Design of the room temperature insulation breaks for ITER correction coil feeders

•The GFRP manufactured by glass fiber wet-winding in vacuum environment can reduce void ratio inside GFRP.•Though the RTIBs for ITER CC feeders is designed for RT application, which can be used under cryogenic temperature too.•During a low temperature excursion, He tightness of the interface between...

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Bibliographic Details
Published in:Fusion engineering and design 2019-06, Vol.143, p.154-158
Main Authors: Pan, Wanjiang, Bauer, Pierre, Carrillo, David, Journeaux, Jean-Yves, Zhu, Yinfeng, Wu, Cheng, Cao, Yi, Chen, Xinrui
Format: Article
Language:English
Subjects:
Coils
Electric field
Electric fields
Electrical faults
Feeders
Finite element method
Glass fiber reinforced plastics
Helium
High temperature
High-voltage
Insulation
Insulation break
ITER
Partial discharge
Pipework
Room temperature
Stainless steels
Superconducting magnet
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Summary:•The GFRP manufactured by glass fiber wet-winding in vacuum environment can reduce void ratio inside GFRP.•Though the RTIBs for ITER CC feeders is designed for RT application, which can be used under cryogenic temperature too.•During a low temperature excursion, He tightness of the interface between SS electrode and GFRP tube can be realized. The room temperature insulation breaks (RTIBs) for the International Thermonuclear Experimental Reactor (ITER) project insulate the helium (He) outlets of the High Temperature Superconducting (HTS) current leads in the feeders, which can be at up to 30 kV, from the grounded pipework returning the gas to the liquefier plant. Gaseous He at RT is particularly vulnerable to electrical breakdown, requiring an additional design effort as compared to that for cryogenic IBs with more than hundred times denser cryogenic He. To satisfy the working requirements, stainless steel (SS) pipes and glass fiber reinforced plastic (GFRP) were used to develop the RTIBs for the ITER Correction Coil (CC) feeders. Electrical and mechanical analyses of the RTIBs using finite element models were performed. In particular, the electric field distribution along the helium gas path and possible de-bonding or shear failure of the composite were investigated. In this paper, the results of the analysis are discussed. Further experiments indicate the designed RTIB can satisfy the functional require-ments.
ISSN:0920-3796
1873-7196
DOI:10.1016/j.fusengdes.2019.03.136