Rime icing of a 420 kV transmission line Sima – Dagali (Finseskaret, Norway)
Photo: S.E. Hagen
When an overhead power line is either exposed to a high amount of icing, or covered by wet snow, or affected by strong winds, disturbances to the power supply may arise. In extreme cases it may even result in structural damages or even tower collapse. All power lines need to be designed to withstand the local climatic conditions, including extreme loads caused by wind and icing. On the other hand, over-engineering is expensive, and represents an unnecessary economical cost to the society. Proper design of the power line system is therefore critically dependant on knowledge about the local climatic conditions.
Kjeller Vindteknikk has several years of experience with the calculation of the climate loads for design of power lines. We are unique in the world with our specialist knowledge regarding the application of detailed meteorological models combined with various analyses of local wind and icing conditions. We map extreme values of wet snow, rime icing and wind, and we analyze to which extent the combined loads should be applied in the design of each individual line. This can be used both when constructing new power lines as well as when reconductoring and voltage upgrading existing lines.
Contact persons regarding power lines at Kjeller Vindteknikk are: