Estudo da proteção de sobrecorrente pelo Relé Sel-351A.

Abstract

This study addresses a topic widely discussed in the protection area today. With modern technology, protection relays that were robust electromechanical and static relays have become digital in which are much simpler and compact. That was the great incentive of choice of topic. The work consists of a study of electromechanical relays and digital focus of the digital SEL-351A relay, showing its various functions and its bene ts in the same choice. At the beginning we have a basic approach on the history of the relays, showing some advantages and disadvantages. Soon after we discussed the fundamental principles of the relays, as well as the classi cation and the qualities required by a relay. After a little theory of the basic principles of the relays, we focus to the overcurrent function of both the electromechanical relays that are used today in power systems and digital relays. Then we will discuss about the digital SEL-351A relay in which makes the feeders, highlighting the multiple functions that have a focus for the functions of instantaneous overcurrent and time-overcurrent. Finally, we make this relay using the simulation tool AcSELarator Quickset and analyze results.