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Power transmission line

  1. May 25, 2014 #1
    I need to derive this equation (attached), can you help me please?

    That's the equation for a two-pair terminal medium-distance power transmission line (20~100km).
    I have no idea how to start it. Can someone guide me, please?

    Attached Files:

  2. jcsd
  3. May 27, 2014 #2


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    Staff: Mentor

    Hi MissP.25_5. Perhaps a clue lies in that bottom line. :wink:

    Try a Pi network, with the two vertical limbs each a capacitor, and the horizontal part R + L.

    So this leaves the earth as a straight-through link common to both ports.

    Note, I haven't examined this further.
  4. May 27, 2014 #3
    Oh, yes! That's right, the Pi network is the solution! I just solved it, thanks to you!
  5. May 27, 2014 #4


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    Staff: Mentor

    Glad it worked! http://imageshack.com/a/img593/2259/girlpower.gif [Broken]
    Last edited by a moderator: May 6, 2017
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