Because the voltage grade is higher and the transmission distance is longer in EHV lines, the transient course after faults is complicated.

• 在超高压输电线路中,由于电压等级较高,距离较长,因此发生故障后,暂态过程比较复杂,特别是并联电抗器的投入使用,进一步加剧了暂态过程。