The single-phase slow charging mode of large-scale EV(Electric Vehicle) in residential district can cause serious three-phase unbalance of power system in the district,which will cause non-negligible impact on distribution network.An automatic balancing EV three-phase charging load selection device is designed for solving this problem.The selection device can automatically select the highest voltage phase as the EV charging power,while disconnecting the other two-phase connection.Under the action of the lin...