Estudo de caso para validação dos Modelos de Cálculo de Energia Incidente em Sistemas de Corrente Contínua: usina fotovoltaica do Instituto Leão Sampaio em Juazeiro do Norte - CE

Abstract

With the increase in the use of Distributed Generation the need for protection against faults that can generate electric arc in direct current systems has increased as well, demanding a comparison between calculation models of incident energy aiming to list them for each circumstance, to better dimension direct current protection equipment and personal protective equipment to mitigate damages to the electrical panel, which holds the equipment, and the individuals who will operate the panel or that are in the vicinity of the board. This study aims to present Ralph Lee, Stokes & Oppenlander and Paukert’s models for calculating incident energy in direct current and compare them, in order to show in which situations their applicability fits better and in others that should not be adopted. The models presented are compared using current and arco power graphs by short circuit current, in order to compare the curves between the models. After all, which one is the most reliable? The most conservative? And with that opening discussions about the methodologies covered by NFPA 70E and IEEE 1584. This work also presents a case study that applies the incident energy calculation models and from the results obtained, again compares the methodologies in order to validate the comparisons previously made.