In view of the “red light band” phenomenon of 25 Hz phase-sensitive track circuit under the condition of maintenance and grounding, this paper constructed a computational analysis framework for abnormal identification and disposal output. Based on the six-terminal network transmission relationship, the section length, ballast resistance, reflux Settings and ground point position are written into the state space. The finite difference and cascaded recurrence methods are used to solve the track voltage of the receiving end, and the unified structure of grounding anomaly feature representation is constructed. The experiment covers three sections of 1.2 km, 0.6 km and 0.3 km, and two ballast resistance conditions of 0.6 Ω·km and 6.0 Ω·km. The results show that the reflux setting determines the location of abnormal occurrence, and the section length and ballast resistance affect the scope of the release area. The proposed dual-rail impedance grounding scheme makes the average reduction of rail voltage after grounding be 5.230%, the average experimental voltage reach 14.284V, the average relative error is -1.310%, and the mean square error is 2.139%.
