The design and testing of a cooling system using mixed solid cryogen for a portable superconducting magnetic energy storage system

GdBCO single-pancake coils wound with Kapton insulation every 3, 6, 9 turns, and without insulation, were characterized by charge–discharge and over-current tests. The magnetic field saturation at higher currents than the critical current was affected by the portion of the insulated turns that restricted the surplus current flow away from the azimuthal current path. The charge–discharge delay decreased with the increase of the portion of the insulated turns, which suggested that partial insulation winding may be effective for use in HTS power applications. Magnetic field loss of the coils with reduced insulation at excessive high currents was mainly affected by the decrease in ampere-turns due to the electrically shorted-circuits between the non-insulated turns, which resulted in the over-current flow bypass through the turn-to-turn contacts.

Section: Charge-discharge Delaymentioning

confidence: 99%

The effects of partial insulation winding on the charge–discharge rate and magnetic field loss phenomena of GdBCO coated conductor coils

Choi

Kim

Kwon

et al. 2012

“…The thermal stabilities can be greatly enhanced for coils without requiring any complicated protection against quenching. Such an arrangement may be of benefit to most DC HTS devices, if their charge-discharge time constants are not important, though this technique is less suited to power devices, such as superconducting magnetic energy storage systems (SMESs), which require fast discharges of stored energy (<1 s) [3][4][5][6][7][8][9][10][11]. To improve the slow charging and discharging of coils without insulation, this study introduces a variation of the completely insulation-free winding: partial insulation with insulation every five turns.…”

Section: Introductionmentioning

confidence: 99%

Partial insulation of GdBCO single pancake coils for protection-free HTS power applications

Choi

Hahn

Song

et al. 2011

Self Cite

The partial insulation winding was examined to ameliorate the slow charge–discharge shown by coils wound without insulation. Single pancake coils of GdBCO coated conductor were wound without insulation, with kapton tape every five turns, and with the full use of kapton tape. They were characterized by charge–discharge, sudden discharge, and over-current testing. The improved charging and discharging and high thermal and electrical stabilities of the partially insulated coil demonstrate its potential for use in HTS power applications.

“…Similarly, it can maintain the SC state of the magnet in case of a power outage. The high heat capacity could also be leveraged for portable magnets, such as a SMES system [103] or a magnetohydrodynamically powered model boat [104,105].…”

Section: Solid Cryogensmentioning

confidence: 99%

Review of materials for HTS magnet impregnation

Feldman,

Stautner,

Kovacs

et al. 2024

Construction of high-temperature superconducting magnets typically involves impregnation of a coil in a liquid medium, such as epoxy, which is then solidified. This impregnation provides mechanical integrity to the magnet and facilitates heat transfer. The choice of material used for impregnation requires careful consideration of the material properties and the performance requirements in order to ensure optimal magnet operation. This paper offers a comprehensive educational resource on this topic, reviewing the literature available on materials for magnet impregnation. A detailed explanation of considerations for selecting an impregnation material are presented, along with a review of several types of materials and their characteristics as reported in the literature. The materials are compared, and their suitability to different applications is discussed. Topics for future research are suggested.