An improved model for soil ionization around grounding system and its application to stratified soil |
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| Affiliation: | 1. School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, PR China;2. Education Ministry Key Laboratory of Non-ferrous Materials Science and Engineering, Central South University, Changsha 410083, Hunan, PR China;1. Institute for Problems in Mechanics, Russian Academy of Sciences, Prospekt Vernadskogo, 101-1, Moscow 119526, Russia;2. Moscow Polytechnic University, Bolshaya Semenovskaya str., 38, Moscow 107023, Russia;1. LAMEL, University of Jijel, Algeria;2. FESB, University of Split, Croatia;3. Universite Blaise Pascal, France;1. Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Ruđera Boškovića 32, 21000 Split, Croatia;2. Pascal Institute, Blaise Pascal University, Clermont-Ferrand, France |
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| Abstract: | An improved model for taking into account the effect of the soil ionization around grounding system under lightning strike is proposed in this paper. In this model, the soil ionization region is assumed to retain 7% of its pre-ionization resistivity, which is consistent with the experimental results on soil ionization found in literature (Trans. SA Inst. Electr. Eng. (1988) 63; AIEE Trans. 61 (1942) 349; Proc. IEE 121(2) (1974) 123) and our own laboratory experiments (Time domain modelling of the response of grounding systems subjected to lightning currents, Licenciate Thesis, Uppsala University, 2003). Compared with modelling the soil ionization as an increase in the size of the ground conductor, the model presented here will not overestimate the beneficial influence of the soil ionization in reducing the ground potential rise, especially in high resistivity soil. The model is also applied to study the transient behaviour of grounding conductors in stratified soil under lightning strike including soil ionization. It shows that making the grounding conductor to penetrate the lower resistivity soil layer could help to decrease the ground potential rise at the injection point several times. |
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