A simplified model of the lightning performance of a driven rod earth electrode in multi-layer soil that includes the effect of soil ionisation

Abstract

It is proposed that a single apparent resistivity value calculated from the steady state resistance equation and the measured steady state resistance can be used as a simplification for lightning current transient performance modelling of a driven rod earth electrode in multi-layer soil. The proposal is verified against results obtained using transient analysis of an equivalent circuit that includes the effect of soil ionisation and full-scale experimental results of current impulse tests on a single vertical earth rod in three-layer soil