【英文标准名称】:Superconductivity-Criticalcurrentmeasurement-D.C.criticalcurrentofNb-Ticompositesuperconductors
【原文标准名称】:超导性.临界电流测量.铌-钛复合超导体的直流临界电流
【标准号】:BSEN61788-1-2007
【标准状态】:现行
【国别】:英国
【发布日期】:2007-02-28
【实施或试行日期】:2007-02-28
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:铜;临界电流;临界数据;电流测量;直流电;电气工程;测量;测量技术;铌;超导性;超导体;试验;钛
【英文主题词】:Copper;Criticalcurrent;Criticalitydata;Currentmeasurement;Directcurrent;Electricalengineering;Measurement;Measuringtechniques;Niobium;Superconductivity;Superconductors;Testing;Titanium
【摘要】:ThispartofIEC61788coversatestmethodforthedeterminationofthed.c.criticalcurrentofeitherCu/Nb-Ticompositesuperconductorsthathaveacopper/superconductorratiolargerthan1orCu/Cu-Ni/Nb-Tiwiresthathaveacopper/superconductorratiolargerthan0,9andacopperalloy(Cu-Ni)/superconductorratiolargerthan0,2,wherethediameterofNb-Tisuperconductingfilamentsislargerthan1μm.ThechangesfortheCu/Cu-Ni/Nb-TiaredescribedinAnnexC.TheCu-NiusesallofthemainpartofthestandardwiththeexceptionslistedinAnnexCthatreplace(andinsomecasesarecounterto)someofthestepsinthemaintext.Thismethodisintendedforusewithsuperconductorsthathavecriticalcurrentslessthan1000Aandn-valueslargerthan12,understandardtestconditionsandatmagneticfieldslessthanorequalto0,7oftheuppercriticalmagneticfield.Thetestspecimenisimmersedinaliquidheliumbathataknowntemperatureduringtesting.Thetestconductorhasamonolithicstructurewitharoundorrectangularcross-sectionalareathatislessthan2mm2.Thespecimengeometryusedinthistestmethodisaninductivelycoiledspecimen.Deviationsfromthistestmethodthatareallowedforroutinetestsandotherspecificrestrictionsaregiveninthisstandard.Testconductorswithcriticalcurrentsabove1000Aorcross-sectionalareasgreaterthan2mm2couldbemeasuredwiththepresentmethodwithananticipatedincreaseinuncertaintyandamoresignificantself-fieldeffect(seeAnnexB).Other,morespecialized,specimentestgeometriesmaybemoreappropriateforlargerconductortestingwhichhavebeenomittedfromthispresentstandardforsimplicityandtoretainaloweruncertainty.Thetestmethodgiveninthisstandardisexpectedtoapplytoothersuperconductingcompositewiresaftersomeappropriatemodifications.
【中国标准分类号】:H63
【国际标准分类号】:29_050
【页数】:32P.;A4
【正文语种】:英语