# Capacitance of electric cable

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!

## Answers and Replies

Bystander
Homework Helper
Gold Member
"Cable" + "capacitance" yields a half million hits. Are you interested in power cables? Signal transmission/distribution? Instrumentation cables?

Doug Huffman
Gold Member
I found Time Domain Reflectometery very valuable in my work as reactor plant electrician.

berkeman
Mentor
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...

davenn
davenn
Gold Member
2021 Award
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

berkeman
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:

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".

berkeman