Transient Impedance Characteristics of Grounding Electrodes in Lightning Protection System

초록

This paper presents the transient impedance behaviors of grounding systems to lightning impulse currents. Also, the apparent soil resistivity at the test site was measured. The dynamic characteristics of the deeply driven ground rod and grounding grid subjected to the impulse current with various rise time were examined. It was found that the transient ground impedance characteristics strongly depend on the configuration and size of grounding electrodes and the impulse current shapes and the reduction of grounding electrode inductance is an important factor to improve the transient ground impedance characteristics.