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High current lightning strikes into earthing systems can result in ionization in the soil surrounding the earthing electrode. Most of the published studies investigating this phenomenon have assumed uniform one-layer soil, but soil ionization propagation in a multilayered soil sample has not been extensively addressed. Practical soils may consist of several layers with different water contents, and...
In this work, the results of an experimental study of the impulse characteristic of practical ground electrodes consisting of horizontal conductors of various lengths, a grounding grid and full-scale tower footings are reported. These electrodes are installed at an outdoor test site having nonuniform soil, with equipment facilities for generating low- and high-magnitude impulse currents. The tests...
In this paper, the behaviour of a horizontal electrode under impulse conditions is investigated experimentally at the Cardiff University outdoor earthing test facility. The test electrode consists of 88.5 m long copper conductor buried to a depth of 30 cm, and is divided into sections with test pits located along the electrode to enable access for voltage and current measurements along its length...
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