As the surface conditions play a significant role on corona discharge and its related effects of the conductors, the influence of fine particulate matter on positive-polarity, direct-current conductors was studied experimentally in this study. The surface morphologies of the conductor could be discovered from the experiments. The typical morphologies are the parallel chains of particles. To evaluate the surface condition quantitively, the surface roughness of the conductors is measured. It is found that the applied voltage and testing time have a great influence on the surface condition. After that, the corona characteristics of conductors are tested. It reveals that the total ground level electric field and ion flow density increases with the surface roughness growing.

由于表面条件对电晕放电及其对导体的相关影响起着重要作用，因此，本实验通过实验研究了细颗粒物对正极性，直流导体的影响。导体的表面形态可以从实验中发现。典型的形态是颗粒的平行链。为了定量地评估表面状况，测量导体的表面粗糙度。发现施加的电压和测试时间对表面条件有很大的影响。之后，测试导体的电晕特性。结果表明，总的地面电场和离子流密度随表面粗糙度的增加而增加。