局部对流换热对输电线路高频激励融冰的影响

在覆冰导线高频激励融冰温度场的分析与计算中,局部对流换热对温度场及高频激励融冰模型有很大影响。对此,文中分析了高频融冰过程中的热量损失和对流换热的影响因素,通过Ansys有限元软件对高频激励融冰模型的电磁场和热分析与计算,揭示了局部对流换热对高频融冰模型温度场及其迎风侧和背风侧的影响,表明了局部对流换热使导线背风侧覆冰先融化脱落,迎风侧覆冰后融化脱落。覆冰导线外表面的温度随对流换热的系数增大而下降,下降速度随对流换热系数增大而减缓。该研究成果有利于进一步改进和优化高频激励融冰计算模型。

Effect of Local Convection Heat Transfer on High-frequency Excitation Deicing for Transmission Lines

In the analysis and calculation of the temperature field of the high-frequency excitation deicing,the local convection heat transfer has a great influence on the temperature field and the high frequency excitation deicing model.So the influence factors of heat loss and convection heat transfer in high-frequency deicing process are analyzed in the paper,and the electromagnetic field and thermal analysis of high-frequency excitation deicing are simulated by Ansys finite element software.The local convection heat transfer effect on high-frequency deicing model of temperature field and windward and leeward side are analyzed.The result shows the local convection heat transfer make the ice leeward side of wire melt off first,the ice windward side melt off.The temperature of the outer surface of the iced conductor decreases with the increase of the coefficient of convective heat transfer,and the decreasing speed slows down with the increase of the coefficient of convective heat transfer.It is propitious to further improvement high-frequency excitation deicing method and optimization of ice melting model.