Calculation of capacitance of transmission lines

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Discussion Overview

The discussion revolves around the calculation of capacitance in transmission lines, particularly focusing on how to define and compute capacitance when dealing with multiple conductors and the ambiguity arising from differing charges on those conductors.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant defines capacitance between two plates as the charge per unit potential difference but questions how this applies to transmission lines with multiple conductors and differing charges.
  • Another participant suggests a resource link that may provide additional information on the topic.
  • A third participant expresses gratitude for the provided link.
  • A fourth participant recommends consulting an Engineering Electromagnetic textbook for detailed derivations of capacitance formulas for various types of transmission lines, noting the complexity of the material involved.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as participants express differing views on how to approach the calculation of capacitance in transmission lines, and no definitive answers are provided.

Contextual Notes

There is an acknowledgment of ambiguity in defining capacitance for transmission lines due to the unequal charges on conductors, which remains unresolved.

ajith.mk91
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Capacitance between two plates is defined as the charge accumulated per unit potential difference between those plates. But in the case of transmission lines how can we define it? The potential difference any two conductors in a group of several conductors can be derived in terms of the charges on individual wires. But how can we calculate the capacitance because there is an ambiguity in this case. The charges on both the conductors are not the same!
 
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Perhaps this link will help:
http://www.tup.com.cn/Resource/tsyz/030533-01.pdf
 
Last edited by a moderator:
Well, thank you
 
You can look in one of those Engineering Electromagnetic Text book. They have a section on capacitance of different transmission lines like parallel plates, coax, parallel lines etc. You can study how they derive the formulas also. Good book would be "Fiend and Wave Electromagnetics" by David K Cheng.

This is too long to write it out here, it is like 5 to 6 pages of textbook.
 

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