特高压大跨越输电线路防振设计系统的研究

特高压输电线路大跨越档距大、挂点高,导线微风振动水平显著,防振设计难度大。目前,大跨越导线的防振方案设计基本依赖于实验室微风振动模拟试验来完成,该试验流程复杂,且必须安装真型导线及金具,因此试验周期有时长达数月。基于有限元方法和能量平衡原理,开发了特高压输电线路大跨越防振设计系统,具备分裂导线微风振动模态分析、谱分析和瞬态分析功能,能够针对初步设计方案计算出分裂导线各关键点处的动弯应变值,并对多个方案进行对比分析,推选出较优的防振方案进行试验验证,从而减少特高压输电线路大跨越防振试验次数,提高防振方案设计效率,更好地满足特高压工程进度要求。

Research on Anti-Vibration Design System for UHV Large Crossing Transmission Line

It is difficult for UHV large crossing conductors to resist aeolian vibration due to larger span and higher hanging point. At present, laboratory aeolian vibration simulation test is the only effective means to design anti-vibration schemes for UHV large crossing conductors. However, the test process is complicated, and real type conductors and hardwares must be used. An UHV large crossing anti-vibration design system is developed based on finite element method and energy balance principle. Modal analysis, spectrum analysis and transient analysis functions for bundled conductors aeolian vibration are provided, and the dynamic bending strain values at key points of bundled conductors are calculated. Optimized anti-vibration scheme can be recommended to aeolian vibration simulation test by comparison and analysis of several predesigned schemes. Simulation test period can be reduced and anti-vibration design efficiency can be improved with proposed method, which can better meet requirements of UHV power transmission project.