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Browsing by Issue Date, starting with "2022-09-09"

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  • Power quality and modeling analysis of a university campus electrical distribution system
    Publication . Ferrolho, César; Barata, Filipe; Gamboa, Paulo
    For a few years now, electrical power quality has been a topic of interest and discussion, mainly due to issues regarding costs, continuity of service and electrical installation energy efficiency. The lack in electrical power quality can reveal itself in different ways, in reactive power costs, in frequent tripping of protections, in overheating and overloads of equipment and cables, in the significant shortening of capacitor lifespans, and, on power grid resonance events. This paper makes an electrical power quality analysis on Instituto Superior de Engenharia de Lisboa (ISEL) school campus, more precisely, two transformer substations and several building electrical distribution boards that make up the campus’ electrical power grid. The acquired data enabled the graphical display of several electrical parameters, and their subsequent quantitative and qualitative analysis, regarding legislation and standards, namely, NP EN 50160; IEC 61000-2-3 and IEEE Std 1159-2019. In the paper, a Matlab/Simulink model of ISEL campus’ electrical power grid was developed, so that, when anomalies are identified, it will be possible to analyze and verify, through simulation, the effect that different solutions produce to mitigate them.
    2022-09-09Conference object Open access Show more
  • Public mobile wideband networks interference impact assessment on railways GSM-R network
    Publication . Rouco, André; Cota, Nuno; Beire, Ana Rita; Serrador, António
    This paper presents a field study relating to the impact that public operator cellular networks such as UMTS (Universal Mobile Telecommunication System), LTE (Long-Term Evolution), and 5G-NR (5G - New Radio) have on railway GSM-R (Global System for Mobile Communications – Railway) networks. The validation of the interference calculation relied on actual network measurements taken along railway lines using a dedicated probe. Emissions from public networks, in some scenarios, have been shown to affect GSM-R networks to a large extent. The developed algorithm is currently being used in real GSM-R network planning to mitigate this negative effect on base station coverage and service performance.
    2022-09-09Conference object Open access Show more