Flashover characteristics of G-11 at different cryogenic temperatures

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Li, J.^1^2 ; Luo, L.M.^3 ; Huang, R.J.^1^2 ; Ma, J.H.^3 ; Liang, Y.Q.^3 ; Huang, C.J.^1 ; Wu, Z.X.^1 ; Shen, F.Z.^1^2 ; Wang, Y.G.^1^2 ; Xu, D.^1 ; Liu, H.M.^1 ; Zhang, H.^1 ; Li, L.F.^1^2

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

Beijing Wuzi University, China^3

关键词: Cryogenic environment;    Cryogenic temperatures;    DC-flashover voltage;    Electrical characteristic;    Flashover characteristics;    High voltage insulation;    International thermonuclear experimental reactor;    Temperature decrease;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012186/pdf
DOI  :  10.1088/1757-899X/502/1/012186

来源: IOP

【 摘 要 】

The feeder busbar joint system is an important component in the International Thermonuclear Experimental Reactor (ITER) project. The insulation materials for the feeder busbar joint play a crucial role in both mechanical support and high voltage insulation. The G-11 block, which is a kind of industrial high-pressure, glass-reinforced epoxy laminates, has been chosen for the feeder busbar joint as insulation and mechanical support. The electrical characteristics of the G-11 depend significantly on temperature. As the feeder system works at the temperature of 77K, to ensure safe operation, the DC flashover voltage is required to be studied in a cryogenic environment. In this work, DC flashover characteristics of the G-11 at both room and cryogenic temperatures have been investigated using a self-developed test system. The results show that the surface flashover voltage rises as the flashover times increase. In addition, results indicate that the flashover voltage of the G-11 depends on orientations and it increases as the temperature decreases.