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Dynamic characteristic of ice-shedding on UHV overhead transmission lines.pdf

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Dynamic characteristic of ice-shedding on UHV overhead transmission lines

Cold Regions Science and Technology 66 (2011) 44–52 Contents lists available at ScienceDirect Cold Regions Science and Technology j ourna l homepage: www.e lsev ie / locate /co ld reg ionsDynamic characteristic of ice-shedding on UHV overhead transmission lines Xiaobo Meng a, Liming Wang a,?, Lei Hou b, Guanjun Fu a, Baoqiang Sun a, Mark MacAlpine a, Wei Hu c, Yong Chen c a Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong Province, China b State Grid Corporation of China, AC Project Construction Branch, Beijing 100140, China c State Grid Electric Power Research Institute, Wuhan 430074, Hubei Province, China? Corresponding author. E-mail addresses: mengxiaobo2008@ (X. Men (L. Wang). 0165-232X/$ – see front matter ? 2011 Elsevier B.V. A doi:10.1016/j.coldregions.2011.01.005a b s t r a c ta r t i c l e i n f oArticle history: Received 18 August 2010 Accepted 13 January 2011 Keywords: Simulation test UHV Overhead transmission line Ice shedding Multi-span configurations Numerical computationThe dynamic effect of ice-shedding can cause mechanical damage and electrical faults due to the clashing of conductors. The ice-shedding problem ismore serious on UHV lines as the quantity of bundled conductors and the cross-sectional areas of the conductors are larger. Consideration of the ice-shedding problems is very important in determining the alignment of the conductors, the type of towers and the configurations of spans. In this paper, the actual dynamic responses of the conductor displacement and tension are acquired through physical testing, in which the natural ice formed on conductors is simulated by lumped loads hanging on the conductors, using full-size multi-span configurations. Various ice- shedding modes are considered. Furthermore, a multiple degrees of freedom dynamic model of the multi-span lines, suitable for analyzing ice-shedding, has been developed and gives good agreement between the computation and test results, which demonstrates t