volume | PIER Journals

Abstract

In plain areas, the majority of the ultra-high voltage(UHV) transmission corridors are located in farmland. The induced voltage is generated on the metal casing of the machinery when agricultural machines are working on the ground near the transmission line. If the human body touches, transient electric shock(TES) may occur, causing displeasure and alarm to workers. Therefore, it is crucial to study the induced electrical characteristics in such scenarios. In this article, the finite element method (FEM) was employed to establish a model integrating a 1000 kV transmission line, tractor, and human body, and the induced voltage of the tractor and human body under the transmission line was calculated. Subsequently, a TES model was developed to calculate the current when an electric shock occurs. Finally, an experimental system was constructed in the area beneath the 1000 kV UHV AC line to measure the current characteristics of the human body during the TES. The results demonstrate that the induced voltage is contingent upon the position of research object and whether it is insulated from the ground. Additionally, ground conditions significantly influence the TES current induced by the voltage. Due to the electromagnetic shielding effect of the tractor's metal casing, the TES current experienced by the driver inside the machine is minimized. For ground staff, when the human body is insulated from the ground, the transient electric shock current they bear is smaller than that of the human body grounded.

1. Shu, Yinbiao and Weijiang Chen, "Research and application of UHV power transmission in China," High Voltage, Vol. 3, No. 1, 1-13, 2018.

2. Liu, P., Y. Y. Guo, R. Lin, et al. "Equivalent electric field strength method used in corona test and optimization design of double-swinging protectors for UHVAC double circuit tension support," Transactions of China Electrotechnical Society, Vol. 37, No. 15, 3963-3972, 2022.

3. Li, X. B., H. T. Wu, L. Y. Cheng, et al. "Stochastic time domain calculation model for radio interference from DC conductor," Transactions of China Electrotechnical Society, Vol. 38, No. 6, 1531-1540, 2023.

4. Yue, G. H., Z. Y. Du, HWi Cai, et al. "Numerical simulation method of ion flow field in HVDC transmission line based on wind speed probability distribution and wind shear exponent," Transactions of China Electrotechnical Society, 1-9, 2023.

5. Zhang, J., B. Wan, Q. Cheng, et al. "An efficient and robust low-order iterative flux tracing method for calculating ion flow field of HVDC transmission lines," Transactions of China Electrotechnical Society, Vol. 37, No. 8, 1718-1725, 2021.

6. Deng, X. Q., Y. Zhang, and D. Wei, "Prediction and evaluation of electromagnetic environment impact of 1000 kV UHV transmission line," Energy and Energy Conservation, No. 4, 99-102, 2023.

7. Liang, L. H., L. F. Li, W. P. Fu, et al. "A study on the suppression method of transient electric shock under 1000 kV double-circuit AC transmission lines," Power System and Clean Energy, Vol. 38, No. 2, 35-41, 2022.

8. Zhao, Zhibin, Songzhao Dong, and Huichun Xie, "Distorted electric field of the building near UHVAC double circuit transmission lines on the same tower," High Voltage Engineering, Vol. 38, No. 9, 2171-2177, 2012.

9. Long, Q., S. H. Wang, P. H. Feng, et al. "Calculation of potential transfer current for equipotential live working of 1000 kV transmission line tension tower," High Voltage Apparatus, Vol. 60, No. 1, 63-70, 2024.

10. Deno, Don W., "Electrostatic effect induction formulae," IEEE Transactions on Power Apparatus and Systems, Vol. 94, No. 5, 1524-1536, 1975.

11. Lin, C.-J., H.-R. Chaung, and K.-M. Chen, "Steady-state and shock currents induced by ELF electric fields in a human body and a nearby vehicle," IEEE Transactions on Electromagnetic Compatibility, Vol. 32, No. 1, 59-65, 1990.

12. Luo, Guang-Xiao, Ke Huang, and David Pommerenke, "Circuit-aided dummy design for human body-worn ESD application," IEEE Transactions on Electromagnetic Compatibility, Vol. 64, No. 6, 1820-1828, 2022.

13. Gunatilake, A., S. M. Rowland, Z. D. Wang, and N. L. Allen, "Modelling and management of microshocks under high voltage transmission lines," Proceedings of the Fifty-First IEEE Holm Conference on Electrical Contacts, 2005, 63-68, Chicago, IL, USA, 2005.

14. Gunatilake, Aruna, Yasir Ahmed, and Simon M. Rowland, "Modelling of microshocks associated with high-voltage equipment," IEEE Transactions on Power Delivery, Vol. 24, No. 1, 202-207, 2009.

15. Wang, Donglai, Tiebing Lu, Xueshan Li, Bo Chen, Xuebao Li, Li Xie, and Yong Ju, "Simulation and analysis of human body micro-shocks in the ion flow field near HVDC transmission lines," Journal of Electrostatics, Vol. 93, 10-16, 2018.

16. Li, S. Y., "The effect of electric field and personal feeling under ±500kV HVDC transmission line," Power System Technology, Vol. 15, No. 1, 25-31, 1991.

17. Wang, R. R., J. Xu, Z. Y. Li, X. L. Liu, F. Ma, and A. R. Hu, "Simulation analysis for induced voltage and induced current in the steel frame construction under UHV AC transmission lines," High Voltage Engineering, Vol. 47, No. 2, 724-731, 2021.

18. Wang, Qingyu, Xi Yang, Jintao Liao, H. Wang, H. Wu, and Z. Peng, "Evaluation of human exposure to power frequency electric fields induced by UHV substation," Proceedings of the CSEE, Vol. 34, No. 24, 4187-4194, 2014.

19. Cao, W. Q., J. W. Hu, and J. Lin, "Research of induction phenomenon of high voltage transmission line," Electric Power Technology and Environmental Protection, Vol. 31, No. 5, 4-5, 2015.

20. Zhu, W. Y., "Discussion on human body impedance analog circuit of leakage current tester," Electronic Product Reliability and Environmental Testing, Vol. 37, No. 5, 77-80, 2019.

21. Li, C. G., M. Tian, and Y. Zhao, "The analysis of human body electrostatic discharge model and the parameter of human body electrostatic eliminator," Safety Health & Environment, Vol. 15, No. 8, 17-20, 2015.

22. Ye, W. W., "Application of the simulation analysis in the electrostastic discharge model," China Association for Science and Technology Annual Conference --- Proceedings of High-level Forum on Communication and Information Development, 530-535, Wuhan, China, 2007.

23. Sǎlceanu, A., Oana Neacşu, V. David, and E. Luncă, "Measurements upon human body capacitance: Theory and experimental setup," 15th IMEKO TC4 International Symposium on Novelties in Electrical Measurements and Instrumentation, 48-51, Iasi, Romania, 2007.

24. Liu, Yongxin, "The theoretical conversion of test data from a nonstandard human body model," Journal of Test and Measurement Technology, Vol. 14, No. 2, 113-116, 2000.

25. De Santis, Valerio, Valeiy Martynyuk, Alessandro Lampasi, Mykola Fedula, and Manuel Duarte Ortigueira, "Fractional-order circuit models of the human body impedance for compliance tests against contact currents," AEU --- International Journal of Electronics and Communications, Vol. 78, 238-244, 2017.

26. He, Wangling, Yinlu Zhang, Yunpeng Liu, Qiyu Chen, Xiao Han, Dasen Zhou, Hongyu Wei, and Baoquan Wan, "Experimental study on the transient electric shock characteristics between metal sheds and the human body near ultrahigh voltage alternating current transmission lines," IEEE Transactions on Electromagnetic Compatibility, Vol. 65, No. 3, 679-688, 2023.

Dr. Bin Hu

Dr. Meng Zhang

Dr. Xiaohe Zhao

Dr. Bingchen Hou

Dr. Zhongqing He