220kV混合式的GIS变电站过电压保护

Surge protection of the 220kV SF6 Insulated Hybrid Substation

本文讨论220kV混合式GIS变电站过电压保护,用数值计算方法分析氧化锌避雷器对降低过电压的作用,并讨论了有一种类型的过电压可能对GIS要求更为严格,即在主回路中用GIS隔离开关(GIS—G)切除空母线引起某些高频操作过电压,因此在绝缘配合时要相应考虑。

This paper deals with the surge protection of a 220kV H—GIS and analyzes the effects of metal oxide surge attesters on reducing the incoming lightning overvolrages by means of numercal method Meanwhile, there is a kind of over-voltagey which may be rather critical for GIS, e·g·the switching surges with extremely high frequeuly produces by GIS-G switching-off of some loadless duses. Some corresponding considerations shonld be made in insulation coordination