A conceptual design of a superconducting magnetic shield type fault current limiter is made for a 6.6 kv distribution system. The transient behaviors of the impedance is analyzed by taking account of temperature rise in the magnetic shield body after a fault. It is made clear that it turns into almost purely inductive within a few cycles after a fault. An antiresonance experiment is conducted to make the impedance change in quality to purely resistive one, and it is shown that almost pure resistance will be realized by the method. It is also pointed out that the actively controlled MSFCL will function as a high speed variable impedance.
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