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RISS 인기검색어
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- 저자 : 권기일(G. K. Kwon) (검색결과 1 건)
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이현정(Hyunjung Lee),김현욱(Hyunwook Kim),권기일(G. K. Kwon),추용(Young Chu),김광표(K. P. Kim),박갑래(K. R. Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The KSTAR superconducting coil has been operated for more than a decade since 2007, and analysis of AC losses characteristics of superconducting magnet experiments have been conducted annually for safety and estimate of life. A total of 30 superconducting magnets are installed in the KSTAR tokamak, especially for PF1UL to PF7UL of cable in conduit conductors are operating in AC mode and are generated AC losses such as a hysteresis loss, a coupling loss, an eddy current loss, etc. Hence, AC losses measurements were performed on PF1UL magnets with the largest and highest current with a high ramping rate among coils annually and an enthalpy method using for AC losses analysis. Experiments were performed on PF 1UL magnets for different ramping rates at 4 kA and 15 kA. The hysteresis loss at the same current is constant nearly and the coupling loss increases from 0.15 kA/s to 4 kA/s in proportion to the ramping rate. The coupling loss is proportional to the square of the magnetic field variation, and as the ramping rate approaches zero, the hysteresis loss is predicted to dominate. However, a sudden increase in loss occurred below 0.5 kA/s. An AC waveform of the current was observed. Therefore, in this paper, we would clarify the hysteresis loss of the KSTAR PF1UL magnets by numerically separating the loss caused by the AC waveform from the low ramp rate.
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