Determination of Critical Electric Field and Recommended Earth Resistance Values of Earthing Systems

Syarifah Abdullah; Shahirad Reffin; Normiza Mohamad Nor; Nurul Abdul Rahman; Noradlina Abdullah; Nkwa Agbor; Pauzi Yahaya; N. Hatta

doi:10.15866/iree.v12i4.12317

Determination of Critical Electric Field and Recommended Earth Resistance Values of Earthing Systems

Syarifah Abdullah⁽¹⁾, Shahirad Reffin⁽²⁾, Normiza Mohamad Nor^(3*), Nurul Abdul Rahman⁽⁴⁾, Noradlina Abdullah⁽⁵⁾, Nkwa Agbor⁽⁶⁾, Pauzi Yahaya⁽⁷⁾, N. Hatta⁽⁸⁾

^(*) Corresponding author

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DOI: https://doi.org/10.15866/iree.v12i4.12317

Abstract

Impulse characteristics of earthing systems are important for designing earthing systems and lightning protection. In this work, experimental investigation on the impulse response of earthing systems of the single rod and tower is presented. The earthing systems of the single rod and tower are installed at three different sites, with different level of soil resistivity. Calculation using CIGRE’s formulae is performed to determine the ionisation level of soil, which is also known as the critical electric field, Ec. Earth resistance values are also calculated using experimental results. It has been found that Ec is lower in high level of soil resistivity. Furthermore, the initial study indicates that it is important to consider the Ec and ionisation process occurring in soil when designing the earthing system.
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Keywords

Earthing Systems; Ionisation Process; Critical Electric Field; Earth Resistance Values

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References

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