输电线路动态风偏响应特性及频域计算方法

发布时间：2019-06-22 16:26

【摘要】：以多跨输电导线在自重和平均风荷载共同作用下的静力平衡构型和刚度作为计算初始条件,假定在此基础上受脉动风荷载作用的响应属于小变形,采用美国土木工程师学会(ASCE)推荐方法考虑导线气动阻尼,提出了输电线路动态风偏响应频域计算方法,深入分析了振型组合阶数及组合方式对计算结果的影响,并与时域计算结果进行了对比。对比结果表明:导线动态风偏计算中必须考虑多阶振型的贡献,且各振型间的交叉项不可忽略;对于2跨输电导线,考虑前3阶振型的完全二次方结合(CQC)法能满足精度要求;对于5跨输电导线,需要考虑前9阶振型CQC组合。计算结果表明:悬垂绝缘子串风偏峰值脉动响应可达到平均响应的10%以上。因此当前输电线路设计中不考虑风偏脉动值是偏不安全的,是引起大风下风偏闪络的主要原因之一。
[Abstract]:Taking the static equilibrium configuration and stiffness of multi-span transmission conductors under the combined action of self-weight and average wind load as the initial conditions for calculation, it is assumed that the response subjected to fluctuating wind loads belongs to small deformation. The (ASCE) recommended method of the American Institute of Civil Engineers is used to consider the pneumatic damping of conductors, and a frequency domain calculation method of dynamic wind deviation response of transmission lines is proposed. The influence of mode combination order and combination mode on the calculation results is analyzed in detail, and the results are compared with those in time domain. The comparison results show that the contribution of multi-order vibration modes must be considered in the calculation of dynamic wind deviation of conductors, and the cross terms between each mode can not be ignored; for 2-span transmission conductors, the complete quadratic power combined with (CQC) method considering the first third vibration modes can meet the accuracy requirements; for 5-span transmission conductors, the first nine vibration modes CQC combination should be considered. The results show that the peak fluctuating response of drape insulator can reach more than 10% of the average response. Therefore, it is unsafe not to consider the wind bias pulse value in the current transmission line design, which is one of the main reasons for the wind bias flashover under the strong wind.
【作者单位】：浙江大学结构工程研究所;国网河南省电力公司电力科学研究院输电线路舞动防治技术重点实验室;
【基金】：国家自然科学基金(51378468;51178424) 国家电网公司科技项目(52170215000C)~~
【分类号】：TM75

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