Universal scaling law for quench development in HTSC devices

Adiabatic Normal Zone Development in<tex>$rm MgB_2$</tex>Superconductors

“…We assume that the voltage-current relation of the superconducting filaments can be described by a power law (1) and define the electrical field and current density as the point where dissipation in the superconducting and normal conducting state become equal (2) Considering the same temperature increase as before, the voltage in the filaments is already rising well before meets the transport current (see Fig. 2).…”

“…A fast normal zone development creates a large area where stored energy is dissipated, limiting the hot spot temperature, and it makes it easier to detect the existence of a normal zone. The development of the normal zone depends on the operating current, on the steepness of the voltage-current characteristic, on current-and heat diffusion and finally on the temperature margin [1], [2].…”

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.…”