Lightning Discharge
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Lightning Protection Design for Small Riverboats Using the FDTD Method
Abstract The Amazon region has high lightning occurrence rates, with many lightning hot spots. Different rivers cross the Amazon rainforests and the people that live there use these rivers as roads to go from one place to another. Every year, lightning deaths are reported in the Brazilian Amazon region. In 2018, a lightning discharge struck a small riverboat
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Um estudo sobre tensões induzidas por descargas atmosféricas em linhas de transmissão
The study of lightning and the resulting induced voltages is very important in the process of designing of transmission lines. In this work it will be presented problems that can be caused by such phenomenon in electrical systems, as a consequence of these voltages peaks. A analysis of the characterization of atmospheric discharge is performed in order to un
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/09/2011
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3. Medidas de corrente contínua em raios nuvem-solo negativos naturais no Brasil: Desenvolvimento de instrumentação e primeiros resultados / Measuring of continuing currents in natural negative cloud-to-ground lightning on Brasil: development of equipment and first results
This work presents the first quantitative study of the continuing current (Icc) in negative cloud-to-ground flashes (-CG) in Brazil. The Icc is a low intensity current that follows some return strokes in -CG flashes. Their long durations result in large charge transfers that are responsible for most lightning damage associated with thermal effects. In this s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/04/2009
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4. Medidas de corrente contínua em raios nuvem-solo negativos naturais no Brasil: Desenvolvimento de instrumentação e primeiros resultados / Measuring of continuing currents in natural negative cloud-to-ground lightning on Brasil: development of equipment and first results
This work presents the first quantitative study of the continuing current (Icc) in negative cloud-to-ground flashes (-CG) in Brazil. The Icc is a low intensity current that follows some return strokes in -CG flashes. Their long durations result in large charge transfers that are responsible for most lightning damage associated with thermal effects. In this s
Publicado em: 2009
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5. Medidas de corrente contínua em raios nuvem-solo negativos naturais no Brasil: Desenvolvimento de instrumentação e primeiros resultados / Measuring of continuing currents in natural negative cloud-to-ground lightning on Brasil: development of equipment and first results
Este trabalho apresenta o primeiro estudo quantitativo da corrente contínua (Icc) em descarga de retorno de raios nuvem-solo negativos (NS-) naturais no Brasil. A Icc presente em alguns raios é uma corrente de baixa intensidade, mas que pela sua longa duração transfere uma grande quantidade de carga elétrica. É, portanto responsável pelos danos associ
Publicado em: 2009
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6. 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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7. "Avaliação de correntes de descargas atmosféricas através de medições diretas em estruturas altas" / Lightning current discharge evaluation through direct measure in tall towers
The characteristics of lightning currents have a fundamental importance on insulation coordination and on the design of transmission and distribution lines equipment. The CIGRE cumulative frequency distribution curves relative to the main parameters of the first and subsequent downward flashes, which are very frequently used for the evaluation of the lightni
Publicado em: 2005
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8. Surtos atmosféricos transferidos à rede secundária via transformador. / Lightning surges transferred by transformer to low voltage network.
As descargas atmosféricas estão entre as principais causas de distúrbios nos sistemas elétricos, provocando sobretensões e ocasionando uma parcela significativa das interrupções não programadas. Tais distúrbios são cada vez mais percebidos pelos consumidores, ocasionando desde o mau funcionamento até a queima de aparelhos e equipamentos eletro-ele
Publicado em: 2004
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9. Estudo da forma de onda de campo elétrico de relâmpagos / Study of the electric field waveform of lightning.
Neste trabalho são analisadas formas de onda de campo elétrico da radiação eletromagnética gerada por relâmpagos ocorridos na cidade de São José dos Campos e vizinhança. Para a aquisição das formas de onda de campo elétrico foi utilizado um aparato composto por uma antena ligada a uma eletrnica, a qual processa o sinal proveniente da antena e o
Publicado em: 2000
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10. Analysis and modelling of negative downward lightning current curves between 1985 and 1994 at Morro do Cachimbo research station (MG) / Analise e modelagem de curvas de corrente de relampagos negativos descendentes entre 1985 e 1994, na estacao de pesquisa do Morro do Cachimbo - MG
In this thesis is presented an analysis of 22 negative descendent lightning collected in Brazil from 1985 to 1994 in the Morro do Cachimbo research station (43o 58 26 W, 20o 0039 S) of the Companhia Energética de Minas Gerais (CEMIG). The historic evolution of direct discharge measurements and the thecniques involved are summarised. From the comparation of
Publicado em: 1998
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11. The cloud–ionosphere discharge: A newly observed thunderstorm phenomenon
This paper deals with a luminous electric discharge that forms in the mesospheric region between thundercloud tops and the ionosphere at 90-km altitude. These cloud–ionosphere discharges (CIs), following visual reports dating back to the 19th century, were finally imaged by a low-light TV camera as part of the “SKYFLASH” program at the University of Mi
The National Academy of Sciences of the USA.