Conceptual Design of the Cooling System for a 3D Oil-Immersed Distribution Transformer
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Abstract
This paper presents a conceptual design for the cooling system of a 3D oil-immersed distribution transformer operating at 100 kVA/22 kV. The cooling system consists of oil cooling and winding cooling. The heat generated inside the coil and the heat transfer area that connects the coil to the cooling fins of the transformer tank effectively carry heat away from inside the transformer to ensure that its internal temperature does not exceed the designed insulation value. The design boundary conditions also depend on the viscosity of the fluid inside the 3D transformer. The disparities in the average HV winding temperature-rise of 7%, the average LV winding temperature-rise of 4%, and the top oil temperature rise of 16% are all substantial. The results of the calculations align well with the test outcomes, indicating that the methods for building systems to vent oil-intermittent distribution transformers, as outlined in this work, are applicable.
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