Effect of electrode surface roughness on breakdown in nitrogen/SF6 mixtures

Farish, O.; Ibrahim, O.E.; Crichton, B.H.

doi:10.1049/piee.1976.0233

Cited by 26 publications

(9 citation statements)

References 4 publications

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“…Our calculated breakdown voltages for N2/SF6 mixtures agreed well with measured values in uniform field small gaps and in cylindrical geometry, as well as with other calculations [12]. The measured values of breakdown voltages of N2/SF6 mixtures in large coaxial geometry [9] agreed with values calculated here at 1 bar, but at higher pressures they were significantly less, possibly because of surface roughness or particles.…”

Section: % 251 D'supporting

confidence: 89%

Possible high pressure nitrogen-based insulation for compressed gas insulated cables

Pace

McCorkle

Waymel³

Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena

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Electricite' de France (EDF) is contemplating 420 kV compressed gas insulated cables (CGIC) as much as tens of kilometers long and environmentally acceptable. An extensive literature review is being made to determine as well as possible how to use nitrogen alone or with minimum SF6 for insulation; the literature will probably not provide all information needed. Some measurements are also being made at EDF. Highlights are given here.

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Section: % 251 D'supporting

confidence: 89%

Possible high pressure nitrogen-based insulation for compressed gas insulated cables

Pace

McCorkle

Waymel³

Proceedings of 1995 Conference on Electrical Insulation and Dielectric Phenomena

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“…Hence it would seem desirable to employ artificial protrusions of similar dimensions. To-date however, the dimensions of the different protrusions have all been >100 im [4][5][6], suggesting that it is not readily possible to obtain single, artificial protrusions of the appropriate dimensions, see Fig. 2 for the influence of D=100 vm.…”

Section: Discussionmentioning

confidence: 99%

“…a sphere [4], a hemisphere [5], or a circular wire [6]. For the purposes of the present discussion, we will examine the use of the last named, see Fig.…”

Section: Simulation Of a Rough Surfacementioning

confidence: 99%

On the Concept of Electrode to Discharge Phenomena in Surface Roughness With Reference Strongly Electronegative Gases

McAllister

1986

IEEE Trans. Elect. Insul.

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The use of geometrically well-defined protrusions in studies of the effects of electrode surface roughness upon the insulation strength of strongly electronegative gases is discussed.It is argued that, with respect to the roughness associated with production processes, the dimensions of artificial protrusions are inevitably too large. Consequently, results from investigations using such protrusions are not necessarily applicable to practical conditions.

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“…The test samples are made of PTFE, because it has a high bulk resistivity of >10 20 Ωm and surface resistivity of >10 18 Ωsquare [35]. The permittivity of the PTFE used is ε r = 2.1.…”

Section: Figurementioning

confidence: 99%

“…The breakdown voltage reduction due to electrode roughness was studied in detail over the last 40 years. The reduction of the breakdown voltage of arrangements with rough surfaces could be shown as well as the reduction of the PD discharge onset voltage [14][15][16][17][18]. 14 15 16 17 18 The consequence of partial discharges from protrusions and micro discharges from rough surfaces is a release of additional ions into the gas phase that can accumulate at the insulator surface.…”

Section: Introductionmentioning

confidence: 98%