覆冰四分裂导线风洞试验与舞动研究

Study on Wind Tunnel Test and Galloping of Iced Quad Bundle Conductor

输电导线舞动是线路运行中常见的现象,其会导致输电线路发生电气和机械事故,为了降低导线舞动造成的危害,需要对空气动力学参数这一关键因素进行研究。首先利用风洞试验获得了新月形和D形两种典型覆冰导线的气动力参数;然后分析了风速、覆冰厚度、导线型号、分裂间距和分裂数对导线气动力参数的影响;最后针对一条500 kV的分裂导线,利用风洞试验所获得的参数对其临界起舞风速和舞动情况进行计算和仿真。试验结果表明:仿真计算得到的结果与实际情况一致;导线气动力系数随着风速的增加呈现先增加后减小的趋势;随着覆冰厚度的增加,新月形覆冰导线在20°攻角附近出现尖峰,D形导线的升力系数在100°～170°攻角呈现明显上升的趋势;导线型号、分裂间距和分裂数均对空气动力学参数有重要的影响。本文的研究结果对实际工程中覆冰四分裂导线在不同气象条件下的舞动幅值预测及防舞技术的应用具有指导作用。

Conductor galloping is a common phenomenon in transmission line operation,which can lead to electrical and mechanical accidents.In order to reduce the harm caused by conductor galloping,it is necessary to study the key factor of aerodynamic parameters.Firstly,the aerodynamic parameters of crescent and D-shaped typical iced conductors were obtained by wind tunnel test.Then,the effects of wind speed,ice thickness,conductor type,bundle spacing and splitting number on wire aerodynamic coefficients were analyzed.Finally,the critical galloping wind speed and galloping situation of a 500 kV four-bundle conductor were calculated and simulated using the parameters obtained from the wind tunnel test.The experimental results show that the simulation results are in good agreement with the actual situation.The aerodynamic coefficients of conductors increase first and then decrease with the increase of wind speed.With the increase of icing thickness,peaks on crescent-shaped iced conductors appear near the angle of attack at 20 degrees,and the lift coefficients of D-shaped conductors show an obvious upward trend at 100~170 degrees.Besides,the conductor type,bundle spacing,and splitting number have important effects on aerodynamic parameters.The results are of guiding significance to the prediction of galloping amplitude and the application of anti-galloping technology of ice-covered quad bundle condutor under different meteorological conditions in practical engineering.