Title :
Frequency dependence of soil parameters: The influence on the lightning performance of transmission lines
Author :
Visacro, Silvério ; Silveira, Fernando H. ; Xavier, Sillas ; Ferreira, Henrique B.
Author_Institution :
LRC - Lightning Res. Center, UFMG - Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil
Abstract :
The impact of the frequency dependence of soil parameters on the lightning response of transmission lines was assessed by simulation, taking an existing 138-kV line as reference. This can be important for overvoltages experienced across insulators due to lightning strikes, in particular of first strokes and soil resistivity above 300 Ωm. The effect causes a percentage decrease of the backflashover rate expected under the assumption of constant soil parameters of around 8%, 20% and 25% for values of soil resistivity of 300, 1000 and 2000 Ωm.
Keywords :
electrical resistivity; insulators; lightning protection; overvoltage protection; power transmission lines; backflashover rate; constant soil parameters; frequency dependence; insulators; lightning performance; lightning response; lightning strikes; overvoltages; soil resistivity; transmission lines; Conductivity; Frequency dependence; Grounding; Insulators; Lightning; Soil; Surges; Impact of frequency dependent soil parameters on backflashover; Lightning; Performance of transmission lines; Soil resistivity and permittivity;
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.2012.6344274
