Measurements of space charge density under HVDC conductor based on aspirator-type charge meter

With the occurrence of the hazy weather in China, the electromagnetic environment problem, especially the ionized field and space charge density becomes more complex. In order to measure the charge density near the ground level under the DC high-voltage conductors, an aspirator-type charge meter with vertical metal meshes was designed and utilized. The measurement device was calibrated in the total electric field generated by parallel metal mesh and plate. Moreover,charge densities near the ground level under the unipolar direct current high voltage line were measured by the calibrated ion counter, and the distribution of the charge density at ground level was calculated by the flux tracing method. Experiment and measurement results have shown that relative errors between the measurements and 2D and 3D calculations are 6.6% and 4.1%, respectively. This work may lay a research foundation of the charging characteristics of the ions near the ground level under the DC high-voltage conductors.