An optimized transmission line model of grounding electrodes under lightning currents

• Published in: Science China. Technological sciences 2013-02, Vol.56 (2), p.335-341
• Main Authors: Yang, Lin, Wu, GuangNing, Cao, XiaoBin
• Format: Article
• Language: English
• Subjects: Conductors (devices); Electrodes; Engineering; Grounding; Lightning; Mathematical models; OTL; Segments; Transient potential; Transmission lines; 优化模型; 传输线模型; 分割导体; 接地电极; 有效长度; 瞬态行为; 雷电流
• ISSN: 1674-7321; 1869-1900
• DOI: 10.1007/s11431-012-5072-6

In this paper, an optimized transmission line model （OTL） for modeling transient behavior of grounding electrodes under lightning currents is presented. The soil ionization effect is considered in OTL, and all electromagnetic couplings between dif- ferent parts of grounding electrode are also considered by selecting the size of segment conductor properly and calculating the mutual coupling parameters between segment conductors accurately. Comparing with the traditional transmission line model, the optimized model can be used to accurately predict the effective length and transient potential rise （TPR） of grounding elec- trodes. Transient behaviors of grounding electrodes are simulated by OTL and the results are in good agreement with those of the electromagnetic model proposed by Grcev, and experiment results performed by Electricit6 de France and Geri. Further- more, non-uniform discharging phenomenon of grounding electrode under lightning current is discussed, and the effective lengths of horizontal grounding electrode under lightning currents are presented.