基于3D有限元模型的架空输电线路融冰电流计算

给出了架空输电线路直流融冰所涉及的两个重要参数:最小融冰电流和最大允许融冰电流的概念及计算方法。基于有限元法,以500kV架空输电线路常用的LGJ300/40钢芯铝绞线为模型,建立了覆冰导线3D热-电耦合仿真模型,计算出不同气候条件下、不同覆冰厚度的最小融冰电流,以及导线正常运行所允许的最大融冰电流,讨论了各种气候情况下融冰电流调节裕度,总结了最小融冰电流随环境条件和覆冰厚度的变化规律,可为运行人员提供重要的决策依据。

Calculation of Ice-melting Current of High Voltage Overhead Line Based on 3D Finite Element Model

Two critical concepts involved in direct current ice-melting technique for high voltage overhead line,the least ice-melting current and the max allowed current were presented.According to the configuration of LGJ300/40 wire,a 3D thermal-electrical coupled simulation model of wire covered with ice was constructed based on finite element method（FEM） using ANSYS software.The least ice-melting current at different environmental temperature,wind speed,and thickness of ice-covered was calculated,so did the max allowed current in case of no ice-covered.The change range of allowed ice-melting current was calculated in different environmental condition.The developing tendency of the least ice-melting current versus environmental condition and thickress of ice-covered was discussed as well,which provided important referential data for operation staff.