Since most faults of 500kV lines are transient single phase grounding, single-phase auto-reclosure is widely used in EHV lines in order to clear up the fault and resume the power supply.

• 由于500kV线路的故障主要为单相接地的瞬时性故障，超高压输电线路广泛采用单相自动重合闸技术，以消除瞬时性故障并快速恢复供电。