Study on Dynamic Response and Suppression of UHV Tower Transmission Line Under Wind-Sand Load

During the operation of UHV transmission lines, vibration occurs under the action of wind and sand loads, resulting in stiffness and strength damage of overhead lines, causing strand breakage or even wire breakage accidents, seriously affecting the safe and stable operation of lines. To study the dynamic response of transmission line under wind-sand load and effectively suppress the dynamic response, the mathematical model is established, the scheme of suppressing the dynamic response of transmission line under wind-sand load is designed, and the simulation model under the wind-sand load of the whole transmission line is established. The numerical solution of the dynamic response of the transmission line under wind-sand load and the comparative simulation analysis before and after the implementation of the suppression scheme is carried out, and the dynamic response of the transmission line under wind-sand load is obtained. The results show that by comparing and analyzing the vertical displacement, lateral displacement, and hanging point stress simulation data of transmission lines under wind-sand loads with different sand volume fractions under different wind speeds before and after the optimization of spacer arrangement, it is concluded that the arrangement scheme will reduce the dynamic response of wind-sand loads to transmission lines to varying degrees. Under the same wind speed, the suppression effect is also increasing with the increase of sand volume fraction. The displacement suppression effect on the transmission line is better; the wind-sand load with a wind speed of 30 m/s and a sand phase volume fraction of 10% has the best suppression effect, and the vertical displacement of the conductor is reduced by 27.15%. It is verified that the dynamic response of wind-sand load can be suppressed by optimizing the arrangement position of transmission line spacers.