When a substation is struck by lightning, it will cause the ground potential to rise, which will further cause serious interference to the secondary cable. This article is based on the grounding grid established in the testing ground. The grounding copper bar is laid in the cable trench to connect with the grounding grid. At different grounding grid points, use a lighting current impulse generator to apply high current. At the same time, the grounding grid model is established by using the ATP-EMTP software. Through the combination of test and simulation, the influence of different lighting inflow locations on the protection effect of grounding copper bar is studied, and combined with the connection method of the grounding copper bar and the grounding grid, the protective effect of the grounding copper bar on the secondary cable under the impact of lightning current was analyzed. The research results showed that the laying of grounding copper bars can reduce the influence of interference voltage on the secondary cables under certain circumstances, but when there are multiple connection points between the grounding copper bar and the grounding grid, the current injection position is different, which will affect the voltage between the cable core and the shielding layer. At the same time, it will also affect the ground potential rise of cable grounding point in different degrees.
"Analysis of Lightning Interference and Protection Methods on Secondary Cables in Substation," Progress In Electromagnetics Research C,
Vol. 114, 31-41, 2021. doi:10.2528/PIERC21052701
1. He, J. L., B. Zhang, and R. Zhang, "Maximum limit of allowable ground potential rise of substation groundingsystem," IEEE Trans. Ind. Appl., Vol. 51, No. 6, 5010-5016, Dec. 2015. doi:10.1109/TIA.2015.2427121
2. Zhang, Z. H., W. D. Shi, P. Kang, and S. Lei, "Electromagnetic interference on secondary systems of UHVDC substation caused by ground potential rise," 2018 International Symposium on Electromagnetic Compatibility, 895-898, Aug. 2018. doi:10.1109/EMCEurope.2018.8485157
3. Zhang, H., Y. Han, Y. Ling, et al. "The forecast analysis in substation electromagnetic interference," Diangong Jishu Xuebao/Transactions of China Electrotechnical Society, Vol. 30, 412-417, 2015.
4. Mitolo, M., P. E. Sutherland, and R. Natarajan, "Effects of high fault currents on ground grid design," IEEE Trans. Industry Applications, Vol. 46, 1118-1124, May 2010. doi:10.1109/TIA.2010.2046297
5. Zhao, H., H. Griffiths, A. Haddad, and A. Ainsley, "Safety-limit curves for earthing system designs: Appraisal of standard recommendations," IEE Proc. --- Gener. Transm. Distrib., Vol. 152, 871-879, Nov. 2005. doi:10.1049/ip-gtd:20050007
6. Zhang, B., X. Cui, and M. L. Wu, "Analysis of the effect of a two-endgrounded cable on the performance of a large grounding grid," Switzerland: Proceedings of the 15th International Zurich Symposium & Technical Exhibition on EMC, 193-196, 2003.
7. Zhang, B., X. Cui, Z. B. Zhao, and J. L. He, "Numerical analysis of the influence between large grounding grids and two-end grounded cables by the moment method coupled with circuit equations," IEEE Trans. Power Delivery, Vol. 20, 731-737, Jun. 2005. doi:10.1109/TPWRD.2005.844303
8. Xiao, L. S., B. Zhang, Q. Li, and J. L. He, "Connection mode of distributed equipotential grounding grid and main grounding grid," High Voltage Engineering, Vol. 41, 4226-4232, 2015.
9. Zhang, B., J. L. He, and R. Zeng, "State of art and prospect of grounding technology in power system," High Voltage Engineering, Vol. 41, 2569-2582, 2015.
10. State Grid Corporation of China, State Grid Corporation of China Eighteen Majoranti Accident Measures (Trial Operatior), 40-46, 48–54, China Electric Power Press, Beijing, China, 2012.
11. Tang, X. B., "Laying of secondary equipotential grounding," Power System Technology, Vol. 58, 57-59, 2012.
12. Popov, M., L. Grcev, and L. Sluis, "An ATP-EMTP-based model for analysis of shielding properties of ferromagnetic cable sheaths," IEEE Transactions on Power Delivery, Vol. 20, 2241-2247, 2005. doi:10.1109/TPWRD.2004.843398
13. IEEE Guide on Shielding Practice for Low Voltage Cables, IEEE Std 1143-2012, , 3013.