Short circuit test performance of inductive high T/sub c/ superconducting fault current limiters
Short circuit test performance of inductive high T/sub c/ superconducting fault current limiters
复制标题
感式高温/超导/超导故障限流器的短路测试性能
DOI：
10.1109/77.402731
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发表时间：
1995
影响因子：
1.8
通讯作者：
J. Cave
中科院分区：
文献类型：
--
作者：
D. Willén;J. Cave
对基于Bi-2212高温超导管的电感式故障限流器的限流性能进行了评价。当超导Bi-2212管中的感应电流超过临界电流时，故障电流限制是由于该装置的非线性阻抗。测试电路中的功率负载首先在标称功率条件（<10 kVA）下操作。然后通过使负载短路来引发故障状况。限制器的电流和电压特性在故障之前和期间被记录。故障电流被限制在标称电流的5-8倍，并且限制总是发生在第一个周期。利用一个近似的Transformer分析，在短路的单匝次级，在超导体中的电流和它的有效电阻得到。超导体的有效电阻率在断层开始时为10 /spl mu//spl Ω/cm的数量级，并随着断层的进展而逐渐增加。的极限阻抗随时间的演变，作为电路的标称电压增加的结果。讨论了这种限流器的材料要求。<<ETX>>
The current limiting performance of inductive fault current limiters based on Bi-2212 high temperature superconducting tubes has been evaluated. Fault current limitation is due to the nonlinear impedance of this device when the induced current in the superconducting Bi-2212 tubes exceeds the critical current. A power load in a test circuit is first operated in nominal power conditions (<10 kVA). A fault condition is then provoked by short circuiting the load. The limiter's current and voltage characteristics are recorded prior to and during the fault. Fault currents are limited to about 5-8 times the nominal current and limitation always occurs in the first cycle. Using an approximate transformer analysis with a shorted single turn secondary, the current in the superconductor and its effective resistance are obtained. The superconductor's effective resistivity is of the order of 10 /spl mu//spl Omega/cm at the onset of a fault and increases gradually as the fault progresses. Results for the evolution of the limiting impedance with time as the nominal voltage of the circuit is increased are presented. The materials requirements for this type of fault current limiter are discussed.<<ETX>>