Medium-length Transmission Line

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Medium-length Transmission Line
Medium length transmission lines are “the transmission lines whose length is between 80 km and 250 km”. The voltage transmission ability of these medium length transmission lines is around 20 KV to 100 KV.
The calculation of admittance plays a vital role in analysis of medium length transmission lines. The lumped parameters of these medium length transmission lines are represented by three different methods. They are,
Here, the lumped parameter (impedance) is placed between two half admittances. The circuit looks similar to mathematical symbol P. Therefore, this model is termed as nominal P model. Write the parameters from the circuit as,
Nominal T method:
Figure 2 is the nominal T circuit.
Here, the circuit is look like a symbol T. Therefore, this circuit is termed as nominal T model of the medium transmission line. The lumped admittance is placed at the middle of the model. The parameters can be written from the circuit as,
End condenser method:
In this method, the capacitor (lumped parameter) is connected at the end of the model. The capacitor at the end analyzes the system.