PROTEÇÃO DE SISTEMAS ELÉTRICOS: Estudo de caso e análise da seletividade na Subestação Três Corações

Abstract

The subject of this work is about the protection in power electric systems. With the humanity progress and with advances in technology the dependency on the eletric power is became more evident. When occurs an power interruption the losses are to consumers and for the concessionaires. For this reason, the protection in equipments of power electric systems is becoming more important. Thie protection can be done in different ways and in a different parts of the generation system, transmission and power distribution. The relays are one of the essential equipments to make this protection more effective. The objective of this work is to present the main devices and the protection in power electric systems, placing the emphasis in the distribution system and the protection relays, besides of accomplished an case study regard Três Corações substation which is shared and operated by private company company analyzing the interruptions occurred between September 2015 and Feburary 2016. through the data that will be obtained by relay 351-A oscilography. From this study case it was concluded that the biggest concentration of events occurred in the month with rainy weather, it was also concluded that the SEL 351-A relay is acting in the correct way in relation with it's adjustments, finally, it showed the importance of collecting data at the moment of the event to avoid future failures and to an agile re-establish of supply, through the adequate adjustments.