Performance test of current lead cooled by a cryocooler in low temperature superconducting magnet system

Choi, Yeon Suk; Kim, Myung‐Su

doi:10.1016/j.physc.2013.04.085

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…Hence, there are virtually no electrical losses in the SFCL during normal operation, yet an SFCL intrinsically inserts impedance into the fault current path during a fault, as long as the transition threshold conditions are satisfied. Nevertheless, the superconductors may experience AC losses[Sta02] (if carrying AC), and there are power losses associated with the operation of the cryogenic system, mainly due to heat loss from the current leads which connect the external power system to the superconducting element(s)[CK13].Several superconductor materials have been used for resistive SFCLs, including Bismuth Strontium Calcium Copper Oxide (BSCCO), Yttrium Barium Copper Oxide (YBCO), and Magnesium Diboride (MgB 2 ). BSCCO is considered a first generation (1G) HTS material, whereas 2G materials such as YBCO offer higher critical current values for a given wire radius, particularly under an external magnetic field, and provide better mechanical stability.…”

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confidence: 99%

Retraction notice to “Analysis of resistive SFCL in a test-bed microgrid” [Ain Shams Eng. J. 6 (2015) 883–892]

Khuntia

Samantaray

2018

Ain Shams Engineering Journal

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Fault current levels in electrical systems are rising due to natural growth in demand, the increasing presence of distributed generation (DG), and increased network interconnection. This rising trend is expected to continue in the future.Marine vessel power systems are highly power-dense and are often safety-critical.Power system protection is increasingly challenging in these systems. Superconducting fault current limiters (SFCLs) offer an attractive solution to many of the issues faced.This thesis establishes and reviews the state of the art in resistive SFCL technology and application knowledge, and provides crucial research-based guidance for the adoption of resistive SFCLs in future power systems.The issues associated with the application of resistive SFCLs-including location, resistance rating, the recovery period, and interaction with protection systems-are demonstrated. The relationship between several resistive SFCL design parameters is established using a generic analytical approach, hence providing a framework for validating SFCL designs. In particular, it is shown that a particular SFCL resistance rating leads to a peak in the superconductor energy dissipation, which generally should be avoided.It is proven that resistive SFCLs have an inverse current-time characteristic, i.e., they will operate in a time that inversely depends upon the initial fault current magnitude. This knowledge is critical for underpinning the operation of a novel protection scheme using multiple resistive SFCLs. The scheme offers several advantages: very fast-acting operation in response to faults anywhere on the system under study; maximum prospective fault currents are prevented from occurring, reducing the duty on circuit breakers; inherent, fast-acting backup; and communications is not required. It is shown that the scheme is suited to highly-interconnected systems with a high presence of DG. The scheme is readily applicable to the design of future utility and marine vessel power systems.

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confidence: 99%