Study on the Suppression of DC High Voltage Corona Discharge by Insulating Dielectric Film

we propose a method to suppress corona discharge in the transmission process of negative DC high voltage wire. Corona discharge is greatly restrained by coating transmission wires. Comparing the ion current density under bare wires with different diameters and coated wires, it is found that the larger the wire radius, the smaller the surface electric field under the same voltage, and the ground composite electric field intensity of coated wires is much smaller than that of bare wires. In terms of ground ion current density, the bare wires are at the order of μA/m
²
and the XLPE covered wires are at nA/m
²
. Under the condition of wires covered by film, the ground ion current density of XLPE coated wires with different thicknesses have no significant change with the increase of applied voltage. Two kinds of coated materials: PVC and XLPE are compared, and it is found that the ground ion current density of XLPE film wires is less than that of PVC film wires under the same condition.