Speaker
Description
With the development of superconducting technology, high temperature superconducting (HTS) tapes can be mass-produced. With the advantages of high current density, zero resistance in superconducting state and high resistance in normal state, HTS tapes can be used to limit and interrupt fault current as a fuse. However, with the superconducting layer to load normal current, the critical current of HTS tape with half circle or trapezoid restricted zone is lower than HTS tape without restricted zone. The critical current of HTS tape with restricted zone is also unstable, which causes difficulty in the application of superconducting fuse. In this paper, we proposed a new types superconducting fuse with restricted zone manufactured on the stainless-steel layer, which can maintain the critical current of HTS tape and promote the interrupting process with lower heat capacity and higher resistance. An experimental model is established with impact source and HTS tapes with single restricted zone, and the current limiting and interrupting characteristics of the superconducting fuse are tested. Experimental results show that the current limiting ratio of the new superconducting fuse is 20% higher than superconducting tape without restricted zone, and the interrupting time of the new superconducting fuse is 30% shorter than superconducting tape without restricted zone. At the same time, the fusing area of the new superconducting fuse is almost in the restricted zone. With high and stable critical current and excellent interrupting ability, the new superconducting fuse can help to protect high load current grid from short-circuit and improve the stability.
