榄普一线500kV线路取消架空地线防雷性能分析

榄普一线500 k V线路由于地线覆冰严重,多次出现线路跳闸、地线断裂等事故,因此需要将架空地线取消。结合行波法和ATP-EMTP电磁暂态分析,对取消地线前后榄普一线的耐雷强度进行了仿真计算。计算结果表明,取消地线后雷击基本都变为绕击,并且绕击耐雷强度和反击耐雷强度均有所降低,需要采用其他防雷措施进行保护。

Analysis of Maximum Allowable Lightning Current on Lanpu No.1 Line When Canceling Earth Line

Lanpu No.1 overhead transmission line has occurred many line trip and fracture of earth line by the reason of seriously covering ice of earth line. So it’s a necessity to cancel the earth line. By using the traveling wave method and Electromagnetic Transients Program, this paper calculates the maximum allowable lightning current of Lanpu No.1 line with and without earth line respectively. The result shows that firstly, when canceling the earth line, the lightning always strikes the transmission; secondly, the maximum allowable lightning current decreases whether it’s lightning shielding failure or back flashover. So Lanpu No.1 line needs other protection measure.