Influence of metal-insulator junction on surface flashover in vacuum

Pillai, A. Sivathanu; Hackam, R.

doi:10.1063/1.338319

Cited by 28 publications

(11 citation statements)

References 16 publications

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“…In general, surface flashover in the field of power system has been intensively investigated, such as with high voltage of ac, dc, and microsecond pulse [1][2][3][4][5][6][7][8][9][10][11][12][13]. For instance, Pillai and Hackam have experimented surface flashover of solid insulators in vacuum using dc, ac, and μs-pulse voltages.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of surface flashover in vacuum using nanosecond pulses

Yan

Shao

Wang

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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Based on a Marx generator and a coaxial pulse forming line, an experimental investigation of surface flashover characteristics in vacuum is conducted by using nanosecond pulses of 10 ns rise time and 30 ns full width at half maximum (FWHM). Insulator dielectrics chosen for this investigation are Teflon, PMMA and Nylon. The tested factors include gas pressure, cone angle of conical frustum, diameter and length of cylindrical insulator, material and shape of electrode, and contact style between insulator and electrodes. The effects of these parameters on the surface flashover characteristics are described and analyzed in this paper. In addition, the character of flashover time lag in the nanosecond range, and surface flashover theory in vacuum charged by nanosecond pulses are also discussed.Index Terms -Surface flashover, vacuum, nanosecond pulse, cathode triple junction, electron emission. Ping Yan

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of surface flashover in vacuum using nanosecond pulses

Yan

Shao

Wang

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

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“…Single-pulsed surface flashover voltage of insulator can be considerably improved by reasonable design of electrodes. A.S.Pillai and R.Hackam used post insulators with metal inserts in various combinations to obtain a favorable electric field distribution [5][6][7][8]. Some surface flashover measurements using a cylindrical insulator with metal inserts or when placed in recessed electrodes have been reported.…”

Section: Introductionmentioning

confidence: 96%

Single-pulsed surface flashover voltage of the electrode geometry in vacuum

et al. 2010

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Single-pulsed surface flashover voltage of insulator can be considerably improved by reasonable design of electrode geometry. In the present work, the electric field distribution of cylindrical alumina insulators with different electrodes is simulated. Simulation results indicate that amendatory geometries could reduce electric field strength of the cathode-triple-junction(CTJ) and the ratio of electric field component parallel (F‖) to an insulating plane with the normal component (F⊥). The theoretically deduction demonstrates that the energy of the first electron collision can be reduced by decreasing the ratio of electric field (F‖/F⊥). Several electrodes are designed and manufactured, and surface flashover voltages of cylindrical alumina insulators are measured in vacuum in different electrodes using ~3μs singlepulsed. As a result, the reliable voltage hold-off of the screening electrode B is up to 150 kV and nearly 50% higher than that of the plate electrode. The measurements show good qualitative agreement with the behavior from the computation. Consequently, studies on the pulsed voltage holdoff property of the electrode geometry in vacuum could be quite helpful in designing of the insulating geometry for high voltage vacuum devices.

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“…5 For anode initiated flashover, the shielding should reduce electron emission from the insulator surface near the anode. 6,8 There are a number of different shielding arrangements that may be applied to an insulator, but it is not clear which technique works the best in any particular environment.…”

Section: Introductionmentioning

confidence: 99%

Dielectric flashover with triple point shielding in a coaxial geometry

Benwell

Kovaleski

Gahl

2007

Review of Scientific Instruments

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Increasing performance of vacuum insulator barriers is a common goal in pulsed power. Insulating performance is continually being improved while new methods are developed. Triple point shielding techniques have been shown to increase flashover voltage, but the role of cathode versus anode shielding is still not fully understood. Open circuit flashover characteristics were obtained for a coaxial geometry to view the effects of triple point shielding for this geometry. The tests included applying various combinations of triple point shields on zero and +45 degrees insulators. Shielding was tested at the cathode triple point outside of the dielectric and at the anode triple point inside the dielectric. The role of anode versus cathode triple point shielding was examined. Flashover voltage was observed to increase when either a cathode or anode triple point shield was applied; however, adding a shield to both regions lowered the flashover threshold. Both triple point regions were found to be important and dependent on each other for some coaxial geometries.

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Influence of metal-insulator junction on surface flashover in vacuum

Cited by 28 publications

References 16 publications

Experimental investigation of surface flashover in vacuum using nanosecond pulses

Experimental investigation of surface flashover in vacuum using nanosecond pulses

Single-pulsed surface flashover voltage of the electrode geometry in vacuum

Dielectric flashover with triple point shielding in a coaxial geometry

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