Abstract
ABSTRACT A method of numerical thermal analysis of large oil-immersed transformer windings is presented. The analysis consists of two steps: first, the leakage magnetic field is solved in the windings; second, the basic and additional losses distribution is calculated simultaneously with temperature rise distribution in the cross-sections of individual coils allowing for special geometries and cooling conditions of different types of windings. An example of the analysis is given and the values calculated are compared with the results of factory tests.
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