Contactless electrical measurements of transport AC losses in a 3 m long superconducting cable
Contactless electrical measurements of transport AC losses in a 3 m long superconducting cable
复制标题
对 3 m 长超导电缆中的传输交流损耗进行非接触式电气测量
DOI：
10.1088/0953-2048/15/6/310
复制
发表时间：
2002
影响因子：
3.6
通讯作者：
O. Tønnesen
中科院分区：
文献类型：
--
作者：
C. Træholt;E. Veje;F. Gömöry;M. Daumling;O. Tønnesen
使用两对电压抽头（四探针测量）记录的常规电压信号，对一根3米长的高温超导（HTS）电缆导体在77K下的交流传输损耗进行了电学测量。此外，还使用了来自两个非接触式拾取线圈的信号。非接触式线圈与电缆外常规电压抽头的布线放置在同一路径上，而返回路径穿过前一个导体的中心，从而环绕所有超导层。通过这种布置，可以分离出高温超导电缆交流传输损耗的磁性部分。测量结果证实，在电流\(I\)远低于电缆的临界电流\(I_c\)（\(I\ll I_c\)）时，损耗主要由磁损耗主导，而在电流高于\(I_c\)时，磁损耗趋于平稳，电阻损耗成为主导。
The ac transport losses at 77 K of a 3 m long high-temperature superconducting (HTS) cable conductor were measured electrically using the conventional voltage signals recorded by two pairs of voltage taps (four probe measurements). Further, the signals from two contactless pick-up loops were employed. The contactless loops were placed on the same path as the wiring of the conventional voltage taps outside the cable, whereas the return path went through the centre of the former conductor, thereby encircling all of the superconducting layers. By this arrangement the magnetic part of the ac transport losses of the HTS cable could be singled out. The measurements confirmed that at currents, I, far below the critical current, Ic, of the cable (I Ic) the losses are dominated by magnetic losses and above Ic the magnetic losses level off and resistive losses become dominating.