抄録
Covering the electrode with a dielectric layer improves SF6 gas insulation systems. To raise the reliability of this method for application to high voltage power equipment, a mechanism was studied in which the coated electrode has higher breakdown field than a bare electrode by observing the discharge light. By observing the discharge inception point, two things became clear. First, if the harmfulness of micro protrusions on the electrode surface is small, discharges start from a position in the gas space away from the coated electrode surface. Second, the position of the discharge inception point shifts from the electrode surface to the gas space by covering it with a thick dielectric layer.
