This paper addresses the problem in neutral ungrounded system that the fast fault point transfer arc extinguishing method cannot identify the original fault state during the grounding of the fault phase bus. The characteristic difference of measurable electrical quantities in the station is analyzed respectively in the case of heavy and light load. In the case of heavy load, if the fault of the original fault point is not eliminated, the earth branch between the two grounding points will divert the load current, and the formula for the current at the bus grounding point with superimposed load component is derived. The original fault state is judged by whether the current amplitude and phase offset exceed the threshold value. In the case of light load, if the original fault is not eliminated, the two grounding points in the same phase change the zero-sequence path of the system. The zero-sequence current in the fault line is calculated by the symmetrical component method when one point is grounded and two points are grounded, and the original fault state is identified by zero-sequence current offset. The identification procedure and motion flow to identify the original fault state during the grounding of fault phase bus are designed, and the proposed method is simulated and verified by ATP simulation software. This work is supported by National Natural Science Foundation of China (No. 51777067).