Open AccessTurn-to-turn contact characteristics for an equivalent circuit model of no-insulation ReBCO pancake coil
Author(s) -
Xudong Wang,
Seungyong Hahn,
Young Jae Kim,
Juan Bascuñán,
John Voccio,
Haigun Lee,
Y. Iwasa
Publication year - 2013
Publication title -
superconductor science and technology/superconductor science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.033
H-Index - 105
eISSN - 1361-6668
pISSN - 0953-2048
DOI - 10.1088/0953-2048/26/3/035012
Subject(s) - materials science , electromagnetic coil , turn (biochemistry) , equivalent circuit , contact resistance , current (fluid) , mechanics , tension (geology) , spiral (railway) , acoustics , composite material , electrical engineering , voltage , nuclear magnetic resonance , mechanical engineering , physics , layer (electronics) , ultimate tensile strength , engineering
This paper presents experimental and analytical studies on the characteristic resistance of NI (no-insulation) ReBCO pancake coils, which are used in an equivalent circuit model to characterize 'radial as well as spiral' current paths within the NI coils. We identified turn-to-turn contact resistance as a major source of the characteristic resistance of an NI coil. In order to verify this, three single pancake NI HTS coils-60, 40, 20 turns-were fabricated with their winding tension carefully maintained constant. A sudden discharge test was performed on each coil to obtain its characteristic resistance, and the relation between the turn-to-turn contact and the characteristic resistance was investigated. Based on the characteristic resistance and the n -value model, an equivalent circuit model was proposed to characterize the time-varying response of the NI coils. Charging tests were performed on the three test coils and the experimental results were compared with the simulated ones to validate the proposed approach with the equivalent circuit model.