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Journal of Applied Mathematics
Volume 2014, Article ID 872198, 8 pages
http://dx.doi.org/10.1155/2014/872198
Research Article

Overhead Transmission Lines Deicing under Different Incentive Displacement

1School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
2Division of Electric Power System, China Electric Power Research Institute, Beijing 100192, China

Received 22 January 2014; Revised 9 June 2014; Accepted 27 June 2014; Published 13 August 2014

Academic Editor: Gongnan Xie

Copyright © 2014 Qing He et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Overhead transmission line icing is one of the main factors affecting safety and reliability of power grid. This paper proposed an excitation deicing method of iced wire and theoretically revealed the ice removal mechanism under displacement excitation conditions, by taking the LGJ-70/10 glaze icing wire as the 3D model and analyzing and studying its dynamic response under the effect of displacement excitation. The simulation results show that the stress of wire icing area is enlarged with the increase of excitation displacement and frequency. Through the comparison of the compression strength experimental results on a series of different iced wires in low temperature environment, the authors found out that the stress generated from the wire icing area is greater than the crushing strength of the ice within the scope of the calculation parameters, which proved the validity and the feasibility of the method, and finally the suitable excitation displacement is determined. Following studies show that, as far as possible, it is necessary to reduce the incentive displacement and also to select the appropriate constraint length in order to avoid the line jumping that may be caused by large span ice shedding.