I need to add lossy power line in LTSpice model to be able to simulate the signal transmission over this line.

This means that I will need two components:

  • 230 VAC power source model

  • asset power line model

Like that:

enter image description here

I did find ideal lossless transmission line model:

enter image description here

But this is not that I need. Is there any off the shelf solution?

If not: how do I build it my self?

  • \$\begingroup\$ Take a look at this link. Might have to create your own for the particular situation. Look at the help included with LTSpice, it's pretty good. \$\endgroup\$ – rdtsc Jul 19 '15 at 19:11

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 – 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.

  • \$\begingroup\$ PS. Actually I'd keep your answer in "slow simulation" question too. Or it is not good for some reason? \$\endgroup\$ – Roman Matveev Jul 24 '15 at 19:14

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