Lattice Boltzmann method (LBM) scheme is adopted to simulate the heat transfer processes inside isolated phase and three-phase enclosure gas insulated switchgear (GIS) capsules. D2Q9 fluid flow and thermal Lattice Boltzmann equations (LBEs) are solved through streaming and collision processes. Buoyancy force driven by natural convection is considered by the Boussinesq model. Power losses and thermal boundary conditions are obtained from closed formulas. Numerical results by LBM simulations are compared with those from physical experiments and conventional CFD simulations. Results show that LBM scheme could provide a simple and efficient alternative tool in the flow-thermal simulation of GIS equipment with desirable accuracy. Thermal performances of GIS capsule filled with different insulation gas mixtures (SF6, N2, CF4, CO2, CF3I) are then analyzed. Results show that upper conductors of three-phase GIS has larger temperature rise than lower conductor due to the natural convection effect. Conductor temperature rise inside gas mixture increases with the increase of second gas (N2, CO2, CF4) fraction. The thermal performance of GIS capsule could be reduced with the presentation of insulation gas mixtures.

采用格子Boltzmann方法（LBM）方案模拟隔离相和三相封闭式气体绝缘开关柜（GIS）胶囊内部的传热过程。D2Q9流体流动和热格子Boltzmann方程（LBE）通过流和碰撞过程求解。Boussinesq模型考虑了自然对流驱动的浮力。功率损耗和热边界条件从封闭公式中获得。将LBM模拟得到的数值结果与物理实验和常规CFD模拟得到的数值结果进行比较。结果表明，LBM方案可以为GIS设备的流热模拟提供一个简单而有效的替代工具，并且具有理想的精度。装有不同绝缘气体混合物（SF6，N2，CF4，CO2，然后分析CF3I）。结果表明，由于自然对流效应，三相GIS的上导体的温升大于下导体的温升。混合气体中导体温度的升高随着第二气体（N2，CO2，CF4）的增加而增加。出现绝缘气体混合物会降低GIS胶囊的热性能。