Wind Vibration Response And Fatigue Analysis Of Insulator On Transmission Line

High voltage transmission line system, usually made up of steel-cored aluminum (ground) strand, insulator and armour clamp, is mainly used in high voltage, ultrahigh voltage transmission overhead structure system. High voltage transmission line is an important component of the power grid and plays an important role in china's development. Taking insulator hardware of long span transmission line system in Nanjing Sanjiangkou as a research object, combined with the research status, FEM is used in structure response analysis and fatigue analysis under nature vibration property, wind vibration response and static wind load situation. The fatigue life with wind vibration load is estimated efficiently.Firstly, FEM model of insulator hardware is created. Nature vibration analysis is taken.Secondly, with the meteorological data in Sanjiangkou, time curve of fluctuating wind velocity is obtained. Then wind load time curve is obtained according to the standard. Step-by-step integration method is used in wind vibration analysis, preparing for the wind vibration fatigue analysis.Thirdly, mechanism of fatigue destroy is explained. Insulator hardware model is created with FEM. With static analysis, node location where maximum strain appears is obtained. Miner fatigue damage cumulative theory is used to figure out the coefficient of fatigue damage of insulator hardware.Finally, according to time curve of strain, fatigue cyclic number is counted with rain flow counting method. Wind vibration analysis is taken after the fatigue life obtained by Miner fatigue damage cumulative theory.