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Electrical breakdown in soil under uniform background electric fields
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. (Lightning Research Group)ORCID iD: 0000-0002-3094-4120
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. HVDC ABB AB. (Lightning Research Group)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. (Lightning Research Group)
National University of Colombia. (Dept. of Electrical Engineering. School of Engineering)
2010 (English)Conference paper (Refereed)
Abstract [en]

The present study deals with the electrical breakdown in soil while being subjected to lightning-like voltage impulses for uniform background electric field and short interelectrodic distances. Most of the scientific work in soils and its component’s electrical properties focuses on power grounding systems and how they behave while managing low frequency and high impulse currents.

The used sand sample was tested in a sphere-sphere electrode configuration with a variable gap distance between 1 and 6mm. The sand sample and electrodes were contained in a cylindrical insulating test cell. The sand sample humidity content (HC) was carefully controlled at values of equilibrium moisture content (EMC), 3%, 7% and 11%. The voltage and current signatures were measured with shielded signal wires and a grounded metallic cabin for the digital oscilloscope.

  The equivalent electrical impedance of the sand sample, calculated as the ratio between voltage and current, showed a dynamic behavior depending on the sample humidity and the current following between the electrodes.

Place, publisher, year, edition, pages
2010.
Keyword [en]
High voltage techniques, grounding, electrical breakdown in soil
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Engineering Science with specialization in Atmospheric Discharges
Identifiers
URN: urn:nbn:se:uu:diva-298433OAI: oai:DiVA.org:uu-298433DiVA: diva2:946105
Conference
International Conference on Grounding and Earthing GROUND’2010 and 4th International Conference on Lightning Physics and Effects (LPE), Salvador, Brazil, 2010
Available from: 2016-07-04 Created: 2016-07-04 Last updated: 2016-07-04

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Diaz, OscarArevalo, Liliana
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