I would like to simulate a short length transmission line in MATLAB/Simulink. In the library, there is a block that simulates a transmission line. The parameters that are required are the resistance R, the impedance L and the capacitance C of the line. However, the capacitance effect is not present in a short transmission line but Simulink does not accept zero (0) as a capacitance value. So, I am thinking of putting a very small capacitance value (1e-09). Do you think that I am going to have an accurate simulation or I should put another capacitance value? What do you propose?
If you want to simulate a transmission line, you must choose its impedance.
From there, via the Telegrapher's Equation, you can get an equivalent L per unit length, and C per unit length, which together will give you that impedance.
For a short length of line, length << wavelength, the open circuit capacitance will be given by this C per length.