Análise de desempenho de uma linha de transmissão frente a descargas atmosféricas

• Autor(a) principal: Exterkoetter, Glaicon
• Data de Publicação: 2020
• Outros Autores: Manoel, Jonas Albino
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Universitário da Ânima (RUNA)
• Texto Completo: https://repositorio.animaeducacao.com.br/handle/ANIMA/4222
• topic: Linha de transmissão; Descargas; Simulação; Interrupções

Lightning strikes are characterized as electrical discharges of high intensity between points initially charged electrically and can cover large extensions, these in turn are the main responsible for interruptions in the transmission lines and burning of transformers, depending on the type of protection applied in the network this episode can generate temporary or permanent interruptions. In order to estimate the number of annual interruptions of a transmission line caused by lightning. Two analysis models were used, these being, by actual grouping of the towers and by grouping through the grounding resistors. After developing the models, the simulations were performed using the ATPDraw® software. The results were expressed in current versus ground impedance curves, and through these it was possible to analyze the presence of backflashover, as well as its probability and number of occurrences. The results of the two analysis models were related, proving their proximity in the numbers of interruptions found. As a final result of 4.5835 disconnections / year for the analysis made with the actual positioning of the towers, requiring 275 simulations, and 4.2083 with the grouping through the grounding resistors, obtained through only 15 simulations. Analyzing the results, it is possible to show that the simplified method (grouping through the grounding resistance) can present satisfactory results with less labor.