Abstract: With the large-scale application of insulated wires, the probability of disconnection faults in the distribution network has increased. Given the problem of the influence of inverter interfaced distributed generation（IIDG） on the characteristics of traditional disconnection faults, this paper analyzes and simulates to verify the fault characteristics of the disconnection fault when the IIDG is connected to the distribution network. First, a fault model of the distribution network containing IIDG is established, and the zero sequence voltage expressions are derived for both sides of the fracture under three fault forms: single-phase disconnection without grounding, single-phase disconnection power-side grounding, and single-phase disconnection load-side grounding. Secondly, by drawing a phasor diagram, the influence of fault location,transition resistance and output characteristics of IIDG on the zero sequence voltage distribution on the system side is analyzed. Finally, the changes of zero-sequence voltage under different rated capacities of IIDG are analyzed. Theoretical analysis results show that only the IIDG downstream of the fault point can affect the zero-sequence voltage distribution trajectory. The simulation results verify the rationality of the analysis described in this paper and the correctness of the analysis results.