Improvement of surface flashover in vacuum
WitrynaAbstract: High voltage vacuum surface flashover is a source of fast particles with velocities of up to $5.10^{5}$ m/s which makes it attractive for use in highly efficient pulsed plasma thrusters (PPT). Directional patterns of mass, charge and velocity of particles in plasma bunches are important parameters by which the efficiency of PPT … Witryna17 lut 2024 · Improving surface flashover voltage on vacuum-dielectric interface irradiated by electrons is a long-standing challenge for developing high-voltage and high-power spacecraft technology. The basic issue is understanding the role of radiation electrons in the process of surface flashover.
Improvement of surface flashover in vacuum
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Witryna9 kwi 2024 · Experimental results show that the surface flashover voltage of treated samples improves remarkably and increases with the injection energy. After ion implantation, the content of fluorine in the treated samples decreases, and the content of oxygen increases. Witryna1 gru 2011 · Functionally graded insulation system can suppress the electron emission, and succeed in improving surface flashover performance in vacuum [15][16][17][18][19] [20]. A schematic diagram of the ...
Witryna21 paź 2024 · A new insulation structure of Mo/Al2O3 cermet-Al2O32 ceramic-Mo/Al2O3 cermet was designed to improve the surface flashover performance in vacuum through co-firing, where the volume addition of metal Mo was managed from 2 vol% to 50 vol% and there could exist one or two layers with different Mo addition in Mo/Al2O3 cermet. … WitrynaThe pressure on the sample is controlled by adjusting the screw DC ramp voltage is applied until the flashover on the surface of the electrode system. HV supply is 1.5 kV, DC. Volume of the sample occurs. The occurrence of flashover is conduction current is measured for 300 seconds.
Witryna11 kwi 2024 · The surface charge and flashover voltage are calculated according to the secondary electron emission avalanche (SEEA) model, which reveals that the positive surface charges are reduced near the ... Witryna1 kwi 2011 · The effects of both conductivity and permittivity of Mo/Al 2 O 3 cermets on the DC and impulse surface flashover voltage in vacuum were experimentally investigated. The result showed that the DC and impulse surface flashover voltage were improved by 52% and 95%, respectively.
Witryna24 mar 2024 · To improve the surface flashover performance is of great significance for the development of advanced power transmission equipment and insulation …
WitrynaThe author reviews surface flashover (i.e. voltage breakdown along the surface of insulators), primarily in vacuum. He discusses theories and models relating to … healthy working lives award programmeWitryna9 mar 2024 · In addition, surface flashover is an important dielectric performance of insulating materials. In the process of surface flashover, arc develops along the dielectric surface [ 35 ]. Thus, the strength of arc ablation resistance can also be used to characterize the ablation during the surface flashover. healthy working lives fire risk assessmentWitrynaSurface flashover is a crucial issue in the field of electrical insulation, and it involves many complex physical processes. In this paper, the development process of the surface flashover was studied from different methods. The initial process of positive surface streamers in different gas environments (air, N2, CO2) was studied by photoelectric … moundville hiking trailsWitryna11 kwi 2024 · The surface charge and flashover voltage are calculated according to the secondary electron emission avalanche (SEEA) model, which reveals that the positive … healthy working ergonomicsWitryna2 cze 2024 · two-layer model. It was found that the improvement in surface °ashover performance in vacuum was caused by the decrease of electric fleld at the triple … moundville health clinicWitryna17 cze 2024 · The movement of metal particles is effectively inhibited when a DC GIL’s (gas-insulated transmission line) electrode is coated. This article aims to study the problem of coating falling off during GIL operation and the change in the particle-inhibitory effect after coating ageing. A closed constant temperature heating … moundville historyWitrynaThe temperature-variable stage comprises: introducing a cooling gas into the carburizing chamber after the pulse carburizing stage, so that a surface layer of a workpiece is rapidly cooled to a temperature below 700°C and stabilized for a period of time, so that carbides are uniformly precipitated and spheroidized; then pumping to vacuum ... moundville high school alabama