EXPERIMENTAL EVALUATION OF A GROUNDING GRID SUBJECTED TO HIGH INTENSITY CURRENT IMPULSE

M. S. de Castro, R. C. S Freire, E. G da Costa, J. R. Lima F., L. F. D. da Silva

Abstract

Grounding grids are fundamental for the safety of people and equipments in power system. Atmospheric discharges cause serious damage to the electrical system. So, it is important to study the performance of grounding grids subjected to high intensity current impulses. In order to analyze the performance of grounding grid subjected to current impulses, it was applied current impulses up to 2 kA into the soil. To produce the current impulses, it was used from 15 kV to 35 kV to charge the capacitors of an impulse generator. By using an oscilloscope it was acquired current and voltage signals applied into the soil. From these measurements, impulse impedance and transient impedance are obtained. From the results it is observed that the impedance increased when the signal amplitude increased. It was also observed that the impedance tends to the value of ground resistance at low frequency.

Keywords

current impulse, grounding grid, impulse impedance, transient impedance

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IMEKO-WC-2015-TC4-107.pdf

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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