Author(s)

V. Staudt & D. Wurgler

Abstract

Interference assessment: Comparison of reed track circuit computer model and DFT based analysis V. Staudt', D. Wurgler^ * Institute for Generation and Application of Electrical Energy, Ruhr-Universitat Bochum, D-44780 Bochum, Germany , CH-3661 Uetendorf, Switzerland Abstract Compatibility of electric traction vehicles with existing signalling systems is usually assessed by comparing a frequency domain representation of the line current of the vehicle with frequency domain limits. This frequency domain representation of the current is normally reached by applying a Discrete Fourier Transform (DFT) or a Fast Fourier Transform (FFT) algorithm to a time interval of the current. The length of this time interval (window length) and the way in which the values in this time interval are weighted (window function) influence the frequency domain representation considerably and must therefore be selected in accordance with the signalling system to be protected from interference. This

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