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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2007.tde-09012008-143345
Document
Author
Full name
Hamilton Guilherme Bueno de Souza
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2007
Supervisor
Committee
Oliveira, Carlos César Barioni de (President)
Kagan, Nelson
Reis Filho, Francisco Antonio
Title in Portuguese
Análise das correntes transitórias de inrush em redes de distribuição.
Keywords in Portuguese
Eletrodinâmica
Redes de distribuição de energia elétrica
Abstract in Portuguese
O presente trabalho tem como objetivo analisar as correntes de inrush que surgem nos momentos de energização dos alimentadores de sistemas de distribuição. Desta forma, são relevantes em projetos cotidianos de concessionárias de energia elétrica como por exemplo, nos cálculos de ajustes dos dispositivos de proteção. Foram estudadas 291 (duzentas e noventa e uma) amostras extraídas de oscilografias de medidores alocados nas saídas de alimentadores de distribuição, os quais armazenaram informações de tais correntes nos momentos em que houveram religamentos bem sucedidos (carga quente), bem como em energizações após longos períodos de interrupção (carga fria). Todos os alimentadores analisados pertencem a AES-ELETROPAULO. Os valores (em magnitude) das correntes de inrush foram analisados nos primeiros instantes (16,66 ms e 100 ms) logo após o momento da energização dos alimentadores, sendo os valores estudados como variáveis probabilísticas. As análises desta dissertação fundamentaram-se na comparação dos dados oriundos de medição com os resultados de cálculo segundo o modelo tradicional (aplicação de fatores multiplicativos), na qual se observa uma clara majoração que tende a sobredimensionar os resultados das correntes. Desta forma este trabalho sugere a adoção de valores (ou faixa de valores) mais adequados e que tendem a garantir uma aproximação mais consistente com as medições. Comparando os valores (magnitude) dos fatores multiplicativos para as correntes de inrush entre carga quente e carga fria, verifica-se que as correntes de inrush em carga fria tendem a ser maiores do que em carga quente. Bem como em ambas as cargas, observa-se a relação direta de proporcionalidade do fator multiplicativo com a potência instalada dos alimentadores em termos dos transformadores de distribuição.
Title in English
Inrush current transients analysis in distribution feeders.
Keywords in English
Distribution feeders
Inrush current
Protection
Abstract in English
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) oscilography samples extracted from measuring devices oscilographs were analyzed. These devices were placed in the beggining of distribution feeders, and stored information on such currents both in successful reclosing (hot load) events and re-energization after long periods of outage (cold load) events. All feeders analyzed belong to the AES-Eletropaulo. The inrush current values (in magnitude) were analyzed right after (more specifically 16.66 ms and 100 ms) the feeder energization. For this reason, its corresponding values were studied as a probabilistic variables. This analysis was based on the comparison between measured data and traditional model (application of factor coefficients) calculation results, in this way, observed it that the traditional model yields over-dimensioned results which lead to oversizement of the results currents. It has thus suggested revised, more suitable values (or bands of values) which are bound to ensure a more consistent approximation to the real measurements. Upon comparing the final value (in magnitude) results on the analysis of the factor coefficients for inrush currents for hot load and cold load, it is observed that the cold load inrush currents tend to be higher than those for hot load. Furthermore, it was observed the direct relation of proportionality of the factor coefficients to the ratings capacity transformer power installed along the feeder lines.
 
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Publishing Date
2008-02-29
 
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