Transmission Line Parameters - Primary & Secondary Constants

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Transmission Line Parameters:

  • The performance of the transmission line depends on the line parameters
  • There are four transmission line parameters.
    • Resistance (R)
    • Inductance (L)
    • Capacitance (C)
    • Conductance (G)
  • Resistance:
    • Each conductor of the transmission line has a certain length and diameter
    • When the current is flowing through the conductor, it must have a resistance per unit length
    • It is denoted as 'R' and measured in 'Ohms/unit length'
  • Inductance:
    • When the current flows through the conductor, magnetic flux is produced around the conductor
    • When the current changes, the magnetic flux also varies due to which emf induces in it.
    • EMF produced in the line resists the current flow and denoted as Inductance (L)
    • It is measured in Henries/unit length
  • Capacitance:
    • In the transmission line, air acts a dielectric between the conductors.
    • It produces the capacitive effect
    • It is denoted as 'C' and measured in Farads/unit length
  • Conductance:
    • Due to the imperfections of the dielectric material, there is a leakage current in the dielectric medium.
    • This gives a rise in the leakage conductance
    • It is denoted as 'G' and measured in terms of 'mhos/unit length'

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Youtube video for this lecture is available: https://www.youtube.com/watch?v=7fZfXn2_Kb0


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