Theoretical Study of Liquid Flow and Temperature Distribution in OF-Cooled Power Transformers

Uroš Plaznik (), Blaž Breznik and Borut Prašnikar
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Uroš Plaznik: Kolektor Etra d.o.o, Šlandrova ulica 10, 1231 Ljubljana, Slovenia
Blaž Breznik: Kolektor Etra d.o.o, Šlandrova ulica 10, 1231 Ljubljana, Slovenia
Borut Prašnikar: Kolektor Etra d.o.o, Šlandrova ulica 10, 1231 Ljubljana, Slovenia

Energies, 2024, vol. 17, issue 3, 1-14

Abstract: The objective of the paper is to analyse the effects of various geometrical and operating parameters on the liquid flow distribution in OF-cooled power transformers. Our investigation includes two cases: one with a simplified winding geometry and another that closely resembles the actual winding geometry. The analyses were carried out using computational fluid dynamics (CFD) and custom, internally developed thermo-hydraulic models. Our findings confirm that buoyancy forces rather than the pump drive the liquid flow within the windings of an OF-cooled power transformer. The results also show that the liquid flow distribution, which is influenced by the winding geometrical properties and liquid properties, has a significant impact on the hot-spot temperatures of the windings. The comparison between the results of the CFD simulations and the results of the simple model demonstrates a high level of agreement in calculating both the mass flow rates and temperatures.

Keywords: CFD; forced liquid flow; power transformer; thermo-hydraulic network model; winding hot-spot temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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