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Superconducting fault current limiter

A technology of fault current and limiter, which is applied in the direction of switchable devices, superconducting magnets/coils, circuits, etc. between superconducting and normal conducting states to achieve the effects of preventing short circuits, reducing cooling time, reducing size and weight

Active Publication Date: 2019-10-22
ROLLS ROYCE PLC
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  • Abstract
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  • Superconducting fault current limiter
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[0029] Superconducting fault current limiters can be implemented in electrical power distribution systems to limit potentially damaging fault currents caused by faults such as short circuits.

[0030] refer to figure 1 , according to an example superconducting fault current limiter (SFCL) 10 includes a cryogenic cooling system 20 . The cryogenic cooling system 20 includes an outer vessel 22 and an inner vessel 24 , wherein the inner vessel 24 is located within the outer vessel 22 . The inner vessel 24 contains a cooling medium 26 capable of reaching a superconducting low temperature suitable for maintaining the superconductor in the superconducting state. For example, cooling medium 26 may be liquid nitrogen and / or liquid helium.

[0031] The outer container 22 is formed of a thermally conductive material such as copper. The outer container 22 can additionally be cooled from the outside. Preferably, outer container 22 has low electrical conductivity at low superconducting ...

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Abstract

A superconducting fault current limiter (10) is shown. It comprises a cryostatic cooling system (20) for containing a cooling medium (26), a superconducting wire (30) immersed in the cooling medium (26) and configured to carry a current, the superconducting wire (30) becoming non-superconducting above a critical current density, and a plurality of heat dissipation elements spaced along and projecting from the superconducting wire (30), wherein the heat dissipation elements have an electrically insulating coating, and whereby the heat dissipation elements transfer heat from the superconductingwire (30) into the cooling medium (26).

Description

technical field [0001] The present disclosure relates to superconducting fault current limiters. Background technique [0002] Fault current limiters can be used to limit potentially damaging fault currents in electrical power distribution systems, especially large scale high power networks such as grid-scale transformers or substations. A fault current is an abnormal current in an electric power distribution system caused by a fault such as a short circuit. Superconducting fault current limiters (SFCLs) limit fault currents by exploiting the fundamental properties of superconductivity, primarily the extremely rapid loss of superconductivity above a critical combination of temperature, current density, and magnetic field strength (called "Quenched"). [0003] In normal operation, when the current density in the SFCL is lower than the critical current density, the superconductor in the SFCL has low impedance and is in a superconducting state. To maintain a superconductor i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02H10N60/30
CPCH02H9/023Y02E40/60H10N60/30H01F6/02H01F2006/001
Inventor C.J.帕尔默S.M.赫斯本德
Owner ROLLS ROYCE PLC
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