15?kV class high-voltage electrical vacuum feedthrough |
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Affiliation: | 1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China;2. School of Mechanical and Electrical Engineering, Anhui Jianzhu University, Hefei 230601, China;3. Power Research Institute of Yunnan Power Grid Co., Ltd., Kunming 650217, China;1. Institute of Plasma Physics, Chinese Academy of Science, Hefei, China;2. University of Science and Technology of China, Hefei, China;3. Fusion for Energy, Barcelona, Spain;1. Electrical Engineering Department, Sharif University of Technology, Tehran 11365-11155, Iran;2. School of Electrical Engineering, Iran University of Science and Technology, Tehran 16844, Iran;1. Insitute of Plasma Physics, Chinese Academy of Science, Hefei 230031, People’s Republic of China;2. University of Science and Technology of China, Hefei 230026, People’s Republic of China |
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Abstract: | In the feeder system of the Experimental Advanced Superconducting Tokamak (EAST), the high-voltage (HV) electrical vacuum feedthrough plays an important role in transmitting the voltage signals from one vacuum environment to anther vacuum environment under cryogenic temperature. Due to no commercial solutions, the feedthroughs for EAST were developed in the Institute of Plasma Physics, Chinese Academy of Sciences. In this paper, the structural design, electrical analysis, structural analysis and experiments involving thermal cycle, helium gas tightness, HV-leakage current and Paschen discharge are presented. The experimental result indicates that the leak rate of the developed feedthroughs was less than 1 × 10?9 Pa·m3·s?1. After the 5 thermal cycles from room temperature (RT) to 77 K, the HV-leakage current experiment under 10?3 Pa vacuum environment and the Paschen discharge experiments of feedthroughs were performed, the leakage current under 15 kV DC is lower than the allowable value 5 µA, and the leakage currents in helium gas and nitrogen gas from 1 Pa to 50 kPa are lower than the allowable value 10 µA. |
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Keywords: | High-voltage Feedthrough Tokamak Superconducting magnet Insulation Electric field Paschen discharge |
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