Modeling And Simulation Of Transmission Conductor For Breeze Vibration And Anti-vibration

With the implementation of the West-East Power Transmission Strategy,transmission lines have been constructed widely.However,the safe operation of the lines is constantly tested by gale weather conditions.And the breeze vibration is a hot potato of them.Breeze vibration has the characteristics of high frequency and low amplitude,which often leads to fatigue strand breakage of transmission wires,and even disconnection of wires,which will cause vicious accidents.Therefore,the method of suppressing the wind vibration of the wire and ensuring the stable operation of the line is the hot direction of the current power transmission,and this paper studies the setting of the typical anti-vibration device,models and simulates the inhibition effect of the anti-vibration device on the breeze vibration.The main work of the thesis is as follows:1.Modeling analysis and model optimization were carried out for a typical anti-vibration device-anti-vibration hammer.By solving the differential equation for the anti-vibration hammer,the vibration mode and natural frequency of the hammer are obtained.It is modeled according to the finite element method and calculated by modal analysis to calculate its inherent frequency and vibration mode.And through the comparison of the calculated values of the two models,the reliability of finite element model of the anti-vibration hammer is proved.Model optimization is carried out with the goal of the natural frequency of the anti-vibration hammer.Simulation results show that the optimization results of the anti-vibration hammer meet the target requirements,which can improve its anti-vibration effect.2.For the engineering examples in Inner Mongolia,the breeze vibration analysis of transmission wires is carried out.And the amplitude and dynamic bending strain of the conductor are used as the measurement criteria for the vibration prevention analysis of breeze vibration.In the absence of vibration prevention facilities,it is found that only the self-damping of the wires is difficult to offset the wind energy input,so it is necessary to install anti-vibration devices.After the anti-vibration hammer is installed,it is found that the number of anti-vibration hammers is not proportional to the anti-vibration effect,and the closer the installation position,the better the effect of the wave belly.Compared with the anti-vibration hammer,after adding the damping wire,the damping line can be seen that has a wider anti-vibration frequency range and can achieve a larger frequency range of breeze vibration suppression.Finally,the two anti-vibrations are combined,which can combine the advantages of both and have a good anti-vibration effect.3.The transmission conductor breeze vibration platform is programmed to be built,combining the transmission wire breeze vibration theory with engineering examples.Based on simulation analysis,the project instance rehearsal is realized on the platform,and then the basis for the advantages and disadvantages of the anti-vibration scheme are provided,which helps the installation and commissioning in the actual project.