Browsing by Author "Solórzano Sánchez, Erick Elian"

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    Optimización en tiempos de operación en la coordinación del Relé 51
    (Universidad Técnica de Cotopaxi (UTC). Ciencias de la Ingeniería y Aplicads. Electricidad, 2026-10-14) Portilla Mora, Javier Alejandro; Solórzano Sánchez, Erick Elian; Proaño Maldonado, Xavier Alfonso
    In the present paper, the optimization of operating times of the 50/51 relay in a radial system was carried out using a Mixed-Integer Linear Programming (MILP) model within a Python–DIgSILENT PowerFactory co-simulation environment, which enabled the automation of the coordination. The Python algorithm extracted the topology, load currents, and short circuits. The linearization of the curves along with the HiGHS solver allowed minimizing the time dial settings while maintaining the required coordination time margin. The model dynamically assigned Overload Factors, examined the instantaneous unit 50 to avoid overreach, and accounted for faults involving Delta-Star connected transformers. The methodology was validated in the CIGRE MV and IEEE 33-bus systems equipped with ABB Relion REF615 and Siemens SIPROTEC 7SJ62 relays respectively, using the IEC Normal Inverse curve and the ANSI Normally Inverse curve, where the results showed selectivity in all coordination pairs for an established discrimination margin. In the comparative analysis of the results between the curves, a 34.05% reduction in the sum of operating times was evidenced in the ANSI curve compared to the IEC curve due to the characteristics of each of them.