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Response of Grounding Electrodes to Impulsive Currents: An Experimental Evaluation

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2 Author(s)
Visacro, S. ; Lightning Res. Center & Dept. of Electr. Eng., Fed. Univ. of Minas Gerais, Belo Horizonte ; Rosado, G.

Experimental results for the transient behavior of grounding electrodes are presented to clarify fundamental aspects of the grounding response to lightning currents. It is shown that for fast current waves, the value of impulsive grounding impedance ZP of short electrodes is smaller than its low-frequency resistance R LF while electrodes longer than the effective length have a resistance value smaller than impulsive impedance. The values found for the ratio ZP/R LF in the experiments are lower than those resulting from numerical simulation for electrodes shorter than the effective length.

Published in:

Electromagnetic Compatibility, IEEE Transactions on  (Volume:51 ,  Issue: 1 )

Date of Publication:

Feb. 2009

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