Rail Internal Impedance Calculation by Using Finite Elements Methods

In the present paper two new methods for the evaluation of the internal impedance of a rail are proposed. These methods are based on FEM and they consider different steel's magnetic behavior models. The first one is based on the normal magnetization curve and the equivalent sinusoid concept. In the second model, the hysteresis loops have been considered introducing the evaluation of complex magnetic permeability function. Rail's internal per unit length parameters are calculated in function of current and frequency. The results from FEM models are compared with the available measurements at the frequency of 50 Hz, and they are extended to other frequencies.