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A great proportion of the extended electricity distribution network (20/0.4 kV) failures in Greece can be considered as lightning related. This paper examines the overvoltage surges, affecting crucial elements of the distribution system of Patras, Greece. Two scenarios were discussed. The first suggests that, the medium and low-voltage networks share the same grounding system and the second that,...
A penetrating X-ray imaging technology is applied to study the soil ionization under surge current, by which grayscale images are obtained. Based on soil breakdown mechanism, there are series of discharge channels generating in the soil. By comparing the discharge time and imaging time, the filamentary paths, which can be directly observed in these grayscale images, are determined to be discharge...
The focus of this study is to analyze the performance of a distribution line struck by direct lightning in a particular point of its length. In this paper the analysis is based on the flashover and backflashover calculation due to lightning using the Alternative Transients Program — ATP. Parametric studies using this software are also performed to determine the sensitivity of the flashover and backflashover...
Earthing is the foundation of lightning protection of the RBS (radio base station), providing a way for discharging the lightning current. Equipotential bonding can protect equipment from lightning attack, providing a potential reference point for all equipment. There are two methods for the equipotential bonding. The first is the constant bonding, that is, equipment are grounded directly through...
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