Published Resources Details
Journal Article
- Title
- Disconnection of long High Voltage transmission lines
- In
- Journal of the Institution of Engineers, Australia
- Imprint
- vol. 26, no. 7-8, Jul-Aug 1954, pp. 142-150
- Description
This paper, No.1144, originated in the Sydney Division of The Institution, and was submitted by the Division on 6 Jan 1954.
The author, J. A. Callow, ME BComm AMIEAust, is an Engineer in the System Design Branch, Electrical Division, of the Snowy Mountains Hydro-Electric Authority, Sydney.
[This paper was awarded the Electrical Engineering Prize 1954]
- Abstract
During field tests on the disconnection of long unloaded transmission lines, investigators have noted that the oscillograms obtained differ from those expected from a consideration of the classical theory of restrikes and voltage build-up. In this paper, the classical theory is recapitulated, and then several factors which may produce discrepancies are examined in detail.
It is shown that a very long line should be considered as having distributed, rather than lumped, parameters, and that the effect of a restrike is to cause a surge to travel along the line to the far end, where it will be reflected. For a typical case, the shape of the restrike surge is obtained, and consists of a short peak due to the capacitance of the source, followed by a relatively slow exponential increase in voltage, due to the inductance of the source.
While traversing the line, the surge is subjected to various modifying influences. It is shown that the greatest influence, corona, has the effect of limiting the voltage on the system to a constant value, independent of the number of restrikes. This value seems to be comparatively low, indicating that it may not be harder for a circuit breaker to disconnect a very long line than a somewhat shorter one.