Articles techniques et présentations

The loaded underground high voltage cable generates magnetic field with industrial frequency. Depending on the current rating and cable allocation, the magnetic exposure to public area may exceed the requested limit from customer. Extra shielding should then be applied. A primary FEM study shows that aluminum plate has a good shielding effect; the installation condition of the plate can however have an influence on it. In this work, a detailed study is presented: a complex experiment is constructed for a three phase cable system and a 3D FEM model is built to simulate the experiment. At the symmetric positions, the measured values are comparable to the simulated total magnetic flux density for the case of symmetric loading, i.e. each phase loaded with the same amount of current. A big discrepancy is found, if the cables are asymmetrically loaded.