基于有限元分析的强迫对流条件下开关柜温升特性研究

Study on Temperature Rise of Switch Cabinet Based on Finite Element Analysis under Forced Convection Conditions

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。为研究开关柜在强迫对流条件下的散热过程,基于有限元仿真技术,分别分析了强迫鼓风和抽风两种条件下开关柜的散热能力。通过对开关柜进行三维建模、热源计算和边界条件设立,仿真分析了开关柜在强迫鼓风和抽风条件下的温升分布及气流场分布情况,并与试验结果进行对比。结果表明,开关柜在两种强迫对流条件下散热效果均较好,温升符合国标温升要求,但不同的散热方式对开关柜温升和气流场分布影响较大。

12kV high-current switch cabinet is widely used in distribution networks,which generally reduces the temperature rise by the way of forced convection.In order to study the heat dissipation process of the switch cabinet under the condition of forced convection,the heat dissipation capacity of the switch cabinet under the conditions of blast and ventilation were analyzed separately based on finite element simulation technology.Through the three-dimensional modeling of the switch cabinet,the calculation of heat sources and the establishment of boundary conditions,the distributions of temperature rise and the airflow field of switch cabinet under these two conditions were simulated and analyzed,and verified with the test results.The results indicates that the cooling effect of switch cabinet by the way of forced convection is better,and temperature rise is in line with the national standard temperature requirements,but different heat dissipation mode have a greater impact on temperature rise and airflow field distribution of switch cabinet.