IEEE Transactions on Dielectrics and Electrical Insulation · 2007 · 32 citations · 12 references
EngineeringMechanical EngineeringComputational Heat TransferHeat TransferThermal AnalysisHeat FlowHeat Transfer In FluidsHeat Transfer ModelingThermal DesignThermal ManagementThermal SimulationCooling System Performance AnalysisDuct FlowHeat Conduction In WindingsHot Spot Temperature PredictionOvershootTemperature Rise AnalysisTransformer ModelsWinding Thermal Analysis
The objective of this paper is to introduce a general model of hot-spot temperature rise calculation for the non-directed flow windings in order to explain the thermal overshoot phenomenon. The model employs heat transfer principles and hydrodynamics, in which the duct oil flow velocity is taken into account, and is validated using experimental results obtained for step changing load current on a oil natural-air natural (ONAN) cooling mode, 40 MVA transformer. The thermal overshoot phenomenon is analyzed by simulation for a 20-MVA-ONAN-cooled unit and a 40-MVA-ONAN-cooled unit.
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