Impedance of single phase aerial cable

[Fullelove]

I want to calculate the resistance and reactance of a 25kV single phase (railway) cable from the Track Sectioning Cabing (TSC). There are 2 cables , the active and the return path cable.

(I have some theory but this all relates to 3 phase cable. Does the polarity of the currents have any effect?) Is the GMD just the distance between the cable and the GMR a standard for single core cables)

The cable is XLPE, Cu single core cable.

Thanks very much for this.

 

[jghrist]

Fullelove,

You mention active and return path cable and polarity of the current. Are you talking about ac or dc? Single phase-to-ground or is the load between phase-to-phase? If phase-to-ground, is the cable shield part of the return path? Is the shield grounded at both ends?