Overturningself-recovery characteristics of bundle conductor in transmission lines
LIU Zhuli1, HU Juntao1, WU Chuan2, ZHANG Bo2, DENG Li1
1.School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China;
2.Electric Power Research Institute State, Grid Henan Electric Power Company, Zhengzhou 450052, China
Abstract:Turnover phenomenon is observed on transmission lines, which seriously affected the safety of line operation. Based on the catenary model of overhead conductor, the stress along the conductor is obtained. The twisted section of the bundle conductor is simplified as a cylindrical spiral, the turnover geometric and mechanical model of the bundle conductor is established, the length and tension of the sub conductor after the bundle conductor is turned over are derived, the simplified theoretical calculation formula of the turnover self-recovery moment of the bundle conductor is given. Based on the finite element method, the quasi-static simulation of the case line turnover process is carried out, and the finite element analysis results are compared with the theoretical calculation of the turnover self-recovery moment of the bundle conductor. The maximum relative error is 8.44%, which indicates that the simplified theoretical calculation formula of the turnover self-recovery moment was correct. Based on the simplified calculation formula, the influence of split number, twisting angle, sub-span, split spacing, twisting position and other line parameters on the turnover self-recovery ability of the bundle conductor is further studied. The results show that the more the number of splits, the greater the twisting angle, the smaller the sub-span, the greater the split spacing, and the closer the twisting position is to the turnover spacer, the greater the line turnover self-recovery moment, the stronger the turnover self-recovery ability of the line and the lower the probability of line turnover. The simplified calculation formula provides theoretical basis and reference for transmission line design.
刘竹丽1,胡俊涛1,伍川2,张博2,邓力1. 输电线路分裂导线翻转自恢复特性研究[J]. 振动与冲击, 2023, 42(21): 284-290.
LIU Zhuli1, HU Juntao1, WU Chuan2, ZHANG Bo2, DENG Li1. Overturningself-recovery characteristics of bundle conductor in transmission lines. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(21): 284-290.
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