Streamer and leader breakdown in air at atmospheric pressure in strongly non-uniform fields in gaps less than one metre

Seeger, Martin; Votteler, T.; Ekeberg, Jonas; Pancheshnyi, Sergey; Sanchez, Luis Santos

doi:10.1109/tdei.2018.007246

Cited by 26 publications

(27 citation statements)

References 33 publications

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“…The minimal steady propagation field in our simulations is about 4.1 kV/cm. This value agrees well with the lowest stability fields in air in previous experimental studies [10,11,13].…”

Section: Steady Propagation In Different Background Electric Fieldssupporting

confidence: 92%

“…We now consider the relation between the streamer length and the concept of a stability field. The streamer stability field is usually defined as E st = V 0 /d, where V 0 is the applied voltage at which a streamer is just able to cross a discharge gap of width d [1,10,12,13]. This concept can in principle also be applied to streamers that do not cross the gap, with a length L s < d. A commonly used empirical equation, see e.g.…”

Section: Stability Fieldmentioning

confidence: 99%

“…An important empirical concept for streamer propagation has been the "stability field" E st [7], which is often defined as the minimal background electric field that can sustain streamer propagation. Experimentally, stability fields have been extensively investigated [8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

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A computational study of steady and stagnating positive streamers in N2-O2 mixtures

Li,

Guo,

Sun

et al. 2022

Preprint

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In this paper, we address two main topics: steady propagation fields for positive streamers in air and streamer deceleration in fields below the steady propagation field. We generate constant-velocity positive streamers in air with an axisymmetric fluid model, by initially adjusting the applied voltage based on the streamer velocity. After an initial transient, we observe steady propagation for velocities of 3×10 4 m/s to 1.2×10 5 m/s, during which streamer properties and the background field do not change. This propagation mode is not fully stable, in the sense that a small change in streamer properties or background field eventually leads to acceleration or deceleration. An important finding is that faster streamers are able to propagate in significantly lower background fields than slower ones, indicating that there is no unique stability field. We relate the streamer radius, velocity, maximal electric field and background electric field to a characteristic time scale for the loss of conductivity. This relation is qualitatively confirmed by studying streamers in N 2 -O 2 mixtures with less oxygen than air. In such mixtures, steady streamers require lower background fields, due to a reduction in the attachment and recombination rates. We also study the deceleration of streamers, which is important to predict how far they can propagate in a low field. Stagnating streamers are simulated by applying a constant applied voltage. We show how the properties of these streamers relate to the steady cases, and present a phenomenological model with fitted coefficients that describes the evolution of the velocity and radius. Finally, we compare the lengths of the stagnated streamers with predictions based on the conventional stability field.

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“…The minimal steady propagation field in our simulations is about 4.1 kV/cm. This value agrees well with the lowest stability fields in air in previous experimental studies [10,11,13].…”

Section: Steady Propagation In Different Background Electric Fieldssupporting

confidence: 92%

Section: Stability Fieldmentioning

confidence: 99%

See 1 more Smart Citation

A computational study of steady and stagnating positive streamers in N2-O2 mixtures

Li,

Guo,

Sun

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…Recently, the concept of the streamer stability field has been more commonly used in association with streamers propagating in inhomogeneous electric fields. It relates the maximum length a streamer could gain to the applied voltage [43,44,45,46,47]. An older definition used the term stability field to mean the homogeneous electric field in which a streamer would propagate in a stable manner -without changes in velocity and shape [21,22,23].…”

Section: The Stability Fieldmentioning

confidence: 99%

Simulations of positive streamers in air in different electric fields: steady motion of solitary streamer heads and the stability field

Francisco¹,

Teunissen²,

Bagheri³

et al. 2021

Preprint

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We simulate and characterize positive streamers in ambient air in homogeneous background electric fields from 4.5 to 26 kV/cm in a 4 cm gap. They can accelerate or decelerate depending on the background electric field. Many experiments have shown that a streamer keeps propagating in a stable manner in the so-called stability field of 4.5 to 5 kV/cm. Our fluid streamer simulations in STP air show that: (1) In a homogeneous field larger than 4.675 kV/cm, a single streamer accelerates, and in a lower field, it decelerates and eventually stagnates with a small radius and very high field enhancement. (2) In a field of 4.675 kV/cm, the streamer head propagates with an approximately constant velocity of 6.7 × 10 4 m/s and an optical radius of 55 µm over distances of several centimeters as a stable coherent structure. These values for the radius and velocity agree well with measurements of so-called minimal streamers. (3) Behind the uniformly translating streamer head, the channel conductivity decreases due to electron attachment, and the electric field returns to its background value about 1 cm behind the head. The propagation behavior of the solitary streamer agrees with the original definition of the stability field, which is the homogeneous field in which a streamer can propagate with a constant speed and shape.

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“…The stem acts as a prolongation of a tip and new streamer corona is observed at the stem forefront. [22]. In the following stage, while increasing the voltage, dielectric barrier discharges (DBD) occur.…”

Section: Imaging Of Corona Discharges and Correspondence With Pd Phase-resolved Patterns In Configuration With Dielectric Barriermentioning

confidence: 99%

Partial Discharge Imaging Correlated with Phase-Resolved Patterns in Non-Uniform Electric Fields with Various Dielectric Barrier Materials

et al. 2020

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This paper describes a correlation of partial discharge phase-resolved patterns with an optical imaging performed in a non-uniform electric field configuration. The influence of different dielectric barrier materials, placed on the plane electrode, on the discharge propagation and surface landing was investigated. The investigations were focused on the corona at positive polarity of AC high voltage. It was found that the initial positive corona stage is similar for all cases whereas the discharge propagation and surface landing strongly depends on the barrier material properties. The observed streamer discharge modes have been described by the geometrical measures such as stem length, stretch of a discharge profile on the dielectric barrier surface and an hemispherical envelope of discharge filaments. Since various dielectrics reveal different properties of charge accumulation and surface neutralization, the charge memory effect may be visible and can be related to the ability to create and sustain of additional electric field component. It may refer to subsequent discharges as well as to conditions faced at the voltage polarity reversal. The correspondence between different forms of phase-resolved patterns have been associated with the modes of streamer discharges observed by optical imaging. Presented methodology poses huge potential for both scientific investigations on underlying discharge phenomena as well as on the application in future diagnostic systems of HV insulation.

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Streamer and leader breakdown in air at atmospheric pressure in strongly non-uniform fields in gaps less than one metre

Cited by 26 publications

References 33 publications

A computational study of steady and stagnating positive streamers in N2-O2 mixtures

A computational study of steady and stagnating positive streamers in N2-O2 mixtures

Simulations of positive streamers in air in different electric fields: steady motion of solitary streamer heads and the stability field

Partial Discharge Imaging Correlated with Phase-Resolved Patterns in Non-Uniform Electric Fields with Various Dielectric Barrier Materials

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