Positive Corona and Atmospheric Negative Ion Density under Repetitive Impulse Conditions

Allen, N.L.; Berger, G.; Dring, D.

doi:10.1109/tia.1987.4505019

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…Thus, in air, streamers were only produced under conditions of relatively low negative density. A similar result was reported earlier for the rod-plane gap in air [2] where the negative ion density was varied.…”

Section: Corona Development Comparison Between Insulator Surface and Airsupporting

confidence: 89%

“…The equilibrium density of molecular ions, of both polarities, in the normal atmosphere free of discharges or abnormal chemical products, is of the order of 10 8 m −3 . However, previous studies have shown that weak additions to the concentration of atmospheric negative ions causes significant changes to the corona under impulse voltages at a rod electrode in air [2]. It has also been shown that the deposition of negative ions on a glass surface in air has significant effects upon corona and flashover [3].…”

Section: Introductionmentioning

confidence: 99%

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The role of negative ions in the propagation of discharges across insulating surfaces

Allen¹,

Hashem

2002

J. Phys. D: Appl. Phys.

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The relative importance of atmospheric negative ions in corona formation and breakdown in a radial electric field has been investigated, with special reference to effects occurring at an insulating surface of a cycloaliphatic polyurethane with dolomite filler. The inception times, corona charge, light emission (by UV photography) and sparkover voltages under lightning impulses have been recorded under natural atmospheric conditions and under the influence of negative ions introduced from an auxiliary corona. The presence of excess negative ions on the surface is shown to increase both the charge injected and the mean radius of the corona, attributable to an augmentation of streamer discharges. In similar experiments in air, the excess ions cause a transition to a `glow' discharge. Effects of negative ions on sparkover are not significant on the insulator surface, but they cause a small increase in air. Comparisons between the two cases lead to the conclusion that the most important effect of the ions on the surface is to provide `seed' electrons for streamer propagation, following ion detachment in the field of advancing streamer tips.

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Section: Corona Development Comparison Between Insulator Surface and Airsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

The role of negative ions in the propagation of discharges across insulating surfaces

Allen¹,

Hashem

2002

J. Phys. D: Appl. Phys.

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“…Positive and negative ions can be further divided into small ions and large ions [10]. Their concentration in the air depends on atmospheric conditions.…”

Section: Discussionmentioning

confidence: 99%

Partial discharge inception voltage of water drops on insulating surfaces stressed by electrical field

Feier-Iova

Hinrichsen

2009

2009 IEEE Electrical Insulation Conference

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This paper reports on recent investigations, from a practical and theoretical point of view, regarding the partial discharge (PD) of water drops on an insulating surface exposed to electrical field stress. The assays are made using a sample, which consists of a cubical silicone rubber block with two embedded electrodes so that the electrical field is tangential to the surface. One or more water drops are placed on the sample between the electrodes. First, the three dimensional movement and deformation of the water drops on the insulating surface was recorded with the help of a high-speed camera. In the same time, partial discharge measurements were made using exclusively a photomultiplier module. The observed low inception voltages cannot be explained without assuming a severe deformation of the drop. Furthermore, the PD inception electrical field strength turned out to depend on absolute ambient humidity in a different way than for the general breakdown field strength: it decreases with increasing absolute humidity. Systematical investigations were performed under controlled humidity and temperature using a climate chamber. Parameter as volume of the drops was varied during the experiments. Based on the experimental findings, a correlation between PD inception and atmospheric conditions was established. The electrical field distribution was calculated using field simulation software based on the Maxwell equations. When simulation results are compared with experimental findings, a correction factor with humidity must be considered.

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Inception Characteristics of Surge Corona on Line Conductors

Bousiou

Mikropoulos

2023

IEEE Trans. Dielect. Electr. Insul.

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Positive Corona and Atmospheric Negative Ion Density under Repetitive Impulse Conditions

Cited by 3 publications

References 3 publications

The role of negative ions in the propagation of discharges across insulating surfaces

The role of negative ions in the propagation of discharges across insulating surfaces

Partial discharge inception voltage of water drops on insulating surfaces stressed by electrical field

Inception Characteristics of Surge Corona on Line Conductors

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