Experimental Study on the Critical Anti-icing Current and Ice-melting Characteristics of Large-sectional Conductors for UHV Transmission Line
In an artificial climate laboratory,the critical anti-icing current and ice-melting experiments for two kinds of large-sectional conductors of UHV transmission line,namely LGJ-720/50 and JL/G3A-900/40,were carried out to analyze the magnitude of critical anti-icing current under different meteorological conditions and its influencing factors.The characteristic curves between ice-melting time of large-sectional conductors and ice-melting current,ambient temperature,wind speed and thickness of ice-coating were obtained,and the varying rules between temperature both on the upper and lower surface of conductors and time in the ice-melting process were achieved.Study results show that the necessary and sufficient conditions when large-sectional conductors are in the critical state of ice-coating and no ice-coating are the temperature of conductor surface is a typical value and the freezing coefficient of water droplets is equal to 0.The rise of ambient temperature and fall of wind speed can make the critical anti-icing current decreased.The time for ice-melting of large-sectional conductors mainly depends on the ice thickness to be melted on conductor surface.Simultaneously,the lower the ambient temperature and the higher the wind speed,the longer the time for ice-melting will be.Before the ice fall off in the ice-melting process,the upper surface temperature of conductor increases gradually and the lower surface temperature oscillates at 0℃.After the ice fall off from conductors,the upper surface and lower surface temperature rise to a same stable value which is related to ambient temperature and wind speed.
large-sectional conductors UHV transmission line critical anti-icing current meteorological parameters ice-melting characteristics
HU Jianping FANG Zhen LU Jiazheng
State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment State Grid Hunan Electric Power Corporation of Disaster Prevention and Reduction center,Changsha,China
国际会议
重庆
英文
1-5
2017-09-25（万方平台首次上网日期，不代表论文的发表时间）