Original scientific paper
CFD SIMULATIONS OF OIL IMMERSED AND DRY TYPE TRANSFORMERS
Ralf Wittmaack
; Siemens E T TR EU PN EN4
Abstract
At Siemens the in-house CFD code UniFlow is employed to investigate fluid flow and heat
transfer in oil immersed and dry type transformers as well as transformer components like windings,
cores, tank walls, and radiators. We outline its physical models and numerical solution methods.
As an oil transformer application of the method, the simulation of oil flow and heat transfer in 5
windings of a prototype transformer with ONAN/ONAF cooling mode is described. It corresponds to a
heat run test with the total losses.
Furthermore, we outline an application to an AFWF cast resin transformer prototype operated at ships
in an enclosure. The ventilator driven air flow is cooled by sea water. In addition to the LV and HV windings the
core is simulated. Here also the heat radiation makes a significant contribution to the heat transfer.
Keywords
Thermal design; CFD; physical models; radiant heat transfer; numerical methods
Hrčak ID:
199031
URI
Publication date:
15.7.2017.
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