Resumen
The invention relates to a device which can compensate, at origin, the magnetic field perturbations in the surroundings of an electrically-driven train track caused by variations in the current of the power supply catenary.The object of the system is to create a return circuit with a geometry which varies with the position of the train, causing the suppression at origin of the field produced by the catenary-train-track circuit and thus reducing perturbations of the magnetic field in the surroundings.The system relies on shunting the return current from the track divided in to elementary segments insulated from each other, to a return conductor placed near the catenary and parallel to it, using a series of vertical conductors which connect each segment to said return conductor.