Estudio de coordinación de protecciones en el sistema de subtransmisión a 46 kV de la Empresa Eléctrica Quito considerando la conexión en paralelo de los transformadores T1 y T2 de la subestación Vicentina y la puesta en servicio de la línea Miraflores – Pérez Guerrero

Abstract

The Empresa Eléctrica Quito (EEQ) in order to improve security and increase the reliability indexes on it 46kV subtransmission system has opted for the parallel connection transformers T1 and T2 of the Vicentina substation by closing the link breaker on the 46 kV bar and the commissioning of the Miraflores - Pérez Guerrero subtransmission line. The topological change affects the protections coordination that are currently adjusted in the system due to a variation of the equivalent impedance of substation that causes a change in the short-circuit currents. On this basis is important to carry out a new protections coordination study in transmission lines and transformers, which are affected by the topological changes. Using DIgSILENT's PowerFactory software, the system used to study the power flows and short-circuit is modeled, in addition, routines are developed in DIgSILENT Programming Language for the protections coordination on subtransmission lines. The results reflect the effectiveness of the proposed protections coordination which allows protect the system against different failure events.