中文摘要：

电网冰区等级划分是电网建设的重要环节之一。电网冰区等级划分过低,有可能导致输电线路无法抵御覆冰危害,造成断线甚至倒塔等现象;冰区等级划分过高,会造成线路建设、运维及改造成本升高,导致资源的浪费。为了科学合理地划分电网冰区等级,讨论了5种电网冰区分级方法,包括经验调查法、覆冰数据法、CRREL模型法、气象参量回归法、局地地形-气象影响覆冰等级模型法,以及各种方法的分级步骤和使用特点。

英文摘要：

The classification of icing areas is one of the critical steps of the power grid construction. If the design ice thickness is underestimated,power transmission lines may not be able to withstand the influence of accreted ice,which might result in transmission line breaking or even tower collapse. On the other hand,if the design ice thickness is overestimated, the cost of construction,maintenance,and reconstruction may be increased to result in resources waste. With the aim of reasonable classification of icing area for power grid,five classification methods were discussed,including method of experience investigation,method of icing data,method of CRREL model,stepwise regression method of meteorological parameters,and model method of local topology-meteorology influence on icing classification. Finally,the classification steps and application features were discussed.