输电导线悬挂点处等效风荷载仿真分析

在实际的输电线路中,导线悬挂点处的等效风荷载直接影响着绝缘子串风偏角,其大小与绝缘子串的不同悬挂方式和通过风压不均匀系数折算出的整档导线风荷载有关。为此,首先建立了两档导线有限元模型,仿真分析了绝缘子串的不同悬挂方式对导线悬挂点处的风荷载影响,然后通过在导线上不同位置施加稳态风和选取不同的风压不均匀系数来研究风压不均匀系数折算方法对导线悬挂点处风荷载的影响。研究发现:当稳态风风速为30m/s,且集中作用在导线悬挂点两端附近时,导线悬挂点处的风荷载与设计规范的风荷载差异率达到38.69%,该结果可以部分说明即使导线高度处的实际风速没有超过其设计风速,线路仍有可能会发生风偏跳闸。

Simulation Analysis of the Equivalent Wind Loads on the Transmission Conductor Two Hanging Points

In actual operation of transmission line,the equivalent wind loads on two hanging points of a conductor have a direct impact on the insulator string windage yaw angle,and are related with the different hanging types of insulator strings and the wind load of whole conductor converted by the wind pressure asymmetric coefficient.We established a finite element model of two cross conductors,analyzed the influence of different insulator strings hanging types on the conductor hanging points,and studied the influence of wind load on the two conductor hanging points by flowing steady wind on the different locations of the conductor by choosing the different wind pressure asymmetric coefficient.The conclusion can be drawn that,when the steady wind speed is 30 m/s and blows intensively on the ends of the conductor hanging point,difference in rates of wind load between the two conductor hanging points and design specifications is 38.69%.The result can explain why windage yaw may trip although the actual wind speed does not exceed the design wind speed.