For three-phase, balanced transmission lines. Reports positive, negative, and zero sequence symmetrical components of line impedance. Lines are positioned as shown below with x and y coordinates and resistivity is selected based on type of earth below the line. Method is based on Power System Analysis and Design [1] pages 197 on. Earth is replaced with earth return conductors as shown in the Glover textbook referencing Carson [2]
https://github.com/rsparks3/power-line-impedance-calculator/tree/main
[1] J. D. Glover, T. J. Overbye, and M. S. Sarma, Power System Analysis & Design. Boston, MA: Cengage Learning, 2017.
[2] John R. Carson, “Wave Propagation in Overhead Wires with Ground Return,” Bell System Tech. J. 5 (1926): 539–554.
![](https://ryanmsparks.com/wp-content/uploads/2024/07/transmission-line-positions-1.png)
![](https://ryanmsparks.com/wp-content/uploads/2024/07/earth-resistivities.png)
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