Research On Tension-side Conductor Stringing Technology For Small Span Turning

In recent decades,conductor’s tension stringing technology has been developed from manual stringing to mechanized construction,and has gradually becoming the most important part in the process of overhead power transmission line construction.As one of special methods in tension stringing,the tension-side conductor stringing technology needs to be further studied on relevant theories such as the layout of turning field,the dynamic process of leading and turning,and the adjustment of spatial attitudes of walking board and blocks.In this paper,the one-pull-four and small-span tension stringing is studied,based on the Ya’an II～ Ziyang 500 kV power transmission project and the experiment platform for the off-ground turning of tension-side conductors at Huatou village,Meishan city.The main work of this paper is as follows:1.This paper reviews and summarizes the previous domestic and foreign literature in tension stringing technology and the field of dynamic simulation of conductor,and conducts on-the-spot investigations on the large-angle turning of conductor.2.Aiming at the lack of technical specification and guidance in the traditional conductor turning technology,the plane geometry positions of the joint-working blocks are analyzed,and the positional relationships between blocks under different turning angles are obtained.Meanwhile,the multi-block lightweight turning device is designed in this paper,and the layout process of the new-type turning device with multiple blocks is established.3.On the basis of simulation models of traditional one-pull-two tension stringing,the tools in tension stringing are simplified,and the numerical simulation model of the one-pullfour and small-span tension stringing is established.After verifying the model’s reliability,the change of axial tension between conductors and traction rope is analyzed by the postprocessing module of ADAMS,and a theory is proposed that the expansion coefficient and amplification coefficient of axial tension of the conductor are used as the reference basis to avoid the emergence of potential danger points.Furthermore,the reasons that influence the expansion attitudes of walking board are studied,and the numerical relationship between the tension produced by the tension machine is obtained,which makes the attitudes more ideal.4.In order to get rid of adjusting the attitude of walking board and blocks by the experience of operators,the relationship between the tension produced by the tension machine and the attitude of walking board is established.Through ADAMS virtual prototype simulation,a large-angle adjustment method which is applicable to the reverse attitude of walking board is proposed,i.e.the adjustment strategy to change the reverse attitude of walking board by changing the value of tension produced by the tension machine.And a PLC-based device for block attitude adjustment is designed to meet the demand of small-angle adjustment of spatial attitudes of blocks.Finally,the theory proposed in this paper is verified by experiments,which has certain guiding significance on making the walking board pass the blocks successfully.