The optimal reclosing time of transmission line varies with the operation mode of the system.In order to calculate the optimal reclosing time on line, a method based on EEAC is proposed.

• 线路的最佳重合时刻随系统的运行方式而改变，为了在线计算线路故障后的最佳重合时刻，文中将EEAC理论用于最佳重合时刻的计算。