脉动风作用下特高压绝缘子串的风偏特性

特高压线路比较低电压等级线路来说，具有绝缘子串更长，地理跨度更大，绝缘子串的动态风偏特性将更为突出的特点。建立了4档绝缘子串-导线整体数值模型，模拟了脉动风的风速时程曲线，通过改变风速、垂直荷载、导线型号和单/双联绝缘子串等因素，系统地研究了脉动风作用下特高压线路绝缘子串的风偏特性。结果表明：不同条件下特高压线路风偏角脉动响应系数β大致在1.1~1.2变化。风速一定时，绝缘子串风偏角随着导线截面增加而减小，在进行特高压线路绝缘子串风偏角计算时，双联复合、盘形绝缘子串可以简化为对应型号的单联复合、盘形绝缘子串。

Characteristics of Windage Yaw in UHV Insulator Strings under Fluctuating Wind

Comparing with low voltage lines, insulator strings are longer and geographic span is greater in UHV lines, hence dynamic characteristics of insulator strings windage yaw is more prominent. A numerical model of 4 spans insulator strings-conductor is established. Simulation study of windage yaw characteristics in UHV insulator strings under fluctuating wind with speed time history is performed by changing wind speed, vertical loads, conductor types and single/double insulator strings. The results show that fluctuating response coefficient β of UHV insulator strings is between 1.1~1.2 under different conditions. With constant wind speed, insulator strings windage yaw angle decrease as conductor cross section increase. Double composite insulators and disc insulators can be simplified as corresponding single type when calculating windage yaw angle of UHV insulator strings.