A Research Of Drawing And Application Of Distribution Diagram Of Yunnan Ice Region Based On The Typical Ice Model Of Low Latitude Plateau Area

摘要

The international study of ice model mainly from the perspective of meteorology fluid mechanics, thermodynamics transmission line conductor and insulator ice mechanism research study of ice prediction model has been developed from Lenhard Kuoiwa simple conceptual model development experience model to Makkonen complex concept model and glaze rime hybrid numerical calculation model of freeze. Yunnan province is located in China's southwest, rolling within the territory of mountains, rivers, topography is complex, three-dimensional climate significantly, in climate resource is rich, meteorological disaster is frequent, influenced by monsoon climate, the prevalence of micro topography and microclimate characteristics; Yunnan line ice distribution characteristics of eastern Yunnan, Yunnan north southeast Yunnan wire ice mainly for glaze rime and mixed freezing, and northwest Yunnan is mainly for adhesion wet snow Is one of the areas hit hardest by the ice. Ice distribution can reflect the grid of ice in the area of distribution, further guidance inspect heavy ice monitoring and transmission lines deicing ice design application, reduce line ice disaster accident economic loss caused by ice, improve power grid ice resistance ability and the power supply reliability,This paper comprehensive analysis the Yunnan plateau region, the transmission lines ice distribution factors such as geographic conditions, climate type and on-the-spot investigation to collect typical data grid severe ice disaster in 2008, 1983, in ice model research results at home and abroad for reference, combining with the actual situation of Yunnan in northeast Yunnan, the corresponding ice model is constructed, This paper proposes a new model of ice coating in Yunnan province, which is suitable for studying the new ice model in Yunnan province. Detected in the weather station data for statistical analysis, using the computer on hd electronic topographic map, inductive areas of Yunnan power grid ice distribution, and taken as the basis of the division of ice, ice zoning map of different return period. Through in the new 500Kv DE Maoxian gold officer lines before the field site engineering feasibility study stage, according to the project line to choose the line path, in the ”Yunnan power grid ice distribution” to the first line of the path optimization and avoid ice marked lines need to focus on the path to the investigation of the ice area, fully do sufficient preparation before departure, greatly reduced the time of field reconnaissance, time reduced by about 1/3 of the original, but also improve the working efficiency and the quality of the project. Because Yunnan province special landform, geography, weather, climate, micro topography, and micro climate is numerous, Draught place, pass, canyons, air duct, windward area can cause tiny terrain conductor ice serious increase in local area, these areas of ice thickness can't, according to a broader range of meteorological data to determine when ice districts so the two ”micro” edit, finally get reasonable ice figure. Field test comparison test with many times, think theory model calculated results and the results have some discrepancy, but after altitude elevation and atmospheric circulation, the correction ”micro” two conditions, the result basically reflects the east and northeast Yunnan, Yunnan mountainous terrain upheaval and three-dimensional climate characteristics, the theory research of ice model is more reasonable. Through typical ice model, put forward a preliminary mastered the typical transmission line low latitude plateau area in Yunnan the formation law of ice, ice in Yunnan region distribution simultaneously provide basic data and model support, increased the application of ”practicality”. But transmission lines ice cover is a and the complex of the atmospheric physical processes, at the same time and the topography distribution and climate change have bigger relationship, must continue to carry out the statistical analysis of the actual ice, perfecting the model calculation model and the distribution of its ice.