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Assessment of the Grid Safety Values for Substation Grounding Grid Design Parameters in Vertical Two-Layer Soil Structure

Navinesshani Permal, Miszaina Osman, Azrul Mohd Ariffin and Mohd Zainal Abidin Ab Kadir

Pertanika Journal of Science & Technology, Volume 30, Issue 3, July 2022

DOI: https://doi.org/10.47836/pjst.30.3.03

Keywords: Grounding behavior, horizontal soil layers, substation, tropical climate, vertical soil layers

Published on: 25 May 2022

Typically, the impact of the structure of vertically layered soil on the grounding behavior is not considered while designing a substation grounding system. Therefore, it will result in poor grounding designs due to computed inaccurate grid safety values. Besides, no comparative analysis of the grounding design parameters’ impact on the grounding grid systems’ behavior and protection level between vertical and horizontal two-layer soil structures is presently available. Computing and analyzing the grounding behavior of apparent soil resistivity installed in a vertical two-layer soil structure is more challenging than in a horizontal two-layer soil. There are many other parameters to consider, such as the distance ‘a’ between the test electrodes and the angle ‘β’ between the perpendicular line to the soil boundary and the location of the test electrodes. One of the important findings of the assessment shows that the influence of vertically layered soil on grid impedance, step, and touch voltages of a grounding system is insignificant compared to a homogeneous and horizontally layered soil structure. The current flow is affected by an entire grounding grid placed in a specified layer of soil with a specific resistivity for horizontally layered soil. In contrast, soil boundaries separate a grounding grid with various resistivities for vertically layered soil. The outcome of this work is crucial in helping the engineers to understand the behavior of grounding systems in diverse soil conditions and tropical climates.

  • Anggoro, B., Dharmawanwas, R. H., Ningrum, H. N. K., Burhan, J., & Tamjis, M. R. (2018). Grounding impedance characteristics for two-layer soil of vertical rod configuration with variation of length and diameter. International Journal on Electrical Engineering and Informatics, 10(4), 799-815. https://doi.org/10.15676/ijeei.2018.10.4.12

  • Arnautovski-Toseva, V., Grcev, L., & El Khamlichi Drissi, K. (2007). High frequency electromagnetic analysis of horizontal grounding conductor and near-by passive parallel conductor within two-layer soil. In 2007 15th International Conference on Software, Telecommunications and Computer Networks (pp. 111-115). IEEE Publishing. https://doi.org/10.1109/SOFTCOM.2007.4446077

  • Asset Management Department. (2012). Substation design manual. Tenaga Nasional Berhad. https://pdfcoffee.com/substation-design-manualpdf-pdf-free.html

  • Coelho, R. R. A., Pereira, A. E. C., & Neto, L. M. (2018). A high-performance multilayer earth parameter estimation rooted in Chebyshev polynomials. IEEE Transactions on Power Delivery, 33(3), 1054-1061. https://doi.org/10.1109/TPWRD.2017.2664738

  • de Araujo, A. R. J., Colqui, J. S. L., Seixas, C. M., Kurokawa, S., Salarieh, B., Filho, J. P., & Kordi, B. (2019). Computing tower- footing grounding impedance and GPR curves of grounding electrodes buried in multilayer soils. In International Symposium on Lightning Protection (XIV SIPDA) (pp. 1-8). IEEE Publishing. https://doi.org/10.1109/SIPDA47030.2019.8951559

  • Gouda, O. E., El-Saied, T., Salem, W. A. A., & Khater, A. M. A. (2019). Evaluations of the apparent soil resistivity and the reflection factor effects on the grounding grid performance in three-layer soils. IET Science, Measurement and Technology, 13(4), 469-477. https://doi.org/10.1049/iet-smt.2018.5336

  • Gursu, B., & Cevdet, M. (2019). Limiting GPR in a two-layer soil model via genetic algorithms Limiting GPR in a two-layer soil model via genetic algorithms. Journal of the Franklin Institute, 346(8), 768-783. https://doi.org/10.1016/j.jfranklin.2009.07.003

  • He, J., Zeng, R., & Zhang, B. (2013). Methodology and technology for power system grounding. John Wiley & Sons. https://doi.org/10.1002/9781118255001

  • IEEE 80 (2013). IEEE guide for safety in AC substation grounding Std 80-2013. IEEE Power and Energy Society. https://standards.ieee.org/ieee/80/4089/

  • Ma, J., & Dawalibi, F. P. (2009). Computerized analysis of grounding plates in multilayer soils. IEEE Transactions on Power Delivery, 24(2), 650-655. https://doi.org/10.1109/TPWRD.2008.2005887

  • Mokhtari, M., Abdul-Malek, Z., & Gharehpetian, G. B. (2016). A critical review on soil ionisation modelling for grounding electrodes. Archives of Electrical Engineering, 65(3), 449-461. https://doi.org/10.1515/aee-2016-0033

  • Mokhtari, M., Abdul-Malek, Z., & Wooi, C. L. (2016). Integration of frequency dependent soil electrical properties in grounding electrode circuit model. International Journal of Electrical and Computer Engineering, 6(2), 792-799. https://doi.org/10.11591/ijece.v6i1.9527

  • Moradi, M. (2020). Analysis of transient performance of grounding system considering frequency-dependent soil parameters and ionization. IEEE Transactions on Electromagnetic Compatibility, 62(3), 785-797.

  • Nahman, J., & Paunovic, I. (2006). Resistance to earth of earthing grids buried in multi-layer soil. Electrical Engineering, 88(4), 281-287. https://doi.org/10.1007/s00202-004-0282-y

  • Nassereddine, M., Rizk, J., Nagrial, M., & Hellany, A. (2010). Estimation of apparent soil resistivity for two-layer soil structure. International Journal of Energy and Environment, 1(3), 427-446.

  • Nayel, M. (2014). Study apparent grounding resistivity in vertical-layer soil. Electric Power Components and Systems, 42(8), 845-851. https://doi.org/10.1080/15325008.2014.896432

  • Nayel, M., Lu, B., Tian, Y., & Zhao, Y. (2012). Study of soil resistivity measurements in vertical two-layer soil model. In 2012 Asia-Pacific Power and Energy Engineering Conference (pp. 1-5). IEEE Publishing. https://doi.org/10.1109/APPEEC.2012.6307337

  • Nikolovski, S., Knežević, G., & Baus, Z. (2016). Assessment of step and touch voltages for different multilayer soil models of complex grounding grid. International Journal of Electrical and Computer Engineering, 6(4), 1441-1455. https://doi.org/10.11591/ijece.v6i4.10637

  • Pavel, S. G., Maier, V., Ciorca, C., Beleiu, H. G., & Birou, I. (2020). Optimal design of the vertical earthing with electrodes arranged in line. Applied Sciences, 10(3), 5-8. https://doi.org/10.3390/app10031177

  • Permal, N., Osman, M., Ariffin, A. M., & Kadir, M. Z. A. A. (2021). The impact of substation grounding grid design parameters in non-homogenous soil to the grid safety threshold parameters. IEEE Access, 9, 37497-37509. https://doi.org/10.1109/ACCESS.2021.3063018

  • Sing, L. K., Yahaya, N., Othman, S. R., Fariza, S. N., & Noor, N. M. (2013). The relationship between soil resistivity and corrosion growth in tropical region. Journal of Corrosion Science and Engineering, 16, 1-11.

  • Takahashi, T., & Kawase, T. (1990). Analysis of apparent resistivity in a multi-layer earth structure. IEEE International Transactions on Power Delivery, 5(2), 604-612. https://doi.org/10.1109/61.53062

  • TNB. (2019). Electricity supply application handbook (Version 3.1). Tenaga Nasional Berhad. https://www.mytnb.com.my/themes/user/mytnb/pdf/2020_ESAH_Complete_v3.1.pdf

  • Tong, X., Dong, X., & Tan, B. (2019). High current field test of impulse transient characteristics of substation grounding grid. The Journal of Engineering, 2019(16), 2018-2021. https://doi.org/10.1049/joe.2018.8826

  • Tung, C. C., & Lim, S. C. (2017). Performance of electrical grounding system in soil at low moisture content condition at various compression levels. Journal of Engineering Science and Technology, 12(Special Issue 1), 27-47.

  • Unde, M. G., & Kushare, B. E. (2012). Grounding grid performance of substation in two layer soil - A parametric analysis. International Journal of Engineering Science and Emerging Technologies, 1(2), 69-76. https://doi.org/10.7323/ijeset/v1

  • Vyas, K. A., & Jamnani, J. G. (2012). Optimal design of grounding system for HV/EHV substations in two layered soil. International Journal of Emerging Technology and Advanced Engineering, 2(5), 383-392.

  • Vycital, V., Topolanek, D., Toman, P., & Ptacek, M. (2017). Sensitivity analysis of earthing system impedance for single and multilayered soil. CIRED - Open Access Proceedings Journal, 2017(1), 428-431. https://doi.org/10.1049/oap-cired.2017.1108

  • Yang, J., & Zou, J. (2020). Parameter estimation of a horizontally multilayered soil with a fast evaluation of the apparent resistivity and its derivatives. IEEE Access, 8, 52652-52662. https://doi.org/10.1109/ACCESS.2020.2980875

  • Zaini, H. G., & Ghoneim, S. S. (2012). Earth surface potential and grounding resistance for grounding grid in two-layer model soil. In 2012 IEEE International Conference on Power System Technology (POWERCON) (pp. 1-5). IEEE Publishing. https://doi.org/10.1109/PowerCon.2012.6401396

ISSN 0128-7680

e-ISSN 2231-8526

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