ELECTRIC TRACTION SYSTEM FOR A RAILWAY VEHICLE ; PROTECTION METHOD REALISED BY SUCH A SYSTEM

This system (10) comprises a power converter (22) for a synchronous electrical machine (14) to which it is connected by cables (23, 24, 25), an isolation device (26) and means (27) for short-circuiting the phases of the machine, the system comprising means (32, 30) for primary detection of an overcurrent in the converter and safety means (64) suitable for opening the isolation device (26) upon receipt of a primary detection signal emitted by the primary detection means. [0002] The system comprises means (62, 60) for secondary detection suitable for detecting a short-circuit downstream of the isolation device and for emitting a secondary detection signal towards the safety means (64), the latter actuating in closure the means (27) provided that they have already received a primary detection signal which led to the opening of the isolation device.