Search Results - "Visacro, Silvério"

An expeditious calculation approach to consider the influence of power frequency voltage on the calculation of the lightning performance of transmission lines: Validation for different peak current-front time correlation expressions and cumulative peak current distributions by Almeida, Frederico S., Silveira, Fernando H., Visacro, Silvério

“…•The quality of the 0.88-factor approach in comparison to Monte Carlo method is shown.•Analyses considered the correlation between peak current and front…”
Get full text

Stopping criterion for Monte Carlo method-based simulations of the lightning performance of transmission lines by Almeida, Frederico S., Silveira, Fernando H., Visacro, Silvério

Get full text

On the interpeak interval of unipolar pulses of current preceding the return stroke in negative CG lightning by Arcanjo, Marcelo, Guimarães, Miguel, Visacro, Silvério

“…•Unipolar pulses of current are induced along grounded structures by the steps of negative leader approaching the ground.•Statistics of amplitude and interpeak…”
Get full text

Influence of the current front time representation on the assessment of backflashover occurrence of transmission lines by deterministic and probabilistic calculation approaches by Silveira, Fernando H., Almeida, Frederico S., Visacro, Silvério, Zago, Giovanna M.P.

“…•The effect of the current front time representation on backflashover is shown.•Deterministic and probabilistic calculation approaches are adopted.•Front time…”
Get full text

A Comprehensive Approach to the Grounding Response to Lightning Currents by Visacro, S.

“…This paper is intended to present a comprehensive and objective approach to the behavior of grounding electrodes when subjected to lightning currents…”
Get full text

Portable Grounding Impedance Meter Based on DSP by Dias Rodrigues, Breno, Visacro, Silvério

“…A new grounding impedance measuring system based on digital signal processor (DSP) platform was developed. The low-cost portable device includes a built-in…”
Get full text

Updated statistics of lightning currents measured at Morro do Cachimbo Station by Visacro, Silvério, Mesquita, Claudia R., De Conti, Alberto, Silveira, Fernando H.

“…Parameters of current waveforms of several negative flashes measured recently at Morro do Cachimbo Station were considered in relation to the values provided…”
Get full text

On the role of transformer grounding and surge arresters on protecting loads from lightning-induced voltages in complex distribution networks by De Conti, Alberto, Silveira, Fernando H., Visacro, Silvério

“…•Lightning overvoltages on loads connected to complex LV networks are investigated.•Lightning-induced voltages and transferred lightning surges are both…”
Get full text

Lightning strikes to tall objects: A study of wave interactions at the return-stroke front using a nonlinear transmission line model by De Conti, Alberto, Silveira, Fernando H., Visacro, Silvério

“…A theoretical study is presented to investigate lightning strikes to towers, with focus on wave interactions occurring at the return‐stroke front due to the…”
Get full text

A study on the influence of corona on currents and electromagnetic fields predicted by a nonlinear lightning return-stroke model by De Conti, Alberto, Silveira, Fernando H., Visacro, Silvério

“…This paper investigates the influence of corona on currents and electromagnetic fields predicted by a return‐stroke model that represents the lightning channel…”
Get full text

Characterization of the effect of the insulating material of covered cables on the impulse breakdown behavior of single- and three-phase compact distribution lines by Souza, Ronaldo E., Silveira, Fernando H., Gomes, Rafael M., Lima, Guilherme S., De Conti, Alberto, Visacro, Silvério

“…•Larger withstand levels for HDPE covered cables are reported.•Differences up to 60% on minimum breakdown voltages are noted.•HDPE-covered cable presents…”
Get full text

A representative curve for lightning current waveshape of first negative stroke by Visacro, Silvério

“…A new approach is proposed for determining a representative lightning current waveshape for first negative strokes. This approach is applied to current wave…”
Get full text

Analysis of the impulse breakdown behavior of covered cables used in compact distribution lines by Souza, Ronaldo E., Gomes, Rafael M., Lima, Guilherme S., Silveira, Fernando H., De Conti, Alberto, Visacro, Silvério

“…•Tests applying standard lightning impulse voltages on compact distribution lines structures with covered cables are shown.•The impulse behavior of single- and…”
Get full text

A comparison of different approaches to simulate a nonlinear channel resistance in lightning return stroke models by De Conti, Alberto, Visacro, Silvério, Theethayi, Nelson, Cooray, Vernon

“…Different physical models that describe the time variation of the channel resistance are investigated in a lightning return stroke model. Such models consider…”
Get full text

Voltages Induced in Single-Phase Overhead Lines by First and Subsequent Negative Lightning Strokes: Influence of the Periodically Grounded Neutral Conductor and the Ground Resistivity by Silveira, Fernando H, De Conti, Alberto, Visacro, Silvério

“…The influence of a periodically grounded neutral conductor on voltages induced by first and subsequent negative strokes in single-phase overhead lines for…”
Get full text

On the use of lumped sources in a nonlinear lightning return stroke model and extension for evaluating strikes to tall objects by De Conti, Alberto, Visacro, Silvério

“…The use of lumped current and voltage sources is investigated in a nonlinear return stroke model that includes the dependence of the channel per‐unit‐length…”
Get full text

Close electric fields and lightning-induced voltages predicted by a return-stroke model including corona and nonlinear channel resistance by De Conti, Alberto, Silveira, Fernando H., Visacro, Silvério

“…•Induced voltages and electric fields are calculated with a nonlinear return-stroke model.•Nonlinear losses and corona lead to remote electric fields in…”
Get full text

Comparison of peak currents estimated by lightning location system and ground truth references obtained in Morro do Cachimbo station by de Mesquita, Cláudia R., Dias, Rosilene N., Visacro, Silvério

“…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…”
Get full text

Statistical analysis of lightning current parameters: Measurements at Morro do Cachimbo Station by Visacro, Silvério, Soares Jr, Amilton, Schroeder, Marco Aurélio O., Cherchiglia, Luiz C. L., de Sousa, Vander José

“…Most of the available data concerning lightning current parameters were obtained by means of measurements made in temperate regions in the Northern Hemisphere…”
Get full text

Lightning overvoltages on complex low-voltage distribution networks by De Conti, Alberto, Silveira, Fernando H., Visacro, Silvério

“…► Lightning overvoltages on complex LV networks are investigated. ► Lightning-induced voltages and transferred lightning surges are both studied. ► Inclusion…”
Get full text