Abstract
A single pancake coil without turn-to-turn insulation was tested in this paper to investigate the transient responses under different situations. We performed charging and discharging test, AC current test, and regional quench emulation test on the non-insulated (NI) coil. The experimental test results show a significant time delay for charging and discharging characteristics of NI coil and can be validated by a simple proposed equivalent electrical circuit. Under the AC operating current, the NI coil can bypass nearly all the AC current from the coil spiral path to the radial path such that it is not possible for NI coil to store or be affected by the AC magnet field. Additionally, while carrying AC current, the AC loss dissipation of NI coil is inversely proportional to the frequency of the AC operating current. When a regional quench occurs, the NI coil can bypass the current in the regional quench zone to avoid further temperature accumulated and protect the NI coil itself.
Highlights
Proposed in 2011, researchers have shown great interest to the non-insulation (NI) coil due to its superior performances over traditional insulated (INS) coils [1]
The NI coil has quite different electrical characteristics compared with its counterpart INS coil, which motivates the authors to investigate the transient response of the NI coil in order to develop an effective protection algorithm for HTS magnet coil
This paper presents an experimental investigation on the dynamic responses on the NI coil under the different electrical transient states: charging and sudden discharging tests, AC current tests, and quench test
Summary
Proposed in 2011, researchers have shown great interest to the non-insulation (NI) coil due to its superior performances over traditional insulated (INS) coils [1]. The time constant of the proposed NI coil will be obtained from the experimental DC ramping current test and further verified by a simple electrical circuit. Even if the superconducting magnet is charged with DC, there still exist AC losses generated from the AC ripple current offset by DC operating current. This part of dissipated heat should be carefully removed. In this paper, a local quench test can provide a novel method to prove that the thermal stability of NI coil is superior to the INS coil
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