Title :
Transient resistivity measurements on 345-kV transmission towers
Author :
Chisholm, W.A. ; Jamali, B. ; Mathew, Michael ; Driscoll, Jeff ; Bologna, F.F.
Author_Institution :
METSCO, Toronto, ON, Canada
Abstract :
A transient injection method was used to simultaneously measure the time variation of footing impedance and soil resistivity on a series of 345-kV steel pole towers. For each tower, the ratio of transient resistivity to impedance, giving an effective tower perimeter, reached an asymptote by 500 ns. The soil resistivity estimates were log-normally distributed with natural log standard deviation of 0.63 for this locale. These time-evolved resistivity values are compared with observations based on frequency domain modeling.
Keywords :
earthing; electric impedance measurement; electric resistance; poles and towers; soil; transients; effective tower perimeter; footing impedance; soil resistivity; steel pole tower; time evolved resistivity; time variation; transient injection method; transient resistivity measurement; transmission tower; voltage 345 kV; Conductivity; Electric potential; Electrodes; Grounding; Impedance; Poles and towers; Soil; Lightning; frequency dependent resistivity; grounding; time domain; transient; transmission tower;
Conference_Titel :
Lightning Protection (XII SIPDA), 2013 International Symposium on
Conference_Location :
Belo Horizonte
Print_ISBN :
978-1-4799-1343-5
DOI :
10.1109/SIPDA.2013.6729177
