalho apresenta um esquema de religamento monopolar adaptativo rápido para otimizar o tempo compreendido entre a abertura e o religamento da fase sob falta. A proteção adaptativa recompõe rapidamente o sistema de transmissão de energia elétrica, minimizando a probabilidade de propagação de perturbações severas no sistema. O método é funda
Publicado em: 2009
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4. 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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5. Evaluation of the Characteristics of Lightning Return Stroke Electromagnetic Fields Generated by Cloud-to-Ground Lightning. / Avaliação do Comportamento dos Campos Eletromagnéticos Gerados por Descargas Atmosféricas Nuvem-Terra
The occurrence of lightning discharges causes a significant amount of unscheduled supply interruptions in overhead lines of electricity systems, contributing to decrease quality indicators of these systems, even in the case of regions with moderated ground flash density. Focusing on the distribution systems, great part of the problems are related to the indu
Publicado em: 2007
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6. AVALIAÇÃO METROLÓGICA DE ACELERÔMETRO ÓPTICO UTILIZANDO REDE DE BRAGG: APLICAÇÃO EM LINHAS DE TRANSMISSÃO DE ENERGIA ELÉTRICA / METROLOGICAL EVALUATION OF AN OPTICAL FIBER BRAGG GRATING ACCELEROMETER: APPLICATION IN OVERHEAD TRANSMISSION LINES
Overhead transmission lines play an important role on electric systems. Due to the high energy carried through those networks, failures on overhead lines can bring severe constraints on consumers supply, occasionally taking the form of blackouts in large geographic regions. Among the reasons of such failures is the breaking of electric cables caused by the f
Publicado em: 2005
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7. Condensed transmission line model to electromagnetic transient phenomena : use of complex properties / Modelo reduzido de linhas de transmissão para transitorios eletromagneticos : aplicação de propriedades complexas
O objetivo deste trabalho é contribuir para o estudo de linhas de transmissão e o desenvolvimento de modelos de linhas voltados a programas do tipo EMTP. O trabalho desenvolvido consiste em aproveitar as propriedades e semelhanças dos modos não homopolares de propagação das linhas de transmissão, sejam elas idealmente transpostas ou que apresentem pla
Publicado em: 2005
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8. Análise regulatória de alternativas para distribuição de energia elétrica na rede primária em áreas urbanas
The main objective of this dissertation is precisely to stimulate the debate of the urban development, particularly in what it relates to its necessary infrastructure for the distribution of the electric energy, through a regulatory analysis of the alternatives of primary network in the most generic aspects. It will be presenting an implantation chronology o
Publicado em: 2003
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9. ANALYSIS OF THE INSULATION OF AERIAL TRANSMISSION LINES SUBJECT TO VOLTAGE SURGES / ESTUDO DE ISOLAMENTO DE LINHAS AÉREAS DE TRANSMISSÃO SUBMETIDAS A SURTOS DE TENSÃO
Many aspects of an electric utility power system design must be evaluated in detail prior to construction and operation. The choice of insulation requirements on eletric utility system equipment is dictated both by the steady state conditions as well as by overvoltages which can occur on the system. Transmission lines, which are the way to carry energy, are
Publicado em: 1975