The Transient Performance of Power Systems

McGregor, John (1958) The Transient Performance of Power Systems. PhD thesis, University of Glasgow.

Abstract

This thesis is divided into two parts. In Part 1, an account is given of some measurements of the frequency and transient response of the elements of a 132 kV. power system, and a 440 V., 625 k.V.A. generator, with particular reference to their behaviour under recovery voltage and impulse conditions. In each case comparisons are made between the measured data and that calculated from the physical dimensions. These comparisons show that the equivalent circuits, used in recovery voltage analysis, are not valid when current chopping and impulse conditions are considered. It appears necessary then to Include the distributed nature of the parameters in the evaluation of the response. The difficulties In the selection of system parameters, and the uncertainty concerning the nature of the wave propagation led to the theoretical Investigation described In Part 2. In this, the effects of dispersion of the magnetic field at low frequencies, and the necessity of including the finite velocity of propagation at high frequencies, are examined for a cable with individual sheaths, a generator, and a transformer. The present theories are discussed, and, in each case, ideal structure representing the particular element are analysed as rigorously as possible, and the results compared with the experimental data. The propagation of waves along the cable is examined almost completely, and the results obtained compare favourably with the experimental data. The generator is studied by separating the various structural Influences on the propagation and studying each in turn. A similar procedure is used when dealing with the transformer: first the effects of the laminated core on the low frequency behaviour are determined, and then the high frequency behaviour is examined, considering the periodic nature of the coil and the effect of the source. The use of a sheath representing the coil is justified, and it is suggested that further analysis using this model would yield valuable results. In an appendix a description is given of Bergeron's graphical solution of one dimensional wave problems. It is indicated how this method may be extended to the solution of the three dimensional problem of a transient in a waveguide.

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Keywords: Electrical engineering
• Date of Award: 1958
• Depositing User: Enlighten Team
• Unique ID: glathesis:1958-79255
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 05 Mar 2020 11:13
• Last Modified: 05 Mar 2020 11:13
• URI: https://theses.gla.ac.uk/id/eprint/79255