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The paper shows the present results of a long term research work. The authors are working on the modelling of penetration of harmonics caused by the railways. In a former paper (1) a detailed model of the traction system was discussed in frequency domain. However this paper presents the combination of frequency and time dependent model. This novel method, called double domain method is used to improve the accuracy of the frequency domain simulation. To calculate the sophisticated model of the electric locomotive as a non-linear load a time dependent model must be used. The traction supply system together with the equivalent supply network impedance could be calculated in frequency domain. An iteration algorithm is developed to converting the variables in every iteration step between the time and frequency domain.

Effect on power quality of the high power electric traction (Double domain computer simulation vs. site measurements).