Adaptive approach to finite element modelling of corona fields

A methodology is proposed for simulating the corona field under a high-voltage DC (HVDC) transmission line. In the finite element modeling of corona fields, the area close to the corona electrode needs the finest discretization due to a significant difference in size and curvature of electrodes. User-defined discretization may yield insufficient accuracy. In the approach presented here, the domain is discretized adaptively according to an algorithm based on information about the solution error. There are two advantages of such an approach: mesh generation is completely automatic, and the resultant mesh has the optimum density for the assumed accuracy. This adaptive algorithm has been demonstrated for several HVDC transmission line configurations.<>