Analyzing Loads from Ice Shedding Conductors for UHV Transmission Towers in Heavy Icing Areas
Publication: Journal of Cold Regions Engineering
Volume 28, Issue 3
Abstract
In this paper, a finite element analysis (FEA) model of seven span continuous conductors and insulators for an ultra high voltage (UHV) transmission line in a heavy icing area was established for ice shedding analysis. The parameters considered in the ice shedding simulation analysis include damping ratio, ice shedding ratio, ice shedding modes, and ice thickness. The dynamic responses including jumping heights, unbalanced tensions, and vertical loads at the end of the insulator were obtained. The effects of each of the parameters on the dynamic responses were discussed. The design values for unbalanced tensions and vertical loads were proposed for the UHV suspension tower in a heavy icing area based on the analyses results. The dynamic magnification factors of the vertical load should be between 1.06 and 1.11. For the suspension tower in 20 and 30 mm icing areas, the uplift load percentage is proposed to be 10%. For the suspension towers in 40 and 50 mm icing areas, the uplift load percentage is proposed to be 5%.
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Acknowledgments
This work has been funded by the State Grid Corporation of China, and the financial aid number is GC71-10-007. The authors would like to thank the sponsor State Grid Corporation of China.
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© 2014 American Society of Civil Engineers.
History
Received: May 10, 2012
Accepted: Feb 20, 2014
Published online: Apr 28, 2014
Published in print: Sep 1, 2014
Discussion open until: Sep 28, 2014
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