Abstract
One of the most important parameters governing a transformer’s life expectancy is the hottest spot temperature (HST) value. The classical approach has been to consider the HST as the sum of the ambient temperature, the top-oil temperature rise and the hottest spot to top-oil temperature gradient. This paper presents temperature distribution in windings of power oil transformers. The authors propose a numerical method based on heat transfer theory using the finite element method and they only need to solve the heat conduction equation. Transformer oil is assumed to be nearly incompressible and oil properties such as thermal conductivity, specific heat, viscosity and density vary with temperature. The transformers selected for simulation were a 22.5 MVA transformer with oil natural and air natural cooling, and a 32 MVA transformer with oil natural and air-forced cooling. A comparison of the authors’ results with those obtained from finite integral transform confirms the validity and accuracy of the proposed method.
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