准各向同性导体指数损耗分析
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摘要
高温超导材料具有弱连接和低钉扎力的特性,当超导中通入交流时,导体内磁通线的运动需克服钉扎力,导致焦耳热损耗,即指数损耗,特别是通入的电流接近于临界电流时,该损耗不可忽略。运用数值仿真的方法分析了由第二代高温超导带材构成的准各向同性高温超导股线的指数损耗的特点。研究表明:指数损耗在股线中的分布与磁场的分布密切相关,即处于股线外侧的超导带材的指数损耗要远大于内侧的超导带材;股线总的指数损耗随着通入的电流的增大呈指数倍的增加。
The high temperature superconducting( HTS) tape has intrinsic characteristics of weak-link and low pinning potential. The movement of the magnetic flux lines in the conductor needs to overcome the pinning potential resulting in joule loss( so called index loss) while AC is introduced into superconductor. Especially when the current is close to the critical current,the loss can not be negligible. The index loss of quasi-isotropic strands was studied in this paper using numerical simulation method. Researches show that,the distribution of index loss in quasi-isotropic strands is related to the magnetic field of strands,the index loss of superconducting tape on the outside of the strand is more than that of the inner superconducting tape,and the index loss of quasi-isotropic stands increase exponentially with increasing current.
The high temperature superconducting( HTS) tape has intrinsic characteristics of weak-link and low pinning potential. The movement of the magnetic flux lines in the conductor needs to overcome the pinning potential resulting in joule loss( so called index loss) while AC is introduced into superconductor. Especially when the current is close to the critical current,the loss can not be negligible. The index loss of quasi-isotropic strands was studied in this paper using numerical simulation method. Researches show that,the distribution of index loss in quasi-isotropic strands is related to the magnetic field of strands,the index loss of superconducting tape on the outside of the strand is more than that of the inner superconducting tape,and the index loss of quasi-isotropic stands increase exponentially with increasing current.
引文
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[2]王银顺.基于第二代高温超导带材的高载流超导导体研究进展[J].电工电能新技术,2017,36(11):21-35.
[3]张博,余运佳,王秋良.高温超导磁体指数损耗分析[J].低温物理学报,2006,28(1):57-62.
[4]张泉,王秋良,赵尚武,等.高温超导体指数损耗的有限元数值分析及相关问题讨论[J].低温物理学报,2010,32(3):235-240.
[5]陈鑫,诸嘉慧,周卓楠,等.外界磁场对两种YBCO超导带材临界电流及n值影响分析[J].电工技术学报,2012,27(10):1-5.
[6]时晨杰.第二代高温超导体超导股线交直流特性研究[D].北京:华北电力大学,2016.
[7]Shi C,Wang Y,Li J,et al. Criticalcurrent of a quasi-isotropic HTS strand in magnetic field[J]. IEEE Transactions on Applied Superconductivity,2016,26(5):1-5.
[8]Rostila L,S9derlund L,Mikkonen R,et al. Modelling method for critical current of YBCO tapes in cable use[J]. Physica C:superconductivity,2007,467(1):91-95.
[9]孙迪.基于涂层导体的复合超导股线临界电流特性[D].北京:华北电力大学,2014.
[10]杜伯学,邢云琪,傅明利,等.高温超导电缆及其低温绝缘研究现状[J].南方电网技术,2015,9(12):29-38.