High voltage insulation of bushing for HTS power equipment |
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| Authors: | Woo-Jin Kim Jae-Hyeong Choi Sang-Hyun Kim |
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| Affiliation: | 1. School of Electrical and Computer Engineering, Shiraz University, Shiraz, Iran;2. School of Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran;1. Electrical Engineering Department, Faculty of Industrial Education, Sohag University, Sohag, Egypt;2. Electrical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt;3. Mechanical Engineering Department, Faculty of Engineering, Assiut University, Assiut, Egypt;1. Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi''an, Shaanxi 710024, China;2. State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China;1. Delft University of Technology, Mekelweg 4, 2628 CD Delft, the Netherlands;2. HAEFELY AG, Birsstrasse 300, 4052 Basel, Switzerland;1. College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, PR China;2. Applied Superconductivity Laboratory, Southwest Jiaotong University, Chengdu 610031, PR China;3. State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, PR China;4. National Laboratory of Rail Transit, Chengdu 610031, PR China |
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| Abstract: | For the operation of high temperature superconducting (HTS) power equipments, it is necessary to develop insulating materials and high voltage (HV) insulation technology at cryogenic temperature of bushing. Liquid nitrogen (LN2) is an attractive dielectric liquid. Also, the polymer insulating materials are expected to be used as solid materials such as glass fiber reinforced plastic (GFRP), polytetra-fluoroethylene (PTFE, Teflon), Silicon (Si) rubber, aromatic polyamide (Nomex), EPDM/Silicon alloy compound (EPDM/Si).In this paper, the surface flashover characteristics of various insulating materials in LN2 are studied. These results are studied at both AC and impulse voltage under a non-uniform field. The use of GFRP and Teflon as insulation body for HTS bushing should be much desirable. Especially, GFRP is excellent material not only surface flashover characteristics but also mechanical characteristics at cryogenic temperature. The surface flashover is most serious problem for the shed design in LN2 and operation of superconducting equipments. |
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