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Improvement of Current Limiting Device Consisting of Thin Film Superconductor with Thermal and Magnetic Effect

热磁效应薄膜超导体限流装置的改进

基本信息

批准号：
15360142
负责人：
ONISHI Toshitada
金额：
$ 5.44万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360142/
关键词：
Superconducting Fault Current Limiter YBCO Thin Film Normal Transition Quench Superconductivity Recovery E-J Characteristics Pulsed Magnetic Field 超伝導薄膜限流器 EJ特性 YBCO超伝導体均質常伝導転移超伝導体破壊

项目摘要

There are strong needs for fault current limiters in order to establish a reliable and flexible power distribution/transmission system. A magnetic shield type superconducting fault current limiter is thought to be one of the promising candidates for application to 6.6 kV power line. The authors have proposed and developed a high-performance magnetic shield type fault current limiter before. Recently, however, the fault current limiters of 66 kV class are being strongly required from the utility side and accordingly, the high performance fault current limiters composed of YBCO thin film are under research and development in the world. The critical current density of YBCO thin film, J_c amounts to the value as large as 3x10^6 A/cm^2 or more at 77 K and self field. Although the thin film of such a high J_c is expected to exhibit a quick transition to a normal state provided that a current of a few times J_c will flow in the film and hence exhibit the excellent current limiting characteris … More tics at a fault, the hot spot problem may occur and lead to the damage of the film. In the present study, the various characteristics such as a quick S/N transition was studied in order to establish the design criteria for a fault current limiter composed of YBCO thin film. We proposed an advanced fault current limiter in which the superconducting film will be actively quenched by applying a pursed magnetic field of the pulse width of 1〜2ms to it automatically when a fault occurs. The transient behaviors from the onset of S/N transition to quenching and the current limiting characteristics were studied by using the proposed fault current limiter. And the requirements for the homogeneous S/N transition over the whole film area were clarified. The computer codes simulating such a transient behavior was also developed and the various characteristics such as current limiting ones, superconducting recovery and so on were analyzed. In consequence, the design criterion for a high performance fault current limiter was developed. Less

为了建立可靠、灵活的配电/输电系统，对故障限流器有着强烈的需求。磁屏蔽型超导故障限流器被认为是应用于 6.6 kV 电力线的有希望的候选者之一。作者之前提出并开发了一种高性能磁屏蔽式故障限流器。但近年来，电网侧对66kV级故障限流器的需求日益强烈，相应地，国际上正在研发由YBCO薄膜构成的高性能故障限流器。 YBCO薄膜的临界电流密度J_c在77K和自磁场下达到3x10^6A/cm^2或更大的值。虽然如此高J_c的薄膜在薄膜中流过几倍J_c的电流的情况下有望快速过渡到正常状态，从而在故障时表现出优异的限流特性，但可能会出现热点问题并导致薄膜损坏。在本研究中，研究了快速 S/N 转变等各种特性，以便建立由 YBCO 薄膜组成的故障限流器的设计标准。我们提出了一种先进的故障限流器，当故障发生时，通过向超导薄膜施加脉冲宽度为1〜2ms的扫频磁场来主动淬灭超导薄膜。使用所提出的故障限流器研究了从 S/N 转变开始到失超的瞬态行为以及限流特性。并明确了整个薄膜区域均匀信噪比过渡的要求。还开发了模拟这种瞬态行为的计算机代码，并分析了限流、超导恢复等各种特性。因此，开发了高性能故障限流器的设计标准。较少的