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

fYear

2012

fDate

2-7 Sept. 2012

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICLP.2012.6344274

Filename

6344274