A Research on Inductance Forcedly Absorbing Current to Reduce Stray Current in Metro

The stray current of metro corrodes the buried metal pipe, line and steel structure greatly. To inhibit the flow of stray current into the ground, an inductive force current absorption circuit (IFACC) is analyzed in this paper. It makes the traction current flow back to the traction substation through reflux current wire (RCW) to reduce rail potential, so as to achieve the purpose of inhibiting the stray current leakage. On this basis, the three-layer return flow model of “rail-buried metal-earth” is designed. Based on the circuit mathematical model, we analyzed the working principle of IFACC and the stray current. And The function of IFACC is verified by MATLAB simulation and low voltage experiment. The research results show: it is in the traction power supply system equipped with IFACC that the current flowing through the rail is significantly reduced, and most of the backflow is carried out through the RCW. It is verified that IFACC has a good effect of inhibiting stray current.