With the development of power system capacity and ultra-high voltage transmission lines, protection for EHV transmission systems based on fault-generated transient becomes more and more noticeable.

• 随着电力系统容量日益扩大，EHV输电线路的电压等级越来越高，新型的基于暂态量的超高速动作的继电保护已成为超高压输电线路继电保护的发展趋势。