Energization
Mostrando 1-12 de 88 artigos, teses e dissertações.
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1. Utilização de linhas de transmissão semelhantes no ensaio de energização de um tronco com pouco mais de meio comprimento de onda / Utilization of similar transmission lines on energization test of a trunk with a little more than a half-wavelength
O transporte de grandes blocos de energia elétrica através de longas distâncias que variam de 2500 a 3000 km impõe a utilização de soluções mais adequadas baseadas em linhas de transmissão não convencionais. Uma alternativa em corrente alternada (CA) é a linha com pouco mais de meio comprimento de onda, que para o caso brasileiro, cuja frequência
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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2. 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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3. Analytical methods for analysis of induction generators connected to eletric power distribution systems / Metodos analiticos para analise de geradores de indução conectados em redes de distribuição de energia eletrica
This thesis presents the development of analytical methods for analysis of squirrel-cage induction generators connected to distribution systems. It was developed analytical methods for evaluation of the following technical issues: large-disturbance stability analysis of induction generators; small-disturbance stability analysis of induction generators; deter
Publicado em: 2008
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4. 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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5. Analise comparativa de tecnicas de controle de sobretensões transitorias nas manobras de energização e religamento de linhas de transmissão / Comparative analysis of control switching transient techniques in transmission lines energization and reclosing maneuvers
As sobretensões em um sistema de transmissão não podem ser evitadas assim como a sua total supressão é extremamente difícil, entretanto, suas amplitudes podem ser reduzidas. Tradicionalmente, as sobretensões transitórias advindas das manobras de energização e religamento de linhas de transmissão são limitadas utilizando o método convencional com
Publicado em: 2007
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6. Comportamento de transformadores de corrente sob condições de energização de um transformador de potência
The objective of this dissertation consists in the study of the neutral current on the connection of current transformers when in secondary, shows or not an unbalanced level during the process of energization in a power transformer. These currents according to the test realized in the laboratory can cause disconnection and interruption, causing big damages.
Publicado em: 2006
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7. RURAL MUL TIFUNCTIONALITY - THE USE OF FARMING ACTIVITIES AND RURAL SPACES FOR THERAPEUTICAL PRACTICE / MULTIFUNCIONALIDADE DO RURAL O USO DE ATIVIDADES AGROPECUÁRIAS E DE ESPAÇOS RURAIS PARA PRÁTICAS TERAPÊUTICAS
The present research approaches the perspective of the multiple functions of the rural space and the agricultural, investigating the amplitude of the notion of multifuncionality with empirical focus in the study of the therapeutical practices which use the rural spaces and farming activities in the central region of the Rio Grande do Sul - Brazil. The resear
Publicado em: 2006
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8. Coordenação de isolamento para transitórios de manobra considerando a forma de onda da sobretensões
This work develops a new insulation coordination procedure for transmission lines, considering the influence of the individual characteristics of switching overvoltage waves on the insulation strength. The purpose is to assess how the waveshapes of the transient overvoltages affect the risk of flashover and the air gaps needed, instead of adopting a fixed st
Publicado em: 2006
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9. Modelos computacionais de motores de indução em estudos transitorios de sistemas eletricos
This work presents a comprehensive analysis of the induction motor load behavior, when submitted to dynamical disturbances. The induction motor loads are represented by computational models of different orders, comprising single and double cage. Four major points of the problem are addressed: first, the performance of the different computational models in re
Publicado em: 1996
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10. RESONANT OVERVOLTAGES DUE TO TRANSFORMER ENERGIZATION IN THREE PHASE SYSTEMS / ANÁLISE DE SOBRETENSÕES RESSONANTES DEVIDO A ENERGIZAÇÃO DE TRANSFORMADORES EM SISTEMAS TRIFÁSICOS
Transient overvoltages involving transformer energization, in three phase HV systems, deserve special attention in insulation coordination studies due to the very high values that voltages can reach in a period of a few seconds. Some resonant effects can possibly occur due to harmonics in the magnetizing inrush current. The objective of the present study is
Publicado em: 1982
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11. DYNAMIC OVERVOLTAGES EVALUATION DURING TRANSMISSION LINE ENERGIZATION / DETERMINAÇÃO DAS SOBRETENSÕES A FREQÜÊNCIA INDUSTRIAL DURANTE A ENERGIZAÇÃO DE LINHAS DE TRANSMISSÃO
This paper introduces a digital computer program that enables dynamic overvoltages evaluation during transmission line energization. Both synchronous machine and excitation system arefull scale represented. For a given machine-excitation configuration it is possible to simulate line energization for various machine loadings and different initial terminal vol
Publicado em: 1975
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12. Energization of plant cell membranes by H+-pumping ATPases. Regulation and biosynthesis