Heat Flow Field Analysis on Cooling System of Electrical Control Switch Cabinet

The failure rate of distribution system at all levels can be reduced effectively by exploring the change law of temperature rise of electrical control switch cabinet (ECSC), and optimizing the design concept of the cooling system. These efforts can significantly promote the coordinated development of grids at all levels. However, the existing studies rarely discuss the temperature rise law under external factors or non-rated conditions. The factors affecting temperature rise have not been fully considered, not to mention the correlations between these factors. Likewise, few scholars have tried to optimize the design of the cooling system. Therefore, this paper carries out a heat flow field analysis on the cooling system of ECSC. Firstly, the design idea of ECSC cooling system was explained, and the design steps of ECSC cooling were presented. Secondly, a mathematical model was established for the motion of ECSC thermal fluid, based on the laws of conservation of mass, momentum, and energy. Thirdly, a turbulence model and a porous media model were constructed for ECSC heat flow field analysis, after fully considering multiple factors: the compressibility of the fluid, the construction of a special yet feasible problem, the precision requirement, the computing capacity, and the time limit. Finally, the uniformity of the flow field was measured by parameters like mean speed, coefficient of speed fluctuation, and cloud map of speed, the results of ECSC heat flow field analysis were obtained, and useful suggestions were provided for structural optimization.