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