液氢温区YBCO超导带材的交流损耗研究

Study on ac losses of YBCO superconducting tapes at the temperature of liquid hydrogen

超导电缆具有载流能力强、损耗低等优势,是电力输送的良好选择。但是,超导电缆需工作于低温环境。液氢温度为20K,可为超导电缆提供低温条件,将超导电缆输电与液氢燃料输送相结合,可解决超导电缆在输电中的瓶颈问题。开展了液氢替代液氮后高温超导带材的传输交流损耗研究。针对美国超导公司提供的黄铜加强YBCO带材,采用H法有限元模型,仿真分析了液氢、液氮冷却时超导带材的传输交流损耗。结果表明采用液氢作为超导带材的冷却介质时,带材正常金属产生的涡流损耗和磁性基底产生的铁磁损耗对总损耗的影响程度较小。所得结果可为液氢温区超导电缆的设计和运行提供参考。

Superconducting cable is a good choice for power transmission due to its large current carrying capacity and low loss. However, superconducting cables need to operate at cryogenic environment. The liquid hydrogen with temperature of 20K can be taken as cooling medium of the superconducting cable, which achieves power and fuel transmissions at the same time. In this paper, the transport ac loss of high temperature superconducting tapes cooled by liquid hydrogen was investigated and com- pared with the case cooled by liquid nitrogen. The brass reinforced YBCO tapes used in this paper were supplied by the American Superconductor Corporation. The transport ac losses of superconducting tapes cooled by liquid hydrogen and liquid nitrogen were analyzed by the finite element method based on H - formulation. Results show that for REBCO tapes cooled by liquid hydrogen, the influences of eddy current and ferromagnetic losses on the total ac loss is weak. The obtained results can provide a reference for the design and operation of superconducting cables operating in liquid hydrogen.