Time-Domain Analysis of Faulted Vertical Grounding Electrode's Transient Resistance under Lightning Current
Deng Huido · Insulators and Surge Arresters · 2014
In order to study the impacts of faulted vertical grounding electrode on transient grounding resistance, the author uses thin-slot on the surface of the electrode condition and localized corrosion condition to simulate a faulted electrode. By finite-difference time-domain method, using Matlab program language, analyzes the transient grounding resistance changes at different fault types and different distances between trouble spots and the top of the vertical electrode. Through analysis of research, the transient resistances are larger than normal both a thin-slot on the surface of the vertical grounding electrode and the electrode suffered local corrosion. The distance between a trouble spot and the top of the vertical grounding electrode is inversely related to the change of transient resistance. The most visible change of transient grounding resistance is during the lighting current discharging process. The conclusion can provide theoretical basis and practical reference for the anti-lightning grounding design and the corrosion status of grounding electrode detection.