CORONA SUPPRESSION IN HIGH VOLTAGE WINDINGS

摘要

An arrangement for reducing voltage stress and corona discharge in high voltage insulating material utilizes thin conductive layers embedded within the insulation. Each conductive layer serves as an equi-potential surface which grades the voltage drop across the insulating material, thereby reducing the chance of corona discharge. For insulation which encloses a conductor having a curved edge portion lowest electrical stress in the insulation is obtained when the stress at the curved edge portion of the conductor is equal to the stress at the corresponding curved outside surface of the conducting layer. This condition is satisfied in the present invention by making the spacing distance of the conducting layer from the conductor in the curved region equal to the geometric average of the radius of the curved conductor edge and the radial thickness of the insulation.