The requirements specified in the locomotive acquisition specifications for compatibility with the 50 Hz train detection systems usually result in severe design restrictions on the electric powered vehicles (EPV). They require bulky inductors and capacitors in the input filters of power electronic converters with associated weight and space problems. Usually the impedance of the locomotive is specified which implies a worst case 50 Hz substation supply voltage. This paper investigates the conditions necessary for this voltage to be present and presents simulation results obtained with the study. Simulation is also performed on proposed measurement setups to be employed during the practical measurement of locomotive impedance.
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