What are the different types of capacitance in a system of conductors and Earth?

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Discussion Overview

The discussion revolves around the definitions and distinctions between various types of capacitance in systems involving conductors and Earth, specifically focusing on partial capacitance, mutual capacitance, self capacitance, and earth capacitance. Participants seek clarity on these engineering terms, including references to literature that may provide illustrations or diagrams.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant requests resources that clearly define and illustrate the differences between partial capacitance, mutual capacitance, self capacitance, and earth capacitance.
  • Another participant suggests that the search term "Cable" + "capacitance" yields a large number of results, questioning the specific context of interest, such as power cables or signal transmission.
  • A participant mentions the value of Time Domain Reflectometry in their work, implying its relevance to capacitance measurements.
  • Links to external resources are provided, including a description of partial capacitance, but some participants express that these descriptions are insufficient for their understanding.
  • One participant describes a system of conductors and Earth, stating that there are six uniquely defined capacities in a linear dielectric medium, which includes three mutual capacities and three capacities to Earth, all referred to as "partial capacities."

Areas of Agreement / Disagreement

Participants express uncertainty regarding the term "partial capacitance," with some seeking clarification and others questioning the adequacy of existing definitions. There is no consensus on the definitions or the clarity of the concepts discussed.

Contextual Notes

Some participants note that the definitions and interpretations of capacitance types may depend on specific contexts or applications, and there are indications of unresolved mathematical or conceptual steps in understanding these terms.

learnABC
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Anybody please help to tell me if there's a book or journal that clearly describe the definition and differences ( best if it comes with illustration or diagram) between these engineering terms:
(1)partial capacitance
(2)mutual capacitance
(3)self capacitance
(4)earth capacitance
Thank you!
 
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"Cable" + "capacitance" yields a half million hits. Are you interested in power cables? Signal transmission/distribution? Instrumentation cables?
 
I found Time Domain Reflectometery very valuable in my work as reactor plant electrician.
 
learnABC said:
Anybody please help to tell me if there's a book or journal that clearly describe the definition and differences ( best if it comes with illustration or diagram) between these engineering terms:
(1)partial capacitance
(2)mutual capacitance
(3)self capacitance
(4)earth capacitance
Thank you!

What is "partial capacitance"? I haven't heard that term before...
 
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http://onlinelibrary.wiley.com/doi/10.1002/mop.21166/abstract

Keywords:
  • multiconductor systems;
  • capacitive coupling;
  • partial-capacitances
Abstract
In the analysis of electrostatic-field problems for multiconductor systems with n + 1 conducting bodies immersed in dielectric media, the capacitive coupling effects among conductors can be described by means of a partial-capacitance scheme consisting of a network of n(n + 1)/2 capacitors, each one linking each conductor pair. From a physical viewpoint, each capacitor is usually associated with the existence of lines of force of the displacement field vector D from one conductor to another. In this paper, we show that such a physical interpretation not only cannot be taken literally, but also, above all, can be a misleading one. If care is not taken, computation procedures based on D-field integration may lead to a wrong evaluation of the partial-capacitance scheme. For illustration purposes, a very simple example of a symmetric three-conductor system with odd-mode excitation is analyzed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 346–349, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21166

doesn't really make sense to me either, Berkeman
capacitance either exists or it doesn't and it has a value, small or large
 
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berkeman said:
What is "partial capacitance"? I haven't heard that term before...
Suppose a system of any number of finite size, galvanically separated conductors placed at some distances from each other and at some distances from "infinite" or very large conductor. That very large conductor can be Earth (earth's equipotential surface), and this situation for 3 conductors and Earth is illustrated in the following pic:

Cc72b8.png


Anylisis show that in electrostatic case there are 6 uniquelly defined capacities in linear dielectric medium. 3 mutual capacities between conductors (Cm) and 3 capacities of conductors to Earth (Ce). To my knowledge, each one of these 6 capacities is referred to as a "partial capacity".
 
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