Research and practice of copper-made grounding device technique in GIS substation project

Compared with traditional zinced steel grounding device ,the copper-made grounding device is eight times better in conductivity ,three times stronger in erosion tolerance ,and con-venient in construction ,which makes it fit for GIS ( SF6Gas-Insulated Swichgear ) substation groun-ding system.With the GIS substation projects for220kV substation and220kV power plant voltage-raising station as examples ,techniques for copper-made grounding device are introduced ,including cross sectional area calculation ,material selection and connection methods.The reliability of copper-made grounding device with different connection types is analyzed ,and cautions in construction are advised.