Optimal Analysis of Grounding System Design for Distribution Substation

Authors: T. Lantharthong, N. Rugthaicharoencheep, A. Phayomhom

Abstract:

This paper presents the electrical effect of two neighboring distribution substation during the construction phase. The size of auxiliary grounding grid have an effect on entire grounding system. The bigger the size of auxiliary grounding grid, the lower the GPR and maximum touch voltage, with the exception that when the two grids are unconnected, i.e. the bigger the size of auxiliary grounding grid, the higher the maximum step voltage. The results in this paper could be served as design guideline of grounding system, and perhaps remedy of some troublesome grounding grids in power distribution’s system. Modeling and simulation is carried out on the Current Distribution Electromagnetic interference Grounding and Soil structure (CDEGS) program. The simulation results exhibit the design and analysis of power system grounding and perhaps could be set as a standard in grounding system design and modification in distribution substations.

Keywords: Grounding System, Touch Voltage, Step Voltage, Safety Criteria.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1094739

References:

[1] A. Phayomhom, and et.al., "Safety analysis for grounding potential rise of two neighbouring substations: case study of metropolitan electricity Authority’s System. In Proce. 44th International Council on Large Electric Systems (CIGRE), Paris, France, August 2012.
[2] IEEE Std 80-2000, "IEEE guide for safety in AC substation grounding,” 2000.
[3] ANSI/IEEE Std 81-1983, "IEEE Guide for Measuring Earth Resistivity, Ground Impedance, and Earth Surface Potentials of a Ground System,” 1983.
[4] A. Phayomhom, and et.al., "Safety design planning of ground grid for outdoor substation in MEA’s power distribution system,” in Proc. Electrical Engineering/Electronics Computer Telecom. and Information Technology International Conf.. pp. 298-302, 2010.
[5] P. A. Zotos, "Ground grid design in large industrial plants,” IEEE Trans. Industry Applications, vol. 24, no. 3, pp.521-525, May/June, 1988.
[6] IEEE Std 367-1996, "IEEE recommended practice for determining the electric power station ground potential rise and induced voltage from a power fault,” 1996.
[7] M. Mitolo, P. E. Sutherland and R. Natarajan, "Effects of High Fault Currents on Ground Grid Design,” IEEE Trans. Industry Applications, vol. 46, no. 3,May/June, 2010
[8] A. Puttarach, et.al., "Substation grounding grid Analysis with the Variation of Soil layer depth Method,” in Proc. IEEE Conf. Lausanne, Power Tech. pp. 1881-1886, 2007.
[9] H. M. Khodr, et. al., "Design of grounding systems in substations using a mixed-integerlinear programming formulation,” Electric Power Systems Research, vol. 79, pp. 126–133, 2007.
[10] J. He, and et.al., "Seasonal influences on safety of substation grounding system,” IEEE Trans. on Power Delivery, vol. 18, no. 3, July 2003.