Applying Electromagnetic Field Analysis to Minimize the Earth Resistance on High Resistivity Soils

Peñacoba, Silvia Ronda; García, Clara Oliver; Vilchez, Oibar Martínez; Paniagua, Patricia Márquez; Pantoja, José Miguel Miranda

doi:10.2528/pierm20072303

Cited by 3 publications

(1 citation statement)

References 8 publications

(12 reference statements)

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“…According to Olowofela et al (2020), soil resistivity greatly influenced the performance of earthing systems. It had been observed that soils with high resistance are not considered appropriate for operative earthing system, as they will compromise the proper function of the earthing system (Ronda et al, 2020). The European standards EN-62305-3 recommend earth resistance of 10 Ω for structures in which direct equipotential bonding is applied (International Electrotecnical Commission [IEC], 2010).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the geotechnical and electrical properties of soil samples around Delta State Polytechnic, Ozoro, Nigeria

Uguru¹,

Obukoeroro²

2021

Appl. J. Phys. Sci.

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Effective earthing system is the lifeline of any electrical wiring and installations. This study was done to evaluate the geotechnical (moisture content and electrical conductivity) and electrical properties of soil samples within the school of engineering complex, Delta State Polytechnic, Ozoro, Nigeria. All the geotechnical and electrical parameters investigated in this study were done in accordance to ASTM International approved methods. The electrical conductivity meter was used to measure the soil electrical conductivity; while the soil resistance was measure through the Wenner four probes method. Results obtained from but the field and laboratory tests revealed that the soil electrical conductivity, soil moisture content and the soil resistances varied greatly across the study area. The moisture content ranged from 15.48 to 24.45% (wb); while the electrical conductivity ranged between 3.09 and 5.41 dS/m. The results revealed that the soil resistance decreases as the probe distance increased from 5 to 10 m. At 5 m probes distance, the soil resistance varied between 4.8 and 17.2 Ω; at 10 m probes distance, the soil resistance ranged from 2.9 to 14.8Ω; while at 15 m probes distance, the soil resistance fell between 1.5 and 10.5 Ω. In terms of the soil resistivity, the results showed the region with clay soil had the lowest soil resistivity (mean~158.15 Ωm), while the region with the sandy recorded the highest soil resistivity of 820 Ωm. The knowledge of these soil properties is crucial for design of earthing systems for structures within the school of engineering complex. This will help to minimize electrical hazards to both human being and the materials within the complex.

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Section: Introductionmentioning

confidence: 99%

Evaluating the geotechnical and electrical properties of soil samples around Delta State Polytechnic, Ozoro, Nigeria

Uguru¹,

Obukoeroro²

2021

Appl. J. Phys. Sci.

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Drafting an Electrostatic Charge Control Plan for a Large Scale Scientific Instrument: Guidelines and a Case Study

Oliver¹,

Martinez²,

Ronda³

et al. 2021

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Large-scale scientific instruments strongly support top-level research all around the world. Besides their intrinsic merits, they often play a valuable role as pathfinders for developing and testing instrumentation and as training grounds for young researchers. Strategies and roadmaps for these facilities have become a priority for a number of private and public funding organizations. Despite the large amount of mature work done in the industrial arena, it is difficult to find documents providing clear and concise orientation on how to prevent or minimize the damage caused by electrostatic discharges (ESD) in research infrastructure. This paper aims to gather all this information to develop a static charge control plan for a large-scale scientific facility. The specific case of the static charge control plan for the installation of CTA-LST telescopes is added as an example and verification of the actual applicability of the measures proposed in this document, providing static charge in human body monitoring measurements. Specific tests performed on equipment with ESD sensitive components are also described, which helped to assess any possible damage.

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Verification Protocols for the Lightning Protection of a Large Scale Scientific Instrument in Harsh Environments: A Case Study

Martinez¹,

Ronda²,

Oliver³

et al. 2021

JPEE

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This paper is devoted to the study of the most suitable protocols needed to verify the lightning protection and ground resistance quality in a large-scale scientific facility located on a site with high risk of lightning strikes. We illustrate this work by reviewing a case study: the largest telescopes of the Northern Hemisphere Cherenkov Telescope Array, CTA-N. This array hosts sensitive and high-speed optoelectronics instrumentation and sits on a clear, free from obstacle terrain at around 2400 m above sea level. The site offers a top-quality sky but also features challenging conditions for a lightning protection system: the terrain is volcanic and has electrical resistivities well above 1 kOhm•m. In addition, the environment often exhibits humidities well below 5%, and strong winds pose challenging conditions. On the other hand, the high complexity of a Cherenkov telescope structure does not allow a straightforward application of lightning protection standards. We describe here how the risk assessment of direct strike impacts was made and how contact voltages and ground system were both tested. Finite Element Simulation (COMSOL Multiphysics) has been used to estimate the current flowing through the parts of the earthing system designed for the telescopes in the case of a direct strike impact. This work is intended to provide assistance to scientists and managers involved in the construction of scientific installations, particularly those in charge of defining verifiable reliability and safety requirements for lightning protection.

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Applying Electromagnetic Field Analysis to Minimize the Earth Resistance on High Resistivity Soils

Cited by 3 publications

References 8 publications

Evaluating the geotechnical and electrical properties of soil samples around Delta State Polytechnic, Ozoro, Nigeria

Evaluating the geotechnical and electrical properties of soil samples around Delta State Polytechnic, Ozoro, Nigeria

Drafting an Electrostatic Charge Control Plan for a Large Scale Scientific Instrument: Guidelines and a Case Study

Verification Protocols for the Lightning Protection of a Large Scale Scientific Instrument in Harsh Environments: A Case Study

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