文档名：二代高温超导带材失超特性研究
摘要：高温超导带材失超会降低其通流能力,从而影响高温超导装置的运行稳定性.目前,高温超导带材失超仿真模型多为二维计算模型,无法准确模拟其失超过程中的电磁热行为.该文采用有限元方法对二代高温超导带材失超特性进行多物理场耦合分析.在三维直角坐标系下,以磁场强度矢量为求解变量,建立了二代高温超导带材失超演化电磁热仿真模型,研究了二代高温超导带材长度方向与宽度方向在不同热扰动工况下的电磁热特性及其演化过程,分析了高温超导带材过电流失超过程中的各层分流状况与超导层电阻率变化行为,区分了不同类型的过电流失超行为,并提出了高温超导带材过电流冲击失超的电阻率判据.
Abstract：Thequenchofhightemperaturesuperconducting(HTS)tapeswillreducetheirflowcapacityandthusaffecttheoperationstabilityofhightemperaturesuperconductingdevices.Atpresent,mostsimulationmodelsofsuperconductingtapesaretwo-dimensionalmodels,whichcannotaccuratelysimulatetheelectromagnetic-thermalbehaviorintheprocessofquench.Afiniteelementmethodwithmultiplephysicalfieldcouplingisusedtostudythequenchcharacteristicsofthesecond-generationhightemperaturesuperconductingtapes.Inthethree-dimensionalcoordinatesystem,themagneticfieldintensityvectoristakenasthesolutionvariabletoestablishthesecond-generationHTStapequenchevolutionelectromagnetic-thermalsimulationmodel.Theelectromagnetic-thermalcharacteristicsandevolutionunderdifferentthermaldisturbanceconditionsofthesecond-generationHTStapesalongthelengthdirectionaswellasthewidthdirectionarestudied.Theshuntstateofeachlayerandtheresistivitychangebehaviorofthesuperconductinglayerintheprocessofsuperconductingtapesovercurrentareanalyzed,differenttypesofovercurrentandovercurrentbehaviorsaredistinguished,andtheresistivitycriterionofovercurrentquenchisproposed.Forthesuperconductingtapesstudiedinthispaper,theminimumquenchenergyis4.62Jandthepropagationvelocityis0.96cm/swhenIop=0.6Ic.Whenthelocalheatenergyis1.82Qmq,thetemperatureoftapestaysabovecriticaltemperatureforashorttimeafterthethermaldisturbanceends,andthetapestaysquenching.Whenthelocalheatenergyis3.9Qmq,duringthethermaldisturbancethemaximumcurrentdensityregionofthesuperconductinglayerdiffusingtootherregions,thehotregionchangesfromsuperconductingstatetoresistivestate,andpropagatessymmetricallyalongthetapes.After2s,thequenchregionexpandstotwicethequenchingregionthantheinitialstageofthethermaldisturbance.Accordingtotheovercurrentdegree,durationandtheshuntconditionofhightemperaturesuperconductingtapes,andcorrespondingresistivitychangeofthesuperconductinglayer,thecriterionofovercurrentquenchresistivityisputforwardasfollows.Whentheovercurrentcausestheresistivityofthesuperconductinglayertobelowerthanthatofthesilverlayerandthecopperlayer,theovercurrentcausestherecoverablequenchofthetapes.Whentheovercurrentcausesheataccumulatesinthesuperconductinglayer,theresistivityofthesuperconductinglayercontinuestobehigherthanthatofthesilverlayerandthecopperlayer,andwhenthecriticalresistivityreachesacertaintransitiontime,theovercurrentimpactleadstounrecoverablequench.Comparedwiththetwo-dimensionalmodel,thethree-dimensionalmodelsolvestheproblemthatthetwo-dimensionalmodelcannotsimulatetheelectromagnetic-thermalbehaviorofthesuperconductingtapesinwidthdirectionduringthequenchprocess.Itcanaccuratelysimulatetheelectromagnetic-thermalcharacteristicsandevolutionprocessofthesecond-generationsuperconductingtapesinlengthandwidthdirectionunderdifferentthermaldisturbances.
作者：杨志星 任丽 徐颖 段璞 李鑫Author：YangZhixing RenLi XuYing DuanPu LiXin
作者单位：强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院)武汉430074
刊名：电工技术学报
Journal：TransactionsofChinaElectrotechnicalSociety
年，卷(期)：2024, 39(1)
分类号：TM26
关键词：二代高温超导带材 失超特性 有限元 电磁热耦合
Keywords：Second-generationhightemperaturesuperconductingtape quenchcharacteristic finiteelementmethod electromagnetic-thermalcoupling
机标分类号：O359.1P223.6O211.6
在线出版日期：2024年1月18日
基金项目：国家重点研发计划二代高温超导带材失超特性研究[
期刊论文] 电工技术学报--2024, 39(1)杨志星 任丽 徐颖 段璞 李鑫高温超导带材失超会降低其通流能力,从而影响高温超导装置的运行稳定性.目前,高温超导带材失超仿真模型多为二维计算模型,无法准确模拟其失超过程中的电磁热行为.该文采用有限元方法对二代高温超导带材失超特性进行多物...参考文献和引证文献
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二代高温超导带材失超特性研究 Study On Quench Characteristics of Second-Generation High Temperature Superconducting Tapes
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