Browsing by Author "Altamirano Solís, Anahí Michelle"

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    “Evaluación del sistema de protecciones en las líneas comprendidas entre la Subestación San Rafael, La Cocha, El Calvario, Illuchi 1 E Illuchi 2 de la Empresa Eléctrica Cotopaxi”
    (Ecuador: Latacunga: Universidad Técnica de Cotopaxi: (UTC), 2024-08) Altamirano Solís, Anahí Michelle; Chiliquinga Ulloa, Micaela Alexandra; Proaño Maldonado, Xavier Alfonso
    The research evaluated the protection coordination in the Cotopaxi Electric Company's sub-transmission system, focusing on the lines between the substations San Rafael, La Cocha, El Calvario, Illuchi 1, and Illuchi 2. First, the study area was delimited, and the existing protections were analyzed. A short-circuit analysis revealed that the ANSI 50 and ANSI 51 protections, designed for a radial system, were inadequate for the new meshed topology due to the bidirectional nature of the current flow, leading to the disconnection of elements not affected by faults. Additionally, it was observed that protections were only present at one end of the lines, hindering timely fault clearance. To overcome this, a new coordination scheme was presented involving the implementation of directional relays ANSI 67/67N at both ends of the lines and transformers, along with distance protections ANSI 21/21N on the critical Illuchi 1 – El Calvario and Illuchi 2 – El Calvario lines. Parameters such as iPickup and operating time were adjusted to ensure selective operation. The new coordination maintained a minimum discrimination margin of 0.2 seconds between the protection curves, significantly enhancing the system’s selectivity and sensitivity.