진공도에 따른 절연파괴 분석에 관한 연구 = A Study on Electrical Insulation Breakdown Analysis Depending on Vacuum Degree

다국어 초록 (Multilingual Abstract)

This study focuses on investigating the dielectric breakdown characteristics of high-temperature superconducting (HTS) coils, which are increasingly used in various applications such as superconducting cables, superconducting fault current limiters (SFCLs), and superconducting particle accelerators. The research aims to understand how electrical breakdown, induced by high electromotive force and local quenching, can weaken the dielectric stability of HTS magnets. The dielectric experiments were conducted under different vacuum conditions and gaseous helium conditions, and an empirical formula for the electrical insulation design of HTS magnets was developed. Finite element method (FEM) analysis was also performed to simulate various conditions that may cause electrical breakdown, confirming that breakdown could occur at turn-to-turn and layer-to-layer of HTS magnets. As a result, it was confirmed that the magnitude of the induced electromotive force or quench voltage that could cause electrical breakdown of the HTS magnets under various insulating medium conditions such as gaseous nitrogen (GN2), gaseous helium (GHe), and vacuum was deduced.

참고문헌 (Reference)

1 D. Kwon, "Quench Phenomena in a Conduction-Cooled Fast-Ramping High Temperature Superconducting Magnet" 30 (30): 1-6, 2020

2 C. Reis, "Investigating Irradiated Superconducting Magnet Insulation Materials for Particle Accelerators and other High-Dose Environments" 2023

3 Z. Melhem, "High Temperature Superconducting (HTS) Coils for a Compact Spherical Tokamak" 25 (25): 1-4, 2015

4 Z. Zhang, "Experimental Study on Vacuum Control Method for Paschen Tests of the Superconducting Magnet Mockup" 27 (27): 1-4, 2017

5 H. Chen, "Development of a Bi-2212 Solenoid Insert Coil in a 12 T Superconducting Magnet" 31 (31): 1-4, 2021

6 Z. Yue, "Design and Magnetic Field Simulation of 3.0T MRI Superconducting Magnet" 29 (29): 1-6, 2019

7 J. Zhu, "Design and Evaluation of a Novel Non -Inductive Unit for a High Temperature Superconducting Fault Current Limiter (SFCL) with Bias Magnetic Field" 29 (29): 1-4, 2019

8 J. Hong, "Analysis on the Dielectric Characteristics of Soild Insulation Materials in LN2 for Development of High Voltage Magnet Applications" 24 (24): 1-4, 2014

9 X. Hu, "Analysis of Local Burnout in a Sub-scale test coil for the 32 T Magnet after Spontaneous Quenches during Fast Ramping" 35 (35): 2022

10 B. Shen, "A Novel All-Superconducting Propulsion and Protection System for the HTS Maglev: Concept, Experimental Verification and Planning" 29 (29): 1-5, 2019