Experimental Evaluation of Potential Distribution in a Grounding Grid Subjected to Impulse Current

Malone Soares de Castro, Raimundo C. S. Freire, Edson Guedes da Costa, Euler C. T. Macedo, Newton S. S. da Fonseca, Thais L. Silva

Abstract

A methodology to evaluate the response of a grounding grid system subjected to electrical current impulses is proposed in this work. The methodology is based on analysing the signal of voltage propagated in the vicinity of the injection rod. An impulse generator (80 kJ/100 kV) was used to generate waveform 8/20 µs, this is a signal that represent lightning surge. The signals were acquired using by a digital oscilloscope. From the results obtained, one observes that the amplitude of propagated voltage is attenuated in the direction of propagation.

Keywords

current impulse, grounding grid, hv measuring, potential distribution

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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