输电线路运维过程中观测到翻转现象，严重影响线路运行安全。本文依据架空导线悬链线模型，得出导线的沿线应力。将分裂导线翻转后的绞合区间简化为圆柱螺旋线，建立了分裂导线的翻转几何与力学模型，推导了分裂导线翻转后子导线长度和张力，给出了分裂导线翻转自恢复力矩的简化理论计算公式。基于有限元方法对案例线路进行翻转过程的准静态模拟，将有限元分析结果和理论计算得到的分裂导线翻转自恢复力矩进行对比分析，最大相对误差为8.44%，表明翻转自恢复力矩简化理论计算公式具有一定的准确性。进一步利用简化计算公式研究了分裂数、绞合角度、次档距、分裂间距、绞合位置等线路本体参数对分裂导线翻转自恢复能力的影响。结果表明：输电线路分裂数越多、绞合角度越大、次档距越小、分裂间距越大、绞合位置越靠近翻转间隔棒时，线路翻转自恢复能力越强，线路发生翻转失效概率越低。该简化计算公式为输电线路设计提供了理论依据和参考。
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.
关键词
分裂导线 /
翻转 /
自恢复力矩 /
有限元分析
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Key words
bundle conductor /
turnover /
self-recovery moment /
finite element analysis
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