Ice accident is the important factor affecting the normal operation of transmission lines.In this paper,first of all,heat balance influence factors in the icing process of transmission lines are analyzed to conclude that the convective heat transfer is the most important heat loss factor.A numerical simulation is conducted for two factors:convective heat transfer and conductor joule heat,and it is found that the heat loss of the glazed iced conductor increases with the increase of wind speed and ice thickness,and the heat convection of the eccentric circular ice is slightly smaller than that of the circular ice.Furthermore,the heat loss of each part of the ice surface is statistically analyzed,and the result shows that when the wind speed is less than l0 m/s and ice thickness is less than 5 mm,the thermal dissipation value of the windward LGJ95 in the-45～45°area reaches 35％～35％,thus the local heat loss in the windward area is much more than the mean value,which plays a positive role in icing growth.%覆冰事故是影响输电线路正常运行的重要原因.对输电线路覆冰过程中各热平衡影响因素进行分析,得出对流换热为该过程最重要的热损耗原因.针对对流换热、导线焦耳热两大影响因素开展数值模拟,得出雨凇覆冰导线的热量损失随风速及冰厚增加而增加,偏心圆形覆冰对流换热数值略小于圆形覆冰.对覆冰表面各部分的热量损失进行统计,结果表明,当风速小于10 m/s、覆冰厚度小于5 mm时,LGJ95导线迎风侧-45～45°区域的热耗散值达到了总量的35％～48％,热量散失远大于平均值,有利于覆冰冻结增长.
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