一例典型的220kV架空线路档中跳接方式分析

Analysis on One Typical Span Jumper Connection Mode of 220kV Overhead Lines

针对一例典型的220 kV架空线路档中跳接工程,为加快工程建设进度和节约成本,采用非耐张塔跳接方式。对这种跳接方式进行力学、电气和防雷计算,结果表明:跳接导线不会损坏原运行线路的导线和杆塔,连接金具可满足线路输送电流的要求,跳接线路处于避雷保护范围。指出施工中采用铝绞线、放松导线张力等措施可有效保护原导线,采用2根避雷线联合避雷方式可提高防雷效果。线路运行1个月后进行温度监测,结果显示线路处于正常运行状态。

In allusion to one typical span jumper connection of 220 kV overhead lines,tension tower jumper connection is used for quickening engineering construction progress and saving cost.Calculation on mechanics,electrical engineering and lightning protection is conducted for this kind of jumper connection mode,and results indicate that the jumper connection conductor would not damage conductors and towers of original running lines,connection of amour clamps may satisfy requirement for current transmission of lines and the jumper connection line lies in the range of lightning protection.It is pointed out that measures such as using all aluminium conductor（AAC）or releasing conductor tension may effectively protect original conductors,and it is able to improve lightning protection effect by using two lightning conductors combining with lightning protection mode.Temperature monitoring is carried out after lines running one month and results show lines are innormal states.