Abstract: The invention relates to a measurement device (1) for measuring a current in at least one cable shield of an electrical transmission grid using the Zeeman effect in the presence of a magnetic field (BT) from the environment, in particular the Earth's magnetic field or magnetic noise, comprising: at least one assembly of one or more measurement cells (3, 3?), at least one source of polarized light (7), at least one polarimetry system (11), in which the assembly of one or more measurement cells (3, 3?) is configured so as to define at least one pair of first and second measurement sections (I1, I2), the measurement sections (I1, I2) of a pair being parallel and arranged perpendicular to a conductor (31) that is connected to the cable shield and on the opposite sides of the conductor (31), the polarized beam of light (9) flowing through the second measurement section (I2) in the opposite direction with respect to through the first section (I1) so that the contributions of the magnetic field from the environme

Abstract: A detection device for detecting a short circuit current in an electrical power transmission cable having an electrical power transmission cable for a high-voltage DC network. The network includes a central core, an insulating sheath, a metal screen arranged around the insulating sheath, at least one optical fibre, arranged between the electrically conductive central core and the metal screen by forming windings around the central core in a detection region, two optical transmitters arranged at the ends of the electrical power transmission cable, two optical detectors arranged at ends of the electrical power transmission cable, two interruption devices arranged at the ends of the electrical power transmission cable when a change in the angle of polarisation with respect to a reference angle greater than a predetermined value is detected by the first optical detector.

Abstract: A field grading material (1) includes a polymeric matrix and at least one electrically conducting filler, where the electrically conducting filler is polyaniline.