The data collected on the transmission lines of Central China Power Grid from 2009 to 2013 in Hubei Province,the MICAPS meteorological data,the atmospheric soundings,and the NCEP reanalysis data are analyzed to investigate the synoptic situation,the duration of the wire icing,and the inversion layer during the wire icing.Results show that the upper-level circulation during the wire icing process can be divided into three types:Small transverse trough development-oriented type,transverse trough type,and eastward-moving low trough type.The occurrence frequency of each type is 43.8％,31.2％,and 25％,respectively.Wire icing mainly occurs in January,February,November,and December and the average monthly icing hours in each individual month are 65 h,42 h,11 h,and 9 h.The icing processes can be divided into two types:Precipitation icing and foggy icing.A shear of wind direction from north to south could be found in the layer between 900 bPa and 700 hPa when precipitation icing occurs.A far more thick inversion layer could be developed,which is favorable for the maintenance and development of the icing process.%利用2009～2013年冬季华中电网电线覆冰在线观测系统对湖北省500kV高压输电线路积冰状况进行实时观测获取的资料,结合MICAPS常规气象资料、探空数据及NCEP再分析资料,对湖北形成积冰的天气形势、积冰持续时间以及形成积冰的逆温层结进行研究.结果表明:积冰的高空环流形势主要是小槽发展型、横槽型和低槽东移型3类,分别占43.8％、31.2％、25％;电线积冰主要发生在每年的1月、2月、11月、12月,月平均积冰时数分别为65、42、11、9;积冰可分为降水型积冰和云雾型积冰,降水型积冰过程中,900～700 hPa高度间存在由北至南风向切变,冷暖空气交汇形成愈加深厚的逆温对降水积冰维持与发展起到重要的作用.
展开▼
