Because there are still a lot of substation without grounding line selection device in China

and the on-duty controller fails to stop manually when the single-phase grounding fault occurs in the power grid

the paper analyzes the characteristics of single-phase ground fault in the small current grounding system

and proposes a method to generate the grounding selection scheme based on fault history data and BP neural network.The single phase connection of the distribution line in the substation by BP neural network is trained by historical data of ground fault.When single-phase ground fault occurs again in the substation

BP neural network is used to give the route test stop scheme

through verification

the method is effective.