Method And Device For Recovering Electrical Energy From A Single-Phase Or Multiphase Power Cable

The invention concerns a device () for recovering energy from a single-phase power cable () comprising two phase conductors (C, C). It comprises a magnetic core (), in the form of an openable torus, installed around said power cable () to form a magnetic circuit able to pick up a magnetic field induced by a primary current passing through said phase conductors, and a detection coil () wound around said magnetic core (), to induce a secondary voltage from said induced magnetic field and deliver across said coil an output voltage usable to power electrical systems. It comprises a heterogeneous magnetic circuit to induce an asymmetrical magnetic flux flow in said magnetic circuit and maximize the output voltage of said detection coil (). In one embodiment, the magnetic core () is off-center with respect to the power cable (), the magnetic core () comprises two air gaps (E, E) of different widths, including a main air gap (E) positioned opposite and in alignment with the phase conductors (C, C), and the detection coil () is located in a zone of the magnetic core () opposite said main air gap (E).