Safety Compliance of Substation Earthing Design

Authors: A. Hellany, M.Nagrial, M. Nassereddine, J. Rizk

Abstract:

As new challenges emerge in power electrical workplace safety, it is the responsibility of the systems designer to seek out new approaches and solutions that address them. Design decisions made today will impact cost, safety and serviceability of the installed systems for 40 or 50 years during the useful life for the owner. Studies have shown that this cost is an order of magnitude of 7 to 10 times the installed cost of the power distribution equipment. This paper reviews some aspects of earthing system design in power substation surrounded by residential houses. The electrical potential rise and split factors are discussed and a few recommendations are provided to achieve a safety voltage in the area beyond the boundary of the substation.

Keywords: EPR, Split Factor, Earthing Design

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1327961

References:

[1] IEEE guide to safety in AC substation grounding, 2000- (IEEE, New York, 2000).
[2] AS/NZS 4853:2000 electrical hazards on metallic pipelines
[3] Nassereddine M, Hellany A, Rizk J, 2009, How to design an effective earthing system to ensure the safety of the people, 2009 International Conference on Advances in Computational Tools for Engineering Applications, pp 416-421
[4] Nassereddine M, Hellany A, 2009, AC Interference Study on Pipeline: the Impact of the OHEW under Full Load and Fault Current, Proceeding in the 2009 International Conference on Computer and Electrical Engineering, pp 497-
[5] Nassereddine M, Hellany A, 2009, Designing a Lightning Protection System Using the Rolling Sphere Method, Proceeding in the 2009 International Conference on Computer and Electrical Engineering, pp 502-506
[6] Hellany A, Nassereddine M, Nagrial M, 2010, Analysis of the impact of the OHEW under full load and fault current, International Journal of Energy and Environment, vol 1, no. 4, pp 727-736
[7] Nassereddine M, Hellany A, 2010, OHEW Earthing Design Methodology of Traction Substation, World Academy of Science, Engineering and Technology. Proceedings, vol 1, no. 66, pp 1359- 1363,Paris, France ISSN 2070-3724
[8] Nassereddine M, Hellany A, 2010, Earthing Design Improvement: correlation between Design and Construction, World Academy of Science, Engineering and Technology. Proceedings, no. 66, pp 1364- 1367 Paris, France ISSN 2070-3724
[9] C.N. Chang, "computation of current-division factors and assessment of earth-grid safety at 161/69kV indoor-type and outdoor-type substations" IEE proc.-Gener. Transm. Distrib., Vol. 152, No. 6, November 2005.
[10] A. Campoccia, "A method to evaluate voltages to earth during an earth fault in an HV network in a system of interconnected earth electrodes of MV/LV substations" IEEE transactions on power delivery,Vol 23, No. 4, Oct 2008
[11] S. Mangione, "A simple method for evaluation ground fault current transfer at the transition station of a combined overhead-cable line", IEEE transaction on power delivery, Vol, 23, No, 3, July 2008
[12] E. Viel, "Fault current distribution in HV cable systems" IEE proc- Gener. Transmission distribution, Vol. 147, No. 4, July 2000
[13] F. Dawalibi, " Measurements and computations of fault current distribution on overhead transmission lines" IEEE on transactions on power apparatus and systems, Vol. PAS-103, No. 3, March 1984.