This paper researches on the modeling and simulation of distribution grid neutral hybrid grounding mode even when running mixed tuned voltage and single-phase operation over voltage level and protection configuration and fault line selection device when the system grounding fault. It concludes that the system over voltage level is better than the arc suppression coil grounding mode

which is consistent with the small resistance grounding method

and the simulation results are in line with the actual situation. When single-phase grounding fault occurs in the hybrid grounding mode

the protection configuration of the small resistance grounding mode is not affected

and the grounding mode of arc suppression coil is advantageous to improve the accuracy of fault line selection.