Hybrid electric aircraft requires high power density for power transmission, which makes the ReBCO conductor-on-round-core (CORC) cable a powerful candidate for the transmission line used in the hybrid-electric aircraft. However, quenching remains one of the biggest challenges in the development of CORC cable, for it can significantly influence the thermal stability and safety of the CORC cable. The quench behaviour of CORC cable is quite different with single tapes due to the influence of terminal joint resistance and inductance, which has to be elucidated in detail.
This work presents the results of a numerical and experimental investigation on the quench behaviours of two typical CORC cable models with multi-layer structure. Each layer of the first cable (Cable A) was consisted of only one ReBCO tape and was wound into 3 layers, while the second cable (Cable B) was a two-layer CORC cable with three ReBCO tapes in each layer. A heater was induced on the central area of the cables to generate pulses. Hotspot induced quenches were studied by calculating the current redistribution among tapes, voltage of each tape, minimum quench energy (MQE) and normal zone propagation. Influences of the inductances and terminal joint resistances on the thermal stabilities were analysed and discussed. Quench detection and protection measures were proposed.