输电线脱冰过程中耐张串金具的受力仿真分析

Simulation analysis of stress in power fitting for strain insulator-string following ice shedding from cables

针对脱冰过程中导线张力对输电线连接金具的破坏作用,运用ABAQUS软件分别建立特高压输电线路的导线模型和耐张串连接金具的整体模型。然后基于改变密度法模拟均匀覆冰的六分裂导线和覆冰脱落过程,研究不同步脱冰时各子导线的动态张力和导线束扭转角的变化规律,结果表明未脱冰子导线的动态最大张力大于导线覆冰静态张力,导线动张力与导线束的转角大体呈负相关关系。最后选取导线覆冰静态张力和脱冰引起的导线最大动张力、最小动张力、稳态张力分别施加到耐张串金具模型上进行有限元分析,发现耐张串各连接金具的应力与导线张力的相关关系不一致;对应力较大和存在形状突变的金具进行单独分析,判断其相应的破坏模式,为线路金具设计及优化提供了参考。

In order to address the damaging impact on the electric power fittings of the tension change of conductors due to ice shedding from cables,the wire model of UHV transmission line and the integral model of strain insulator-string were established respectively using the ABAQUS software.Based on the method of changing density,the ice shedding from six-bundle conductors with uniform ice-coating was simulated.Under non-synchronous ice shedding conditions,research was undertaken into the dynamic tension of sub-conductors and the torsion angle of the six-bundle conductor.The results show that the maximum dynamic tension of sub-conductors without ice shedding is larger than that of the static tension of iced conductors,and that the dynamic tension of the conductor is negatively correlated with the torsion angle of the conductor bundle.Finally,the finite element analysis was conducted based on the effect of static tension of iced conductor,and the maximum dynamic tension,the minimum dynamic tension,and the steady tension of conductors caused by iced shedding on the stress of strain insulator-string.The result reveals that the changing relationship between the stress of each electric power fitting of strain insulator-string and the tension of sub-conductors is inconsistent.The failure of the electric power fittings with greater stress and the sudden shape change were analyzed separately.The research results can inform the design and optimization of electric power fittings.