@article{10902/20279,
year = {2020},
month = {11},
url = {http://hdl.handle.net/10902/20279},
abstract = {The very high-power transformer lifespan depends mainly on the temperature that cellulose insulation reaches during its operation. Traditionally, its cooling has been carried out using mineral oil as coolant. Nowadays, alternative ester-based liquids are under study as substitutes due to their better environmental and  re-safety properties. This paper compares the cooling capacity of two ester-based  uids with that of a mineral oil using a 3D numerical model of a 100 MVA low voltage winding of a power transformer with axial cooling system and ONAN cooling mode. Heat-run test results with mineral oil have been used to validate this model. As a  rst approximation, according to the comparison developed, esterbased  uids could replace mineral oils in this type of transformers when they are going to work in a range of powers close to the rated one.},
organization = {This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 823969. Also, we acknowledge the support of the Spanish Ministry of Science and Innovation by means of the National Research Project "Asset management of biodegradable-fluid-based transformers'' (PID2019-107126RB-C22) and the Universities and Research Council of the Government of Cantabria by means of the grant "Biodegradable fluids in electrical power transformers: solid dielectric impregnation and thermal modeling with THNM'', VP32, 2019-2.},
publisher = {Institute of Electrical and Electronics Engineers Inc.},
publisher = {IEEE Access, 2020, 8, 207054-207062},
title = {Use of alternative fluids in very high-power transformers: experimental and numerical thermal studies},
author = {Altay, Ramazan and Santisteban Díaz, Agustín and Olmo Salas, Cristian and Renedo Estébanez, Carlos J. and Ortiz Fernández, Alfredo and Ortiz Fernández, Félix and Delgado San Román, Fernando},
}