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A new tool for calculation of lightning-induced voltages in power systems - Part II: Validation study
No full textin the companion paper (Part I), a new tool for lightning-induced voltage calculations, called CiLIV, has been presented. In this paper (Part II), predictions made with the new tool are compared to experimental data and to outputs of analytical procedures/numerical codes found in the literature
A new tool for calculation of lightning-induced voltages in power systems - Part I: Development of circuit model
No full textin this paper, we present a new tool for lightning-induced voltage calculations. The tool, a circuit model which can be integrated into power systems simulators, is based on the theory developed by Andreotti et al. (2001, 2009, 2013). In Part II, the accuracy, stability, and efficiency of the new tool are demonstrated via comparison with other solutions/codes found in the literature and with experimental dat
An analytical approach to calculation of lightning induced voltages on overhead lines in case of lossy ground - Part I: Model development
No full textAn analytical approach to calculation of lightning induced voltages on overhead lines in case of lossy ground - Part II: Comparison with other models
No full textOn the Effects of Channel Tortuosity in Lightning-Induced Voltages Assessment
No full textWe present a study on lightning-induced voltages on overhead lines produced by tortuous lightning channels, by using a recently developed tool called CiLIV (Andreotti et al. 2015). CiLIV, initially developed for straight and vertical channels, is here extended to account for tortuosity. High-resolution stereoscopic images of six triggered lightning channels have been 3-D digitized and used as input data for CiLIV. The result is that tortuosity, usually ignored in lightning-induced voltage assessment, can instead play a significant role: an attempt is made in characterizing and quantifying these effects. It is shown that, in contrast to other lightning parameters, like channel-base peak current, which are log-normally distributed and generate log-normally distributed induced voltages too, tortuosity generates normally distributed induced voltages. It is also shown that these voltages can deviate up to 23% (relative standard deviation) from the mean value
Statistical Analysis of Lightning-Induced Voltages in Case of Linearly Rising Channel-Base Currents and Lossy Ground
No full textThis paper proposes a statistical analysis of the lightning-induced voltages on overhead lines in case of lossy ground. The analysis, which assumes three random input variables, namely channel-base current peak value, front time, and line to strike distance, allows identifying parametric distributions able to describe the statistical behavior of the lightning-induced voltages; the lightning performance of the line is evaluated, too
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