Title :
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
Author :
Silveira, Fernando H. ; De Conti, Alberto ; Visacro, Silvério
Author_Institution :
Lightning Res. Center (LRC), Fed eral Univ. of Minas Gerais (UFMG), Belo Horizonte, Brazil
fDate :
5/1/2011 12:00:00 AM
Abstract :
The influence of a periodically grounded neutral conductor on voltages induced by first and subsequent negative strokes in single-phase overhead lines for different ground resistivity values is investigated by means of computational simulations using the hybrid electromagnetic model. Configurations of medium- and low-voltage networks were assumed. Currents of first and subsequent strokes with median parameters obtained from the measurements of Mount San Salvatore and Morro do Cachimbo stations were adopted. While the simulation of subsequent stroke considered the current departing from the ground, the first-stroke simulation considered 100-m-height attachment of the upward and downward leaders. For the conditions simulated herein, the results indicated the largest induced-voltage amplitudes for first-stroke events.
Keywords :
earthing; lightning; power overhead lines; downward leaders; first-stroke simulation; ground resistivity; hybrid electromagnetic model; negative lightning strokes; periodically grounded neutral conductor; single-phase overhead lines; size 100 m; upward leaders; Computational modeling; Conductivity; Conductors; Grounding; Lead; Lightning; Medium voltage; Electromagnetic induction; electromagnetic transient analysis; lightning; lightning-induced voltages; lossy ground; neutral conductor;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
DOI :
10.1109/TEMC.2011.2106134