Use of alternative fluids in very high-power transformers: experimental and numerical thermal studies

Autor: Agustín Santisteban, Cristian Olmo, Alfredo Ortiz Fernández, Fernando Delgado, Ramazan Altay, Felix Ortiz, Carlos J. Renedo
Přispěvatelé: Universidad de Cantabria
Rok vydání: 2020
Předmět:
Zdroj: IEEE Access, 2020, 8, 207054-207062
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
IEEE Access, Vol 8, Pp 207054-207062 (2020)
Popis: 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. 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.
Databáze: OpenAIRE