A FEA model of seven continuous span conductors and insulators for UHV transmission line in heavy icing area was established for the ice-shedding analysis. Some parameters were considered in the ice-shedding simulating analysis, which include the damping ratio, the ice-shedding modes and the ice thickness. The dynamic responses of jumping heights, unbalanced tension and vertical load at the end of the insulator were obtained. Effects of different parameters on the dynamic responses were studied. The values of unbalanced tensions and vertical loads were determined for the UHV suspension tower in heavy icing area. For the case of ice shedding in one span conductor and the damping ratio is 5%, the percent of unbalanced tension to the maximum working tension is lower than the values regulated in the design regulations. The dynamic magnification factors of the vertical load are from 1.28 to 1.40. For the suspension tower in 20mm and 30mm icing area, the percent of the up-pull load to the maximum working tension is proposed to 10 percentages. For the suspension tower in 40mm and 50mm icing area, the percent of the up-pull load to the maximum working tension is proposed to 5 percentages.
YANG Feng-li;YANG Jing-bo.
Analysis on the Loads from Ice Shedding Conductors in Heavy Icing Areas [J]. Journal of Vibration and Shock, 2013, 32(5): 10-15
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