Preliminary Discussion on Wind Loads and Accreted Ice Loads of Transmission Lines for Developing Wind Power in the Arctic Regions

doi:10.11930/j.issn.1004-9649.2017.06.049.07

Abstract

Abstract: Based on the temperature data from ten International Exchange Stations and the varying trend of the boundary layer height determined by metrological model analysis, the reference wind pressure and the exposure factor in the Arctic regions were compared with those in mid-low latitude regions. The air density at -70 ℃ temperature is higher than the value at -10 ℃ temperature by 29.7%. At the average temperature in 20 years in a typical Arctic region(Karskoe More areas), the reference wind pressure is higher than the value at standard atmosphere pressure by 7.3% to 8.7%. The boundary layer height in the Arctic regions is higher than that in the mid-low latitude regions, which can induce the decrement of the exposure factor of wind pressure. If the effect of the boundary layer height is ignored, the exposure factor for wind pressure calculation is on the safety side. The typical load types of transmission lines in accreted ice areas of the Arctic areas were proposed. The static and dynamic analysis models for calculating ice loads of transmission lines in the Arctic regions were established. According to the climate feature of strong wind accompanying with extreme low temperature, the probabilistic combination method of wind load and accreted ice load based on IEC standard was suggested.

Key words: transmission lines, low temperature, reference wind pressure, exposure factor, accreted ice load, combination of wind load and ice load

CLC Number:

TM753

YANG Fengli, ZHANG Hongjie, LI Zheng, SONG Lili, QUAN Lihong. Preliminary Discussion on Wind Loads and Accreted Ice Loads of Transmission Lines for Developing Wind Power in the Arctic Regions[J]. Electric Power, 2017, 50(6): 49-55.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2017.06.049.07

https://www.electricpower.com.cn/EN/Y2017/V50/I6/49

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