【摘要】 6m长、2 0 0 0A的铋系高温超导直流电缆在中国科学院电工研究所研制并试验成功 .电缆的导体由 8层共2 38根Bi- 2 2 2 3 Ag带材在不锈钢波纹管骨架上螺旋绕制而成 ,导体的内径为 41 5mm ,导体层间绝缘 ,导体层外侧有低温电绝缘 .电缆芯的外径为 48mm ,它安装在低温容器内 ,并与两个终端相连 .电缆的直流耐压大于 2 5kV .在液氮下的实验表明 ,电缆的临界电流为 2 480A(1μV cm判据 ) ,n值为 7 7,接头总电阻为 0 1μΩ ,均超过设计指标 .在 1h传输 2kA电流的运行中 ,电缆的传输特性稳定 .经 4次热循环 ,电缆的临界电流没有降低 .更多还原

【Abstract】 A 6 m, 2kA bismuth\|based high T \-c superconducting DC cable has been developed and tested successfully at the Institute of Electrical Engineering, Chinese Academy of Sciences. The conductor of the cable consists of 238 Bi\|2223/Ag tapes, helically wound on a flexible stainless steel former layer by layer(8 layers in all), followed by layers of cryogenic dielectric tapes. A djacent conductor layers are insulated from each other. The inner diameter of the conductor is 41\^5mm. The cable has an outer diameter of 48mm and is housed in a cryogenic envelope, connected to a pair of terminations. The DC breakdown voltage is more than 2\^5kV. Tests show that the critical current of the cable is 2480 A, the n \|value is 7\^7 and the joint resistance is 0\^1μΩ at 77K. The cable trtansmitted 2kA for 1 hour steadily and reliably, with no degradation of the critical current after 4 thermal cycles.更多还原