High frequency and impulse earthing for surge arresters

Standards recognize that particular attention is required for the earthing of surge arresters which present locations for the passage of high frequency/transient currents. However, although good qualitative guidance is given in such standards, more detailed quantitative-based designs are required. This paper presents the results of simulations of surge arrester earthing systems with rod enhancements and quantifies their benefit in terms of reducing high frequency impedance and transient earth potential rise.