Research On Calculation And Characteristics Of Surface Charge On Epoxy Composite Insulation Under Dc Voltage

In this paper, the epoxy composite insulating material is selected as the experimental sample. After the samples being charged under different voltages with different duration in SF 6 of atmospheric pressure, the surface potential distribution is measured with a Kelvin electrostatic probe. The 2dimensional Fourier transform with Wiener filter technique is applied to calculate the surface charges density distribution. The results reveal that the surface charges density shows a good correspondence with the surface potential, and the whole measuring system presents a definitely high spatial resolution.