Retrofit do sistema de proteção de uma subestação de 69kv

Abstract

The present work presents the retrofit of the protection system of an industrial electrical substation, which was built in 1993 and currently has technologically outdated equipment. In the course of the work, the steps taken to carry out this case study will be addressed in order to provide the efficiency of the substation protection system. Initially, the equipment that makes up the substation was surveyed and tests were carried out on the protection relays to analyze the actuation times, based on the results of the tests and the conditions found for the relays, it was proposed to replace the electromechanical relays with digital relays, adapting the relay panels medium voltage protection and implementation of the coordination and selectivity study. The battery bank and rectifier/charger were also replaced. The technical information of the substation devices and the short-circuit levels provided by the local concessionaire were collected to carry out the study, in order to make the protection system coordinated and selective, acting in such a way as to isolate only the place where the fault occurred. and keep the other equipment running. At the end of the work, a comparison was made between before and after the implementation of the retrofit, benefits achieved and challenges encountered.