Simulation and Diagnosis of a Continuous Ice Covering Event on UltraHigh Voltage Line in Hebei Province
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Abstract:
Based on the observation data from 142 national meteorological stations in Hebei Province and the case data of conductor icing provided by the electric power department, the spatial characteristics of the historical conductor icing in Hebei Province are being analysed. It is found that the southern coast of Hebei Province and the northeast of Zhangjiakou mainly experience rime icing, and there is a small amount of glaze icing in the northeast of Xingtai and the east of Cangzhou. The weather circulation of 15 typical cases in November 2015 is systematically analysed. The cold air which causes the disaster is spreading from north to south, and the airflow moving from west to east is getting superimposed in the middle and late stages. In the key region, there is a mixture of snow and water as well as obvious wind shear in the lower troposphere, and a "negative-position-negative” temperature anomaly stratification distribution in the middle troposphere. The upward movement in the thermal circulation provides favourable conditions for ice covering. Based on meteorological observation data, a prediction model of hourly ice thickness is established, which comprehensively considers the growth, maintenance and ablation processes of wire ice coating. It is found that the model can better capture the influence of the meteorological conditions on the icecovering process of conductors, and can objectively reflect the spatial and temporal distribution characteristics of ice-covering thickness, thus providing refined data support for ice-covering monitoring and early warning.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.