Corona from floating electrodes

Román, Francisco; Cooray, Vernon; Scuka, V.

doi:10.1016/0304-3886(96)00005-8

Cited by 19 publications

(9 citation statements)

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“…As confirmed by other numerical simulations [26] and by both a theoretical model and experiments [25], the radial electric field on the surface of the conductor in this case (see Configuration 1) is described by the Lambert's cosine law, whereas Experimental set-up (3) produces a nearly radial and constant field.…”

Section: -P6supporting

confidence: 60%

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Experimental results using corona discharge to attempt to reproduce the Turin Shroud Image

Fanti

Lattarulo

Pesavento

2015

SHS Web of Conferences

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Abstract.It is well known that the Turin Shroud (TS) body image is not reproducible with all its peculiar features, but a great number of attempts have been made to reproduce at the same time the macro-and micro-scale properties of the double (front and back) image of the human body impressed on the most important Relic of the Christianity. The authors are convinced that among these experiments, those performed using CD (Corona Discharge) allowed to reproduce the greatest number of similarities.The experiments were performed in the high-voltage laboratory of the University of Padua where CD was used to produce human images using linen clothes enveloping a halfscale conductive manikin of a man postured in the same way as the TS Man.The manikin was suspended from ground and connected through the feet to a 300-kV DC supply. The resulting CD produced a human image on the enveloping linen cloth after proper aging. Due to the draping configuration, the image showed various distortions of pseudo-cylindrical type.The structure of the resulting electric field and the influence of the cover producing a partial barrier effect was studied together with the pseudo-cylindrical distortions that resulted less evident in the TS image. This information was used to study the enveloping configuration of the TS during the image formation

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Section: -P6supporting

confidence: 60%

“…[24,25] where imaging has been numerically obtained by an exogenous and uniform electric field applied to a discharged and floating body [24].…”

Section: -P6mentioning

confidence: 99%

Experimental results using corona discharge to attempt to reproduce the Turin Shroud Image

Fanti

Lattarulo

Pesavento

2015

SHS Web of Conferences

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“…As per Figure 8, for the parameters specified in the simulation, there could be an arcing to the sphere from the target, up to a separation of about 2.2 m. This will be the proposed work for the validation of this simulation. Effects of floating electrodes in increasing the probability of breakdown in air gaps (decreasing the average breakdown voltage) are proven experimentally in several previous studies (Roman et al 1996(Roman et al , 1999Nourirad et al 2014), however, these studies have been done with high voltage impulses rather than high current impulses.…”

Section: Discussionmentioning

confidence: 92%

“…where d is the relative air density (1 at STP), k 1 is 30 kV/cm, k 2 is 0.47 cm À1/2 for a sphere and R is the radius of the sphere in cm. The Equation ( 1) has been extensively used in the literature to explain the floating electrodes under ambient electric fields (Roman et al 1996;Roman et al 1999;Sumereder 2010). As per this equation, for the given sphere the critical electrical field, E c , is 4.4 MV/m.…”

Section: Direct Strikesmentioning

confidence: 99%

Do metal objects such as mobile phones increase lightning risk?

Gomes

Khurshid²

2021

Geomatics, Natural Hazards and Risk

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This study has been carried out to test two hypotheses; whether a small metal object such as mobile phones in possession of a human body increases the chances of a direct lightning strike and whether a similar object increases the chances of a side flash. Simulations were done in COMSOL Multiphysics for a metal sphere of radius 10 mm placed at the head level of a 2 m tall human being. A five-meter-tall cylindrical lightning target of resistivity 2.75 GX m and 10 nX m were considered. The influence of the side flash increases with the size of the metal object and also as its shape deviates from the spherical dimension. The outcomes of the study confidently discard the possibility of a metal object of practically viable size on a human body to influence the direct lightning attachment process. A metal sphere of radius about 22 m or a person of height 8.5 m is required for increasing the possibility of such a direct strike. Thus, the popular public concept is firmly rejected. However, the same metal object may significantly increase the side flash probability if the victim is close to the lightning struck object or inside an unsafe shelter.

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“…Intensive work was initiated during the second half the 1990s and the first decade of the 2000s to solve scientific questions related to floating electrodes. The characteristics of insulated metallic bodies in very intense electric fields were studied in Román et al (1994Román et al ( , 1996aRomán et al ( , 1996bRomán et al ( , 1998b, , Valencia andVelázquez (1998), Román, (1995b) and Valencia (2009).…”

Section: Floating Electrodesmentioning

confidence: 99%

The Electromagnetic Compatibility Research Group: research questions

Campos

2010

Ing. Inv.

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This paper summarises the Universidad Nacional de Colombia’s Electrical and Electronic Engineering Department’s Electromagnetic Compatibility Research Group (EMC-UNC) activities during the last 30 years. The group was involved in developing experimental tools during the early 1980s, such as constructing high-voltage apparatus, developing high-voltage practical work for students and observing electrical discharges. These tools enabled the group to spend a decade focused on resolving one of the Colombian electrical sector’s main EMC problems: distribution transformer’s failures caused by lightning. For almost a decade this investigation was focused on understanding the causes of the extremely high failure index in Colombian rural areas, especially in the Rionegro basin. The main result of this investigation was a reduction by one order of magnitude in mean 10% distribution transformer failure rate. During this research work a noticeable pattern was observed of several electrically-isolated metallic bodies immersed in an electric field (i.e. floating electrodes). This was led to initiating floating electrode studies and formulating a new scientific question, “How do corona electrical discharges interact with floating electrodes?” This new research question was dealt with during the second half of the 1990s and the first decade of the 2000s. This investigation was related to using electrostatically-accumulated charge on a floating electrode. This question opened up four research areas: gas discharge physics, generating fast current impulses, harvesting energy from the electric field and the possibility of high impedance current sources. This paper has summarised the most relevant work done by the EMC-UNC group on these topics. This floating electrode research work started by formulating four patents. Fresh research questions for the 2010s were related to measuring lightning electromagnetic pulses (LEMP), intentional electromagnetic interference (IEMI) studies, measuring picoseconds-rise-time impulses, cleaning water by corona discharge and harvesting, accumulating and using small amounts of energy extracted from electric and electromagnetic fields. The future of the EMC-UNC group is closely related to interaction with other groups.

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Corona from floating electrodes

Cited by 19 publications

References 0 publications

Experimental results using corona discharge to attempt to reproduce the Turin Shroud Image

Experimental results using corona discharge to attempt to reproduce the Turin Shroud Image

Do metal objects such as mobile phones increase lightning risk?

The Electromagnetic Compatibility Research Group: research questions

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