中心螺管模型线圈交流损耗计算及测试

Test and Calculation of AC Loss for the Centric Solenoid Modal Coil

中心螺管模型线圈选用 Nb Ti/ Cu复合超导材料 ,超导股线直径 0 .85 m m,Cu截面积与 Nb Ti截面积比为 1.38;经过 4级绞缆和成型 ,导体尺寸为 17.4 mm× 17.4 m m,中心冷却孔直径 4 .1m m。线圈用超临界氦冷却 ,流体进口温度为 3.8- 4 .2 K,压力 6 bar,每个流道流量 2 .2 g/ s。用量热法对中心螺管模型线圈进行了交流损耗测试并与计算值相比较 ,3次交流损耗电流分别是 :30 0 A/ s速度励磁和放电 ,最大电流 5 k A ,交流损耗测量值为每脉冲 78.3J;30 0 A / s速度励磁和放电 ,最大电流 7k A ,交流损耗测量值为每脉冲 14 0 .7J;4 0 0 A/ s速度励磁和放电 ,最大电流 7k A,交流损耗测量值为每脉冲14 5 .4 J;计算值分别为每脉冲 98J,1385 J,14 2 J;两者较好相符。

The centric solenoid modal coil has been made by NbTi/Cu compounding material, the diameter of strands is 0.85mm, the cross section ratio of Cu and NbTi is 1.38. After four times wing and molding, dimension of conductor is 17.4mm×17.4mm, diameter of central tube is 4.1mm. The coil is cooled by supercritical helium, the coolant inlet temperature and pressure is 3.8K-4.2K and 6bar respectively. Mass flow of each channel is about 2.2g/s. Three times AC loss test has been performed, the current shape and AC loss of each pulse are as follows: ramp and drop rate is 300A/s, I max is 5kA, AC loss is 78.3J; ramp and drop rate is 300A/s, I max is 7kA, AC loss is 140J; ramp and drop rate is 400A/s, I max is 5kA, AC loss is 145.4J. The calculation results are 98J, 138.5J and 142J respectively.