ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Application of Upper Air Sounding Data to the Evaluation of Power Transmission Line IceCoating Accidents
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Abstract:
Large-area power transmission line icecoating accidents occurred in Zhejiang Province early 2008. And the upper air sounding data are used due to the lack of representative icecoating observations. The configuration of temperature and humidity factors at various altitudes in the lower atmosphere is also obtained. It reveals that combination of continuously low temperature and corresponding high humidity fits the investigation of transmission line incidents so well that it can be regarded as a basic criterion for icecoating prediction and early diagnosis. The evaluation indicates that, from middle January to early February in 2008, the continuous occurrence of low temperature accompanied by high humidity was the main factor of power transmission line icecoating accidents. In such severe air conditions, the correlation between intensity of icecoating and altitude is proved to be positive in the lower boundary layer. Comparisons with the similar historic weather records point out that, the unprecedented severe meteorological conditions resulted in the extremely severe ice-coating accidents in early 2008.
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