EN 61788-4:2016
(Main)Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors
Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti and Nb3Sn composite superconductors
IEC 61788-4:2016 specifies a test method for the determination of the residual resistance ratio (RRR) of Nb-Ti and Nb3Sn composite superconductors with Cu, Cu-Ni, Cu/Cu-Ni and Al matrix. This method is intended for use with superconductor specimens that have a monolithic structure with rectangular or round cross-section, RRR value less than 350, and cross-sectional area less than 3 mm2. In the case of Nb3Sn, the specimens have received a reaction heat-treatment. This fourth edition cancels and replaces the third edition published in 2011. This edition constitutes a technical revision.
Supraleitfähigkeit - Teil 4: Messung des Restwiderstandsverhältnisses - Restwiderstandsverhältnis von Nb-Ti und Nb3Sn Verbundsupraleitern
Supraconductivité - Partie 4: Mesurage du rapport de résistance résiduelle - Rapport de résistance résiduelle des composites supraconducteurs de Nb-Ti et de Nb3Sn
L'IEC 61788-4:2016 spécifie une méthode d'essai pour la détermination du rapport de résistance résiduelle (RRR) des composites supraconducteurs de Nb-Ti et de Nb3Sn avec une matrice de Cu, Cu-Ni, Cu/Cu-Ni et Al. Cette méthode est destinée à être utilisée avec des éprouvettes de supraconducteurs présentant une structure monolithique avec une section rectangulaire ou circulaire, un RRR de valeur inférieure à 350 et une surface de section inférieure à 3 mm2. Dans le cas de Nb3Sn, les éprouvettes ont subi un traitement thermique de réaction. Cette quatrième édition annule et remplace la troisième édition parue en 2011. Cette édition constitue une révision technique.
Superprevodnost - 4. del: Meritve razmerja preostale upornosti - Preostala upornost za superprevodnike iz kompozita Nb-Ti in Nb3Sn (IEC 61788-4:2016)
Ta del standarda IEC 61788 opredeljuje preskusno metodo za določanje razmerja preostale upornosti
(RRR) za superprevodnike iz kompozita Nb-Ti in Nb3Sn z matrico Cu, Cu-Ni, Cu/Cu-Ni
in Al. Ta metoda je namenjena za uporabo z vzorci superprevodnikov z monolitno
strukturo s pravokotnim in okroglim prerezom, vrednostjo RRR, manjšo od 350, in prečnim
prerezom, manjšim od 3 mm2. V primeru Nb3Sn so vzorci
toplotno obdelani.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2016
1DGRPHãþD
SIST EN 61788-4:2011
Superprevodnost - 4. del: Meritve razmerja preostale upornosti - Preostala
upornost za superprevodnike iz kompozita Nb-Ti in Nb3Sn (IEC 61788-4:2016)
Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance
ratio of Nb-Ti and Nb3Sn composite superconductors (IEC 61788-4:2016)
Ta slovenski standard je istoveten z: EN 61788-4:2016
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
29.050 Superprevodnost in prevodni Superconductivity and
materiali conducting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 61788-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2016
ICS 17.200.20; 29.050 Supersedes EN 61788-4:2011
English Version
Superconductivity - Part 4: Residual resistance ratio
measurement - Residual resistance ratio of Nb-Ti and Nb3Sn
composite superconductors
(IEC 61788-4:2016)
Supraconductivité - Partie 4: Mesurage du rapport de Supraleitfähigkeit - Teil 4: Messung des
résistance résiduelle - Rapport de résistance résiduelle des Restwiderstandsverhältnisses - Restwiderstandsverhältnis
composites supraconducteurs de Nb-Ti et de Nb3Sn von Nb-Ti und Nb3Sn Verbundsupraleitern
(IEC 61788-4:2016) (IEC 61788-4:2016)
This European Standard was approved by CENELEC on 2016-02-23. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61788-4:2016 E
European foreword
The text of document 90/359/FDIS, future edition 4 of IEC 61788-4, prepared by IEC/TC 90
"Superconductivity" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
(dop) 2016-11-23
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
• latest date by which the national standards conflicting with (dow) 2019-02-23
the document have to be withdrawn
This document supersedes EN 61788-4:2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 61788-4:2016 was approved by CENELEC as a European
Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-815 - International Electrotechnical Vocabulary - -
(IEV) -- Part 815: Superconductivity
IEC 61788-4 ®
Edition 4.0 2016-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Superconductivity –
Part 4: Residual resistance ratio measurement – Residual resistance ratio of
Nb-Ti and Nb Sn composite superconductors
Supraconductivité –
Partie 4: Mesurage du rapport de résistance résiduelle – Rapport de résistance
résiduelle des composites supraconducteurs de Nb-Ti et de Nb Sn
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 29.050 ISBN 978-2-8322-3129-6
– 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 measurement 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 ) measurement . 9
6 Specimen preparation . 9
7 Data acquisition and analysis . 9
7.1 Resistance (R ) at room temperature . 9
*
7.2 Resistance (R or R ) just above the superconducting transition . 9
2 2
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 R of Nb-Ti composite superconductor for bending
strain . 12
7.4 Residual resistance 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 and R . 14
1 2
9.3.2 Measurement of R . 14
9.3.3 Measurement of R . 14
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 measurement methods of R or R . 15
2 2
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 . 23
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 Sn composite superconductors . 27
C.1 Evaluation of uncertainty . 27
C.2 Summary of round robin test of RRR of a Nb-Ti composite superconductor . 30
C.3 Reason for large COV value in the intercomparison test on Nb 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 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 normalized 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 of Cu/Nb-Ti composite superconductor . 31
RRR
Table A.1 – 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 deviations 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 , R and r for three Nb Sn samples . 31
1 2 RRR 3
– 4 – IEC 61788-4:20
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