摘要
突然断线使处于绷紧状态的输电线张力迅速释放,塔线体系将受到动力冲击作用,但设计规范仅按静态荷载来考虑断线荷载。以某输电线路为例,采用有限元方法建立塔线体系模型,进行断一根至六根子导线工况的模拟,并考虑跌落导线与地面的碰撞。分析发现,断子导线的根数越多,或者越接近断线点,直线塔绝缘子的摆动幅度越大,峰值轴力也越大。导线断线将产生两个极大的冲击作用,一个是导线断裂产生的冲击,另一个是跌落导线与地面碰撞产生的冲击。
The sudden breakage of conductor enables the quick release of tension in conductor,which causes the dynamic impact effect on transmission line system.However,the design codes of transmission towers usually consider conductor breakage load as static load.Taking a transmission line system as example,finite element method was employed to construct the tower-line model.In calculation,the cases of one sub-conductor breakage to six sub-conductors breakage were simulated and the impinging of dropping conductors against ground was considered.The conclusions show that the bigger the number of broken sub-conductors is or the closer the broken point is to the insulator,the larger the swing amplitudes and the peak axial forces on insulators of tangent towers will be.The breakage of conductors will result in two major impacts: the one is induced directly by the sudden breakage of conductors and the other is induced by impinging of dropping conductors against ground.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第12期4-8,共5页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(50638010)
浙江省自然基金资助项目(Y1080207)
关键词
输电塔
绝缘子
有限元
断线荷载
冲击作用
transmission line
insulator
finite element method
conductor breakage load
impact effect
