共查询到15条相似文献,搜索用时 171 毫秒
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EAST装置做为全超导托卡马克装置,其纵场和极向场线圈全部由超导磁体组成,所以进行安全,准确,有效的超导线圈的失超保护是装置安全运行的首要环节.由于等离子体电流的建立必须由极向场线圈系统提供极快速的磁通变化,随之产生较高的交流损耗使得极向场线圈很容易发生失超.如何对快速交变脉冲磁场下的超导线圈进行有效的失超检测,这在世界上也无先例可循.EAST装置的失超检测系统经过几十轮单饼超导线圈实验及多轮装置正式放电实验后逐步建立和完善起来,并已通过工程验收满足了装置实验运行要求.本文主要介绍了EAST装置失超检测系统的基本结构和检测原理,重点阐述了极向场超导磁体失超检测的设计方法及实验结果。 相似文献
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中心螺管是超导托卡马克装置磁体系统的重要组成部分 ,在 HT- 7U中 ,中心螺管采用管装超导电缆绕制 ,线圈以脉冲方式运行。文中介绍了 HT- 7U中心螺管模型线圈实验中 ,失超信号检测系统的工作原理及失超信号特点。当磁体以脉冲方式运行时 ,失超信号检测系统为装置提供可靠的失超保护动作信号 ;还给出了有关的实验数据和检测系统记录的失超信号变化曲线。 相似文献
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介绍了FAIR项目Super-FRS超导二极磁铁样机的基于FPGA的失超探测系统。该失超探测系统采用平衡桥路法, 并通过两组独立桥路以消除失超探测死区。 通过NI PXI 7830R FPGA模块实现平滑滤波和失超判断算法,并给出失超触发信号。失超数据采集模块采用预采样技术, 将失超前后一段时间内的数据采集下来,以便进行后续分析。 通过测试,失超探测模块准确检测到了失超的发生, 并触发失超保护电路和失超数据采集模块工作,有效地保护了超导二极磁铁。 : The quench detection system for Super FRS super ferric dipole prototype magnet of FAIR has been designed and built. The balance bridge was used to detect quench signal. In order to avoid blind zone of quench detection, two independent bridges were used. NI PXI 7830R FPGA was used to implement filter to quench signal and algorithm of quench decision and to produce quench trigger signal. Pre sample technique was used in quench data acquisition. The data before and after quench could be recorded for analysis later. The test result indicated that the quench of the dipole’s superconducting coil could be reliably detected by the quench detection module. 相似文献
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X.L. Guo F.Y. Xu L. Wang M.A. Green H. Pan H. Wu X.K. Liu A.B. Chen 《Physica C: Superconductivity and its Applications》2009,469(21):1930-1934
Accurate analysis of over voltage in the superconducting solenoid during a quench is one of the basis for quench protection system design. Classical quench simulation methods can only give rough estimation of the over voltage within a magnet coil. In this paper, for multi-sectioned superconducting solenoid, based on the classical assumption of ellipsoidal normal zone, three-dimension temperature results are mapped to one-dimension along the wire, the temperature distribution along the wire and the resistances of each turn are obtained. The coil is treated as circuit comprised of turn resistances, turn self and mutual inductances. The turn resistive voltage, turn inductive voltage, and turn resultant voltage along the wire are calculated. As a result, the maximum internal voltages, the layer-to-layer voltages and the turn-to-turn voltages are better estimated. Utilizing this method, the over voltage in a small solenoid and a large solenoid during quenching have been studied. The result shows that this method can well improve the over voltage estimate, especially when the coil is larger. 相似文献