Electrical Insulation Testing for CFETR CS Model Coil

Ma, Yuanyuan; Han, Houxiang; Jin, Huan; Yin, Di; Wu, Yu; Liu, Huajun; Hu, Yanlan

doi:10.1109/tasc.2021.3052447

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…Breakdown of coil insulation under the coupling effects of high magnetic field and strong electric field will cause significant economic losses and hinder the development of controllable nuclear fusion technology [4], [10]. According to technical standards, the processed coil insulation shall pass DC and AC tests [11], [12], without considering the effects of high magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe₃ O₄ Nanocomposites in High Magnetic Field

Wang¹,

Zhang²,

Xue³

et al. 2023

IEEE Access

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High magnetic field causes premature failure of insulation. In order to improve the breakdown strength of silicone rubber (SiR), different filler contents of ferroferric oxide (Fe3O4) nanoparticles were added. Experimental results show that 1 wt% addition amount of ferromagnetic nanoparticles is beneficial to improve the AC breakdown strength of SiR by 5.40% in 12 T magnetic field due to their ability to regulate dielectric polarization and partial discharge (PD) behavior, resulting from the relative higher permittivity and permeability of Fe3O4. Magnetization of Fe3O4 nanoparticles results in 3.33% decrease of DC breakdown strength with 2 wt% filler content in 12 T magnetic field. Fluorination treatment was carried out and proved to be able to improve the DC breakdown strength of SiR/Fe3O4 nanocomposites by 8.84% in 12 T magnetic field with the treatment time being 5 minutes, resulting from the regulation of surface traps. Fluorination treatment weakened the magnetism of nanoparticles, weakening their regulation on insulation polarization and PD. Adding an appropriate amount of ferromagnetic nanoparticles before the fluorination of SiR/Fe3O4 nanocomposites can improve the AC and DC breakdown strength by 0.64% and 8.81% respectively at the same time in high magnetic field.

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Section: Introductionmentioning

confidence: 99%

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe₃ O₄ Nanocomposites in High Magnetic Field

Wang¹,

Zhang²,

Xue³

et al. 2023

IEEE Access

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show abstract

“…The design value of the toroidal magnetic field of ITER (International Thermonuclear Experimental Reactor) reaches 5.3 T [4]. The insulation of magnet coils plays an important role in electrical isolation and mechanical support, and its reliability under the operating state is related to the safe and stable operation of the device [5], [6], [7]. During the operation of Tokamak devices, the magnet coil insulation is in the condition with high magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Electrical Treeing and Its Suppression Method of SiR in High Magnetic Field

Wang¹,

Yin²,

Wang³

et al. 2023

IEEE Access

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This paper investigates the effects of high magnetic field on electrical treeing of silicone rubber (SiR). Experimental results show that electrical trees are more easily to be initiated and spread further along the direction of electric field under the effects of high magnetic field. When the direction of high magnetic field is perpendicular to that of electric field, magnetic field with higher magnetic flux density also results in larger accumulated damage area. Splitting of energy band structure and changes in polarization characteristics result in a lower interface barrier and more serious partial discharge, thus causing the weakened resistance to electrical treeing in high magnetic field. Based on the insulation degradation mechanism, SiR was modified by adding ferroferric oxide (Fe 3 O 4 ) nanoparticles to improve its insulation performance in high magnetic field. Moderate addition amount of Fe 3 O 4 nanoparticles is proved to be able to suppress electrical treeing in high magnetic field by forming quantum dots, modifying polarization properties and partial discharge behavior. Excessive addition of Fe 3 O 4 nanoparticles has negative effects on suppressing electrical treeing due to the magnetization of the nanocomposites.INDEX TERMS Magnetic field, electrical tree, nanocomposites, quantum dot.

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Electrical Insulation Testing for CFETR CS Model Coil

Cited by 2 publications

References 12 publications

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe₃ O₄ Nanocomposites in High Magnetic Field

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe₃ O₄ Nanocomposites in High Magnetic Field

Electrical Treeing and Its Suppression Method of SiR in High Magnetic Field

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Electrical Insulation Testing for CFETR CS Model Coil

Cited by 2 publications

References 12 publications

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe3 O4 Nanocomposites in High Magnetic Field

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe3 O4 Nanocomposites in High Magnetic Field

Electrical Treeing and Its Suppression Method of SiR in High Magnetic Field

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Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe₃ O₄ Nanocomposites in High Magnetic Field

Effects of Ferromagnetic Nanoparticles and Fluorination on Breakdown of SiR/Fe₃ O₄ Nanocomposites in High Magnetic Field