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Effect of earth grid conductor spacing on the safety criteria of substation earthing


Citation

Buba, Sani Dahiru and Wan Ahmad, Wan Fatinhamamah and Ab. Kadir, Mohd. Zainal Abidin and Gomes, Chandima and Jasni, Jasronita and Osman, M. (2014) Effect of earth grid conductor spacing on the safety criteria of substation earthing. In: 2014 IEEE International Conference on Power and Energy (PECon), 1-3 Dec. 2014, Kuching, Sarawak. (pp. 134-139).

Abstract / Synopsis

Site dependent parameters such as soil resistivity, maximum grid current, fault duration, shock duration, surface layer material resistivity, and grid geometry have substantial impact on the design and performance of an earth grid. The grid geometry, i.e. the area occupied by the grid system, conductor spacing and the depth of burial of earth grid specifically have much impact on the mesh, step, touch voltage and earth potential rise, while parameters such as the conductor diameter and the thickness of the surfacing material have less impact on the safety criteria. In this paper, a distribution substation earth grid was designed using the CDEGS software by varying the spacing between grid conductors (compression ratio) from 1 to 0.5 in steps of 0.1. The safety criteria were studied under three scenarios, without surface layer material, with surface layer material of resistivity 3000Ω-m, and surface layer material of resistivity 5000Ω-m. Results indicated that the grid resistance and earth potential rise were lower for a compression ratio 0.9, while the step and touch voltages were found to be similar for each case of surface layer material.


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Additional Metadata

Item Type: Conference or Workshop Item (Paper)
Divisions: Faculty of Engineering
DOI Number: https://doi.org/10.1109/PECON.2014.7062428
Publisher: IEEE (IEEE Xplore)
Keywords: Conductor spacing; Safety criteria; Earth grid; Substation earthing
Depositing User: Nursyafinaz Mohd Noh
Date Deposited: 03 Aug 2015 14:54
Last Modified: 03 Aug 2015 14:54
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1109/PECON.2014.7062428
URI: http://psasir.upm.edu.my/id/eprint/39725
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