Influence of Wind and Conductor Potential on Distributions of Electric Field and Ion Current Density at Ground Level in DC High Voltage Line to Plane Geometry

Lateral profiles of electric field and ion current density at ground level were measured precisely in a unipolar/bipolar line to plane geometry under different wind conditions and different dc voltages. Furthermore, the relationship between the field and current density is discussed. In the case of unipolar line in still air, the normalized profiles are approximately independent of the magnitude of the applied voltage and the linear dimensions of the gap, but they are strongly influenced in the bipolar case. The wind effect on the current profile is greatest at voltages close to corona onset for each experimental arrangemeht. The experimental results suggest that the usual wind extends the region of the ionic current flowing . e. the right-of- ay required for HVDC transmis-sion lines) by a factor of two or more as compared with that with no wind.