特高压输电线路路径长，潜供电弧难以熄灭，如果单相自动重合闸失败，将影响系统的安全和稳定，因此有必要对潜供电流进行研究。以1 000 kV特高压输电线路南阳—荆门段为研究对象，建立仿真研究模型，采用ATP-EMTP计算了线路长度、故障点位置、弧道电阻对潜供电流方法的影响，比较了快速接地开关和并联电抗器中性点加小电抗这2种抑制潜供电流方法在有并联电抗器的超高压和特高压输电线路中的应用效果。

UHV transmission line is long, so the secondary arc is hard to quench. If single-phase automatic reclosing fails, system security and stability will be impacted. Therefore, it is necessary to study the secondary arc current for UHV transmission lines. Taking 1 000 kV transmission lines from Nanyang to Jingmen as the research object, the simulation model is established in this paper to calculate the length of transmission lines, the fault location and the influence of arc resistance on secondary arc current, by applying ATP-EMTP. Finally, the application effect of two methods of extinguishing secondary arc current, high speed grounding switch and shunt reactors with neutral reactor, are compared for the EHV and UHV transmission lines with shunt reactor.