Energy recovery device on at least one power conductor and method for manufacturing the recovery device

The invention relates to a device for recovering (1) electrical energy comprising a ferromagnetic cable (2) wound in a spiral around a portion (3) of a power conductor (4), and arranged to form both a magnetic system capable of capturing the magnetic field induced by a current (I1) passing through the power conductor (4) and means for generating a usable induced voltage (U2) from said magnetic field. To this effect, the ferromagnetic cable (2) is made using an assembly of individual filaments (20) made of ferromagnetic material, said filaments being assembled in the form of a strand, each individual filament (20) behaving as a coil in which the induced voltage (U2) is induced and the assembly of individual filaments (20) forming an assembly of coils connected in parallel by connecting terminals (6) provided at the ends of the ferromagnetic cable (2) two recover the induced voltage (U2).