特高压长串绝缘子对风偏计算的影响研究

输电线路的风偏角计算所采用的都是刚体静力学模型。为了简化计算,该模型将绝缘子串和导线假设为刚体,风吹时绝缘子串不发生任何弯曲或变形。特高压线路的绝缘子串较长,风吹时其链式弯曲程度较低电压等级输电线路的绝缘子串要大,需要研究其对线路风偏角的影响。通过数值仿真计算和风偏模拟验证试验得到的结果表明,特高压线路采用棒型绝缘子可不考虑绝缘子链式弯曲的影响,但采用盘形绝缘子串,当绝缘子串两端相邻的导线悬挂点高于其自身时则需考虑,即按现有方法计算出绝缘子串的水平位移,并加上由链式弯曲引起的偏差值,否则将来可能存在特高压线路塔头部位风偏故障的隐患。

Research on the Windage Yaw Calculation of UHV Long Insulator String

Calculation of windage yaw angle of transmission lines is usually made by rigid body statics model. In order to simplify the calculation process, it is supposed in this model that the insulator string and conductor are rigid body, and no bending or deformation occur for the insulator string when wind blows. For the UHV transmission line, however, the chain structure bending extent of the UHV insulator string is higher than that of lower voltage transmission lines when wind blows because of its longer insulator string. It is therefore imperative to study the effects of long insulator string on the windage yaw angle of transmission lines. Numerical simulation and simulation verification test of windage yaw shows that when rod insulator string is used for UHV transmission lines, the effects of the chain structure bending can be ignored; but for the disk insulator string, when the adjacent conductor hanging points are higher than the insulator string itself, the effects shall be taken into consideration, i.e., the horizontal displacement of insulator string calculated by the existing method shall be added by the deviation value caused by chain structure bend of insulator string, otherwise the windage yaw fault may occur for the UHV tower head