NDLI: Methods to Increase Current Capacity of Superconducting Thin-Film Fault Current Limiter Using Au-Ag Alloy Shunt Layers

Content Provider	IEEE Xplore Digital Library
Author	Arai, K. Yamasaki, H. Kaiho, K. Nakagawa, Y. Sohma, M. Kondo, W. Yamaguchi, I. Kumagai, T.
Copyright Year	2002
Abstract	We have proposed a superconducting thin-film fault current limiter (FCL) that uses high-resistivity Au-Ag alloy shunt layers for the protection against ldquohot spotsrdquo. Its design enables reduction of the total length of FCL elements that can withstand high electric fields E > 40 V_peak/cm, thus greatly reducing the cost of FCLs. In this paper, two methods to increase current capacity of the FCLs were demonstrated. The first method protects the films from hot spots by using capacitors in addition to external resistors. The capacitors decrease rapid voltage rise in the films at the moment of quenching. The second method maximizes the rated current of two parallel-connected thin films by using parallel connections via superconducting tapes, even if the critical currents of these films are largely different. We then successfully tested two parallel-connected YBCO films prepared by a low-cost, metal organic deposition (MOD) method. Over-current tests showed that (a) superconducting transport currents up to 380 A_peak flowed 5 cycles without quenching, which is more than 1.3 times larger than the peak value of the 200 A_rms rated current and (b) after switching, E = 45.7 V_peak/cm was achieved without film degradation.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1863
Ending Page	1867
Page Count	5
File Size	1013272
File Format	PDF
ISSN	10518223
Volume Number	19
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting epitaxial layers Superconducting materials Superconducting thin films Fault current limiters Superconducting films Protection Capacitors Testing Costs Resistors YBCO thin films Au-Ag alloy shunt layers current capacity electric fields fault current limiters
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Temperature Characteristics of Superconducting Thin-Film Fault Current Limiting Elements Using High-Resistivity Alloy Shunt Layers

Current Limiting Properties of MOD-YBCO Thin Films Stabilized With High-Resistivity Alloy Shunt Layer

Superconducting Fault Current Limiter Design Using Parallel-Connected YBCO Thin Films

Operating Property Analysis of Parallelized Resistive Fault Current Limiter Using YBCO Thin Films

Inductive Fault Current Limiters: Kinetics of Quenching and Recovery

Tests for Conceptual Design of 6.6 kV Class Superconducting Fault Current Limiter With YBCO Thin Film Elements

Operating Performance of the Flux-Lock and the Transformer Type Superconducting Fault Current Limiter Using the YBCO Thin Films

Performance verification of a practical fault current limiter using YBCO thin film

6.6 kV resistive superconducting fault current limiter based on YBCO films

Methods to Increase Current Capacity of Superconducting Thin-Film Fault Current Limiter Using Au-Ag Alloy Shunt Layers

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Temperature Characteristics of Superconducting Thin-Film Fault Current Limiting Elements Using High-Resistivity Alloy Shunt Layers

Current Limiting Properties of MOD-YBCO Thin Films Stabilized With High-Resistivity Alloy Shunt Layer

Superconducting Fault Current Limiter Design Using Parallel-Connected YBCO Thin Films

Operating Property Analysis of Parallelized Resistive Fault Current Limiter Using YBCO Thin Films

Inductive Fault Current Limiters: Kinetics of Quenching and Recovery

Tests for Conceptual Design of 6.6 kV Class Superconducting Fault Current Limiter With YBCO Thin Film Elements

Operating Performance of the Flux-Lock and the Transformer Type Superconducting Fault Current Limiter Using the YBCO Thin Films

Performance verification of a practical fault current limiter using YBCO thin film

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Methods to Increase Current Capacity of Superconducting Thin-Film Fault Current Limiter Using Au-Ag Alloy Shunt Layers