Engenharia Elétrica
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Estudo de Caso Acesso embargado Avaliação de sistema de proteção contra descargas atmosféricas com uso de terrômetro de hastes e miliôhmímetro(2020) Marchi, Matheus MendesLightning or lightning is a destructible phenomenon, it happens in a short period, but it can cause damage and death. The protection of lightning strikes is essential to reduce the risks of this phenomenon. The Brazilian standard NBR 5419: 2015, divided into 4 parts, defines procedures to determine standards to be adopted in carrying out projects and reports, which aim to protect not only the building and people, but also electronic equipment. The building to be studied was made on top of the old standard, NBR 5419: 1993, and presented visual problems in the lightning rod system. In order to evaluate this system, measurements were made in the field with calibrated equipment and with procedures of NBR 15749, in addition to the visual analysis of the building. The measurements were laborious, as the installation did not have inspection boxes for these types of tests. As a result of the measurements, problems were found in practically the entire system, several non-conformities with the original design, thefts in the entire copper mesh of the roof, considering a poor maintenance system. Procedures were suggested to reassess the entire SPDA, through risk analysis and therefore define a level of protection considered for tolerable risks and thus readjust almost the entire protection system.