Abstract: 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. 

Key words: ABAQUS, six bundled conductors, non-synchronous ice shedding, strain insulator-string, stress