Frequency dependence of self-field AC losses in Bi-2223/Ag tapes

被引：10

作者：

Paasi, J ^{[1
]}

Masti, M ^{[1
]}

Lehtonen, J ^{[1
]}

Kalliohaka, T ^{[1
]}

机构：

[1] Tampere Univ Technol, Electromagnet Lab, FIN-33101 Tampere, Finland

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2000年 / 10卷 / 01期

关键词：

D O I：

10.1109/77.828452

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have studied the frequency dependence of self-field sc losses in multifilamentary Bi-2223/Ag tapes at 77 K. The losses were measured at the frequencies of 1 - 400 Hz. The electromagnetic loss measurements were completed by the measurement of the magnetic flux distribution inside the tape due to the ac transport current at different stages of the sc cycle. According to the results the ac losses per cycle at fixed current amplitude are the higher the lower the frequency. The experimental results were compared to numerical ones computed using the finite-element method. The comparison between the experimental and computational results states that the frequency dependence of the losses per cycle is mainly caused by finite values of index n (of the E(J)-characteristics) due to thermally activated flux creep. As a result, the self-field penetrates the deeper into the conductor the lower the frequency, which means higher hysteresis losses per cycle.

引用

页码：1212 / 1215

页数：4

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