HV and EHV transmission lines are equipped with split-phase breaker.If a longer reclosing time is setting in a heavy load line,the system may swing after the trip without fault of remote breaker.

• 高压、超高压输电线路的开关为分相开关,当对侧开关单相偷跳后,在线路负荷比较重、同时重合闸动作时间比较长的情况下可能引发系统振荡。