Analysis of Thermal Field in Mineral Transformer Oil Based Magnetic Fluids
M. Kostereca, J. Kurimský a, R. Cimbala a, Z. Čonka a, L. Kruželák a, M. Rajňák b, M. Timko b, P. Kopčanský b and B. Vargová c
aDepartment of Electrical Power Engineering, Technical University of Košice, Faculty of Electrical Engineering and Informatics, Mäsiarska 74, 041 20 Košice, Slovakia
bInstitute of Experimental Physics, SAS, Watsonova 47, 040 01 Košice, Slovakia
cInstitute of Parasitology SAS, Hlinkova 3, 040 01 Košice, Slovakia
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Growing interest in the use of magnetic fluids in power systems especially in transformers as insulation and a coolant is nowadays registered. Magnetisable nanofluids, which are used in cooling systems as an alternative to mineral transformer oil, are characterized by lower concentration of magnetic nanoparticles. The magnetic fluid has better heat transfer and dielectric properties such as breakdown than mineral transformer oil and it can be used to improve heat flow, thereby increasing the ability of the active parts to resist failures such as electromagnetic pulses. External magnetic field may be used for forced circulation of magnetic fluid. Magnetic force inside the magnetic fluid can be adequately controlled by adjusting the incident magnetic field. This paper presents thermal distribution, fluid flow and cooling ability of mineral transformer oil and magnetic fluid based on mineral transformer oil. The concentration of Fe3O4 magnetic nanoparticles is 0.15% volume of mineral transformer oil. The thermal field is generated by a steel conductor. Thermal distributions in mineral transformer oil and magnetic fluid are investigated and differences for both cases are discussed in the paper.

DOI: 10.12693/APhysPolA.131.937
PACS numbers: 44.25.+f, 44.27.+g, 47.11.Fg, 47.65.Cb