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Energies 2018, 11(2), 419; https://doi.org/10.3390/en11020419

Evaluation of the Optimal Connection of Power Transformers in the Substations of a Hospital

Electrical and Energy Engineering Department, University of Cantabria, 39005 Santander, Spain
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Received: 2 January 2018 / Revised: 22 January 2018 / Accepted: 6 February 2018 / Published: 11 February 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

Transformers are installed in power distribution systems to perform changes in supply voltage. Large consumers often have several transformers installed in parallel to ensure continuity of supply in the event of failure. These machines can achieve very high efficiency, but their efficiency is not constant since it depends on the power demanded at each time. Therefore, the level of efficiency that correspond to the operation of a specific transformer depends on two factors: machine technical characteristics and electrical load. In this work, the authors have proposed a methodology which shows the optimal number of transformers to be connected at each period in the substations of a large Spanish hospital, in order to achieve the maximum seasonal efficiency of these machines. The results of the energy saving are determined with respect to the current situation, in which all the transformers are permanently connected. On the other hand, the European Union has established a new regulation that sets the minimum energy efficiency requirements for new power transformers. This efficiency improvement is proposed to be applied gradually in two stages, a first limit came into force in 2015, while a more restrictive approach will appear in the year 2021. This work has also studied the potential energy savings that would occur when the substations of the hospital have more efficient transformers complying with the new European Regulation 548/2014. View Full-Text
Keywords: power transformer; efficiency; seasonal efficiency power transformer; efficiency; seasonal efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Renedo, C.J.; Santisteban, A.; Ortiz, F.; Olmo, C.; Ortiz, A. Evaluation of the Optimal Connection of Power Transformers in the Substations of a Hospital. Energies 2018, 11, 419.

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