故障点接地电阻对超高压输电线路潜供电流的影响

通过采用戴维南定理的理论分析和电磁暂态计算程序的计算，对故障处的接地电阻对潜供电流的影响作了深入研究。理论分析结果表明，接地电阻是否需要详细模拟取决于线路采取何种熄弧措施。在无并补线路和采用并补国小电抗的线路中，接地电阻的变化对潜供电流影响很小，而在采用快速接地开关的线路中则影响很大，此时应考虑详细模拟包括弧道在内的接地电阻。电磁暂态计算结果表明，理论分析正确合理。

Effects of Grounding Resistance on Secondary Arc Current in Extra-High-Voltage Transmission Lines

Empirical numerical value of grounding resistance is often used in secondary arc current calculation. The effects of grounding resistance on secondary arc current are analysed by use of the Thevenin theorem. The method of secondary arc extinction determines whether or not the grounding resistance needs to be modeled in detail. The grounding resistance has little effect on secondary arc current in transmission line with and without shunt compensation while it should be considered in detail (the secondary arc may need to be included) in transmission line where high speed grounding switches (HSGS) are used. It is also verified by the calculation of electromagnetic transient program (EMTP).