Dielectric Recovery of Vacuum Arcs after Strong Anode Spot Activity
- 1 January 1987
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Plasma Science
- Vol. 15 (5) , 538-544
- https://doi.org/10.1109/tps.1987.4316750
Abstract
Recovery of dielectric strength and post-arc currents after diffuse and constricted vacuum arcs were measured for filat OFHC-Cu contacts (D = 25 mm, d = 7.5 mm) enclosed in a bakable UHV chamber. The arc current pulse had a trapezoidal shape of 5.5-ms duration with peak values up to 11 kA. In comparison with the fast recovery of diffuse arcs, the recovery of constricted arcs with gross melting is considerably retarded. Post-arc currents are simulated using the Andrews-Varey model extended to include the effects of secondary electron emission due to ion bombardment of the cathode and loss of the plasma due to thermal motion. The flow of charge carriers to the anode and the shield, which is at the anode's potential, are registered separately. The amount and decay of the residual plasma is evaluated from the measurements of post-arc current. The decay times of a few tens of a microsecond give evidence of ions with energies below 1 eV. The origin and effect of slow ions on recovery is discussed.Keywords
This publication has 18 references indexed in Scilit:
- Electrical Breakdown in VacuumIEEE Transactions on Electrical Insulation, 1985
- Time- and Spatially Resolved Spectroscopy of the Plasma State Prior to and during Anode-Spot Formation in High-Current Vacuum ArcsIEEE Transactions on Plasma Science, 1985
- Ion induced electron emission from polycrystalline copperNuclear Instruments and Methods in Physics Research, 1981
- Triggering mechanisms in triggered vacuum gapsIEEE Transactions on Electron Devices, 1977
- Deionisation of an interrupted vacuum arcProceedings of the Institution of Electrical Engineers, 1977
- Post-arc current mechanism in vacuum interruptersJournal of Physics D: Applied Physics, 1973
- The dielectric breakdown of low density gases. II. Experiments on mercury vapourProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1971
- Dielectric Recovery and Shield-Currents in Vacuum-Arc InterruptersIEEE Transactions on Power Apparatus and Systems, 1971
- Analysis of the Electrode Products Emitted by dc Arcs in a Vacuum AmbientJournal of Applied Physics, 1969
- Vacuum arc recovery phenomenaProceedings of the IEEE, 1964