750 kV扩径导线的运行情况总结

我国750 kV 输变电示范工程线路全长140.705 km, 其中使用了24.462 km 的扩径导线。输电线路使用扩径导线, 直接投资有所降低, 但运行中损耗增加。如果750 kV 线路载流较小, 可以考虑使用扩径导线,较大时不宜采用扩径导线。展放扩径导线时发生了跳股现象, 发生跳股的原因是导线通过滑轮时发生跳股的股线受到了两侧导线的挤压。经过1 年多的运行, 扩径导线没有发生明显变化。

Operation Summary of the 750 kV Oversized Conductor

The total length of the nation's 750 kV power transmission demonstration line is 140.705 km,among them,24.462 km using oversized conductor.The application of oversized conductor reduces cost,but increases operating loss.Only when the carrying current of the 750 kV line is low enough,can oversized conductor be considered.Otherwise,it should not be used.The cause of strand jump during stringing is that the jumped strand that s is squeezed by conductors on both sides when conductor goes through the pulley.After more than one year's operation,there is hardly any change in the oversized conductor.