IEC_61788-4-2016.pdf

g1EC61788-4Edition 4.0 2016-01INTERNATIONALSTANDARDNORMEINTERNATIONALEcolourinsideSuperconductivityPart 4:Residual resistance ratio measurement-Residual resistance ratio ofNb-Ti and Nb3Sn composite superconductorsSupraconductivite-Partie 4:Mesurage du rapport de resistance residuelle-Rapport de resistanceresiduelle des composites supraconducteurs de Nb-Ti et de Nb3SnTHIS PUBLICATION IS COPYRIGHT PROTECTEDCopyright 2016 IEC,Geneva,SwitzerlandAll rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any formor by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing fromeither IEC or IECs member National Committee in the country of the requester.If you have any questions about IECcopyright or have an enquiry about obtaining additional rights to this publication,please contact the address below oryour local IEC member National Committee for further information.Droits de reproduction reserves.Sauf indication contraire,aucune partie de cette publication ne peut etre reproduiteni utilisee sous quelque forme que ce soit et par aucun procede,electronique ou mecanique,y compris la photocopieet les microfilms,sans Iaccord ecrit de IIEC ou du Comite national de IlEC du pays du demandeur.Si vous avez desquestions sur le copyright de IIEC ou si vous desirez obtenir des droits supplementaires sur cette publication,utilisezles coordonnees ci-apres ou contactez le Comite national de IIEC de votre pays de residenceIEC Central OfficeTel.:+412291902113,rue de VarembeFax:+41229190300CH-1211 Geneva 20infoiec.chSwitzerlandwww.iec.chAbout the IECThe International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishesInternational Standards for all electrical,electronic and related technologies.About IEC publicationsThe technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have thelatest edition,a corrigenda or an amendment might have been published.IEC Catalogue-webstore.iec.ch/catalogueElectropedia-www.electropedia.orgThe stand-alone application for consulting the entireThe worlds leading online dictionary of electronic andbibliographical information on IEC International Standards.electrical terms containing 20 000 terms and definitions inTechnical Specifications.Technical Reports and otherEnglish and French,with equivalent terms in 15 additionaldocuments.Available for PC.Mac OS,Android Tablets andlanguages.Also known as the International ElectrotechnicaliPad.Vocabulary(IEV)online.IEC publications search-www.iec.ch/searchpubIEC Glossary-std.iec.ch/glossaryThe advanced search enables to find IEC publications by a65 000 electrotechnical terminology entries in English andvariety of criteria(reference number.text,technicalFrench extracted from the Terms and Definitions clause ofcommittee,.).It also gives information on projects,replacedIEC publications issued since 2002.Some entries have beenand withdrawn publications.collected from earlier publications of IEC TC 37,77,86 andCISPR.IEC Just Published-webstore.iec.ch/justpublishedStay up to date on all new IEC publications.Just PublishedIEC Customer Service Centre-webstore.iec.ch/cscdetails all new publications released.Available online andIf you wish to give us your feedback on this publication oralso once a month by email.need further assistance,please contact the Customer ServiceCentre:csciec.ch.A propos de IlECLa Commission Electrotechnique Internationale(IEC)est la premiere organisation mondiale qui elabore et publie desNormes internationales pour tout ce qui a trait a lelectricite,a lelectronique et aux technologies apparentees.A propos des publications IECLe contenu technique des publications IEC est constamment revu.Veuillez vous assurer que vous possedez Iedition laplus recente,un corrigendum ou amendement peut avoir ete publieCatalogue IEC-webstore.iec.ch/catalogueElectropedia-www.electropedia.orgApplication autonome pour consulter tous les renseignementsbibliographiquessurlesNormesLe premier dictionnaire en ligne de termes electroniques etintemationales.electriques.Il contient 20 000 termes et definitions en anglaisSpecifications techniques,Rapports techniques et autresdocuments de IIEC.Disponible pour PC.Mac OS,tabletteset en francais,ainsi que les termes equivalents dans 15langues additionnelles.Egalement appele VocabulaireAndroid et iPad.Electrotechnique International(IEV)en ligne.Recherche de publications IEC-www.iec.ch/searchpubGlossaire IEC-std.iec.ch/glossaryLa recherche avancee permet de trouver des publications IEC65 000 entrees terminologiques electrotechniques,en anglaisen utilisant differents criteres(numero de reference,texte,et en francais,extraites des articles Termes et Definitions descomite detudes,.).Elle donne aussi des informations sur lespublications IEC parues depuis 2002.Plus certaines entreesprojets et les publications remplacees ou retirees.anterieures extraites des publications des CE 37,77,86 etCISPR de rIEC.IEC Just Published-webstore.iec.ch/justpublishedRestez informe sur les nouvelles publications IEC.JustService Clients-webstore.iec.ch/cscPublished detaille les nouvelles publications parues.Si vous desirez nous donner des commentaires sur cetteDisponible en ligne et aussi une fois par mois par emailpublication ou si vous avez des questions contactez-nous:csciec.ch.1EC61788-4Edition 4.0 2016-01INTERNATIONALSTANDARDNORMEINTERNATIONALEcolourinsideSuperconductivity-Part 4:Residual resistance ratio measurement-Residual resistance ratio ofNb-Ti and Nb3Sn composite superconductorsSupraconductivite-Partie 4:Mesurage du rapport de resistance residuelle-Rapport de resistanceresiduelle des composites supraconducteurs de Nb-Ti et de Nb3SnINTERNATIONALELECTROTECHNICALCOMMISSIONCOMMISSIONELECTROTECHNIQUEINTERNATIONALE1CS17.220.20:29.0501SBN978-2-8322-3129-6Warning!Make sure that you obtained this publication from an authorized distributorAttention!Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agree.Registered trademark of the Intemnational Electrotechnical CommissiorMarque depose de a Comission Electrotechnique Intemationale-2-1EC61788-4:20161EC2016CONTENTSFOREWORD4INTRODUCT1ON.61Scope.2 Normative references.Terms and definitions.5 Apparatus.85.1 Material of measurement mandrel or of measurement base plate.85.2Diameter of the measurement mandrel and length of the measurement baseplate.85.3Cryostat for the resistance(R2)measurement.96 Specimen preparation.97Data acquisition and analysis.97.1 Resistance(R)at room temperature.97.2 Resistance(R2 or R2)just above the superconducting transition.97.2.1Correction of strain effect.97.2.2Data acquisition of cryogenic resistance.107.2.3Optional acquisition methods.127.3Correction on measured R2 of Nb-Ti composite superconductor for bendingStrain.27.4Residual resistance ratio(RRR).128 Uncertainty and stability of the test method.128.1 Temperature.128.2Voltage measurement.128.3.38.49 Test report.139.1RRR value.139.2Specimen.139.3Test conditions.149.3.1Measurements of R and R2.149.3.2Measurement of R1.149.3.3Measurement of R2.14Annex A(informative)Additional information relating to the measurement of RRR.15A.1Recommendation on specimen mounting orientation.15A.2Alternative methods for increasing temperature of specimen abovesuperconducting transition temperature.15A.3Alternative measurement methods of R2 or R2.15A.4 Bending strain dependency of RRR for Nb-Ti composite superconductor.18A.5Procedure of correction of bending strain effect.21Annex B(informative)Uncertainty considerations.23B.1Overview.23B.2Definitions.23B.3Consideration of the uncertainty concept.231EC61788-4:20161EC2016-3-B.4Uncertainty evaluation example for TC 90 standards.25Annex C(informative)Uncertainty evaluation in test method of RRR for Nb-Ti andNb3Sn composite superconductors.27C.1 Evaluation of uncertainty.27C.2Summary of round robin test of RRR of a Nb-Ti composite superconductor.30C.3 Reason for large COV value in the intercomparison test on NbaSn compositesuperconductor.31Bibliogtaphy.32Figure 1-Relationship between temperature and resistance.8Figure 2-Voltage versus temperature curves and definitions of each voltage.10Figure A.1-Definition of voltages.17Figure A.2-Bending strain dependency of RRR value for pure Cu matrix of Nb-Ticomposite superconductors(comparison between measured values and calculatedvalues）19Figure A.3-Bending strain dependency of RRR value for round Cu wires.19Figure A.4-Bending strain dependency of normalized RRR value for round Cu wires.20Figure A.5-Bending strain dependency of RRR value for rectangular Cu wires.20Figure A.6-Bending strain dependency of normalized RRR value for rectangular CuFigure C.1-Distribution of observed rRRR of Cu/Nb-Ti composite superconductor.31Table A.1-Minimum diameter of the measurement mandrel for round wires.21Table A.2-Minimum diameter of the measurement mandrel for rectangular wires.21Table B.1-Output signals from two nominally identical extensometers.2.4Table B.2-Mean values of two output signals.24Table B.3-Experimental standard deviations of two output signals.24Table B.4-Standard uncertainties of two output signals.25Table B.5-coV values of two output signals.2Table C.1-Uncertainty of each measurement.30Table C.2-Obtained values of R,R2 and rRRR for three NbaSn samples.31