中文摘要：

针对超、特高压交直流同塔多回线路Ⅰ-Ⅴ型和单Ⅰ型绝缘子串布置的塔型,采用刚体直杆模型法计算悬垂绝缘子串风偏角,建立了杆塔防风偏闪络可靠度计算模型;并以±800kV/330 k V和±800 kV/750kV交直流同塔多回线路两种塔型为例,采用SORM方法编程求解其防风偏闪络可靠度指标。结果表明：工频电压下发生风偏闪络故障概率最大,在设计中可以只校核工频电压下的风偏;下横担、中横担和上横担处发生风偏闪络故障的概率依次增大,即防风偏闪络可靠度水平依次略微降低;两种塔型防风偏闪络可靠度均满足正常使用极限状态目标可靠度指标1.5的要求,其中导线对其所在横担下表面闪络可靠度相对较低,可通过适当增加绝缘子串长度提高其可靠度。

英文摘要：

For extra and ultra high voltage AC and DC multi-circuit lines on one tower of I-V and single I type insulator string arrangement,calculated wind angle of insulator string by rigid straight bar model method. Then,taking ± 800 k V /330 k V and ± 800 k V /750 k V DC and AC Towers with multi-circuit for example,solved their reliability indexes of trip prevention from windage yaw with the method of SORM. Result shows： The probability of wind partial flashover occurring at the power frequency voltage is the maximum,so only windage yaw at the power frequency voltage is needed to be checked in design. The probability of wind partial flashover occurring at below,middle and up cross-arms under each condition gradually increases,that is to say,the trip prevention reliability from windage yaw slightly reduces in succession. The trip prevention reliability from windage yaw of both two towers meets the target reliability index 1. 5 of serviceability limit state,where in the reliability of conductor to below surface of its cross-arm is relatively lower,which can be improved by increasing the length of insulator string.