IJBTT

Earth Mat Design for 132/33Kv Substation in Rivers State Using ETAP

	International Journal of Engineering Trends and Technology (IJETT)
	© 2014 by IJETT Journal
	Volume-15 Number-8
	Year of Publication : 2014
	Authors : C.S. Esobinenwu , B.O.H. Akinwole , C.O. Omeje
	10.14445/22315381/IJETT-V15P275

Citation 

C.S. Esobinenwu , B.O.H. Akinwole , C.O. Omeje. "Earth Mat Design for 132/33Kv Substation in Rivers State Using ETAP", International Journal of Engineering Trends and Technology (IJETT), V15(8),389-402 Sep 2014. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract

Earthing is an important aspect of every substation construction. Earth Mat is preferable to large substations because of space saving on the ground level due to substantial reduction of earth pits which leads to ease of coordination. Earth Mat minimizes the danger of high step or touch voltages in critical operating areas or places that are frequently used by people. Thus properly designed earthing system capable of dissipating large currents safely to earth is required, regardless of the fault type. This paper presents the design of earthing systems for the 132/33Kv substation in Rivers state of Nigeria and the review of substation practices with special reference to safety and development criteria for safe design. A real time case study has been considered and the design was done using ETAP (Electrical Transients Analyzer Program). Simulation using ETAP eradicates the error that is inherent in manual operational method that is mostly used in various substations.

References

[1] (2000) ANSI/IEEE Std.80, IEEE Guide for safety in AC Substation Earthing, New York,
[2] J.G. Sverak et al., Safe substation earthing, Part I: IEEE T. on Power Apparatus and Systems,100, 4281-4290, (1981); Part II: IEEE T. on Power Apparatus and Systems, 101, 4006-4023, (1982)
[3] F. Navarrina, I. Colominas, M. Casteleiro, Analytical Integration Techniques for Earthing Grid Computation by BEM, Num. Met. in Eng. and Appl. Sci., 1197–1206, CIMNE, Barcelona, (1992).
[4] I. Colominas, F. Navarrina, M. Casteleiro, A boundary element numerical approach for earthing grid computation, Comput. Methods Appl. Mech. Engrg., 174, 73-90, (1999).
[5] R.J. Heppe, Computation of potential at surface above an energized grid or other electrode, allowing for non-uniform current distribution, IEEE T. Power Apparatus and Systems, 98, 1978-1988, (1979).
[6] D.L. Garrett and J.G. Pruitt, Problems encountered with the Average Potential Method of analyzing substation earthing systems, IEEE T. on Power Apparatus and Systems, 104, 3586-3596, (1985).
[7] C. Mazett and G. M. Veca. “Impulse Behaviour of Earthing Electrodes”, IEEE Trans. Power App. Syst., Vol 102, no.6, PAS-9, 3148-3154, 1983.
[8] H.B. Dwight “Calculation of resistance to ground”. Electrical Engineering, pp 1319- 1328, December 1936.
[9] S. Ghosh, S. Munshi, and J.R. Biswas. “Computer aided analysis of surge behaviour of an earthing counterpoise discharging impulse current to ground,” Journal of the Institution of Engineers India, vol. 77, pp. 128-132, November,1996.
[10] A.S. Farag, T.C. Cheng, and D. Penn.“Earthing terminations of lightning protective systems”, IEEE Trans. Dielectics Elect. Insul. Vol.5 pp.869–877. 1998.

Keywords
Earth Mat, Step potential, touch potential, Earthing, ground resistance, electrodes, and simulations.