Simulation topological structure for detecting ground fault identification of station terminal device

A simulation topological structure for detecting ground fault identification of a station terminal device comprises an interface board card, a power amplifier and a DTU device, and is further provided with an RTDS simulator, a transformer substation of the RTDS simulator is provided with an equivalent compensation no-load line group, a grounding mode switching assembly and a 1 # bus, and the equivalent compensation no-load line group is provided with an equivalent compensation no-load line group. The equivalent compensation no-load line group and the grounding mode switching assembly are connected with the 1 # bus. According to the simulation topological structure for detecting the ground fault identification of the station terminal device, equivalent compensation lines are adopted to match the capacitance current value of the whole system of a power distribution network in a reasonable interval, and the number of outgoing lines of a transformer substation is reduced. And the grounding mode switching assembly