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Master's Dissertation
DOI
10.11606/D.3.2017.tde-10102017-100131
Document
Author
Full name
Welson Bassi
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1999
Supervisor
Committee
Janiszewski, Jorge Mieczyslaw (President)
Penteado Junior, Aderbal de Arruda
Piantini, Alexandre
Title in Portuguese
Estudo de surtos em redes secundárias de distribuição devido a descargas atmosféricas diretas na rede primária.
Keywords in Portuguese
Baixa tensão
Descargas atmosféricas
Distribuição de energia elétrica
Instalações elétricas
Proteção contra surtos
Raios
Sistema de distribuição
Transitórios
Abstract in Portuguese
Este trabalho apresenta uma análise dos surtos em redes aéreas secundárias de distribuição causados por descargas atmosféricas diretas no circuito primário. Alguns trabalhos publicados sobre o fenômeno são comentados, sendo também analisados vários outros estudos relativos à modelagem de componentes. No trabalho, os principais componentes da rede foram modelados e incluídos na representação de uma topologia típica (com as linhas primária e secundária). Assim, foram considerados: transformador de distribuição, isoladores, pára-raios, cargas (consumidores) e resistências de aterramento. Os modelos foram validados, quando possível, através de ensaios em laboratório. Algumas alternativas de proteção da rede secundária foram consideradas. Foi verificada a influência de alguns parâmetros relevantes tais como amplitude e tempo de frente da corrente da descarga, resistências de aterramento, modelos de cargas e posição da descarga. Os resultados foram obtidos por simulações computacionais realizadas através do programa ATP (Alternative Transients Program). São apresentadas formas de onda de sobretensões nos consumidores. Também são apresentados e discutidos valores de corrente e energia nos dispositivos de proteção, fornecendo informações sobre as alternativas de proteção.
Title in English
Surge study on secondary distribution networks due to direct lightning discharges in the primary networks.
Keywords in English
Lightning
Low-voltage
Model
Modelling
Power distribution
Power distribution lines
Power system transients
Surge protection
Abstract in English
This work presents an evaluation of surges in low-voltage overhead distribution lines caused by direct lightning strikes in medium voltage lines. Some publications concerning the phenomenon are commented and several other studies used during the process of modeling of the components are also analysed. The main components of the distribution system were modeled and included. So, a typical distribution network topology (with the primary and secondary lines) was represented including its components: distribution transformer, insulators, surge arresters, loads and ground resistances. The performance of the developed models, whenever possible, was verified by laboratory tests. Some possibilities of the secondary protection were included. Parameters having major effect on the results, such as the lightning current amplitude and front time, the values of grounding resistances, the models of the loads and the lightning strike position were taken into consideration in the study. The results were obtained by simulations performed using the ATP (Alternative Transients Program). Waveforms are presented in order to provide information on the characteristics of the overvoltages in the consumers along the line. Currents, as well as energy absorbed by the low-voltage surge arresters are aldo presented and discussed, providing useful information about the performance of some protection alternatives.
 
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WelsonBassi_D.pdf (5.58 Mbytes)
Publishing Date
2017-10-10
 
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