Viable Superconductor-Based Current Control Circuit for High Current Injection System

This paper explains novel methods of the excessive current protection for a single unit 25-kA current injection system (CIS) with no test interruption. The principle object of this paper is to provide a fast detection of excessive current in the system by means of an unbalanced magnetic flux current limiting device (CLD) for the predetermined current tests. The proposed techniques will be used to investigate the performances of different CLD core structures. The paper will also push the state of the art by applying magnetic fields to the high-temperature superconductor element through an external source, to get higher resistance in the current-limiting phase. A further object of this investigation is to provide the use of open-core in two different mechanisms for limitation and protection purposes of the CIS. This can be considered as a viable alternative CLD for applications in the power industry. This will result in a more thorough knowledge of ldquoscaling factorsrdquo and the excessive current limitation mechanism which will enable the most efficient limitation in terms of compactness and cost to be specified. Completion of this development will mark an important milestone in superconductor technology, and significant efficiency improvement will be realized.