Three-phase recloser time delays determination in 138 kV and 46 kV lines of the Empresa Eléctrica Quito

The present study is performed with the objective of applying an adequate methodology to determine the operating time delays of three-phase breakers, to attain automatic high-speed reclosing in radial and ring lines at the levels of 46 kV and 138 kV of the Empresa Eléctrica Quito (EEQ). This helps maintaining continuity service with acceptable levels of quality after a transient fault has occurred. For this, an analysis is made on the electrical system of the EEQ with emphasis on the voltage levels mentioned above, to determine which lines have been affected due to transient, either radial or ring lines that are important within the electrical system and a reconnection is possible. By analyzing the characteristics of the breakers associated with the lines, both the breaker sequence of operation given in the nameplate and the time established between the opening and closing of the breaker contacts after the occurrence of one failure, coupled with the arc deionization time for each voltage level, allows determining the three-phase reclosers time delay of the lines. Finally, based on the results obtained from simulations, the appropriate reconnection times were determined in the 46 kV and 138 kV lines of the EEQ that ensure continuity and quality of electric service.