| Transmission Line as a lifeline project of the country,need long-term exposure to the wild suffered severe environmental loads,the inevitable loss of the wire,fittings,etc.will occur,even disconnection lines,which may cause the whole line power interruption.In other countries,the transmission line break accident research carried out earlier,many research results have been used to guide the construction of transmission lines.In China,research on transmission line break started late,but with the development of the domestic power system,UHV transmission lines and Big Span transmission line began to spread,broken collapse accident occurred.Especially,in 2008,the South snowstorms occur in many regions,which caused a large number of broken collapse accident,the study of the transmission line break began to be taken seriously.However,due to study engineering background and conditions,research is not comprehensive enough,few scholars specializing in disconnection and contact problems of transmission line that have a angle.In this paper,select corner transmission tower,which in a mountainous,as the research object,using the finite element method to establish accurate models to study the effects of the corner tower transmission line break,and comparative study the dynamic response of transmission tower when there is a ground or there is not a ground respectively.First,select the actual project as a background,using the finite element method establish a sophisticated transmission towers and lines system model.Consider the effect of coupling between transmission lines and transmission towers,with "a tower two lines" tower-lines system model as an example,comparative study the tower-line coupled system influence on the dynamic characteristics of the transmission tower.Secondly,combined the mountainous terrain area where transmission line is as a reference,using the function simulation method to establish a sophisticated mountainous terrain models.Study the contact problems with the ground during free fall of the broken lines.combined with the actual transmission line disconnection case presented many situations of transmission lines disconnected.From thedifferent broken numbers and broken position,analyze the dynamic response of power transmission tower in different disconnection conditions.Select the axis stress and impact stress of tower legs for inspection object to study the trends of Dynamic Response of Transmission Tower in different break conditions.Again,Study the dynamic response of transmission tower without ground under different break root number.Select dynamic response of transmission tower with ground as a reference,to study the different dynamic response of the situation on the ground and without the ground.Finally,using viscous dampers as a tool to study the vibration control of the transmission line system.With wind-induced vibration response of transmission towers and lines as background,design 5 different arrangements of the dampers,calculated the control results of each arrangement,compared to obtain the optimal layout scheme.According to the optimal damper arrangement plan,has studied the vibration control of fatigue breakage and wind-induced breakage. |
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