500 kV同塔双回线路合理安装线路避雷器

Reasonable Installation of Line Arresters for 500 kV Double-Circuit Lines on the Same Tower

500 kV大房三线位于高山大岭地区的杆塔雷害较为严重。在投运之初,该线路连续3次发生雷击跳闸事故,且均为雷电绕击。冀北检修大同分部虽已在常规线路防雷方面取得了一定的运维经验,但同塔双回线路治理效果并不理想。为了提升该线路同塔双回区段杆塔雷害治理效果,大同分部结合常规线路雷害治理思路,提出了分别计算线路档段上、中、下三相导线跳闸率的计算方法。通过现场测量及查阅图纸等手段获取三相导线与地面的相对位置,利用工程仿真软件分别计算三相导线的绕击跳闸率,最终实现高山大岭地区同杆双回线路防雷性能的状态评价。运维单位将大房三线Ⅳ级雷害区内杆塔和档段的计算结果为依据,制定了大房三线同塔双回杆塔500 kV线路避雷器的安装方案,实现了避雷器合理安装。

The lightning damage to the towers of the 500 kV Dafang No.3 line in the mountains area is more serious.At the beginning of operation,the line had three consecutive lightning trip accidents,all of which were lightning shielding.Although the Datong branch of jibei grid has gained certain operation and maintenance experience in lightning protection of conventional lines,the governance effect of double-circuit lines on the same tower is not satisfactory.In order to improve the effect of lightning damage control on the poles and towers of the double-circuit section of the same tower,Datong branch combined with conventional line lightning control ideas,and proposed a calculation method to calculate the trip rate of the upper,middle and lower three-phase conductors of the line segment.Obtain the relative position of the three-phase conductor and the ground through on-site measurement and consulting drawings,and use the engineering simulation software to calculate the shielding tripping rate of the three-phase conductor respectively,and finally realize the state evaluation of the lightning protection performance of the double-circuit line on the same pole in the high mountains and large ridges.The operation and maintenance unit used the calculation results of the poles and towers in theⅣgrade lightning damage zone of the Dafang line 3 as a basis,and formulated the installation plan of the lightning arrester for the Dafang line 3,and realized the rational installation of the arresters.