输电线路脱冰跳跃幅值影响因素分析

导线覆冰脱落会引起导线剧烈跳跃摆动，导致输电线路产生严重的机械、电气事故．为明确输电线路脱冰跳跃幅值特性，揭示各项参数及其交互作用对冰跳幅值的影响规律，采用数值模拟方法，建立导线一绝缘子串耦合模型，对冰跳幅值在不同影响因子作用下的变化特性进行研究．结果表明，导线跳跃幅值随着覆冰厚度、脱冰量、导线刚度的增加而增加，其增大的幅度不断上升；冰跳幅值随着连续档数的增加而趋于稳定；悬挂点高差、绝缘子串长度等因素对跳跃幅值影响较小；不同脱冰方式导线跳跃幅值相差较大；风荷载对导线横向摆动影响较大，对竖向跳跃影响较小；交互作用分析过程中，脱冰量对冰跳幅值影响最大，脱冰方式与脱冰量之间的交互作用对幅值影响最小．相关成果为覆冰线路设计及后续覆冰脱落分析研究提供参考借鉴．

Simulation research on the amplitude factors of ice shedding of transmission line

Ice-shedding can cause violent oscillation of the lines,and make the conductors jump up and down.Wire-insulator string coupling model was established based on finite element software,and numerical simulation method was used to get the amplitude characteristics of ice-shedding on transmission lines,and revealing the influence of various parameters on the amplitude of ice-shedding.The results shows that：The amplitude of ice-shedding increases faster and faster with the ice thickness,percentage of ice-shedding and conductor stiffness increasing;the number of spans per line section within a certain range of the amplitude of ice-shedding is larger,the impact tends to be stable when the number more than a certain file;these factors of the elevation between suspension points and insulator have a little effect on amplitude of ice-shedding;with different type of ice-sheding the amplitude of ice-shedding has a great change;the wind load has a great impacts on the horizontal displacement of transmission line.Percentage of ice-shedding on the jump amplitude has maximum effect,the interaction between percentage of ice-shedding and type of ice-sheding has minimal impact to the amplitude.It provides a reference for subsequent ice-shedding analysis,and makes a certain guiding role in formulating the scientific and reasonable ice melting and deicing method at the post-icing.