Calculation and measurement of rail impedances applicable to remote short-circuit fault currents

The authors present a detailed analysis of appropriate electrical impedance models for steel railway rails suitable for power supply circuit transient calculations. They extend existing models to fully describe the skin effect, so that power circuit transient behaviour can be taken into account with little error in prediction of response. Practical measurements of rail impedance are compared with calculated values of circuit impedance and demonstrate an accuracy of within 9% for resistance and 18% for inductance. An associated paper (see ibid., vol.139, no.4, p.289-94, 1992) shows how this model can be used to predict remote short-circuit-fault substation current profiles.< >

[1]  S. Ramo,et al.  Fields and Waves in Communication Electronics , 1966 .

[2]  D. C. Carpenter,et al.  The effects of magnetic saturation, hysteresis and eddy currents on rail track impedance , 1989, Proceedings., Technical Papers Presented at the IEEE/ASME Joint Railroad Conference.

[3]  B. Mellitt,et al.  Calculation of remote short circuit fault currents for DC railways , 1992 .

[4]  Howard M. Trueblood,et al.  Investigation of Rail Impedances , 1934, Transactions of the American Institute of Electrical Engineers.

[5]  A. E. Kennelly,et al.  Experimental researches on the skin effect in steel rails , 1916 .