高温超导电缆交直流伏安特性测试与分析

为了研究高温超导电缆在直流和交流载流情况下伏安特性的变化规律,提出基于第二代YBCO高温超导体的冷绝缘超导电缆交直流伏安特性测试方法,搭建了伏安特性测试实验系统,通过对一根0.2m长,110k V/1.5k A高温超导电缆样缆的交直流伏安特性进行测试,获得了超导电缆在直流、30Hz、100Hz和工频载流下伏安特性变化规律。结果表明,超导电缆的直流伏安特性曲线呈现E-J指数关系,且失超变化清楚,而交流下当超导电缆通流值低于直流临界值时,交流伏安特性曲线变化平缓,之后随通流能力增加后该曲线呈逐渐上升趋势,超导电缆没有出现明确的失超变化点。研究结果对于开展超导电缆运行稳定性研究提供了较大的参考价值。

Test and Analysis on the DC and AC I-V Characteristics of High Temperature Superconducting Cable

The test methods for the DC and AC I-V characteristics are proposed respectively for a cold dielectric high temperature superconducting (HTS) cable that consists of YBCO coated conductor. A 0.2m, 110kV/1.5kA demo HTS cable is constructed using YBCO coated conductor, and an I-V characteristics test system is set up as well to obtain the DC, 30Hz, 50Hz and 100Hz AC I-V curves for the HTS cable. The experimental results show that the currents and voltages in the DC critical current characteristic curve behave E-J power exponential relationship, and the quench point of the HTS cable can be found clearly in this curve. But for the AC I-V characteristics curve, the voltages of the HTS cable is smooth when the current amplitude is less than the critical current of HTS cable. The voltage increases with the increase of the AC current in the HTS cable, and there is no inflection point in AC I-V characteristics curve of HTS cable. Those test results provide a reference for the operational stability of superconducting cable.