Galloping Of Iced Transmission Line In Turbulence Flow

Along with the development of the economic power energy has been widely used,Ultra-high voltage, the construction of the transmission lines more and more common.After winter conductor ice coating, under wind load will occur at low frequency, largeamplitude of self-excited vibration, which is dancing. Because the conductor waveamplitude is larger, so will cause the line in a variety of damage. For people in a largenumber of experimental and theoretical research. Commonly Uniform wind loadanalysis of conductor, more commonly used numerical analysis model for a cableelement model, and split conductor equivalent to single conductor model.This paperadopt the numerical simulation method to calculate the turbulent wind field under acable element model and beam element model law of motion. Based on curved beamtheory beam element model consider tensile stiffness,bending stiffness and torsionalstiffness.Article use the finite element method analysis split conductor movement inturbulent wind. Main research contents are as follows:(1) The numerical of turbulent wind field. Based on davenport spectrum,the Windvelocity history synthesis by the harmoric synthesis method,consider spatialcorrelation.According to the lead node number of the finite element of translationline,synthesis of corresponding nodes location of wind velocity history.(2)The comparative uniform wind field and turbulent wind dancing on singleconductor model influent. The establishment of curved beam and cable element modelfor the analysis of different iced thickness of single conductor in uniform wind andfluctuating wind of the galloping amplitude changes. Combined with wind tunnel test,the aerodynamic parameters determination of14mm iced single conductor,analysis theimpact of dynamic parameters of gas turbulence on displacement vibration amplitude ofthe two models of conductor.Use the Taylor formula conductor three coefficients.(3)The turbulence effects on split conductor.Use finite element model to Establishsplit conductor model: The traditional equivalent single conductor cable elementmodel;The traditional equivalent single conductor beam element model;The precisemodel of bundled conductor model,a node is half hinged between four conductorspacer bar and wire,two adjacent node are half hinged between four conductor spacerbar and wire,relative two nodes are half hinged between four conductor spacer bar andwire,all nodes are half hinged between four conductor spacer bar and wire,all nodes are rigid between four conductor spacer bar and wire;node constraint and torsional couplingmodel.Analysis Dancing displacement of all models,under turbulent wind,displacementchanges with the increase of span and400m span dancing under the wind speed.(4) The turbulence parameters effect on the conductor is dancing.Under the windattack angle of400and1800，the beam elment and cable element of single havedifferent wind speed and wind speed stop dancing daning. Turbulence intensity andcorrelation coefficient affect dancing displacement and the speed of dancing. Thedifferent models of split conductor has different starting dancing wind speed.