Experimental investigation on current imbalance of stranded conductors

Multiple-stranded superconducting cable conductors have an essential proble m so called current imbalance phenomenon. Generally, it is said that the cu rrent imbalance problem is caused by the inductance imbalance among strands . However, it does not explain why the inductance imbalance is generated in a symmetrically assembled strand and what is the main factor of current im balance. In such a situation, we have experimentally investigated about the current imbalance problem using several experimental coils. Experimental r esults show that the current imbalance is strongly dependent on the magneti c coupling coefficient among the strands. In addition, it is also shown tha t the inductance distribution between the strands strongly depends on the c abling formation.