With the development of overseas power transformation projects by Chinese power design companies year after year

the differences in design standards for grounding grids have become increasingly prominent issues in the implementation of international power project construction. Based on the analysis of IEEE std 80 and GB/T 50065

the similarities and differences between the two specifications in the selection of grounding conductors

the grounding criteria and the calculation method of shunt coefficients are presented. At the same time

the internal causes of the differences in the calculation results such as cross-section selection

grounding resistance

touch potential difference and step potential difference of the grounding conductor are analyzed in detail. Taking the design of grounding grid in a substation abroad for example

the above differences are compared in detail to provide a standard selection method for power engineers when designing a grounding grid for a foreign substation.