Superconducting fault-current limiting element and the process for producing the same
AssigneeNational Institute of Advanced Industrial Science and Technology
InventorsHirofumi Yamasaki, Mitsuho Furuse
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Abstract
To prepare a superconducting fault-current limiting element having a high sharing electric field at low cost, a superconducting fault-current limiting element includes an insulator substrate; a superconductive thin film formed on the insulator substrate; and an alloy layer formed on the superconducting thin film, said alloy layer having a room-temperature resistivity higher by twice or more than the room-temperature resistivity of a pure metal, in which, when the superconducting thin film goes into a normal conductive state by an overcurrent, the overcurrent flowing through the superconducting thin film is transferred only to the alloy layer.
Claims8
A superconducting fault-current limiting element comprising:
- a sapphire substrate;
- a buffer layer;
- a superconducting thin film;
- and
- an alloy layer formed on the superconducting thin film, said alloy layer having a room-temperature resistivity higher by twice or more than the room-temperature resistivity of pure gold,
- wherein
- when the superconducting thin film goes into a normal conductive state by an overcurrent, the overcurrent flowing through the superconducting thin film is transferred only to the alloy layer;
- the superconducting thin film is made of a high temperature superconducting oxide YBCO thin film;
- and
- the alloy layer consists of gold and silver mixed by 7 to 82 wt % therewith.
A superconducting fault-current limiting element comprising:
- a sapphire substrate;
- a buffer layer;
- a superconducting thin film;
- and
- an alloy layer of silver and gold formed on the superconducting thin film, said alloy layer having a room-temperature resistivity higher by twice or more than the room-temperature resistivity of pure gold,
- said superconducting fault-current limiting element further comprising a shunt resistor made of a pure metal wire or an alloy wire, and
- said shunt resistor being connected in parallel with the superconducting thin film,
- wherein the superconducting thin film is made of a high temperature superconducting oxide YBCO thin film;
- and
- the alloy layer consists of gold and silver mixed by 7 to 82 wt % therewith.
Dependencies are inferred from the claim text.