Estudo e implementação das funções de controle e proteção baseadas na norma IEC 61.850 para a automação da subestação de 69-13,8 kV do campus do Pici da Universidade Federal do Ceará

Abstract

This work aims to present the study of protection, parameterization and testing of logic functions, based on IEC 61.850, for the feeders protection of the power substation of 69- 13,8 kV of Pici Campus. The concepts and topologies of the distribution systems, requirements for a protection system and its equipment, and the introduction of concepts concerning the automation of electrical distribution systems are presented. In this work is presented the medium voltage distribution system of the Pici Campus, with the implementation of a power substation of 69-13,8 kV, three feeders outputs and nine reclosers throughout the campus distribution network. The study of the protections applied to the considered system has been accomplished with the aid of software EASY POWER, and the circuit parameters, short-circuit values and the methodology for the protection adjustments are presented. From these results, the automatic reclosing and circuit breaker failure with logic selectivity were parameterized in the relays SEL 751 and tested in the laboratory by simulating the electric system states, emulated with the help of a test system. The results were satisfactory and ensure selectivity and coordination between the busbar protection and the feeder protection of the power substation of 69-13,8 kV.