Substation earthing
Substation earthing
Good substation earthing is essential for safe and reliable power systems. The main objective of this research is to study and develop a safe substation site, within not only the substation but also its immediate vicinity, with particular attention to the impedance of substation earthing mats and the distribution of the surface potentials. CDEGS MALT software package is used to model the earthing system, and the results obtained are analysed with other methods, namely the analytical model, numerical method, and experimental technique where applicable. CDEGS MALT software has a high reputation throughout the world. This has been verified in hundreds of technical papers published in the most reputed international journals to prove its reliability and accuracy. An electrolytic tank is also used throughout this research. Part of the initial study shows that the experimental results and the computational results compares very well with less than 1% difference in most cases. The computer software CDEGS MALT and the experimental tank are used to investigate some issues regarding substation earthing. The first issue investigated is regarding an earthing standard widely used in the UK, which is the S34, and some other common theoretical formulae relating to the resistance and surface potential of simple earthing systems. The second issue involves the resistance of an earthing disc with varying depth. The resistance and surface potential is greatly affected as the buried depth of the disc is changed. The next aspect is the effect of an insulating barrier to the earthing system. Using an insulating barrier can decrease the surface potentials in the vicinity outside the barrier significantly. However, this is at the expense of a slight increase in the resistance of the earthing system and an increase in surface potential between the grid and the barrier.
University of Southampton
Osman, Miszaina
84017dd2-a36e-4703-a08b-7d5fe7c65a19
2003
Osman, Miszaina
84017dd2-a36e-4703-a08b-7d5fe7c65a19
Osman, Miszaina
(2003)
Substation earthing.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Good substation earthing is essential for safe and reliable power systems. The main objective of this research is to study and develop a safe substation site, within not only the substation but also its immediate vicinity, with particular attention to the impedance of substation earthing mats and the distribution of the surface potentials. CDEGS MALT software package is used to model the earthing system, and the results obtained are analysed with other methods, namely the analytical model, numerical method, and experimental technique where applicable. CDEGS MALT software has a high reputation throughout the world. This has been verified in hundreds of technical papers published in the most reputed international journals to prove its reliability and accuracy. An electrolytic tank is also used throughout this research. Part of the initial study shows that the experimental results and the computational results compares very well with less than 1% difference in most cases. The computer software CDEGS MALT and the experimental tank are used to investigate some issues regarding substation earthing. The first issue investigated is regarding an earthing standard widely used in the UK, which is the S34, and some other common theoretical formulae relating to the resistance and surface potential of simple earthing systems. The second issue involves the resistance of an earthing disc with varying depth. The resistance and surface potential is greatly affected as the buried depth of the disc is changed. The next aspect is the effect of an insulating barrier to the earthing system. Using an insulating barrier can decrease the surface potentials in the vicinity outside the barrier significantly. However, this is at the expense of a slight increase in the resistance of the earthing system and an increase in surface potential between the grid and the barrier.
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Published date: 2003
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Local EPrints ID: 465183
URI: http://eprints.soton.ac.uk/id/eprint/465183
PURE UUID: c7fddfa3-cfe0-4041-9f53-3f5b3fcb3a6a
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Date deposited: 05 Jul 2022 00:28
Last modified: 16 Mar 2024 20:00
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Author:
Miszaina Osman
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