AC/DC differential protection method for 12-phase rectification generator

The invention provides an AC/DC differential protection method for a 12-phase rectification generator, and the method is used for recognizing an internal fault of the 12-phase rectification generator,so as to facilitate the fault isolation, and reduce the unnecessary loss. According to the invention, the problem that the internal fault of the 12-phase rectification generator cannot be identifiedcan be solved. Whether the AC side current and the DC side current meet the current characteristics of normal operation or not can be judged by collecting the AC side current of the 12-phase winding and the DC side current of the rectifier bridge and combining the series-parallel connection relation of the rectifier bridge, so that whether an internal fault occurs or not is judged. When an internal short circuit and a grounding fault of the 12-phase rectification generator occur, the fault can be rapidly judged, measures such as fault isolation and power supply recovery of a protection systemare provided, and further e