高温超导方形细线的交流损耗特性研究

Study on AC loss characteristics of high-temperature superconducting square wires

当前超导电缆能否实现大规模应用还面临着多项关键技术问题,进一步改进超导电缆的结构和绕制技术、进一步降低交流损耗就是其中的两个方面。将多根高温超导方形细线(Soldered-Stacked-Square HTS wire)通过并联形成一根双根结构的高温超导缆线,采用电测量法,在77 K、零外场及不同频率条件下,对高温超导方形细线通以不同运行电流时产生的交流传输损耗进行测量,可以获得双根高温超导方形细线的交流损耗与传输电流频率之间的关系,结果表明两者无关,并且超导方形细线的双根并联结构对减小线材的交流损耗能够产生一定影响。

At present,there are many key problems in the large-scale application of superconducting cable.Further improving the structure and winding technology of superconducting cable and further reducing AC loss are two aspects.Multiple high-temperature superconducting square wires(Soldered-Stacked-Square HTS wire)are connected in parallel to form a high-temperature superconducting cable with double-strand structure,in this paper,an electrical measurement method was used to measure the AC transmission loss of high temperature superconducting square wires under the condition of 77 K,zero external magnetic field and different frequencies.Guided square wires were measured with the AC transmission loss generated at different operating currents,and the relationship between the AC loss of two high-temperature superconducting square wires and the frequency of the transmission current could be obtained.The results show that they are irrelevant and the double parallel structure of superconducting square wires can have an effect on reducing the AC loss of the wire.