Abstract
The present work aims at developing a method--for the first time--for assessing the electric field around a charged conductor positioned in air (of zero conductivity) at a given height above a two-layer earth. The method is based on the complex successive imaging technique, being a quasi-static approximation for estimating the potential due to a line charge above the earth. With the knowledge of the image charges, the electric field values in air and earth are assessed. A laboratory transmission-line model and an electrolytic-tank model were constructed to simulate three-phase and single-phase transmission lines above a two-layer earth. The measured electric fields agreed reasonably with those calculated for one- and two-layer earth models. The calculation method is extended for assessing electric fields in power substations as influenced by earth modeling in one or two layers.
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