Abstract
With the aim of comparative analysis of main calculation methods of series impedance matrix for 1520 mm rail track gauge in audio frequency range a brief mathematical formulation revue of two methods for calculation of traction rails' impedance with consideration of earth return current has been carried out. The applicability of Carson's method and complex depth of earth return method for calculations of impedance of 1520 mm track gauge in frequency range 1..100000 Hz have been confirmed. The observed differences of calculated results and measured data may be eliminated by correct choice of parameters in the calculation formulas.
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