Transient phenomena of rectifier fault current has been analyzed until to now in various ways. In this paper, shows a method for display about rectifier fault current at transient condition. This device consists of a braun tube oscilloscope and a pulse generator and we can see a transient phenomena of rectifier fault current on a braum tube oscilloscope screen as a static figure at any fault condition. This method can be obtained easily when gate pulses for rectifier and sweep pulses for brawn tube oscilloscope are given suitably. In our case, using logic circuit and multi-channel oscilloscope, obtain transient current at any conditions.
