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All Journal Bulletin of Electrical Engineering and Informatics
José Ricardo Nuñez-Alvarez
Universidad del Magdalena
Electrical & Electronics Engineering

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Three-phase voltage dips in load nodes of the electrical network of the Santiago de Cuba province measure for its correction José Ricardo Nuñez-Alvarez; Janette Cervantes-Oliva; Ramon Antonio Zambrano-Mero; Hernan Hernández-Herrer; Yolanda Llosas-Albuerne
Bulletin of Electrical Engineering and Informatics Vol 15, No 1: February 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v15i1.10172

Abstract

The growing need to supply quality electrical energy to end-users has given rise to various studies and research on the technical parameters that this energy should possess. In addition, many users perceive that many of the problems in the operation of their household appliances are related to the quality of the electrical energy that reaches their homes. One of the fundamental problems affecting the quality of electrical power is the so called voltage dips, which are nothing more than disturbances of great relevance due to their direct consequences, secondary effects, and frequency of occurrence. In this research, a study is conducted to evaluate the occurrence of three-phase voltage dips in a simplified electrical network in Santiago de Cuba, Cuba. As a result, the Santiago Norte substation presents the most detrimental behavior. In addition, 50% of the simulations performed on the behavior of the Santiago East Substation, which handles a voltage of 13.8 kV, showed that it is the substation where the deepest voltage dips occur. Based on the results obtained, it has been decided to change the transformer tapping of the affected substations to reduce the occurrence of voltage dips and ensure stable operation in the event of three phase faults in the power system under analysis.
Geographic information systems, practical experiences in higher education María Rodríguez-Gámez; Antonio Vázquez-Pérez; Carlos Gustavo Villacreses-Viteri; Jorge L. Macias-Ramos; Víctor Alfonso Martínez-Falcones; Xavier Horacio Valencia-Zambrano; José Ricardo Núñez-Álvarez
Bulletin of Electrical Engineering and Informatics Vol 15, No 5: October 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v15i5.11745

Abstract

Geographic information systems (GIS) are technological tools for capturing, storing, analyzing, and visualizing geospatial data. This study presents the development and educational implementation of the Sistema de Información Geográfica para el desarrollo Sostenible (SIGDS) or geographic information system for sustainable development, an open-source geoportal integrating renewable energy assessment, smart-grid monitoring, and disaster-risk management at the Technical University of Manabí, Ecuador. A mixed-methods approach was adopted, combining GIS implementation, spatial database development, root mean square error (RMSE)-based validation, and educational evaluation through a structured survey administered to 77 engineering students. Survey reliability was confirmed using Cronbach's alpha (alpha=0.84). GIS validation revealed positional and thematic discrepancies of less than 5%. Results indicate that 85% of users reported improved interdisciplinary understanding, while spatial problem-solving performance increased by approximately 20% compared with conventional instruction. Survey scores revealed strong perceptions of employability enhancement (4.62/5), interdisciplinarity (4.35/5), and acceptable accessibility (3.88/5). The proposed geoportal contributes to higher education by providing a replicable framework for integrating renewable energy planning, disaster resilience, and geospatial analysis into engineering curricula. The platform also supports real-time monitoring and decision-making processes for sustainable territorial development.
Co-Authors Antonio Vázquez-Pérez Carlos Gustavo Villacreses-Viteri Hernan Hernández-Herrer Janette Cervantes-Oliva Jorge L. Macias-Ramos María Rodríguez-Gámez Ramon Antonio Zambrano-Mero Víctor Alfonso Martínez-Falcones Xavier Horacio Valencia-Zambrano Yolanda Llosas-Albuerne