基于有限元分析的开关柜温度场研究与优化

Research and Optimization of Temperature Rise of Switch Cabinet Based on Finite Element Analysis

12kV大电流开关柜广泛用于配电网中,一般采取强迫对流的方式进行散热。文中基于有限元仿真技术和温升试验研究了开关柜在强迫对流条件下的散热过程,分析了开关柜的散热能力。通过对开关柜三维建模、热源计算和边界条件设立仿真模型,分析了开关柜温升和气流场分布情况,在降低成本和改善散热通道的基础上对开关柜进行了散热优化设计,并通过温升试验进行验证。研究结果表明:将电缆室横流风机鼓风换为等风量的轴流风机鼓风后,通过优化散热通道,开关柜温升符合国标温升要求,降低了开关柜的成本。

The process and capacity of heat dissipation of the 12 kV high-current switch cabinet were studied under forced convection condition via the finite element simulation technology and the test of temperature rise. Through three-dimensional modeling of the switch cabinet, calculation of heat sources and setting of boundary conditions, the distributions of temperature rise and airflow field of the switch cabinet were simulated. Optimum design of thermal dissipation of the switch cabinet was carried out on the basis of lower costs and improved cooling channels, and was verified with the test data. Results indicate that through optimizing the cooling channel by substitution of axial flow fan in cable room for cross flow fan with the equal air volume, the temperature rise of the switch cabinet is in line with the temperature rise requirement in the national standard, and the cost of the switch cabinet is reduced.