Modeling of epoxy resin spacers for the 1 MV DC gas insulated line of ITER neutral beam injector system

The spacers for the gas insulated transmission line for the ITER neutral beam injector will be designed to withstand the operating voltage of 1 MV dc. Electric charging processes of the spacer surface are then expected to play an important role in the final electric field distribution. Aim of the pa...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2009-02, Vol.16 (1), p.77-87
Main Authors: De Lorenzi, A., Grando, L., Pesce, A., Bettini, P., Specogna, R.
Format: Article
Language:English
Subjects:
Computer simulation
Conductivity
Direct current
Disks
epoxy resin insulator
Epoxy resins
Finite element analysis
Finite element methods
Gas insulated transmission lines
Gas insulation
Genetic algorithms
HVDC insulation
Injectors
Kernel
Mathematical models
Neutral Beam Injector
Neutral beams
optimization method
Optimization methods
Packages
Packaging
Spacers
Studies
Surface charging
triple-junction
Voltage
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Summary:The spacers for the gas insulated transmission line for the ITER neutral beam injector will be designed to withstand the operating voltage of 1 MV dc. Electric charging processes of the spacer surface are then expected to play an important role in the final electric field distribution. Aim of the paper is to investigate the effects of the different conductivity properties of the SF6-Spacer insulating structures on the surface charge set-up, and to identify a procedure to minimize this charge. Based on the most updated literature, the paper presents and discusses the results of two newly developed simulation tools: the first consisting of a quasi-static non linear model for epoxy spacer based on finite element method code ANSYStrade, the other consisting of a spacer profile optimization package, whose kernel is based on a genetic algorithm. The numerical tools have been applied to post and disk spacer models of the gas insulated line; in particular, the optimization package has been used on the disk spacer, and the comparison between un-optimized and optimized spacer in terms of electric charge accumulated are presented and discussed.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2009.4784554