Title :
Assessing the impact of subsequent strokes on the lightning performance of transmission lines of 138 kV
Author :
Silveira, Fernando H. ; Visacro, Silvério ; De Souza, Ronaldo E. ; De Conti, Alberto
Author_Institution :
LRC - Lightning Res. Center, UFMG - Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil
Abstract :
The Hybrid Electromagnetic Model was used systematically to determine lightning overvoltages across insulator strings due to direct strikes to the tower top in order to assess the importance of subsequent strokes on backflashovers for 138-kV transmission lines. It was found that for some specific conditions, especially for lines with high towers and low tower-footing grounding resistances, subsequent strokes may be a relevant source of lightning outages.
Keywords :
computational electromagnetics; earthing; insulators; lightning protection; power overhead lines; power transmission protection; backflashover; high tower; hybrid electromagnetic model; insulator strings; lightning outage; lightning overvoltages; lightning performance; low tower footing grounding resistance; power transmission lines; subsequent lightning strikes; voltage 138 kV; Grounding; Insulators; Lightning; Poles and towers; Power transmission lines; Resistance; Surges; Grounding; Lightning overvoltage; Lightning parameters for engineering application; Lightning performance of transmission lines; Subsequent strokes;
Conference_Titel :
Lightning Protection (ICLP), 2012 International Conference on
Conference_Location :
Vienna
Print_ISBN :
978-1-4673-1898-3
Electronic_ISBN :
978-1-4673-1896-9
DOI :
10.1109/ICLP.2012.6344275
