How to simulate lossy power line on LTSpice?
If you're simulating a transmission distance less than 1/10 of a wavelength (so less than 60 km for a 50 Hz signal), you should get reasonable results replacing the LTRA element with a single pi or T section. For example, for a pi section you could use this in place of your 1000 m line:







simulate this circuit &ndash; Schematic created using CircuitLab

Note: Values based on your other question

If you want to increase the accuracy (or the length), you can simply use mulitple cascaded sections, making sure the total R, L, and C values add up to the right number and that they're evenly distributed along the line. It's also a good idea to try the simulation with, say, 1 and 2 sections and see that the result doesn't change very much, to verify that this approximation is good enough.