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This paper presents the modeling and simulation of a 25 kV 50 Hz AC traction system using power system block set (PSB) / SIMULINK software package. The three-phase system with substations, track section with rectifier-fed DC locomotives and a detailed traction load are included in the model. The model has been used to study the effect of loading and fault conditions in 25 kV AC traction. The relay characteristic proposed is a combination of two quadrilaterals in the X-R plane. A brief summary of the hardware set-up used to implement and test the relay characteristic using a Texas Instruments TMS320C50 digital signal processor (DSP) has also been presented.

MATLAB/PSB based modeling and simulation of 25 kV AC railway traction system - a particular reference to loading and fault conditions