In high power application, the fault current limiter has been discussed for many years because of some limitations of conventional circuit breaker. Many types of fault current limiter have already been introduced in papers. In this work, a simple bridge type fault current limiter has been designed and constructed. The performances of the limiter have been tested successfully. In bridge type current limiter, DC reactor appears in the line when connected load is increasing. This causes voltage drop across the load terminal during load changing. The DC reactor effect of the current limiter has been studied. Some experimental results regarding reactor effect of the limiter have been considered and were compared with the results obtained from computer simulation. Kegwords-Superconductor, fault current limiter, bridge type, dc reactor.
A rectifier type superconducting fault current limiter with noninductive reactor has been proposed by the authors. The concept behind this SFCL is that the high impedance generated during superconducting to normal state of the trigger coil limits the fault current. In the hybrid bridge circuit of the SFCL, two superconducting coils: a trigger coil and a limiting coil are connected in anti-parallel. Both the coils are magnetically coupled with each other and could have the same value of self inductance so that they can share the line current equally. At fault time when the trigger coil current reaches a certain level, the trigger coil changes from superconducting state to normal state. This super to normal transition of the trigger coil changes the current ratio of the coils and therefore the flux inside the reactor is no longer zero. So, the equivalent impedance of both the coils is increased and limits the fault current. We have carried out computer simulation using PSCAD/EMTDC and observed the results. Both the simulation and preliminary experiment shows good results. The advantage of using hybrid bridge circuit is that the SFCL can also be used as circuit breaker.
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