Design and Test of Strain Tower for 500 kV Double-Circuit Power Transmission Line in Heavy Icing Area

doi:10.3969/j.issn.1000－7229.2013.08. 011

Abstract

Abstract: The design of double-circuit power transmission line is an important solution for the problem that the power transmission corridors are becoming increasingly scarce in the heavy icing area. But due to the complexity of ice-covering and ice-dropping of conductor and ground wire in double-circuit transmission lines， the relative research is quite deficient at home and abroad. Taking SJB4261 strain tower of double-circuit transmission line which was firstly adopted in a 500 kV transmission project in heavy icing area as an example， the tower type selection for double-circuit transmission line was analyzed in heavy icing area. Deformation and stress rules of tower were comprehensively analyzed based on tower's full-scale tests and lots of finite element numerical calculations. The calculation results show that all the displacements of tower in numerical analysis are smaller than those in actual measurements due to the influence of bolt slip effect， and beam-bar unit model is able to better reflect the stress rule of main materials. The full-scale tests of tower are successfully completed under predetermined condition， which demonstrates that the strain tower of double-circuit transmission line is feasible in heavy icing area.

Key words: strain tower, heavy icing area, double-circuit power transmission line, test, finite element

HAN Dagang， LIU Hongchang， FENG Yong， LI Meifeng， XIAO Bing， XIAO Hongwei， YANG Yang. Design and Test of Strain Tower for 500 kV Double-Circuit Power Transmission Line in Heavy Icing Area[J]. ELECTRIC POWER CONSTRUCTION, 2013, 34(8): 56-63.

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