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Tuesday, 22 September, 2020, 10:30 a.m. - 12:00 a.m.

Special session on thermal engineering in advanced electrical devices cooled with biodegradable fluids

Aims of the special session

The organizers of the CPOTE2020 conference are pleased to invite to a special session dedicated to the H2020 project BIOTRAFO. The BIOTRAFO project analyses the effect of temperature on the designs of power transformers that use biodegradable esters as coolant, the environmental and fire performance of these liquids being also evaluated. These machines are very common in our power distribution systems. Since electricity is generated until it reaches households, it passes through an average of four transformers. Currently the liquid used in most of these machines is a petroleum derivative, since its good performance is well known. However, the environmental awareness of many companies is demanding new transformers that are cooled by esters of natural origin. In this framework, BIOTRAFO proposes a study that allows knowing the temperature in the windings of the transformer when using biodegradable liquids, which by their nature are more viscous. This temperature is a critical factor for the useful life of the transformer, due to the aging of dielectric solid materials. During the special session the results of the computational models of the temperature field in various units will be presented.

Scope of the special session
  • Reduce environmental impacts
  • Increase of safety (reduce fire risks)
  • Promote new innovative solutions
  • Promote natural oil for transformer cooling
  • Determine hot-spot temperature in disk-type windings
  • Define the cooling parameters of ONAN transformers
  • Simulate the thermal behaviour of transformers using complex numerical and reduced order approaches
  • Numerical study of 8.5 MVA disk-type power transformer cooled by biodegradable esters using coupled CFD-CFD and CFD-EMAG modelling
    Stebel Michał, Palacz Michał, Melka Bartłomiej, Bodys Jakub, Garelli Luciano, Rios Rodriguez Gustavo, Kubiczek Krzysztof, Lasek Pawel, Stepien Mariusz, Haida Michał, Pessolani Francisco, Amadei Mauro, Granata Daniel, Storti Mario, Smołka Jacek,
  • Thermal analysis of a low voltage winding of a power transformer working with natural ester and mineral oil
    Santisteban Agustin, Dorella Jonathan, Garelli Luciano, Storti Mario, Delgado Fernando, Ortiz Alfredo,
  • Measurement and analysis of power losses in sintered cores for power electronic devices in renewable energy systems
    Lasek Pawel, Stepien Mariusz,
  • Coupled electromagnetic and thermal models of the 315 kVA distribution transformer for mineral and biodegradable oils in different climate conditions
    Melka Bartłomiej, Palacz Michał, Stebel Michał, Bodys Jakub, Haida Michał, Garelli Luciano, Rios Rodriguez Gustavo, Storti Mario, Kubiczek Krzysztof, Lasek Pawel, Stepien Mariusz, Pessolani Francisco, Amadei Mauro, Granata Daniel, Smołka Jacek,

More info and the order of the presentations are on the detailed schedule

About the project

Title: Raising knowledge and developing technology for the design and deployment of high-performance power transformers immersed in biodegradable fluids


More information about the project is available at the website:

Selected project results

Geometry of 315 kVA distribution transformer used for numerical modelling of cooling process using mineral and natural oils

Geometry of 8.5 MVA power transformer model used for numerical modelling of the cooling process using mineral and natural oils

Geometry of power transformer disk-type windings for detailed investigation of the oil flow between low-voltage and high-voltage coils

Temperature field from the CFD model of distribution transformer cooled by mineral or biodegradable ester oils

Flow chart describing the data transfer between coupled CFD models of 8.5 MVA power transformer cooled in ONAN model and the reduced-order model of radiators

Temperature distribution from the CFD model developed for comparison of the winding cooling using mineral and natural oils
Project consortium and partners:
University of Cantabria (UC), Spain
University Carlos III of Madrid (UC3M), Spain
University of Manchester (UM), United Kingdom
University of Rome-Sapienza (UR), Italy
Silesian University of Technology (SUT), Poland
University of Stuttgart (US), Germany
Best Transformers (Best), Turkey
Sea Marconi (SM), Italy
Kyushu Institute of Technology (KT), Japan
National University of the Littoral (UNL), Argentina
University of Piura (UP), Perú
University of El Valle (UV), Colombia
Tadeo Czerweny (TC), Argentina
This work has received financial support from European Commission – Horizon 2020 Program - Marie-Sklodowska-Curie Actions (MSCA), Research and Innovation Staff Exchanges (RISE), BIOTRAFO project, Grant Agreement number: 823969, Horizon 2020 (H2020)-MSCA-RISE-2018.