Study on Equivalent Bending Stiffness of 1250mm2 Large Section Conductor

Current calculation method of tension stringing construction does not include the influence of bending stiffness of conductor. There are relative errors between the calculated results and the measured results of a series of important parameters, such as conductor wiring length, maximum pull tension, sag between the various sections, which have adverse effects on construction safety. Aiming at 8×JL1/G2A-1250/100 conductor in UHV engineering, the simulation model was established by the finite element software for the equivalent bending stiffness of the large section conductor. The coupled displacement constraints were applied to the whole section of the two ends of conductor. Changing the vertical displacement of one end section, the conductors with different lengths were simulated by the explicit kinetic method considered the contact friction between wire strands. Combined with the mechanical cantilever beam model, the equivalent bending stiffness of the conductor under different working conditions was obtained. By analyzing the curves of the equivalent bending stiffness of the conductor, the equivalent bending stiffness of the long conductor suitable for engineering calculation is obtained. The research result provides key parameter for the accurate tension control in tension stringing construction of UHV project.