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

Carlos Javier Renedo, Agustín Santisteban, Félix Ortiz, Cristian Olmo and Alfredo Ortiz
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Carlos Javier Renedo: Electrical and Energy Engineering Department, University of Cantabria, 39005 Santander, Spain
Agustín Santisteban: Electrical and Energy Engineering Department, University of Cantabria, 39005 Santander, Spain
Félix Ortiz: Electrical and Energy Engineering Department, University of Cantabria, 39005 Santander, Spain
Cristian Olmo: Electrical and Energy Engineering Department, University of Cantabria, 39005 Santander, Spain
Alfredo Ortiz: Electrical and Energy Engineering Department, University of Cantabria, 39005 Santander, Spain

Energies, 2018, vol. 11, issue 2, 1-14

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.

Keywords: power transformer; efficiency; seasonal efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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