Estudo de coordenação da proteção de um circuito alimentador de 13,8 kV

Abstract

The distribution electrical grid must be designed to ensure the continuity, reliability, and flexibility of energy supply to consumers. This can be planned with a protection system using automatic reclosers and relays that are properly set and, importantly, coordinated with each other. This thesis analyzed the coordination of the protection system of the electrical grid served by the 13.8 kV feeder circuit installed at the Água Verde substation in Curitiba, Paraná, named Guararapes Feeder. The electrical data of the circuit were obtained from the Geographic Database of Distribution (BDGD) provided by the National Electric Energy Agency (ANEEL), processed in QGIS software, and the circuit was simulated using OpenDSS software. From the simulation, short-circuit current values at the system's buses were obtained. The number of reclosers existing in the circuit was determined in the simulation, and their coordination was defined based on their Time Multiplier Settings (TMS). QGIS software was used to validate the obtained data. The results showed that it was possible to collect electrical data of the feeder circuit (nominal power, installed quantity, no-load and total losses) from the BDGD. With these data, the losses with and without load were calculated, and the nominal and maximum phase and neutral currents of the reclosers were simulated. The current settings of the instantaneous phase and neutral units of the reclosers were then calculated with the parameterization of the relays for the coordination of the existing reclosers in this circuit: 0.2 seconds for SE and R1 and 0.1 seconds for R2 and R3. The conclusion of this study validated the possibility of coordinating the protection system of medium voltage (13.8 kV) feeder circuits using data from ANEEL's BDGD and the OPENDSS and QGIS software.