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Discharge current distribution in stratified soil under impulse discharge

Fajingbesi, Fawwaz Eniola and Midi, Nur Shahida and Elsheikh, Elsheikh Mohamed Ahmed and Yusoff, Siti Hajar (2017) Discharge current distribution in stratified soil under impulse discharge. In: The International Technical Postgraduate Conference (Tech-Post 2017), 5th-6th of April 2017, Kuala Lumpur.

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Abstract

The mobility of charge particles traversing a material defines its electrical properties. Soil (earth) have long been the universal grounding before and after the inception of active ground systems for electrical appliance purpose due to it semi-conductive properties. The soil can thus be modelled as a single material exhibiting semi-complex inductive-reactive impedance. Under impulse discharge such as lightning strikes to soil this property of soil could result in electric potential level fluctuation ranging from ground potential rise/fall to electromagnetic pulse coupling that could ultimately fail connected electrical appliance. In this work we have experimentally model the soil and lightning discharge using point to plane electrode setup to observe the current distribution characteristics at different soil conductivity [mS/m] range. The result presented from this research indicate above 5% shift in conductivity before and after discharge which is significant for consideration when dealing with grounding designs. The current distribution in soil have also be successfully observed and analysed from experimental result using mean current magnitude in relation to electrode distance and location, current density variation with depth all showing strong correlation with theoretical assumptions of a semi-complex impedance material.

Item Type: Conference or Workshop Item (Plenary Papers)
Additional Information: 7394/59371
Uncontrolled Keywords: Conductive properties, Current distribution, Density variations, Electrical appliances, Electrode distances, Ground potential rise, Impulse discharges, Lightning discharge
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User: Nur Shahida Midi
Date Deposited: 16 Nov 2017 16:12
Last Modified: 22 Dec 2017 17:45
URI: http://irep.iium.edu.my/id/eprint/59371

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