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Effects of Varying Ionic Mobility on Calculated DC Ionized Field with the Presence of Atmospheric Particles by Upstream-BEM

Ionic mobility describes motion characteristics of ions in the electric field, and is also one of vitally significant parameters utilized in the calculation and prediction of ionized field strength of high voltage direct current (HVDC) power transmission. Atmospheric particulate matters make the ionized field problem more complex. This paper investigated the effects of varying ionic mobility on DC ionized field with the presence of atmospheric particles. Ionized field distribution, ionic current density, and space charge density were calculated by upstream-boundary element method. Calculation results illustrated that under certain applied voltages and corona inception field strength of the HV conductors, ionic current density changed proportionally with the varying ionic mobility. Impacts of particles’ mass concentration on the distributions of ionized field and current density were also calculated. The results can be of suggestive value to the design and operation of HVDC projects.