Fault protection method and device for train traction motor and train

The invention provides a fault protection method and device for a train traction motor and a train, and can be applied to the technical field of vehicle control. The method comprises the following steps: acquiring current signals and voltage signals of three phases in the traction motor, wherein the three phases are three alternating current phases flowing through a stator winding of the traction motor; based on the current phase information of the current signals of the three phases and the voltage phase information of the voltage signals of the three phases, fault detection is carried out on the traction motor, and a detection result is obtained; under the condition that the detection result shows that the traction motor has a fault, the working states of a traction converter and a coupling are controlled, the working state of the coupling represents the mechanical connection condition of the traction motor driving the train to run, and the working state of the traction converter represents the power supply