Metodologia de estudo coordenação e seletividade para clientes com subestação de potência superior a 300 kVA

Abstract

An Electrical power system is always subject to contingencies, short-circuit being one of the most common and with larger impact. This kind of fault implicates on an abrupt increase of current, provoking a considerable voltage drop, which causes big conse-quences to the power system. This way the modeling of a protection system is es-sential. In order to decrease the number of consumers affected by a fault, the protec-tion system must be created in a way that only the protective devices directly con-nected to the faulted circuit will operate. This way, it is necessary to perform a coor-dination study over all the equipment that composes the protection system. This pa-per presents the main steps necessary to model a protection schematics to private transformers, demonstrating some concepts needed to do it, as well as the presenta-tion and scaling of the equipment that compose a protection system. As proof of the data exposed in this work, a case study was made, showing in detail the steps of the study of coordination and selectivity.