Corona Characteristics in Conductor-to-Plane Gaps as Influenced by Nearby Floating Metallic Grids

This paper is aimed at investigating how the DC corona performance of conductor-to-plane gaps as influenced by a floating grid of metallic parallel wires underneath and parallel to the stressed conductor. The corona current-voltage and corona current density distribution at ground level are studied experimentally with and without floating grids. The wire-to-wire spacing, number, lateral distribution and height of grid wires are varied. It is found that the number and distribution of grid wires are the major factors that influence the corona onset voltage.