Abstract：Based on the heat conduction equation, fluid flow governing equation and radiation heat transfer equation, a multi-physics coupled mathematical model is established, in which the convec- tion heat transfer problem between solid and fluid is solved by wall function for simulating the temperature in the switchgear. The joule heat losses of current-carrying conductors and shell are calculated respectively including skin, proximity and eddy current effects with the use of 3D edge element method. The three dimensional thermal and fluid field in a type of switchgear filled respec- tively with SF6, N2, and air are calculated numerically by the finite volume method and the hexahedral grid and analyzed to discuss the feasibility of using air or N2 as the substitution of SF6. The results show that the temperature field and fluid field in three gases are similar in the switchgear. The temperature rise of current-carrying loop is the highest in SF6 and is approximately equal in the N2 and air. The flow velocity in SF6 is the highest and is the lowest in the air. So the conclusion could be made that under the qualified withstand voltage air or N2 could replace SF6 as the insulating gas of switchgear from the perspective of temperature rise.
张俊民,高荟凯,冯昊. 三种绝缘气体下开关设备的温度场及流场对比与分析[J]. 电工技术学报, 2015, 30(6): 155-161.
Zhang Junmin,Gao Huikai,Feng Hao. Analysis of Thermal and Fluid Field of Switchgear in Three Insulating Gases. Transactions of China Electrotechnical Society, 2015, 30(6): 155-161.
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