# Homework Help: Calculating distributed parameters based on given Pi model

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1. Apr 13, 2015

### Bababarghi

1. The problem statement, all variables and given/known data
In a course I am studying, I have been asked to calculate the distributed parameters of a line whose Pi model has been provided. I simply quote the question here for clarity of my question:

2. Relevant equations

$$C = \frac{{2\pi \varepsilon }}{{\ln \frac{b}{a}}}$$
$$R = \frac{1}{{2\pi {\sigma}{\delta _s}}}\left( {\frac{1}{a} + \frac{1}{b}} \right)$$
$$L = \frac{\mu }{{2\pi }}\ln \frac{b}{a}$$
$$\tan \delta = \frac{G}{{\omega C}}$$

3. The attempt at a solution

I was hoping to use above equation to solve the problem but then I realised the conductor material i.e. its conductivity, permeability, etc. is missing. Therefore all above equations would be of no use in this case.

Now the question that I can not get my head around it, is what approach will get me from lump Pi model parameters to line distributed parameters? Note that I am looking for guidelines, not the actual solution.

Thanks

2. Apr 19, 2015

### Greg Bernhardt

Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?

3. Apr 20, 2015

### Staff: Mentor

Have you tried a google search?

4. Apr 20, 2015