The mechanism of leader breakdown in electronegative gases

Niemeyer, L.; Ullrich, L.; Wiegart, N.

doi:10.1109/14.90289

Cited by 152 publications

(154 citation statements)

References 11 publications

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“…The images of figure 11 are taken with peak voltages of around 12 kV for the 25 mbar images to 18 kV for the 300 and 1000 mbar images 3 . Also for other voltages the same merging behaviour as function of pressure was observed.…”

Section: Mergingmentioning

confidence: 99%

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Reconnection and merging of positive streamers in air

Nijdam¹,

Geurts²,

Veldhuizen³

et al. 2009

J. Phys. D: Appl. Phys.

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Pictures show that streamer or sprite discharge channels emerging from the same electrode sometimes seem to reconnect or merge though their heads carry electric charge of the same polarity; one might therefore suspect that reconnections are an artefact of the two-dimensional projection in the pictures. Here we use stereo photography to investigate the full three-dimensional structure of such events. We analyse reconnection, possibly an electrostatic effect in which a late thin streamer reconnects to an earlier thick streamer channel, and merging, a suggested photoionization effect in which two simultaneously propagating streamer heads merge into one new streamer. We use four different anode geometries (one tip, two tips, two asymmetric protrusions in a plate and a wire), placed 40 mm above a flat cathode plate in ambient air. A positive high voltage pulse is applied to the anode, creating a positive corona discharge. This discharge is studied with a fast ICCD camera, in many cases combined with optics to enable stereoscopic imaging. We find that reconnections as defined above occur frequently. Merging on the other hand was only observed at a pressure of 25 mbar and a tip separation of 2 mm, i.e. for a reduced tip distance of p · d = 50 µm bar. In this case the full width at half maximum of the streamer channel is more than 10 times as large as the tip separation. At higher pressures or with a wire anode, merging was not observed.

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Section: Mergingmentioning

confidence: 99%

“…Such self-avoiding behaviour is incorporated in phenomenological dielectric breakdown models, see, e.g. [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Reconnection and merging of positive streamers in air

Nijdam¹,

Geurts²,

Veldhuizen³

et al. 2009

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

“…It is assumed that an electron is present as soon as the necessary field value for electron emission is reached. But the time scales of the negative formative time lag are larger than those at positive polarity [13]. The lower electric fields in the case of negative polarity (due to lower breakdown voltages), may further increasing the negative formative time lag [10].…”

Section: Discussionmentioning

confidence: 96%

“…Besides longer statistical time lags in the case of positive polarity, the time to arc formation is also influenced by the formative time-lag [10]. The time scales of this formative time-lag are larger for negative polarity [13].…”

Section: Breakdown In Sfmentioning

confidence: 99%

SF₆ high voltage circuit breaker contact systems under lightning impulse and very fast transient voltage stress

Simka

Straumann

Franck

2012

IEEE Trans. Dielect. Electr. Insul.

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“…Theoretically, these modes have been modeled using stochastic Laplacian fractal simulation with power-law (fourth-power to linear) of the field strength and threshold (cutoff) voltage [4,5]. This work was a logical extension of the earlier modeling of streamers in electronegative gases [6].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Growth of Streamers During Liquid Breakdown

Kim

Hebner

Hallock

2008

IEEE Trans. Dielect. Electr. Insul.

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Earlier work by Fowler, Davaney, and Hagedorn showed that the morphology of an anode streamer could be modeled as stochastic growth of a branching fractal tree in point-plane geometry. This investigation reproduces the results of that earlier study. Because one of the concerns about the earlier work is that the electric field dependence appeared to be unphysical, the model was modified to operate under assumptions that are consistent with those that have proven useful in earlier investigations. Specifically, linear electric field dependence was assumed and there is an assumed variability in the number density of available electrons. Computations using this assumption also produce the same range of morphologies that has been measured in experiments. In addition, some assessments of sensitivity to other possible variables are made. First, the sharp cutoff in the electric field strength is replaced with a presumably more realistic exponential dependence on energy. Under this assumption, it is also possible to simulate the experimentally observed behavior of anode streamers. It is shown that three possible refinements to the model have small, and likely negligible, effects. The first is using variable streamer step lengths in the calculation rather than the fixed step length used in the earlier work. The second is to assume growth at one point in the streamer makes growth in other parts somewhat less likely. The third is the assumption that the probability of a streamer making the next step in growth is influenced by the distance of the inter-electrode gap that has already been traversed.

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The mechanism of leader breakdown in electronegative gases

Cited by 152 publications

References 11 publications

Reconnection and merging of positive streamers in air

Reconnection and merging of positive streamers in air

SF₆ high voltage circuit breaker contact systems under lightning impulse and very fast transient voltage stress

Modeling the Growth of Streamers During Liquid Breakdown

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The mechanism of leader breakdown in electronegative gases

Cited by 152 publications

References 11 publications

Reconnection and merging of positive streamers in air

Reconnection and merging of positive streamers in air

SF6 high voltage circuit breaker contact systems under lightning impulse and very fast transient voltage stress

Modeling the Growth of Streamers During Liquid Breakdown

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Product

Resources

About

SF₆ high voltage circuit breaker contact systems under lightning impulse and very fast transient voltage stress