Estimation of Overcurrent Performance in YBCO Superconducting Thin Films for Fault-Current Limiter
Estimation of Overcurrent Performance in YBCO Superconducting Thin Films for Fault-Current Limiter
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DOI：
10.1109/tasc.2010.2089399
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发表时间：
2011-06
影响因子：
1.8
通讯作者：
M. Yasuda;Y. Guan;T. Kawahara;Y. Yokomizu;T. Matsumura
中科院分区：
文献类型：
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作者：
M. Yasuda;Y. Guan;T. Kawahara;Y. Yokomizu;T. Matsumura
超导故障电流限制器(SFCL)有望用于防止分散发电机电力系统扩展引起的故障电流增加。在这项研究中，我们以金属有机沉积(MOD)方法制备的YBCO超导薄膜为研究对象，提出了一种计算YBCO元件在过电流作用下产生的电阻的方法。根据在YBCO元件上进行的过电流实验测得的电压和电流波形，提出了一种计算YBCO元件与Au-Ag保护金属涂层并联的SFCL过电流性能的近似方法。结果表明，用该方法可以近似计算出并联元件的电流分布。此外，对热传导现象进行了试探性的数值分析，以估算YBCO薄膜元件的电阻和温度分布对过电流注入的瞬时响应。
Superconducting fault-current limiters (SFCLs) are expected to be useful for preventing increases in the fault currents caused by the expansion of power systems with dispersed generators. In this study, we focus on resistance-type SFCLs with YBCO superconducting thin films fabricated by the metal-organic deposition (MOD) method and propose a computational approach to calculate the resistance generated in YBCO elements in response to overcurrents. An approximate method for calculating the overcurrent performance of an SFCL, which consists of parallel-connected YBCO elements with an Au-Ag protective metal coating, is developed on the basis of the voltage and current waveforms measured in overcurrent-carrying experiments performed on each YBCO element. It is confirmed that the current distributions for the parallel-connected elements can be approximately calculated by this method. In addition, a trial numerical analysis of the heat conduction phenomena is performed to estimate the transient response of the resistance and temperature profiles of YBCO thin film elements to overcurrent injection.