【摘要】 利用传输电流法设计了一套高温超导体自场损耗测量系统，样品上负载的传输电流幅值可以达到１００Ａ，频串在 ０．５ Ｈｚ到１０００Ｈｚ之间任意可调。测量了 Ｂｉ２２２３／Ａｇ高温超导带材在７７Ｋ不同频率条件下的自场交流损耗，并将实验结果与Ｎｏｒｒｉｓ方程的预期值进行了比较。发现当传输电流的频率较低时，Ｂｉ２２２３／Ａｇ的交流损耗主要是磁滞损耗；而当频率较高时耦合损耗不能忽略。更多还原

【Abstract】 An experimental set-up was designed for measuring the self-field losses of Bi2223/Ag HTS tapes using a transport current method. The frequency of transport current can be freely changed from 0.5 Hz to 1000Hz. Its amplitude can be as much as 100A. The self-field losses of Bi2223/Ag tapes,which are made by the traditional PIT method with the critical current of 15.5A and SC/Ag ratio of about 0.25 were measured at 77K with differnt frequency transport currents. The results are compared with those predicted by the Norris equations based on the critical state model. When the frequency of AC current is low the AC losses of Bi2223/Ag multifilamentry tapes are domestically hysterestic; As soon as the frequencies are more than 200 Hz, the eddy current losses can not be neglected.更多还原