摘要
介绍了 6m长 2 0 0 0A高温超导直流电缆———Bi 2 2 2 3/Ag带材的主要性能和该高温超导输电电缆的设计、绕制和试验结果。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 4 1 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 4 8mm ,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 4 80A ,n值为 7.7,接头总电阻为 0 .1μΩ ,均优于设计指标。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。
A 6m, 2000 A HTS DC cable has been developed. The conductors of the HTS cable consist of 238 Bi-2223/Ag tapes, which were helically wound on a flexible stainless former layer by layer (8 layers in all), followed by layers of cryogenic dielectric tapes. Adjacent conductor layers are insulated from each other. The inner of conductor is 41.5 mm. The cable core has a 48 mm outer diameter and is housed in a cryogenic envelope, connecting a pair of terminations. The DC withstand voltage is more than 2.5 kV. The tests showed that the critical current of the cable is 2480 A, n-value is 7.7 and the joint resistance is 0.1 μΩ at 77 K. The cable operated in 1 hour with 2 kA steadily and reliably. The critical current of the cable has no degradation after 4 thermal cycles. The main properties of the Bi-2223/Ag tape and the design, fabrication and test results of the HTS cable are presented in this paper.
出处
《高技术通讯》
EI
CAS
CSCD
2001年第10期95-99,共5页
Chinese High Technology Letters
基金
863计划资助项目 ( 863 CD0 10 10 3)
