Wind-induced Vibration Response Simulation Of 220kV Overhead Transmission Lines Under Subtropical Monsoon Climate

Wind-induced vibration of transmission lines is an important factor causing the harm of transmission lines.The wind load is different under different climates in different regions,and the wind-induced vibration response is also different.In addition,in different working conditions under the same environment,the wind-induced vibration response of the wires is also different,resulting in different hazards.Therefore,the vibration response analysis of wires under different working conditions in specific climates has practical engineering research value.The wind-induced vibration of transmission lines in various working conditions under specific climate conditions has been studied.The main research contents are as follows:Firstly,the finite element model of the transmission line was established with the Wuyi zheye1 line in Jiujiang.The finite element software was used to find the initial shape of the transmission line and the uniform shape was derived.The calculation formula of the catenary equation of the transmission line is verified by the calculation of the finite element static analysis method,and the model foundation is established for the subsequent simulation of the wind-induced vibration response of the transmission line.Secondly,based on the local wind speed statistics of the 30 high places in the Wuning area of Jiujiang,based on the AR model in the stochastic process theory,the wind speed model for the area was established.The wind load formula of the transmission line under different working conditions suitable for the research object is obtained by calculation,and the wind load time history diagram is obtained.According to the actual meteorological environment,the function of wind load with time is obtained by Fourier fitting method under various working conditions.It is found that the wind load is larger with the increase of ice thickness.This provides a mathematical model for the subsequent wind-induced vibration response simulation of different wind loads under different working conditions.Next,the wind-induced vibration of the transmission line under various working conditions is simulated.The vibration of the bare wire in the time domain and the frequency domain is analyzed.Comparing the vibrating difference of z-direction displacement,velocity and acceleration and y-direction displacement of key points under the conditions affected by wind load attenuated vibration and not.It is found that the natural frequency of the wire is related to its first-order natural frequency.It is found that increase the span and the thickness of ice coating will strengthen the natural vibration and extend the attenuation period.However,as the thickness of the ice increases,the z-direction vibration under the wind will be weakened.When the wire is de-iced,the most important influence on the vibration of the line is the change of its attribute.Finally,a simulating experiment was conducted on the wind-induced vibration response of transmission lines under various working conditions.A simple platform was built to conduct the wire vibration experiment.The wind-induced vibration experiments were carried out on the transmission lines under various working conditions.The correctness of the simulation results under different working conditions was verified by the experimental data analysis.It was found that the wires mainly vibrate in y direction at natural state.