Current limiting characteristics of superconducting fault current limiter with parallel and series connection in experimental power system

摘要

A trial three-phase SCFCL with adjustable trigger current level was proposed and fabricated. Current limiting characteristics of the SCFCL with parallel and series connection using two of the three-phase SCFCLs was investigated experimentally in a model power system consisting a small synchronous generator and an artificial parallel transmission lines. The pair of the SCFCL was installed in one of three phases of the fault line. The fault current limiting characteristics of the pair of SCFCL at one line grounded (1 LG) fault was studied with various fault phases. In every test case, the SCFCL limited the fault current below a certain level. In the series-connection cases, which one or both of the pair of SCFCLs turn into the current limiting mode can be controlled by calibrating the trigger current level of each SCFCL. It was observed that it depends on the fault phase. In the parallel connection cases, both of the pair of SCFCLs turn into current limiting mode nearly simultaneously in every fault phase.