Protection system of a railway vehicle traction system, associated transmission line and associated railway vehicle

A protection system of a railway vehicle traction system, said traction system comprising:

• an electric motor and an electrical power supply circuit of the electric motor;
• a mechanical coupler between first and second components of a transmission line, the first component being connected to an output shaft of the electric motor and the second component being connected to an input shaft of an axle of the railway vehicle, the coupler being able to be in an engaged state, in which a torque can be transmitted between the first and second components, or in a disengaged state, in which no torque can be transmitted between the first and second components;
• and
• a controller for applying a disengagement signal to the mechanical coupler, so as to switch the mechanical coupler from the engaged state to the disengaged state if a failure is detected affecting the power circuit of the electric motor and/or the electric motor itself;
• wherein the coupler includes at least one securing element for securing the first and second components to one another and a pyrotechnic module able to break the securing element when a disengagement signal is applied by the controller, and
• wherein the first and second components are first and second flanges facing one another, and wherein the mechanical coupler is an explosive bolt securing the first and second flanges to one another.