Corona characteristics of HVDC conductors with different surface conditions obtained in a controllable accelerating contamination depositing apparatus

Suspended aerosols in the vicinity of discharged HVDC transmission lines will be charged by ions and deposit on the surface of the conductors. In order to obtain the conductors with different contamination conditions, a controllable accelerating contamination depositing method by introducing a controllable ionized field is proposed in the present paper. The conductor samples contaminated by 3 typical patterns were prepared and the morphology of the conductor surfaces was characterized by scanning electron microscopy (SEM). The photon counting rate of the conductors and the electric field strength on the ground electrode were also tested. The anticipatory contamination depositing results were obtained, specifically, the surface conditions of the conductors could be improved or deteriorated, therefore, the corona discharge could be suppressed or enhanced in corresponding patterns of the proposed contamination depositing method.