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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Uroš Plaznik & Blaž Breznik & Borut Prašnikar, 2024. "Theoretical Study of Liquid Flow and Temperature Distribution in OF-Cooled Power Transformers," Energies, MDPI, vol. 17(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:3:p:571-:d:1325737
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