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- W2900474879 abstract "The high-voltage performance of insulator is one of the main areas of pulsed power research and development, and the surface flashover voltage is the critical factor strongly influencing the voltage hold-off capability of vacuum pulsed power devices. In this work, the influence of different electrodes and boundary conditions on the electric field distribution at the triple junction was simulated and experimentally studied. The results indicate the value of V ho can be raised significantly as the screening length increased from 3mm to 18mm, the hold-off voltage of the screening electrode is up to 150 kV and over 50% higher than that of the plate electrode. However, the hold-off voltage decrease after the screening electrode becomes longer than ∼18 mm. The reason for the observed wide dispersion in the breakdown values for the different electrodes was explored by examining surface structures of the insulator under an SEM (Scanning Electron Micrograph). When the value of screening length is greater than 18mm, we could find breakdown point in special area. For the better explanation of the experiment phenomenon, a simulation model of the surface flashover in vacuum with special configuration is established by a 2D PIC-DSMC code, in which some basic physical process such as field emission in the vicinity of the metal-vacuum-dielectric junction, charge accumulation effect in insulator surface, secondary electron emission, gas desorption, and electrons interact with gas etc are considered. These simulation results are in comparison with the experiment phenomenon, these are the base to in-depth understand surface flashover in vacuum. A new developing process of surface flashover in vacuum by high voltage pulses is also discussed." @default.
- W2900474879 created "2018-11-29" @default.
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- W2900474879 date "2018-09-01" @default.
- W2900474879 modified "2023-09-26" @default.
- W2900474879 title "Surface Flashover of Alumina Ceramic Insulators in Vacuum" @default.
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- W2900474879 doi "https://doi.org/10.1109/deiv.2018.8537150" @default.
- W2900474879 hasPublicationYear "2018" @default.
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