Effects of Various Earth Grid Configurations on Ground Potential Rise Caused by Lightning Strike
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Abstract
Ground Potential Rise (GPR) caused by lightning strike is a potential hazard for electrical equipment inside an oil and gas refinery plant. In order to mitigate the risk, horizontal grounding grid is applied. The best mitigation is to install a grounding grid with mesh size as small as possible. This condition requires a high cost. In order to obtain the optimal mesh size, a series of simulation of a grounding grid with mesh size variations on GPR caused by lightning strike has been carried out. CDEGS software was used to observe the GPR with various mesh size from 6.5 x 6.5 m to 20 x 20 m. Simulation results show that the maximum transient GPR rises as the grounding grid mesh size is increased, while the GPR distribution throughout the grounding grid area does not change much for different mesh sizes. In the other hand, decreasing the grid size would mean that more conductors are required, hence the cost would increase accordingly. The result shows that grid sizes from 6.5 x 6.5 m up to 20 x 20 m have no significant difference in term of GPR. In term of cost, 10 x 10 m does not show significant difference with 20 x 20 m, on the other hand, there is a significant difference for grid sizes 1 x 1 m to 10 x 10 m. From the results, grid sizes between 10 x 10 m up to 20 x 20 m are still applicable as stated in Petronas Technical. To comply with proper GPR value, additional protection devices are needed to protect the electrical equipment from potential damage.
Manuscript received: 1 Nov 2018 | Accepted: 23 April 2019 | Published: 13 Nov 2019
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References
J. Liu, L. Cheng, and Z. Qi, “Impact of secondary effect of earth potential rise caused by lightning strike on lightning introduction port in base station,” IEEE 2014 International Conference on Lightning Protection (ICLP), Oct 11, 2014, pp. 188-191.
P. H. Pretorius, “On ground potential rise presented by small and large earth electrodes under lightning conditions,” IEEE AFRICON, Sep 18, 2017, pp. 1055-1060.
D. Haluza, “Lightning, ground potential rise, and electrical damage; protecting wayside equipment on the MTA Long Island Rail Road,” Proceedings of the 1996 ASME/IEEE Joint Railroad Conference, Apr 30, 1996, pp. 111-135.
S. Zhen, W. Jianguo, Q. Xiushu, X. Nianwen, F. Chunhua, and C. Junjie, “Observation of lightning current and ground potential rise in artificially trigged lightning experiment,” IEEE International Conference on High Voltage Engineering and Application, Nov 9, 2008, pp. 277-280.
J. Yang, J. G. Wang, Y. Zhao, Q. L. Zhang, T. Yuan, Y. J. Zhou, and G. L. Feng, “Observation of ground potential rise caused by artificially-triggered lightning,” IEEE 2010 Asia-Pacific International Symposium on Electromagnetic Compatibility, Apr 12, 2010, pp. 1297-1300.
T. Thanasaksiri, “Ground potential rise from lightning overvoltage in communication station,” IEEE 2008 5th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, vol. 2, May 14, 2008, pp. 905-908.
T. Chen, H. Liu, D. Hu, X. Liu, T. Xu, X. Yang, and L. Ji, “Shell circulating current and transient ground potential rise in 220 kV GIS,” The Journal of Engineering, no.13, 2017, pp. 2555-2558.
S. T. Sobral, J. A. Barbosa, J. V. Nunes, E. Chinelli, A. F. Netto, V. S. Costa, and J. H. Campos, “Ground potential rise characteristics of urban step-down substations fed by power cables-a practical example,” IEEE Transactions on Power Delivery, vol. 3, no. 4, Oct 1988, pp. 1564-1572.
X. Liu, X. Lv, X. Sun, T. Wang, S. Wang, P. Yu, Y. Pei, L. Ji, D. Hu, and H. Liu, “Research on 220kV GIS enclosure circulation and temporary ground potential rise,” IECON 2017-43rd Annual Conference of the IEEE Industrial Electronics Society, Oct 29, 2017, pp. 398-404.
C. H. Lee, C. N. Chang, and J. A. Jiang, “Evaluation of ground potential rises in a commercial building during a direct lightning stroke using CDEGS,” IEEE Transactions on Industry Applications, vol. 51, no. 6, Nov 2015, pp. 4882-4888.
C. Tian, Y. Zhang, L. Cai, J. Wang, S. Huang, and Y. Wang, “Lightning transient characteristics of a 500-kV substation grounding grid,” IEEE 2011 7th Asia-Pacific International Conference on Lightning, Nov 1, 2011, pp. 711-715.
W. Ruan, S. Fortin, F. P. Dawalibi, F. Grange, and S. Journet, “Transient ground potential rises at a nuclear fusion experimental power plant hit directly by a lightning strike,” IEEE 2011 7th Asia-Pacific International Conference on Lightning, Nov 1, 2011, pp. 192-197.
IEEE Standards Association, “IEEE Recommended Practice for Determining the Electric Power Station Ground Potential Rise and Induced Voltage from a Power Fault,” IEEE std 367-2012, 2012.
S. Sekioka, K. Mori, N. Fukazu, K. Aiba, and S. Okabe, “Study on simulation model of lightning strike to ground to calculate lightning overvoltages in residence,” IEEE Transactions on Power Delivery, vol. 25, no. 2, Apr 2010, pp. 970-978.
IEEE Standards Association, “IEEE Guide for Safety in AC Substation Grounding,” IEEE std 80-2000, 2000.
International Electrotechnical Commission, “Protection Against Lightning - Part 1: General Principles,” IEC std 62305-1:2011, 2011.
International Electrotechnical Commission, “Protection Against Lightning - Part 2: Risk Management,” IEC std 62305-2:2006, 2006.
International Electrotechnical Commission, “Protection Against Lightning - Part 3: Physical Damage to Structures and Life Hazard,” IEC std 62305-3:2011, 2011.
International Electrotechnical Commission, “Protection Against Lightning - Part 4: Electrical and Electronic Systems Within Structures,” IEC std 62305-4:2011, 2011.
J. He, B. Zhang, and R. Zeng, “Maximum limit of allowable ground potential rise of substation grounding system,” IEEE Transactions on Industry Applications, vol. 51, no. 6, Nov 2015, pp. 5010-5016.
R. Zeng, X. Gong, J. He, B. Zhang, and Y. Gao, “Lightning impulse performances of grounding grids for substations considering soil ionization,” IEEE Transactions on Power Delivery, vol. 23, no. 2, Apr 2008, pp. 667-675.
International Electrotechnical Commission, “Low-voltage surge protective devices - Part 11: Surge protective devices connected to low-voltage power systems - Requirements and test methods,” IEC std 61643-11:2011, 2011.