Measurement of Ionization and Attachment Coefficients in Sulphur Hexafluoride in Uniform Fields

Bhalla, M S; Craggs, J D

doi:10.1088/0370-1328/80/1/318

Cited by 149 publications

(61 citation statements)

References 14 publications

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“…101 However, with a hemispherical site of radius 10~2mm, there is a maximum number of 2 X 10 3 electrons produced at a distance 6-5 x 10 3 mm from the site, which are subsequently attached to negative ions within a distance of 2-5 x 10~2mm. The total number of positive ions created is 1-2 x 10~4 within a distance of 1 -5 X 10~"" 2 mm, and a similar number of negative ions is produced.…”

Section: Breakdown Caused By Electron-field Emission Alonementioning

confidence: 99%

Electrical breakdown for uniform fields in compressed gases

Cookson

1970

Proc. Inst. Electr. Eng. UK

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The electrical breakdown and prebreakdown characteristics of uniform fields in compressed gases are described. The failure of Paschen's law and the dependence of the breakdown voltage on the material, preparation and area of the electrodes, on the dust content of the gas, and on the type of applied voltage are included. The failure of the Townsend and streamer mechanisms of low-pressure breakdown is discussed, and a summary is made of the many suggested breakdown mechanisms for compressed gases. These are divided into three groups: breakdown due only to field emission of electrons, breakdown due to electron-field emission and space charge in the gas, and breakdown due to electron-field emission and charge collection on an electrode. The breakdown and prebreakdown characteristics are interpreted in terms of the various breakdown mechanisms, and the areas indicated where further investigations are needed. The surface flashover of insulating spacers in compressed gases is also briefly reviewed. '

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Section: Breakdown Caused By Electron-field Emission Alonementioning

confidence: 99%

Electrical breakdown for uniform fields in compressed gases

Cookson

1970

Proc. Inst. Electr. Eng. UK

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“…where A is the saturation ionization in the gas at a particular E/p (electric stress/pressure) and B is related to the excitation and ionization energies [10] , [11].…”

Section: Present Approachmentioning

confidence: 99%

“…The values of A and B in equation (2) for SF 6 [9], [11] are given in Table 1. Using breakdown voltages V b from [12] and the values of A and B from Table 1, k is computed and obtained [13] as a function of pt′ as shown in Table 2.…”

Section: Present Approachmentioning

confidence: 99%

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Estimation of partial discharge inception voltages in the ambient medium of SF<inf>6</inf>

Zuberi

Masood

Husain

et al. 2008

2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century

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In this paper we report a technique for estimating the Partial Discharge (PD) inception voltages in case of discharges occurring at the interface as well as in voids in the ambient medium of Sulphur Hexafluoride gas (SF 6 ). Since occurrence of PD is a phenomenon dependent on upon many factors such as the type of gas in the void, the gas pressure, surface properties of the void, size and shape of the void, dielectric constant of the surrounding medium; these parameters have to be taken into account. The computed values are valid in the pressure range of 0.067 kPa to 101.333 kPa. Computations are accurate to ± 3.5 % in the pt′ range of 0.3 -1200 kPa-cm. These computations are useful in understanding discharges in the insulation system of cables, capacitors, GIS, bushings or epoxy cast equipment which are dried and impregnated at low pressures and may contain gas pockets at sub-atmospheric pressures. These computations are also important and useful for high altitude insulation design and spacecraft insulation.

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“…Ionization (a) and attachment (n) coefficients of SF6' Experiment: X -Geballe and Harrison [16],0 -Bhalla and Craggs [17],\1-McAfee and Edelson [18], 6. - Maller and Naidu [19 J , (P20; 1 torr).…”

Section: Evaluation Of the Cross Sectionsmentioning

confidence: 99%

Insulating properties of mixtures of nitrogen with electronegative gases

Novák

Fréchette

1984

1984 IEEE International Conference on Eletrical Insulation

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Calculations of the transport coefficients of insulating electronegative gases and their mixtures were performed under the conditions of the Townsend steadystate experiment.The Boltzmann equation was used for evaluation of the unknown collision cross sections by fitting calculated ionization coefficients, drift velocities and diffusion coefficients to experimental data.A stainless-steel vacuum chamber (lO-s torr), provided with a pair of Rogowski-profile electrodes, was set up and used to carry out a series of measurements. The ionization and attachment coefficients were evaluated from the steady-state prebreakdown currents. Results for SF6 are presented in this paper.

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Measurement of Ionization and Attachment Coefficients in Sulphur Hexafluoride in Uniform Fields

Cited by 149 publications

References 14 publications

Electrical breakdown for uniform fields in compressed gases

Electrical breakdown for uniform fields in compressed gases

Estimation of partial discharge inception voltages in the ambient medium of SF<inf>6</inf>

Insulating properties of mixtures of nitrogen with electronegative gases

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