An Experimental Study on the Dynamic Resistance of HTS Coil During Quasi-Persistent Current Operation Under External Harmonic Magnetic Field

Implementation of the persistent current mode (PCM) provides an effective solution for mitigating thermal load on superconducting magnets used in maglev trains and addressing external power supply issues. However, the HTS magnet is affected by harmonics by the armature coil during running operation. Notably, the dynamic resistance by the external time-varying magnetic field under the DC transport current generates additional AC loss. This must be considered during the design of a quasi-persistent current switch (quasi-PCS) as it causes additional field attenuation and thermal loss. This paper describes the characteristics of field attenuation of HTS magnet of lab-scale with the quasi-PCS due to the dynamic resistance for DC transport currents condition under various external AC field by experiments and numerical analysis.