Abstract: The traditional grounding material of domestic power plants mostly is sherardized flat steel, and the pure copper and copper plating steels are widely used as grounding material abroad. The sherardized flat steel and the copper plating round steel were compared in several aspects, such as the heat stability, the corrosion resistance, the grounding effect and the technology economy. The advantage of the copper plating round steel used in grounding grid was pointed out.

Key words: grounding grid, grounding material, sherardized flat steel, surface plating copper round steel, economical efficiency