A Systematic EMTP Impedance Modeling Scheme Aimed at Train Body in High-Speed Railway

The voltage problem generally exists in the high-speed train (HST) and may influence the train’s normal operation. It is important to analyze the voltage of train body (TB) for safety protection. Taking China railways high-speed 380CL-type train as an example, by means of electromagnetic transients program, this paper proposes a systematic train impedance modeling scheme that is only aimed at low-frequency electrical conditions. Based on the effective analysis regarding the influence factors of TB voltages, this scheme is elaborated. At first, through investigation, only the modeling of impedance parameters of TB and rail is involved, and the measured operation grounding currents are selected as the external sources of model. Next, the model impedance parameters are determined by theoretical calculations or experimental measurements for establishing the final model. Last, based on three different HST operation conditions, experiments are implemented in the Chinese Nanjing electric multiple unit station. The effectiveness of modeling scheme is demonstrated by the comparisons of many model simulations and experimental measurement results, which not only indicates that the assumptions and simplifications in modeling are reasonable, but also illustrates that the scheme can assess the TB voltages for different low-frequency electrical conditions and different HST types.