Impulse Voltage Field Emission Characteristics and Breakdown Dependency upon Field Strength in Vacuum Gaps

Shioiri, T.; Ohshima, I.; Honda, Masaki; Okumura, H.; Takahashi, H.; Yoshida, Hiroshi

doi:10.1109/mper.1982.5519936

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1985

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“…Very few, studies have been reported micron-sized alumina powder and ultrasonically cleaned on pbd conduction in vacuum gaps under ac and switching before use. Great care was taken to prevent any conimpulse excitations [4][5][6][7][8][9][10][11]. These studies are more tamination during handling.…”

Section: Introductionmentioning

confidence: 99%

Prebreakdown Conduction in Vacuum Gaps under Switching Impulse Excitations

Srinivasa

Nagabhushana

1985

IEEE Trans. Elect. Insul.

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The present investigation concerns prebreakdown conduction in vacuum gaps under slow impulses. Hemispherical, plane, and needle electrodes have been used in a vacuum emvironment of better than 0.1 mPa. The gap spacings were 0.5, 1, and 1.5 mm. The front times ranged from 200 ps to 5 ins. The results indicate that prebreakdown currents were smaller than the highest sensitivity of 10-7 Afor front times of about 1 ins. For larger front times, breakdown currents were observed, which increased with front time. The voltagecurrent relationship appears to follow Fowler-Nordheim theory but Fowler-Nordheim plots are branched. The high magnitudes may be attributed to ion-assisted field emission based on which a model has been developed, that agrees substantially with experimental results. Applicability of non-metallic type of emission is discussed.

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Section: Introductionmentioning

confidence: 99%