Thermal quench study in HTSC pancake coil

Development of Ultra-Efficient Electric Motors Final Technical Report Covering work from April 2002 through September 2007

“…The value of I q is a system characteristic of the superconducting device including the cooling system. It was introduced in [13][14][15][16][17][18] and called the quench current. The second mechanism will be referred to as a thermally induced quench which happens at constant current due to a malfunctioning of the cooling system which could be due to refrigerator failure, vacuum problems and so on.…”

“…The breakthrough in this project was started when we ran across a series of publications [13][14][15][16][17][18]. The research in these publications spanned about 4 years and was based on a significant number of experiments on quench of HTS coils.…”

“…The major results of this work were summarized in the review [18]. The publications [13][14][15][16][17][18] provided a solid foundation for quench detection and protection in HTS devices.…”

“…One of the most surprising results of [13][14][15][16][17][18] was that the one-degree-of-freedom-model provided good correlation with experimental data. The model was based on the assumption that the temperature is uniform across the whole coil.…”

“…A single value of critical current was assumed for the whole coil. For some of the experiments in [13][14][15][16][17][18] these assumptions were approximately correct, but for the others they were not. For…”