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The impact of the frequency dependence of soil electrical parameters on the lightning response of a typical grounding arrangement of wind-turbine systems is assessed, based on experimental and simulated results. It was found that the frequency dependence of soil parameters is responsible for decreasing the grounding potential rise of grounding system and, thus, its impulse impedance and its impulse...
This paper presents the application of transmission line theory to analyze grounding arrangements composed of multiple parallel electrodes. The grounding system is treated as a multiconductor transmission line and a solution method based on a similarity transformation is used to solve the resultant equations. The impulse response of grounding arrangements composed of multiple grounding rods and horizontal...
This work asses the shielding failure of transmission lines by applying the Electrogeometric Model, notably considering the influence of both first and subsequent strokes and also channel angles different from 0° (vertical channel). Considering different tower geometries, it is shown that the shielding failure rate of transmission lines is much more significant for subsequent strokes than for first...
Lightning Location Systems (LLS) data are important source to characterize lightning incidence considering extensive regions and allowing different analysis related to power system performance and protection actions against lightning incidence on transmission lines and distribution routes. After a recent upgrade of LLS central processor in Minas Gerais State, a performance analysis was done. The authors...
The peak currents of seven first and ten subsequent strokes measured at the instrumented tower of Morro do Cachimbo Station and estimated by the Brazilian lightning location system were compared. The evaluation shows a trend of the LLS to underestimate the amplitudes of currents. The mean ratio between the measured and the estimated peak currents exceeds 1.4 for first strokes and 1.7 for subsequent...
This work presents fundamental aspects of a computational tool the authors developed for application in voltage sag analysis in the expansion planning activities. This tool introduces the use of lightning-location-system data to perform analyses of voltage-sag severity along the power system and to identify critical spots responsible for the system vulnerabilities. A case study is presented.
The peak currents of first strokes measured in the instrumented tower of Morro do Cachimbo Station and estimated by the Brazilian Lightning Location System are compared. Though the number of events is reduced, seven first strokes, the evaluation shows a trend of the LLS to underestimate the amplitudes of first-stroke currents. The mean ratio between the measured and estimated peak-currents exceeds...
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