EN IEC 61788-4:2020
(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 61788-4:2020 is available as IEC 61788-4:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61788-4:2020 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 in a strain-free condition and zero external magnetic field. 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 fifth edition cancels and replaces the fourth edition published in 2016. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) change in the suitable distance of voltage taps on the specimen for reliable measurement, b) new report on the result of the round robin test of the residual resistance ratio of Nb3Sn superconductors that proves the validity of the measurement method in this standard, c) revision of the confusing definitions of the copper ratio and copper fraction.
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
IEC 61788-4:2020 est disponible sous forme de IEC 61788-4:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.IEC 61788-4:2020 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 dans une condition sans contrainte et dans un champ magnétique externe nul. 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 cinquième édition annule et remplace la quatrième édition parue en 2016. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: a) modification de la distance adéquate des prises de tension sur les éprouvettes pour un mesurage fiable, b) nouveau rapport du résultat de l’essai interlaboratoire du rapport de résistance résiduelle des supraconducteurs Nb3Sn qui atteste de la validité de la méthode de mesure utilisée dans la présente norme, c) révision des définitions prêtant à confusion concernant le rapport entre le cuivre et la fraction de cuivre.
Superprevodnost - 4. del: Meritve razmerja preostale upornosti - Preostala upornost za superprevodnike iz kompozita Nb-Ti in Nb3Sn (IEC 61788-4:2020)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-julij-2020
Nadomešča:
SIST EN 61788-4:2016
Superprevodnost - 4. del: Meritve razmerja preostale upornosti - Preostala
upornost za superprevodnike iz kompozita Nb-Ti in Nb3Sn (IEC 61788-4:2020)
Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance
ratio of Nb-Ti and Nb3Sn composite superconductors (IEC 61788-4:2020)
Supraleitfähigkeit - Teil 4: Messung des Restwiderstandsverhältnisses -
Restwiderstandsverhältnis von Nb-Ti und Nb3Sn Verbundsupraleitern (IEC 61788-
4:2020)
Supraconductivité - Partie 4: Mesurage du rapport de résistance résiduelle - Rapport de
résistance résiduelle des composites supraconducteurs de Nb-Ti et de Nb3Sn (IEC
61788-4:2020)
Ta slovenski standard je istoveten z: EN IEC 61788-4:2020
ICS:
17.200.20 Instrumenti za merjenje Temperature-measuring
temperature instruments
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 IEC 61788-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 17.220.20; 29.050 Supersedes EN 61788-4:2016 and all of its amendments
and corrigenda (if any)
English Version
Superconductivity - Part 4: Residual resistance ratio
measurement - Residual resistance ratio of Nb-Ti and Nb3Sn
composite superconductors
(IEC 61788-4:2020)
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 61788-4:2020) (IEC 61788-4:2020)
This European Standard was approved by CENELEC on 2020-04-24. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61788-4:2020 E
European foreword
The text of document 90/448/FDIS, future edition 5 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:
• latest date by which the document has to be implemented at national (dop) 2021-01-24
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-04-24
document have to be withdrawn
This document supersedes EN 61788-4:2016 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61788-4:2020 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 are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where 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 - - -
Part 815: Superconductivity
IEC 61788-4 ®
Edition 5.0 2020-03
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 978-2-8322-7916-8
– 2 – IEC 61788-4:2020 © IEC 2020
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 . 9
5.3 Cryostat for the resistance ( ) measurement . 9
R
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 . 10
2 2
7.2.1 Correction of strain effect . 10
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 . 13
8.1 Temperature . 13
8.2 Voltage . 13
8.3 Current . 13
8.4 Dimension . 13
9 Test report . 13
9.1 RRR value . 13
9.2 Specimen . 14
9.3 Test conditions . 14
9.3.1 Measurements of R and R . 14
1 2
9.3.2 Measurement of R . 15
9.3.3 Measurement of R . 15
Annex A (informative) Additional information relating to the measurement of RRR . 16
A.1 Recommendation on specimen mounting orientation . 16
A.2 Alternative methods for increasing temperature of specimen above
superconducting transition temperature . 16
*
A.3 Alternative measurement methods of R or R . 16
2 2
A.4 Bending strain dependency of RRR for Nb-Ti composite superconductor . 19
A.5 Procedure of correction of bending strain effect . 22
Annex B (informative) Uncertainty considerations . 24
B.1 Overview. 24
B.2 Definitions. 24
IEC 61788-4:2020 © IEC 2020 – 3 –
B.3 Consideration of the uncertainty concept . 24
B.4 Uncertainty evaluation example for IEC TC 90 standards . 26
Annex C (informative) Uncertainty evaluation in test method of RRR for Nb-Ti and
Nb Sn composite superconductors . 28
C.1 Evaluation of uncertainty . 28
C.2 Summary of round robin test of RRR of a Nb-Ti composite superconductor . 31
C.3 Reason for large COV value in the intercomparison test on Nb Sn composite
superconductor . 32
Bibliography . 34
Figure 1 – Relationship between temperature and resistance. 8
Figure 2 – Voltage versus temperature curves and definitions of each voltage . 11
Figure A.1 – Definition of voltages . 18
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) . 20
Figure A.3 – Bending strain dependency of RRR value for round Cu wires . 20
Figure A.4 – Bending strain dependency of normalized RRR value for round Cu wires . 21
Figure A.5 – Bending strain dependency of RRR value for rectangular Cu wires . 21
Figure A.6 – Bending strain dependency of normalized RRR value for rectangular Cu
wires . 22
Figure C.1 – Distribution of observed r of Cu/Nb-Ti composite superconductor . 32
RRR
Table A.1 – Minimum diameter of the measurement mandrel for round wires . 22
Table A.2 – Minimum diameter of the measurement mandrel for rectangular wires. 22
Table B.1 – Output signals from two nominally identical extensometers . 25
Table B.2 – Mean values of two output signals . 25
Table B.3 – Experimental standard deviations of two output signals . 25
Table B.4 – Standard uncertainties of two output signals .
...
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