摘要
覆冰导线脱冰会引起导线的剧烈运动,使导线跳跃上下摆动,对输电线路造成危害很大的机械和电气事故。建立了3自由度多档导线模型分析特高压输电线路脱冰跳跃问题,研究了覆冰厚度、脱冰量、档距大小、耐张段中档数、导线悬挂点高差、不均匀脱冰等因素对导线脱冰跳跃的影响,对特高压输电线路导线排列、铁塔选型、档距配置的设计有一定的参考价值。通过大量的计算,静态纵向不平衡张力换算为动态纵向不平衡张力的冲击因数可取为1.8,留有了一定的裕度,能够满足工程实际的需要。
Ice-shedding can cause violent oscillation of the lines,and make the conductors jump up and down.The dynamic effect of ice-shedding on transmission lines implies two categories of electrical and mechanical concerns.A 3-DOF（degree of freedom） dynamic model for multi-span lines was developed to calculate dynamic effects of ice-shedding on ultra high voltage（UHV） overhead transmission lines.The influencing factors were studied including the ice thickness,percentage of ice-shedding,span length,number of spans per line section,different elevation between suspension points,and nonuniform mode ice-shedding.Consideration of the ice-shedding problems is very important in determining the alignment of the conductors,the type of towers and the configurations of spans in UHV overhead transmission lines.The impact factor of static longitudinal imbalance tension changing to dynamic longitudinal imbalance tension can be confirmed as 1.8 through the massive computations,which meets the demand of projects.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第10期1631-1636,共6页
Journal of Tsinghua University(Science and Technology)
基金
国家电网公司关键技术研究资助项目
关键词
特高压
架空输电线路
脱冰跳跃
数值计算
纵向不平衡张力
ultra high voltage（UHV）
overhead transmission line
ice-shedding
numerical computation
longitudinal imbalance tension
