Various measures for quantifying the transient response of simple grounding systems are proposed in this paper. In addition to the standard transient impedance concept the suggested measures arising from the circuit theory are instantaneous power, average power and total energy stored in the near field of a grounding electrode. The frequency response of the grounding electrode is obtained by using the antenna model (AM) while the associated transient response is computed using the Inverse Fourier Transform. The integro-differential realtionships arising from the wire antenna theory are numerically handled via the Galerkin-Bubnov scheme of the Indirect Boundary Element Method (GB-IBEM). A number of illustrative numerical results are presented in the paper.

This paper deals with a frequency domain analysis of a lightning rod using the antenna theory model. The lightning rod struck by lightning is represented by a straight thin wire antenna excited by an equivalent current source. The current induced along a lightning rod due to a direct lightning strike is determined by solving the homogeneous integro-differential equation of the Pocklington type. Once obtaining the current distribution along the rod provides the calculation of the charge induced along the rod and related irradiated electric field. The corresponding Pocklington equation and field integral relationships are handled via the Galerkin-Bubnov scheme of the Indirect Boundary Element Method (GB-IBEM).

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