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摘要
Atmospheric icing on in-service insulators of transmission lines might be a guide to artificial icing experiments in a climate chamber.Ninety two natural icing events of in-service insulators from database of Disaster (Icing) Warning System for Transmission Lines in China Southern Power Grid are investigated.These events are monitored at Yunnan,Guizhou,Guangxi and Guangdong four provinces from November,2012 to February 2013.Natural icing morphologies on in-service insulators could be classified into glaze,light rime,rime,heavy rime,partial rime,and snow,based on the morphological characteristics of the severest icing image for each event,which are described and presented in this paper.Glaze,rime and partial rime account for majority in the statistical icing events.A transition or an overlap of two or three morphologies are found within several events,and a common segmented ice detachment for long insulator strings during ice-melting.Typical changing curves of micrometeorological parameters and maximum tension during the icing and ice-melting process are studied for six morphologies.The results show the changing curve of maximum tension could express the icing condition,the natural ice-melting,and the artificial ice-melting for in-service insulators.Statistical data such as the maximum Th,the minimum Tl,and the average Ta temperatures during the icing and the ice-melting process for each event are investigated,the lower and the upper quartiles,and the average level of Ta for glaze,rimes and snow are also done.The results show that the average level of Ta for the rimes and the snow are -2.9℃ and -2.2℃ respectively,indicating a dry growth,and that for the glaze is -1.2℃,indicating a wet growth.
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