Doctor in Engineering at Universidad Nacional de Colombia; Master in Mechanical Engineering - Metrology and Instrumentation at Universidade Federeal de Santa Catarina Brasil UFSC; Electrical Engineer at Universidad Nacional de Colombia
RESEARCH, TEACHING, or OTHER INTERESTS
Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment, Biotechnology, Multidisciplinary
14
Scopus Publications
Scopus Publications
Development of a personal lightning shelter Francisco Roman, Jorge Rodriguez, Jorge Cristancho, Carlos Rivera, Edwin Pineda, et al. 2025 Ursi Asia Pacific Radio Science Meeting AP Rasc 2025, 2025
Lightning impulse current tests on some electroconductive fabrics Jorge Alejandro Cristancho, Jorge Enrique Rodriguez, Carlos Andrés Rivera, John Jairo Pantoja, Liz Karen Herrera, et al. Journal of Applied Research and Technology, 2023 On the search of lightweight lightning protection materials that can be used as part of Lightning Protection Systems (LPS), we investigate some types of electroconductive fabrics by applying several high lightning impulse currents in laboratory. Samples of four commercially available electroconductive textiles were analyzed: two rip-stop, a plain-weave, a non-woven, and additionally a carbon-impregnated polymeric film. Under laboratory conditions, each sample was subject to several subsequent lightning-like currents, recording both voltage and current signals. Optical and scanning electron microscope observations were performed after tests, revealing some patterns or morphological changes on the fabric surface. Despite these changes, the investigated conductive textiles withstand the several lightning impulse currents applied. Results suggest that some conductive fabrics could be used in personal mobile shelters, to protect human beings against the earth potential rise caused by a close lightning discharge.
Revisiting a case of lightning-caused trauma in a pregnant woman Jorge Alejandro Cristancho, Jorge Enrique Rodriguez, Francisco Roman 2021 35th International Conference on Lightning Protection Iclp 2021 and 16th International Symposium on Lightning Protection Sipda 2021, 2021 This paper analyzes from a technical point of view, a medical case reported in 2016 about a young couple, man and pregnant woman, stroked by a lightning flash current in the Southwestern United States, resulting in third trimester fetal injury. The most probable scenario of the case it is recreated and analyzed the evidence reported to give a probable explanation of the fetal injury under the panorama of other similar cases. The outcomes of a research work that uses an in-silico simulation in a 3D body model was used to show the current density distribution inside a human body due to a lightning-caused step potential. This study helps to give a possible explanation of the fetal injury at nine-month and the posterior disability of the baby, not given until now.
Behavior of an Electroconductive Rip-stop Fabric under 8/20 μs Lightning Current: Preliminary Results Jorge A. Cristancho, Jorge E. Rodriguez, Carlos Rivera, Francisco Roman, Alexandre Piantini, et al. 2021 35th International Conference on Lightning Protection Iclp 2021 and 16th International Symposium on Lightning Protection Sipda 2021, 2021 Lightning strokes can hit buildings, structures, living beings, and the ground, jeopardizing the integrity and health of people and animals and causing damages to trees and equipment. Some outdoor human activities in backcountry places require adequate lightning protection systems (LPS) to reduce the risk of damage to health. Preliminary research has shown that the use of electroconductive fabrics could serve as part of lightweight LPSs. In this research work we investigate the behavior of samples of a rip-stop electroconductive fabric submitted to lightning impulse currents with amplitudes in the range 5 kA to 20 kA and 8/20 µs waveshape. Both the voltage and current signatures were recorded. The results show that there is more than one mechanism of electric conduction in the electroconductive fabric, allowing it to endure lightning currents.
10/350 μs Lightning Impulse Current Behavior of a Conductive Fabric Francisco Roman, Daniel Rodriguez, Mahbubur Rahman, Andre Lobato, Jorge Rodriguez, et al. 2021 35th International Conference on Lightning Protection Iclp 2021 and 16th International Symposium on Lightning Protection Sipda 2021, 2021 Lightweight Portable Lightning Protection Shelters require the use of new materials capable of supporting the high current densities associated with lightning currents. In this paper, 30 x 30 cm2 conductive fabrics samples are subjected to 10/350 µs lightning current impulses. This experimental work, performed at the HV lab of Uppsala University, is aimed at understanding the transversal pattern of scratches or striations observed in conductive fabrics in previous experiments performed at the HV lab of Universidad Nacional de Colombia with 8/20 µs lightning impulse currents. Striations were recorded with both a still camera and a fast-recording camera, while the samples current was measured. Additionally, the withstand current density of the tested conductive fabrics was obtained.
Thermal simulation of a conductive fabric sheet subjected to a lightning-like current John Pantoja, Carlo Rivera, Jorge Cristancho, Jorge Rodriguez, Francisco Roman Applied Computational Electromagnetics Society Journal, 2020 A sample of electroconductive fabric subjected to a lightning-like current impulse is analyzed in this contribution. A multiphysics simulation is used to calculate the temperature distribution produced by a lightning-like current flowing through the material sample. A decoupled, electromagnetic (EM) and thermal, simulation was conducted for the analysis and is explained in the paper. The scaling factor calculation to represent the energy presented during current impulse tests is also detailed. Numerical results present patterns that agree with experimental tests reported in the literature and represent an additional tool for the phenomena insight.
Model for the Estimation of Partial Burst of Ripstop Electro-Conductive Fabrics John J. Pantoja, Jorge Cristancho, Jorge Rodriguez, Carlos Rivera, Francisco Roman, et al. 2020 33rd General Assembly and Scientific Symposium of the International Union of Radio Science Ursi Gass 2020, 2020 This paper presents the analysis of high current impulsive tests performed on electro-conductive fabrics. A ripstop conductive fabric is tested against 5.4 kA and 9.0 kA $8/ 20 \\mu \\mathrm{s}$ lightning currents. An equivalent circuit is used to represent the conductive interwoven yarns and the contact resistance between them. Using the proposed circuit and calculating the Specific Action applied at the woven sections and at the contact points, the change of phase and the loss of material on the conductive layer is described. Results show that the Specific Action can be used to estimate determined effects in materials as function of the excitation current signal.
Thermal Simulation of a Conductive Fabric Sheet Subjected to a Lightning-like Current John J. Pantoja, Carlos Rivera, Jorge Cristancho, Jorge Rodriguez, Francisco Roman 2020 International Applied Computational Electromagnetics Society Symposium Aces Monterey 2020, 2020 A sample of electroconductive fabric subjected to a lightning-like current impulse is analyzed in this contribution. A multiphysics simulation is used to calculate the temperature distribution produced by a lightning-like current flowing through the material sample. A decoupled, electromagnetic (EM) and thermal, simulation was conducted for the analysis and is explained in the paper. The scaling factor calculation to represent the energy presented during current impulse tests is also detailed. Numerical results present patterns that agree with experimental tests reported in the literature and represent an additional tool for the phenomena insight.
Specific action as a metric to determine thermal degradation of conductive fabrics exposed to high current impulses Progress in Electromagnetics Research C, 2020
Fatal livestock lightning accident in Colombia C. Jorge Alejandro Cristancho, Holman Suarez, Yeison Urbano, Francisco Roman 2017 International Symposium on Lightning Protection Xiv Sipda 2017, 2017
