Transient lightning response of grounding grid buried in multilayered earth model based on dynamic sate complex image method in time domain

A novel mathematical model has been developed in this paper, which can be used for accurately computing the lightning current flowing along the high voltage a.c. substations' grounding grid buried in multilayered earth model. To accelerate the calculation, dynamic state complex image method and closed form of Green's function in time domain were introduced into this model. The model can be used for study performance of transient lightning response to grounding grid.