SOIL RESISTIVITY INVESTIGATIONS FOR SUBSTATION GROUNDING SYSTEMS IN WETLAND REGIONS – A CASE STUDY OF LAGOS STATE, NIGERIA
Journal Title: ASIAN JOURNAL OF NATURAL & APPLIED SCIENCES - Year 2017, Vol 6, Issue 4
Abstract
Soil resistivity - a measure of how much the soil resists the flow of electricity is a critical factor in the design of safe and efficient grounding systems. Actual resistivity measurements are required to fully qualify soil resistivity and its effects on any proposed substation grounding system. This paper investigated the soil resistivity in three different sites in Lagos – a wetland region in Nigeria during the wet and dry seasons of 2016 in line with the relevant IEEE Standards and International best practices for determining resistivity levels for substation grounding system designs. To locate the soil of acceptable resistivity values that would ensure effective grounding system design for substations in the region, the Wenner Four-Pin Method was deployed. The findings show that soil resistivity in wetland areas varies according to seasons being significantly high during the dry seasons and significantly low during the wet seasons. The outcome of this study is useful for purposes of estimating the ground resistance and potential gradients including step and touch voltages of substation grounding installations and for computing inductive couplings between neighboring power and communication circuits within and around wetland regions.
Authors and Affiliations
Hachimenum Nyebuchi Amadi
Keywords
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