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Process of Surface Flashover in Vacuum Under Nanosecond Pulse

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6 Author(s)
Junping Tang ; State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University (XJTU), Xi'an, China ; Aici Qiu ; Li Yang ; Wei Jia
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In a wide variety of high-power pulsed devices, vacuum surface flashover plays a key role in the system performance. High-speed electrical measurements with temporal resolution in the nanosecond range were employed to measure the flashover characteristics, and high-speed three-frame photography was used to image the flashover channels at different phases along the insulator surface. From these test results, the flashover under nanosecond pulse would experience a process with three typical phases: initial phase, developing phase, and extinguishing phase. Spectra luminosity of the flashover channel is also discussed for better understanding the mechanism of the flashover process.

Published in:

IEEE Transactions on Plasma Science  (Volume:38 ,  Issue: 1 )