DocumentCode :
2741524
Title :
Experimental impulse response of grounding grids
Author :
Visacro, Silverio ; Guimaraes, N.M.B. ; Araujo, Roger A. ; De Araujo, Listz S.
Author_Institution :
Lightning Res. Center, Fed. Univ. of Minas Gerais, Belo Horizonte, Brazil
fYear :
2011
fDate :
1-4 Nov. 2011
Firstpage :
637
Lastpage :
641
Abstract :
Experimental tests, consisting in the impression of low amplitude impulsive currents with lightning-patterned waveforms on a real grounding grid, were performed to assess the grid transient response. Simultaneous waves of current and grounding potential rise were measured considering the current impression on different points along the grid electrodes (earth termination) to determine the impulsive grounding impedance. Currents with very short front-times were used to show strong propagation effects in the soil, responsible for values of grounding impedance always significantly larger than the measured low frequency resistance and strongly dependent on the position where current was impressed on the grid.
Keywords :
earthing; electric impedance; electrodes; lightning protection; grid electrodes; grid transient response; grounding grids; grounding impedance; impulse response; impulsive grounding impedance; lightning-patterned waveforms; Current measurement; Electrodes; Grounding; Impedance; Lightning; Soil; Voltage measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Lightning (APL), 2011 7th Asia-Pacific International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4577-1467-2
Type :
conf
DOI :
10.1109/APL.2011.6110205
Filename :
6110205
Link To Document :
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