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TRANSFORMER OILS OF IMPROVED THERMAL CONDUCTIVITY AND BREAKDOWN VOLTAGE

Description: The process of preparation of transformer oils of significantly improved properties based on nanodispersions of base oil, iron oxide nanoparticles and polymer surfactants has been developed and optimized.

The process of preparation of transformer oils of significantly improved properties based on nanodispersions of base oil, iron oxide nanoparticles and polymer surfactants has been developed and optimized. With the addition of a very small amount of Fe(II)/Fe(III)-oxide nanoparticles of 0.01 vol. % in transformer oil an improvement in thermal conductivity of more than 17 % and a breakdown voltage of more than 6 % in relation to base oil was achieved. The addition of a tailored polymeric surfactant ensured long-term stability of the nanodispersion system, that is, improved transformer oil. The polymeric surfactant is synthesized in a laboratory by using several different types of monomers and according to the composition of base transformer oil. Thus, an optimal molecular interaction in the system as well as homogeneity in a wide range of operating conditions was accomplished. Advantages: Improved thermal conductivity and breakdown voltage of oil. Used transformer oils after a long service life of 20-30 years can be materially, energetically and chemically recovered, with the simple separation of added nanoparticles that are magnetic, in a completely harmless way. This improvement can be applied to both renewable and biodegradable transformer oils. Purpose: Power transformers in electrical grids.

Organisation: University of Zagreb, Faculty of Chemical Engineering and Technology, Zagreb

Innovator(s): Prof. Ante Jukic, PhD; Assist. prof. Fabio Faraguna, PhD; Ivana Soljic Jerbic, PhD; Ivana Mrsic; Lucija Lovreskov

Category: Chemistry

Country: Croatia (Hrvatska)

Gold Award