Simulation of Functionally Graded Material (FGM) for Cable Joint in AC and DC Field Optimization

Application of functionally graded materials (dielectric materials with spatial variated permittivity or conductivity distribution) is a promising approach for the electric field optimization in cable accessories. In this paper, we uses a multi-layer optimization approach to design the permittivity and conductivity distribution in cable joint insulation, which are intended to be applied in AC and DC applications, respectively. The results shows that the electric field intensification phenomena were inhibited after the optimization process. Moreover, the degree of E-field optimization is affected by the permittivity/conductivity range, the layer number and the direction of layered permittivity/conductivity gradient.