Active Quenching Technique for YBCO Tapes: Quench Acceleration and Protection

Abstract

The application of resistive-type superconducting fault current limiters (RSFCLs) in electrical networks is very attractive due to their relative compactness, light weight, and good performance. However, this technology still has drawbacks: asymmetrical quench, uncertain limiting velocity, passive action and incapability of enlarging capacity. Here, we present an active quenching technique which can potentially solve these problems. The quenching process is triggered using highfrequency (HF) AC fields, which are generated by two coupled copper coils attached on both sides of the YBCO sample. Our experiments show that this approach is effective in guaranteeing uniform quench and therefore is expected to be able to significantly extend the service life of the device. Moreover, the quench speed can be considerably increased by the HF field. We find that the performance of acceleration is positively correlated to the transport current, intensity and frequency of the AC field. In addition, a DC magnetic field is added around the sample holder simultaneously with the AC field, to study the field-angular-frequency dependence of the quench time t (B AC f AC B DC θ DC ). Experimental results prove that the DC magnetic field can cooperate with the HF AC field to accelerate quench, which means better performance can be produced with lower costs with the two fields acting together. In all, this technique showed outstanding performance regarding quench acceleration and tape protection. We believe the HF-assisted quenching technology has a promising future in current-limiting devices and hope our findings could be helpful for its potential applications.

High precision particle astrophysics as a new window on the universe with an Antimatter Large Acceptance Detector In Orbit (ALADInO)

“…At present, commercial ReBCO can be operated at 400 A/mm 2 at 30 K in a 3 T field. Recent developments indicate that the current density can be pushed to 2000 A/mm 2 in the next years [135]. The use of magnesium diboride wires, despite its poorer current properties, is also a possible option, due to the low average mass density [136,137].…”

“…A toroidal configuration is proposed for the magnet of ALADInO. Advantages and limitations of this solution were discussed within the SR2S project, with the purpose of shielding astronauts from space radiation [139,140,135]. More recently, the concept and the technology for an HTS magnet to be used in a space spectrometer have been developed within the HDMS project [141].…”

Fabrication and characterization of coated Hastelloy C-276 Alloy by SDP technology

“…IBAD technique involves deposition of biaxial textured transition on non-textured metal substrate before the deposition of YBCO superconducting layer. Hastelloy C-276 alloy is considered as a potential substrate material due to its excellent mechanical properties and non-ferromagnetic nature [6][7][8][9][10]. Hastelloy C-276 alloy with Ra<5 nm (5 μm×5 μm) is usually required for the best outcome of any material [11][12][13][14][15].…”