【英文标准名称】:Superconductivity-Part3:Criticalcurrentmeasurement;DCcriticalcurrentofAg-sheathedBi-2212andBi-2223oxidesuperconductors
【原文标准名称】:超导体第3部分:临界电流测量银-外膜铋-2212和铋-2223氧化物超导体的临界直流电流
【标准号】:IEC61788-3-2000
【标准状态】:作废
【国别】:国际
【发布日期】:2000-12
【实施或试行日期】:
【发布单位】:国际电工委员会(IEC)
【起草单位】:IEC/TC90
【标准类型】:()
【标准水平】:()
【中文主题词】:银;临界数据;测量;超导性;装箱;直流电流;长丝;成束导线;电流测量;电气工程;镀银;外套
【英文主题词】:Bundledconductors;Casing;Coats;Criticalitydata;Currentmeasurement;Directcurrent;Electricalengineering;Filament(textilefibre);Measurement;Silver;Silvercoating;Superconductivity;Superconductors
【摘要】:ThispartofIEC61788coversatestmethodforthedeterminationofthed.c.criticalcurrentofshortandstraightAg-orAgalloy-sheathedBi-2212andBi-2223oxidesuperconductorsthathaveamonolithicstructureandashapeofroundwireorflatorsquaretapecontainingmono-ormulticoresofoxides.Thismethodisintendedforusewithsuperconductorsthathavecriticalcurrentslessthan500Aandn-valueslargerthan5.Thetestiscarriedoutwithandwithoutapplyingexternalmagneticfields.Inthetestofthetapespecimeninmagneticfields,themagneticfieldsareparallelorperpendiculartothetapesurface.Thetestspecimenisimmersedeitherinaliquidheliumbathoraliquidnitrogenbathduringtesting.Deviationsfromthistestmethodthatareallowedforroutinetestsandotherspecificrestrictionsaregiveninthisstandard.Substantialpartsofthetestmethodcoveredinthisstandardareincommonwith,orsimilarto,thoseforNb3Sncompositesuperconductors(IEC61788-2).Specialfeaturesnewlyfoundforoxidesuperconductorsmaybeclassifiedintotwogroups.Thefirstgroupisspecifictooxidecompositesuperconductors,includingmechanicalfragilityoriginatingfromthepresenceofweaklinks,cryogengasbubbleformation,agingdegradation,magneticfluxflowandcreep,largeanisotropy,hysteresisincriticalcurrentwithmagneticfieldsweep,etc.Thesecondgroupisduetotheshortlengthofthespecimenusedinthestandard.Acriticalcurrentmeasurementonsuchaspecimenmayeasilypickupdifferentvoltagesignalsduetothermalelectromotiveforce,inductivevoltage,thermalnoise,currentredistribution,specimenmotionrelativetotheholder,etc.Currenttransfervoltagesmaybepresentduetotheshortdistancefromacurrentcontacttoavoltagetap.ShortspecimenlengthmayreducemechanicaltoleranceagainsttheLorentzforce,forexample,bypromotingtheformationofcryogengasbubbleswithinthecomposite.
【中国标准分类号】:L47
【国际标准分类号】:29_050
【页数】:21P;A4
【正文语种】:英语