NICORA M.

Scientific community is focusing on the effect of lightning activity on people safety and infrastructures security because of the dangerous consequences of this kind of phenomenon. Each study of safety and security associated to lightning flashes needs as input reliable data in terms of lightning activity related to the analyzed territory. In...

This work provides an approach for speeding up the evaluation of lightning ElectroMagnetic (EM) fields in the case of a finite soil conductivity. The soil conductivity is taken into account through the well-known Cooray-Rubinstein (CR) approximation, which corrects the radial term of the electric field. A comparative analysis with some of the...

Lightning is one of the most dangerous natural phenomena, able to produce high impacts and damage on human beings and infrastructures (civil, electric, telecommunications, etc.) even though perception of it as a hazard is low. The aim of this study is to provide a detailed analysis of lightning occurrence throughout the Italian territory to...

The lightning induced voltages in a transmission line need the knowledge of many parameters such as the peak current, the return stroke velocity, the front duration, the channel attenuation and distortion. Their variation affect the results in a non-predictable way and only one variation can cause a high computational cost in the computation...

Dealing with lightning performance computation, researchers usually consider only negative downward first return strokes and the relevant channel-base peak current distribution. The aim of this article is to account for the lightning flash mechanism, which means to include also downward negative subsequent strokes and downward positive strokes,...

This article proposes a method for the derivation of a formula that links the maximum lightning-induced-overvoltage occurring on an overhead distribution line with the variables that characterize the lightning return stroke, such as the peak current, front duration, and stroke location. The coefficients of such formulas are obtained thanks to a...

Nowadays the protection of overhead distribution lines from atmospheric events, such as lightning strikes, is crucial and represents one of the most discussed topic in the research on lightning. When we deal with distribution lines, the lightning performance, which involves both direct and indirect events, usually neglects the well-known corona...

This article presents the Lightning Performance (LP) assessment of a realistic portion of the Italian distribution network with the use of probability distributions for lightning parameters inferred from local data recorded by a Lightning Location System (LLS). The procedure considers downward negative first, negative subsequent, and positive...

Indirect lightning strokes represent and important source of damage for overhead distribution lines. For the correct evaluation of lightning-induced overvoltages, the frequency dependence of the electrical parameters of the soil should be considered. Therefore, this paper proposes a simplified approach which selects a dominant frequency...