摘要
采用数值模拟方法来研究500kV超高压输电线路在随机风荷载作用下的风偏问题。具体步骤是:采用考虑随高度变化的Kaimal风速谱和Davenport相干函数,并结合谐波合成法数值模拟线路风场;在ANSYS有限元软件中建立不同档距的输电塔线体系的有限元模型,用ANSYS有限元软件分别对模型进行时程分析,分析结果显示档距对悬垂绝缘子串的风偏角有一定影响;将分析结果同现行设计规程中风偏角计算公式所得结果作比较,提出为精确确定悬垂绝缘子串的风偏角问题,在计算作用于导线和绝缘子串上风荷载时,引入风动态特性的风荷载调整系数,并给出输电线路不同档距时计算悬垂绝缘子串风荷载调整系数的不同取值。
The windage yaw of 500kV wind load is numerically investigated ultra-high voltage （UHV） overhead transmission lines under the action of stochastic The concrete steps are as follows： adopting Kaimal spectrum which reflects the change of wind speed with height above ground, and the Davenport coherence function; time history analysis is performed on the models by using ANSYS finite element model, and the result suggests that the span has certain effect on angle of wind deflection of suspension insulator string. The analysis result is compared with that by design formulas of current design discipline, and it is proposed that wind load adjustment factor with dynamic characteristics should be introduced when wind load on conductor lines and insulator strings are calculated to precisely determine angle of wind deflection of suspension insulator string; Furthermore, different values for calculating wind load adjustment factor of suspension insulator string under the circumstance of different spans of transmission lines are offered.
出处
《广东电力》
2011年第2期1-5,共5页
Guangdong Electric Power
关键词
输电塔线体系
随机风荷载
风偏角
风荷载调整系数
数值模拟
transmission tower-line system
stochastic wind load
angle of wind deflection
wind load adjustment factor
numerical simulation
