IMPROVED CALCULATION OF FINITE-ELEMENT ANALYSIS OF BIPOLAR CORONA INCLUDING ION DIFFUSION

This paper presents an iterative method for the analysis of bipolar co rona associated with the ionized field around high-voltage bipolar dir ect-current (HVDC) transmission-line conductors, A new finite-element technique (FET) is proposed to solve Poisson's equation where the cons tancy of the conductors' surface field at the corona onset value is di rectly implemented in the finite-element formulation, Satisfying the c urrent continuity condition and updating the space-charge density are based on the application of Kirchoff's current balance law at each nod e of the finite-element grid and take the ion diffusion into account, In order to investigate the effectiveness of the proposed method, a la boratory model was built, It has been found that the calculated V-I ch aracteristics and the ground plane current density profiles agreed wel l with those measured experimentally. The simplicity in writing the co mputer program, in addition to the low number of iterations required t o achieve convergence, characterize the new method of analysis.