# How to figure out at which point a SWER line stops being economically feasible when compared to a regular single-phase line?

I wish to simulate a transmission line and it's losses according to load, length and type of conductor, each one having their own characteristics such as impedance, radius, cost, etc.

My goal is to figure out at which point a single-wire earth return line stops being economically feasible when compared to a regular single-phase line.

I'm familiar with "normal" circuit simulation with programs like LTspice and Psim, but I don't know how I can use them to tackle this problem. It seems to require a lot of different simulations, at least one for each type of conductor, with different parameters.

After all those simulations I also have to make sense of the results. How can I do that?

• Someone needs to itemize all the costs en.wikipedia.org/wiki/Single-wire_earth_return#Cost_advantages – Tony Stewart Sunnyskyguy EE75 May 10 at 19:21
• @SunnyskyguyEE75 I think the number of poles per km and maintenance costs can be included after. The question remains as to how I can simulate and compare these types of lines in regards of their losses. – lolo May 10 at 19:45
• You have to know power loss of earth vs Neutral and costs of everything – Tony Stewart Sunnyskyguy EE75 May 10 at 21:06
• @SunnyskyguyEE75 Yes, they're all given by tables and calculation. How would I change the parameters for several different simulations? – lolo May 11 at 2:33
• Use a spreadsheet with the break even cost graphed – Tony Stewart Sunnyskyguy EE75 May 11 at 4:33