Streamer Propagation along Profiled Insulator Surfaces under Positive Impulse Voltages

Meyer, Hans Kristian Hygen; Marskar, Robert; Bilsbak, Henriette; Mauseth, Frank; Schueller, Michael

doi:10.5324/nordis.v27i1.4494

Cited by 4 publications

(12 citation statements)

References 5 publications

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“…Comparing both experiments and simulations, we showed that surface profiles reduce both the velocity and range of positive streamers. Moreover, the authors experimentally compared propagation over surfaces with 0.5 mm deep rectangular cut corrugations with a flat surface in [17], and found that positive streamer propagation was more restricted over such surfaces than over semi-circular profiled or flat surfaces. It was also confirmed in [17] that positive streamers follow semicircular corrugations closely, as predicted by simulations in [16].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the authors experimentally compared propagation over surfaces with 0.5 mm deep rectangular cut corrugations with a flat surface in [17], and found that positive streamer propagation was more restricted over such surfaces than over semi-circular profiled or flat surfaces. It was also confirmed in [17] that positive streamers follow semicircular corrugations closely, as predicted by simulations in [16]. Wang et al [18] numerically examined the profile effect for both convex and concave corrugations.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we perform both computer simulations and high-speed imaging of experiments of positive streamers propagating over various dielectric surface profiles. We extend the analysis in [16] and [17], mainly by including simulations and more experiments of the rectangularly profiled surface, by using more elaborate plasma models, and by using a consistent impulse voltage curve in experiments and simulations. The goal of this article is two-fold.…”

Section: Introductionmentioning

confidence: 99%

“…This surface profile is shown in blue color in figure 1(c). The rectangular profile restricts streamer propagation along the surface as shown in [17] .…”

Section: Introductionmentioning

confidence: 99%

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Evolution of positive streamers in air over non-planar dielectrics: experiments and simulations

Meyer¹,

Marskar²,

Mauseth³

2022

Plasma Sources Sci. Technol.

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We study positive streamers in air propagating along polycarbonate dielectric plates with and without small-scale surface profiles. The streamer development was documented using light-sensitive high-speed cameras and a photo-multiplier tube, and the experimental results were compared with 2D fluid streamer simulations. Two profiles were tested, one with 0.5 mm deep semi-circular corrugations and one with 0.5 mm deep rectangular corrugations. A non-profiled surface was used as a reference. Both experiments and simulations show that the surface profiles lead to significantly slower surface streamers, and also reduce their length. The rectangular-cut profile obstructs the surface streamer more than the semi-circular profile. We find quantitative agreement between simulations and experiments. For the surface with rectangular grooves, the simulations also reveal a complex propagation mechanism where new positive streamers re-ignite inside the surface profile corrugations. The results are of importance for technological applications involving streamers and solid dielectrics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…This surface profile is shown in blue color in figure 1(c). The rectangular profile restricts streamer propagation along the surface as shown in [17] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evolution of positive streamers in air over non-planar dielectrics: experiments and simulations

Meyer¹,

Marskar²,

Mauseth³

2022

Plasma Sources Sci. Technol.

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“…Polyoxymethylene (POM) cylinders with 25 % glass fibre (ϵ r = 4.3) with 30 mm diameter were tested in the setup. Profiles were machined on the cylinder surface, with similar dimensions as the rectangular-cut profiles in previous work [9,10]. A non-profiled cylinder was used as a reference.…”

Section: Preparation Of Test Objectsmentioning

confidence: 99%

Surface Flashover over a Profiled Cylinder in Air

Meyer¹,

Marskar²,

Osberg³

et al. 2023

Preprint

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<p>The effect of a small-scale surface profile on the lightning impulse (LI) surface flashover over 30 mm diameter polyoxymethylene (POM) cylinders with 25 % glass fibre in air was studied. The cylinder surface was machined with 0.5x0.4 mm trenches spaced 0.6 mm apart. A non-profiled cylinder was used as a reference. The cylinders were tested in a 48.5 mm atmospheric air gap with an exposed triple junction as the positive electrode. The surface profiles increased the LI flashover voltage (U 50% ) from 70.0 to 96.5 kV peak . High-speed imaging showed surface streamer discharges stopping on the surface profiles. Discharge inception calculations were used to explain the influence of the surface profile on the flashover process. The results are relevant for technological applications with electrically stressed solid insulators in gases.</p>

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Surface Flashover Over a Microprofiled Cylinder in Air

Meyer

Marskar

Osberg

et al. 2023

IEEE Trans. Dielect. Electr. Insul.

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Increasing the lightning impulse (LI) flashover voltage of insulators can require significant changes to the geometry and material properties of the insulator or electrodes. In some cases, such changes can be difficult to implement as they may require more volume or may compromise e.g. mechanical properties of the insulating parts. In this work, a new micro-scale surface profile which inhibits streamer discharge propagation without introducing major changes to the insulation system geometry or materials is demonstrated. Polyoxymethylene (POM) cylinders with 25 % glass fibre in air were machined with 0.5x0.4 mm rectangular grooves spaced 0.6 mm apart and stressed with LIs. A non-profiled cylinder and a cylinder with a larger, semicircular grooves were tested for comparison. The cylinders were tested in a 48.5 mm atmospheric air gap with an exposed triple junction as the positive electrode. The rectangular surface profiles increased the LI flashover voltage (U 50% ) from 70.0 to 96.5 kV peak . High-speed imaging showed positive surface streamer discharges stopping on the surface profiles. Discharge inception calculations were used to explain the influence of the surface profile on the flashover process. The results are relevant for technological applications with electrically stressed solid insulators in gases.

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Streamer Propagation along Profiled Insulator Surfaces under Positive Impulse Voltages

Cited by 4 publications

References 5 publications

Evolution of positive streamers in air over non-planar dielectrics: experiments and simulations

Evolution of positive streamers in air over non-planar dielectrics: experiments and simulations

Surface Flashover over a Profiled Cylinder in Air

Surface Flashover Over a Microprofiled Cylinder in Air

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