How Do You Derive the Equation for a Medium-Distance Power Transmission Line?

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Discussion Overview

The discussion revolves around deriving the equation for a two-pair terminal medium-distance power transmission line, specifically within the range of 20 to 100 km. Participants explore methods and approaches to tackle the derivation, focusing on electrical circuit concepts.

Discussion Character

  • Exploratory, Technical explanation, Homework-related

Main Points Raised

  • One participant requests assistance in deriving the equation for a medium-distance power transmission line, indicating a lack of starting points.
  • Another participant suggests using a Pi network model, proposing that the vertical limbs represent capacitors and the horizontal part represents resistance and inductance (R + L).
  • A later reply confirms the Pi network approach as a solution, indicating that it helped the original poster solve the problem.

Areas of Agreement / Disagreement

There appears to be agreement on the Pi network model as a viable approach to the problem, but the discussion does not explore alternative methods or models in detail.

Contextual Notes

The discussion does not clarify specific assumptions or definitions related to the parameters of the transmission line or the derivation process itself.

Who May Find This Useful

Participants interested in electrical engineering, specifically in power transmission systems and circuit modeling, may find this discussion relevant.

MissP.25_5
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Hello.
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?
 

Attachments

  • image-26-05-14-11-42.jpeg
    image-26-05-14-11-42.jpeg
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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.
 
NascentOxygen said:
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.

Oh, yes! That's right, the Pi network is the solution! I just solved it, thanks to you!
 
MissP.25_5 said:
Oh, yes! That's right, the Pi network is the solution! I just solved it ...
Glad it worked! http://imageshack.com/a/img593/2259/girlpower.gif
 
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