Analysis of corrosion and fracture causes of grounding flat steel for 220 kv Qian’an I line tower

The grounding flat steel (GFS) of 220 kV Qian’an I TT experienced corrosion and fracture during operation. To determine the source of corrosion and cracked GFS and understand its service life and health status, a comprehensive experimental analysis was conducted on the fractured GFS, using methods such as appearance analysis, microstructure detection, and rust product energy spectrum research. The outcomes showed that the transmission line’s location in Bameng’s Huangqu District was the primary cause of the rust damage to the GFS of the 220 kV Qian’an I TT. For an extended period, GFS has been functioning in alkaline, high-salinity soil that includes a lot of chloride and sulphate ions. Significant corrosion damage ultimately resulted from the integrated effects of soil chemical, electrochemical, and stray current corrosion.