Abstract：Based on the heat conduction equation, fluid governing equation and radiation heat transfer equation; the coupled mathematical model of conduction, convection and radiation is established, the convection heat transfer problem between solid and fluid is solved by wall function; then the three dimensional thermal and fluid fields are calculated and analyzed. The hexahedral mesh is used in simulation; the differential equations are discretized and solved by the finite volume method. The 3D thermal field and fluid field distribution of 27.5kV GIS bus bar’s cabinet are shown. The result shows that the highest temperature part is at the three-position isolation switch, the temperature of the cabinet is made uniform and the heat transfer of the conductive loop is strengthened by the convection of the gas. The temperature rise test is done, and the computed temperature has good agreement with the results of temperature rise test, so it proves that this numerical method is reasonable.
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2011, Vol. 26 
