Published Resources Details
Journal Article
- Title
- The heating of power cables
- In
- Journal of the Institution of Engineers, Australia
- Imprint
- vol. 11, no. 4, Apr 1939, pp. 123-132
- Description
This paper, No.658, originated in the Sydney Division of The Institution, and is an abstract of a paper entitled "The Heating of Power Cables, with Special Reference to Thermal Form Factor of Three-Phase Cables and to Single-Core Cables Carrying Three-Phase Power." The author, Reginald William John Mackay BSc ME AMIEAust, is Assistant Electrical Engineer, Department of Railways, Sydney, N.S.W.
See also Corrigenda J. v.15, n.6, Jun 1943, p.134.
[This paper was awarded the Electrical Association Premium 1939.]
- Abstract
In this paper a classification is given of the losses in electric power cables accompanied by an analysis of the problems of heat generation and dissipation. A method is described for the determination of the "form factor" or "geometric factor" of cable sections by means of measurements on enlarged scale models, by making use of the principle that the heat resistance of a particular cable section is analogous to the electrical resistance of the same section with a conductor substituted for the dielectric. Measurements were made of the alternating current resistance at 1,000 cycles per second of electrolytic model cable sections, by using an alternating current bridge arrangement giving a degree of accuracy of 1 part in 2,000. The external conditions affecting the heat dissipation are considered and by an analysis using the principle of super-position, leading to the determination of the heat flow equations for buried cables, a method is shown for the calculation of the losses in order that the temperature rise of the hottest cable sheath in a group may not exceed the maximum permissible value. An equation is given from which may be calculated the rating of any number of cables of any size, buried at any depth below the surface of the ground.