Investigation of Rail Impedances

Impact of rail impedance intrinsic variability on railway system operation, EMC and safety

“…Although these equations may lead to some variability due to approximations of geometric terms and secondary effects, such as proximity, they are considered accurate and most of all "inspectionable", where calculations can be verified and repeated at will, including sensitivity analysis [25,26]. Attention is conversely focused on the intrinsic parameters specific to the rail that as we will see cannot rely on modeling for an accurate quantification; they are the DC resistance, the AC resistance and internal inductance [24,[27][28][29][30][31][32][33][34].…”

Accurate track modeling for fault current on DC railways based on MATLAB/Simulink

“…(iv) Considering the special structure of Beijing transit system, the third rail is used as positive power-supply line, while the up-running rail and down-running rail are shuntwound as negative line. Published work has presented measurements of rail resistance and inductance at power frequencies and traction level currents [21,22], or track impedance parameters at signaling level currents using transmission line models over frequencies from 50 Hz to 60 kHz [19,20,23]. Most paper of AC railway use FFT to analysis the transient impedance.…”

Analysis of Material Effect on Rail Impedance

“…Several papers were presented for impedance analysis of iron rails [1]- [11]. Few papers presented detailed analysis of the rails impedances [8] - [10], which lack rail material effect on the rails impedances.…”