50 kA超导变压器杜瓦及高温超导电流引线的设计与优化

CICC超导导体性能测试用50 kA超导变压器由初级线圈和次级线圈组成,初级线圈浸泡在4.2 K液氦低温杜瓦中,次级线圈为CICC导体采用4.2 K/354 637 Pa超临界氦迫流冷却,液氦和超临界氦均由500 W/4.5 K制冷机提供,变压器低温杜瓦的理论液氦蒸发率为1.52 L/h。为减少电流引线漏热,超导变压器采用B i-2223/AgAu高温超导(HTS)二元电流引线,并且在颈管中部设计了一个新型的直接用液氮冷却的热截流装置来截断电流引线高温端的热流;最后对铜电流引线部分进行了尺寸优化计算,得到最佳截面积和直径分别为28 mm2和6 mm。

Design and optimization of 50 kA super-conducting transformer dewar and high-temperature super-conductor current lead

A 50 kA super-conducting transformer,designed to charge ITER CC conductor samples,consisted of a primary coil and a secondary coil.The former was immersed in 4.2 K liquid helium and the latter was cooled with a forced flow supercritical helium of 4.2 K/354 637 Pa,both of which were supplied by a 500 W/4.5 K refrigerator.The theoretical evaporation of liquid helium dewar was 1.52 L/h.To reduce heat leak,a Bi-2223/AgAu binary HTS current lead was needed and a new type of heat cut-off device cooled by liquid n...