The analysis of EMC problems caused by transient current and voltage on grounding grids created by lightning surges is carried out in the present work. Although this problem is considered by Zago.F et al. [26] complete data on the variation of transient voltages as a function of time under different resistivity conditions is not available. Considering the TLM concept has reported by Zago.F computations are made to obtain the data on transient voltage variations. As the results presented in this work are very useful in solving lightning related EMC problems.
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