Linee ferroviarie per alta velocità a 3 kV c.c.: predeterminazione della distorsione armonica nel sistema trifase di alimentazione

A presentation is made in this article of a suitable methodology for the study of the predetermination of the harmonic distortion of the voltages and currents of the high voltage feed system of railway lines-for high speed electrified at 3 kV d.c. The illustration of the methodology is presented with applicative reference to the case of the new FS line Milan-Florence at present in the project phase. Lastly an analysis is made of the possibility of characterizing the stochastic variations of the harmonic currents due to the traction load on the basis of the average arithmetic values in pre-fixed time intervals and of the relative standard deviations, for the purpose of differentiating the disturbance in the feed system in terms of duration, also with a view to possible similar distinctions on the normative level.