基于LabVIEW的高温超导电缆交流损耗测试系统设计

Design of AC loss testing system of HTS cable based on LabVIEW

交流损耗是影响超导设备设计和运行的一个重要因素。为了研究冷绝缘高温超导电缆交流损耗的变化规律,提出了一种基于虚拟仪器(LabVIEW)的高温超导电缆交流损耗的测量方法,并搭建了交流损耗的测试系统。通过美国国家仪器公司的数据采集系统获取超导电缆内外导体层的端电压和各层电流信号,基于互相关算法求出每层端电压和电流信号的相位差,在消除接头电阻的影响后计算得到交流损耗。在50Hz和60Hz的情况下,测量了0.2m长、110kV/1.5kA的高温超导电缆模型样缆的交流损耗。结果表明在对数坐标下,交流损耗随传输电流增大而线性增大,将频率归一化后,不同频率下电缆的损耗曲线基本吻合,单位周期的交流损耗值相同。研究的结果对于高温超导电缆研究和应用具有一定的参考价值。

The AC loss is an important factor in design and operation of the superconducting equipment. In order to study the cold insulation AC loss of HTS （High Temperature Superconducting） cable variation, proposed based on LabVIEW cable AC loss measurement methods and build AC loss measurement system. Experiments using NI＇s data acquisition system to obtain the voltage and current signals of a short sample HTS cable outer and inner layers. Based on cross-correlation algorithm derived phase difference of voltage and current signals, in the elimination of the effect of joint resistance and then calculate the AC losses. At 50 and 60Hz, the measurement of the 0. 2m long, 110kV/1.5kA HTS cable AC losses of the cable sample model. The results show that in logarithmic coordinates, the AC loss with transport current increases linearly, after normalized frequency, the loss of the cable curve under different frequencies was consistent, unit cycles of ac loss values are the same. The research results have certain reference value for the research and application of HTS cable.