Citation

Hou L, Wang LM, Zhu PX, Guan ZC. Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2008; 28(6): 1-6.

Copyright

(Copyright © 2008, Shui li dian li chu ban she)

DOI

unavailable

PMID

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Abstract

Ice-shedding from conductors is a familiar phenomenon on overhead transmission line in ice area. Ice-shedding will cause the violent oscillation of the lines, and makes the conductors jumping up and down. The jumping of the conductors reduces the phase-to-phase clearance, even leads to interphase flashover. The Ice-shedding also applies a large dynamic load to the insulator strings, fittings and towers, and brings destructive impact on them. In heavy icing areas and long-span cases, the effects of ice-shedding are especially significant. In UHV lines, because the number of bundled conductors and the section area of conductor are bigger, the ice-shedding problem is more serious. The 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 non-linear dynamic process of ice-shedding is analyzed first. Then a 3 degree of freedom (DOF) dynamic model of multi-span line suitable for analyzing ice-shedding is presented. Explicit central difference integral is adopted as the computation method. The time responses of the ice-shedding are acquired. The influencing factors including percentage of ice-shedding, multi-span configuration, mechanical parameters of conductor, uniform and nonuniform mode ice-shedding are studied.