1、 IEC 61788-4 Edition 4.0 2016-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 4: Residual resistance ratio measurement Residual resistance ratio of Nb-Ti and Nb 3 Sn composite superconductors Supraconductivit Partie 4: Mesurage du rapport de rsistance rsiduelle Rapport de rsist
2、ance rsiduelle des composites supraconducteurs de Nb-Ti et de Nb 3 Sn IEC 61788-4:2016-01(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2016 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in
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19、des CE 37, 77, 86 et CISPR de lIEC. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61788-4 Edition 4.0 2016-01 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 4: R
20、esidual resistance ratio measurement Residual resistance ratio of Nb-Ti and Nb 3 Sn composite superconductors Supraconductivit Partie 4: Mesurage du rapport de rsistance rsiduelle Rapport de rsistance rsiduelle des composites supraconducteurs de Nb-Ti et de Nb 3 Sn INTERNATIONAL ELECTROTECHNICAL COM
21、MISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 17.220.20; 29.050 ISBN 978-2-8322-3129-6 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized
22、 distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 61788-4:2016 IEC 2016 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope 7 2 Normative references 7 3 Terms and definitions 7 4 Principle 8 5 Apparatus 8 5.1 Material of mea
23、surement mandrel or of measurement base plate 8 5.2 Diameter of the measurement mandrel and length of the measurement base plate . 8 5.3 Cryostat for the resistance (R 2 ) measurement . 9 6 Specimen preparation 9 7 Data acquisition and analysis 9 7.1 Resistance (R 1 ) at room temperature 9 7.2 Resis
24、tance (R 2or * 2 R ) just above the superconducting transition 9 7.2.1 Correction of strain effect 9 7.2.2 Data acquisition of cryogenic resistance 10 7.2.3 Optional acquisition methods . 12 7.3 Correction on measured * 2 R of Nb-Ti composite superconductor for bending strain 12 7.4 Residual resista
25、nce ratio (RRR) 12 8 Uncertainty and stability of the test method . 12 8.1 Temperature . 12 8.2 Voltage measurement . 12 8.3 Current . 13 8.4 Dimension . 13 9 Test report . 13 9.1 RRR value 13 9.2 Specimen 13 9.3 Test conditions . 14 9.3.1 Measurements of R 1and R 2. 14 9.3.2 Measurement of R 114 9.
26、3.3 Measurement of R 214 Annex A (informative) Additional information relating to the measurement of RRR . 15 A.1 Recommendation on specimen mounting orientation . 15 A.2 Alternative methods for increasing temperature of specimen above superconducting transition temperature 15 A.3 Alternative measur
27、ement methods of R 2or * 2 R . 15 A.4 Bending strain dependency of RRR for Nb-Ti composite superconductor 18 A.5 Procedure of correction of bending strain effect 21 Annex B (informative) Uncertainty considerations 23 B.1 Overview. 23 B.2 Definitions. 23 B.3 Consideration of the uncertainty concept 2
28、3 IEC 61788-4:2016 IEC 2016 3 B.4 Uncertainty evaluation example for TC 90 standards . 25 Annex C (informative) Uncertainty evaluation in test method of RRR for Nb-Ti and Nb 3 Sn composite superconductors . 27 C.1 Evaluation of uncertainty . 27 C.2 Summary of round robin test of RRR of a Nb-Ti compo
29、site superconductor . 30 C.3 Reason for large COV value in the intercomparison test on Nb 3 Sn composite superconductor . 31 Bibliography 32 Figure 1 Relationship between temperature and resistance 8 Figure 2 Voltage versus temperature curves and definitions of each voltage 10 Figure A.1 Definition
30、of voltages 17 Figure A.2 Bending strain dependency of RRR value for pure Cu matrix of Nb-Ti composite superconductors (comparison between measured values and calculated values) 19 Figure A.3 Bending strain dependency of RRR value for round Cu wires 19 Figure A.4 Bending strain dependency of normali
31、zed RRR value for round Cu wires 20 Figure A.5 Bending strain dependency of RRR value for rectangular Cu wires . 20 Figure A.6 Bending strain dependency of normalized RRR value for rectangular Cu wires . 21 Figure C.1 Distribution of observed r RRRof Cu/Nb-Ti composite superconductor . 31 Table A.1
32、Minimum diameter of the measurement mandrel for round wires 21 Table A.2 Minimum diameter of the measurement mandrel for rectangular wires 21 Table B.1 Output signals from two nominally identical extensometers 24 Table B.2 Mean values of two output signals . 24 Table B.3 Experimental standard deviat
33、ions of two output signals 24 Table B.4 Standard uncertainties of two output signals 25 Table B.5 COV values of two output signals . 25 Table C.1 Uncertainty of each measurement 30 Table C.2 Obtained values of R 1 , R 2and r RRRfor three Nb 3 Sn samples 31 4 IEC 61788-4:2016 IEC 2016 INTERNATIONAL E
34、LECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY Part 4: Residual resistance ratio measurement Residual resistance ratio of Nb-Ti and Nb 3 Sn composite superconductors FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all nationa
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45、tifying any or all such patent rights. International Standard IEC 61788-4 has been prepared by IEC technical committee 90: Superconductivity. This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision. This edition includes the followi
46、ng significant technical changes with respect to the previous edition: a) the unification of similar test methods for residual resistance ratio (RRR) of Nb-Ti and Nb 3 Sn composite superconductors, the latter of which is described in IEC 61788-11. IEC 61788-4:2016 IEC 2016 5 The text of this standar
47、d is based on the following documents: FDIS Report on voting 90/359/FDIS 90/360/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
48、 A list of all parts of the IEC 61788 series, published under the general title Superconductivity, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC website under “http:/webstore.iec.ch
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