220 kV单芯交流电缆蛇形敷设下热机械效应有限元分析

Finite element analysis of thermo-mechanical effect of 220 kV single-core AC cable in serpentine laying

为了获取蛇形敷设下220 kV单芯交流电缆发生热机械效应后的受力情况,利用有限元分析方法进行了建模和仿真。根据现场工况和电缆结构特点建立了相邻两个夹具之间的电缆二维模型,利用热机械耦合法分析了电缆在额定载流量下的温度分布和应力分布,并从数值上分析了不同位置处的应力情况。结果表明,电缆中间自由段部分的应力明显小于两端,铜导体和铝护套在端部的应力超过了它们的屈服强度,容易发生危险。此研究可为实际敷设和日常巡检提供理论和数据参考。

In order to obtain the thermodynamic effect of the 220 kV single-core AC cable under serpentine laying,the finite element analysis method was used for modeling and simulation.According to the field conditions and cable structure characteristics,a two-dimensional model of the cable between two adjacent fixtures was established.The temperature distribution and stress distribution of the cable under the rated current capacity were analyzed by thermomechanical coupling method,and the values of different positions were analyzed numerically.The results show that the stress in the free part of the cable is significantly less than the two ends,and the stress of the copper conductor and the aluminum sheath at the end exceeds their yield strength,which is prone to danger.This study provides theoretical and data references for practical laying and routine inspections.