EN 61788-2:2007

SLOVENSKI STANDARD
01-januar-2008
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SIST EN 61788-2:2001
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Superconductivity - Part 2: Critical current measurement - DC critical current of Nb3Sn
composite superconductors
Supraleitfähigkeit - Teil 2: Messen des kritischen Stromes Kritischer Strom (Gleichstrom)
von Nb3Sn-Verbundsupraleitern
Supraconductivité - Partie 2: Mesure du courant critique - Courant critique continu des
supraconducteurs composites Nb3Sn
Ta slovenski standard je istoveten z: EN 61788-2:2007
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 61788-2
NORME EUROPÉENNE
January 2007
EUROPÄISCHE NORM
ICS 17.220; 29.050 Supersedes EN 61788-2:1999

English version
Superconductivity
Part 2: Critical current measurement -
DC critical current of Nb Sn composite superconductors
(IEC 61788-2:2006)
Supraconductivité  Supraleitfähigkeit
Partie 2: Mesure du courant critique - Teil 2: Messen des kritischen Stromes -
Courant critique continu des Kritischer Strom (Gleichstrom)
supraconducteurs composites Nb Sn von Nb Sn-Verbundsupraleitern
3 3
(CEI 61788-2:2006) (IEC 61788-2:2006)

This European Standard was approved by CENELEC on 2006-12-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61788-2:2007 E
Foreword
The text of document 90/195/FDIS, future edition 2 of IEC 61788-2, prepared by IEC TC 90,
Superconductivity, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61788-2 on 2006-12-01.
This European Standard supersedes EN 61788-2:1999.
Modifications made to EN 61788-2:1999 are mostly wording that essentially includes no technical
changes and an addition of a new annex (normative Annex D) in which the specifications in the
one-mandrel method are described.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-09-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-12-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61788-2:2006 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 61788-1 NOTE  Harmonized as EN 61788-1:2007 (not modified).
__________
- 3 - EN 61788-2:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

IEC 60050-815 2000 International Electrotechnical Vocabulary - -
(IEV)
Part 815: Superconductivity
NORME CEI
INTERNATIONALE
IEC
61788-2
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2006-11
Supraconductivité –
Partie 2:
Mesure du courant critique –
Courant critique continu des
supraconducteurs composites Nb Sn
Superconductivity –
Part 2:
Critical current measurement –
DC critical current of Nb Sn
composite superconductors
© IEC 2006 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

61788-2 © IEC:2006 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11

1 Scope.13
2 Normative references .13
3 Terms and definitions .15
4 Principle .17
5 Requirements .17
6 Apparatus.19
6.1 Reaction mandrel material.19
6.2 Reaction mandrel construction .19
6.3 Measurement mandrel material .21
6.4 Measurement mandrel construction .21
6.5 Measurement set up.21
7 Specimen preparation.21
7.1 Specimen mounting for reaction heat treatment.21
7.2 Reaction heat treatment.23
7.3 Specimen mounting for measurement.23
7.4 Specimen bonding.23
8 Measurement procedure.25
9 Precision and accuracy of the test method.27
9.1 Critical current.27
9.2 Temperature.27
9.3 Magnetic field.27
9.4 Specimen support structure.27
9.5 Specimen protection.27
10 Calculation of results .29
10.1 Critical current criteria .29
10.2 n-value (optional calculation, refer to A.7.2) .31
11 Test report.31
11.1 Identification of test specimen .31
11.2 Report of I values .31
c
11.3 Report of test conditions.33

Annex A (informative) Additional information relating to Clauses 1 to 10 .35
Annex B (informative) Strain effect of Nb Sn conductors .59
Annex C (informative) Self-field effect.63
Annex D (normative) One-mandrel method .67

Bibliography.73

61788-2 © IEC:2006 – 5 –
Figure 1 – Intrinsic U-I characteristic .29
Figure 2 – U-I characteristic with a current transfer component.29
Figure A.1 – Instrumentation of specimen with a null voltage tap pair .45
Figure B.1 – Uniaxial (tensile) strain dependence of critical current for a typical Nb Sn
composite wire shown with various magnetic fields [7] .61

Table A.1 – Thermal contraction data of Nb Sn superconductor and selected materials .57
61788-2 © IEC:2006 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SUPERCONDUCTIVITY –
Part 2: Critical current measurement –
DC critical current of Nb Sn composite superconductors
FOREWORD
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