基于有限元分析的埋地电缆温升影响因素研究

Study on the influence factors of temperature rise in underground cable based on finite element analysis

针对YJLW02 66/110 k V 1*1000型电力电缆运行时,电缆载流量与电缆间距如何影响电缆发热的问题,研究IEC标准中关于电缆损耗的有关计算方法,以电缆导体损耗、绝缘介质损耗与金属护套损耗作为电缆内部发热源,利用有限元分析软件ANSYS建立单回路埋地电缆土壤直埋、排管2种敷设方式的模型,并进行仿真分析。结果表明:随着电缆载流量的升高,电缆导体温度会加速升高;随着电缆间距的增大,电缆导体温度逐渐降低,且当电缆间距大于0.2 m时,温度变化会趋于某个稳态值。

When the power cable is working,the cable temperature is changed because of cable ampacity and cable spacing. The cable loss calculation formula based on the IEC standard was studied in this paper. The cable conductor loss,the insulation dielectric loss and metal sheath loss were taken as the cable internal heating source,the mode for different installation methods was established based on the finite element analysis software ANSYS,which one was single loop buried cables and another was pipe laying. The simulation results show that the temperature of cable conductor will increase when the cable load increases; the conductor temperature will reduce gradually when the cable spacing increases,and when the cable spacing is greater than 0.2m,the temperature changes will tend to a steady state.