Résumé
This article presents a technique for non-intrusive measurement of space charge directly in cables using the thermal step method (TSM). The principle of the measurement consists of perturbing the electrostatic balance using a thermal step on the dielectric. After applying the thermal step, a displacement current representative of space charges is measured between cable electrodes. Numerical simulations are first presented to design the measurement bench, then the set-up and experimental results are presented and discussed.