Performance of a 1 MV A high temperature superconductors-enabled saturable magnetic core-type fault current limiter

摘要

A 1 MV A single-phase DC saturated iron core-type fault current limiter (FCL) employing DC coils manufactured from Bi-2223/Ag high temperature superconductor has been designed, constructed, and tested. The device, configured to respond to a fault occurring on either the positive or negative wave cycle, exhibited instantaneous reaction and reset times. It could clip a continuous applied steady state fault current of 1200 A, and limited a transient peak fault current of 2200 A to the specified current of 100 A. The operation of the device did not produce any significant harmonic contribution from the clipping action, as under fault conditions, 99.96 percent of the harmonic power spectrum of the clipped waveform contributed to the fundamental, and the non-fault inductance of the FCL was <0.01 mH.