Development of 66 kV/750 A High-T/sub c/ superconducting fault current limiter magnet
Development of 66 kV/750 A High-T/sub c/ superconducting fault current limiter magnet
复制标题
开发66 kV/750 A High-T/sub c/超导故障限流磁体
DOI：
10.1109/tasc.2004.830271
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发表时间：
2004
影响因子：
1.8
通讯作者：
K. Inoue
中科院分区：
文献类型：
--
作者：
T. Yazawa;Y. Ootani;M. Sakai;Toru Kuriyama;S. Nomura;T. Ohkuma;N. Hobara;Yoshihisa Takahashi;K. Inoue
2000年至2004年执行的超导交流设备项目中包括的项目之一是开发66 kV/750 A高温超导故障限流器磁体。本课题研究了66 kV级故障限流器的基本技术问题，即大电流容量、高压绝缘和过冷氮气冷却。本文介绍了磁铁的设计和迄今为止所获得的测试结果。磁体主要由真空室、氮浴、一对电流引线、低温冷却器和六组绕有Bi 2223带材的单元线圈组成。每个线圈的额定电流在70 K时约为125 A，因此磁体的总电流容量为750 A。磁体的绝缘电压为66 kV级。到2002财政年度末，三套单元线圈被安装在低温恒温器中，并进行了一些评估测试，作为该计划的一个里程碑。在冷却试验中，获得了65 K的过冷氮气，在制冷剂中具有均匀的温度分布。在过电压试验中，在施加140 kV交流电压1分钟和350 kV雷电冲击电压的情况下，没有观察到击穿。在过冷氮气中测量线圈的电压-电流特性。直流和交流试验均成功地获得了375 A的额定电流。构成66 kV/750 A磁体开发里程碑的所有目标都已实现。
One of the items included in the Super-conductive AC Equipment (Super-ACE) project, being performed from 2000 to 2004, is a development of a 66 kV/750 A high-T/sub c/superconducting (HTS) fault current limiter (FCL) magnet. This research focuses on fundamental technical items essential for a 66 kV class fault current limiter, that is, high current capacity, high voltage insulation and sub-cooled nitrogen cooling. This paper describes the design of the magnet and the test results obtained so far. The magnet mainly consists of a vacuum vessel, a nitrogen bath, a pair of current leads, cryocoolers, and six sets of unit-coils wound with Bi2223 tapes. The rated current of each coil is about 125 A at 70 K, and so the total current capacity of the magnet is 750 A. The insulation voltage of the magnet is of the 66 kV class. By the end of FY2002, three sets of the unit coils were set connected in the cryostat and some evaluation tests were implemented as a milestone of the program. In the cooling down test, sub-cooled nitrogen of 65 K was obtained with homogenous temperature distribution in the cryogen. In the overvoltage test, no breakdowns were observed in the case of applying both ac voltage of 140 kV for one minute and lightning impulse voltage of 350 kV. Voltage-current characteristics of the coils were measured in sub-cooled nitrogen. The rated current of 375 A was successfully obtained for both direct and alternate current tests. All the targets constituting the milestone of the 66 kV/750 A magnet development were achieved.