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DOI	10.1016/j.atmosres.2020.105238
	Observations of corona point discharges from grounded rods under thunderstorms
	Arcanjo M.; Montanyà J.; Urbani M.; Lorenzo V.; Pineda N.
发表日期	2021
ISSN	0169-8095
卷号	247
英文摘要	We investigated features of corona point discharges when a grounded conductive rod is subject to a high background electric field. In the laboratory, high voltage is applied to an upper plate in a plane-to-point experiment, and the discharges are observed from a grounded rod using an ultraviolet camera and a photosensor. The current is measured using a shunt resistor, a current transformer, and a high impedance ammeter. We have found that corona current pulses have fast rise time (tens of nanoseconds) and slow decay (hundreds of nanoseconds). For the initial stage of the discharges, above a certain threshold, the frequency of pulses increases with the voltage applied. In the field, one current sensor coupled to a grounded rod, 1.5 m above a roof, was installed in a site located at an altitude of 2525 m above sea level. The same pulses observed in the laboratory are recorded during periods of electric field enhancement caused by the movement of charged clouds or lightning activity near the sensor. For that specific installation, the frequency of pulses is correlated with the ambient electric field measured 250 m away. To the best knowledge of the authors, this is the first time in which such correlation is made for outdoor measurements, seeing that other works correlate the electric field with the average current flow. Pulses of positive corona were no longer observed when the electric field magnitude was lower than 1.8 kV/m and pulses of negative corona were more atypical and presented a higher threshold, of about 3.8 kV/m. This study is relevant for understanding the production of corona and space charges in high structures, such as wind turbine blades, towers, and buildings in general. © 2020 Elsevier B.V.
英文关键词	Corona discharge; Electric field; Lightning protection; Point discharge; Space charge; Trichel pulses
语种	英语
scopus关键词	Electric corona; Electric discharges; Electric field measurement; Electric transformers; Sea level; Turbomachine blades; Average currents; Corona currents; Electric field enhancement; Electric field magnitude; Lightning activity; Outdoor measurements; Point discharges; Wind turbine blades; Electric grounding; atmospheric electricity; atmospheric structure; corona; electric field; lightning; threshold; thunderstorm
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141741
作者单位	Lightning Research Group, Technical University of Catalonia, TR1, Carrer Colom 1, Terrassa, 08222, Spain; Dena Desarrollos S.L. (Ingesco), Carrer Cardener 5, Terrassa, 08223, Spain; Meteorological Service of Catalonia, Carrer Berlín 38-46, Barcelona, 08029, Spain
推荐引用方式 GB/T 7714	Arcanjo M.,Montanyà J.,Urbani M.,et al. Observations of corona point discharges from grounded rods under thunderstorms[J],2021,247.
APA	Arcanjo M.,Montanyà J.,Urbani M.,Lorenzo V.,&Pineda N..(2021).Observations of corona point discharges from grounded rods under thunderstorms.Atmospheric Research,247.
MLA	Arcanjo M.,et al."Observations of corona point discharges from grounded rods under thunderstorms".Atmospheric Research 247(2021).