EN 61788-2:2007
(Main)Superconductivity - Part 2: Critical current measurement - DC critical current of Nb3Sn composite superconductors
Superconductivity - Part 2: Critical current measurement - DC critical current of Nb3Sn composite superconductors
This part of IEC 61788 covers a test method for the determination of the d.c. critical current of Nb3Sn composite superconductors which are fabricated by either the bronze process or the internal tin diffusion process and have a copper/non-copper ratio larger than 0,2. This method is intended for use with superconductors which have critical currents of less than 1 000 A and n-values larger than 12 under standard test conditions and at magnetic fields of less than or equal to 0,7 times the upper critical magnetic field. The test specimen is immersed in a liquid helium bath at a known temperature during testing. The Nb3Sn composite test conductor has a monolithic structure with a total round-cross-sectional area that is less than 2 mm2. The specimen geometry used in this test method is an inductively coiled specimen. Deviations from this test method which are allowed for routine tests and other specific restrictions are given in this standard. Nb3Sn conductors with critical currents above 1 000 A or total cross-sectional areas greater than 2 mm2 can be measured with the present method with an anticipated reduction in precision and a more significant self-field effect (see Annex C). Other, more specialized, specimen test geometries may be more appropriate for larger conductor testing which have been omitted from this present standard for simplicity and to retain precision. The test method given in this standard should in principle apply to Nb3Sn composite wires fabricated by any other process. This method is also expected to apply to other superconducting composite wires after some appropriate modifications.
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
La présente partie de la CEI 61788 traite d'une méthode d'essai pour la détermination du courant critique continu des supraconducteurs composites Nb3Sn qui sont fabriqués soit par le procédé du bronze, soit par le procédé de diffusion interne de l'étain, et dont le rapport cuivre/non-cuivre est supérieur à 0,2. La présente méthode est destinée à être utilisée avec des supraconducteurs caractérisés par des courants critiques inférieurs à 1 000 A et des valeurs n supérieures à 12 dans des conditions d'essai normalisées et avec des champs magnétiques inférieurs ou égaux à 0,7 fois la valeur du champ magnétique critique le plus élevé. Le spécimen d'essai est immergé dans un bain d'hélium liquide à une température mesurée pendant l'essai. Le conducteur d'essai composite Nb3Sn a une structure monolithique avec une surface de section ronde totale inférieure à 2 mm2. Le spécimen utilisé dans la présente méthode d'essai a la forme d'une bobine inductive. La présente norme indique les écarts par rapport à la méthode d'essai permis dans des essais individuels de série et d'autres restrictions spécifiques. Les conducteurs Nb3Sn ayant des courants critiques supérieurs à 1 000 A ou des surfaces de section supérieure à 2 mm2 peuvent être mesurés avec la présente méthode avec une réduction anticipée de précision et un effet de champ induit plus significatif (voir Annexe C). D'autres formes d'essai, plus spécialisées, peuvent être mieux appropriées pour des essais de conducteurs de plus grande taille qui ont été omis dans la présente norme dans un souci de simplicité et de précision. En principe, il convient que la méthode d'essai indiquée dans la présente norme s'applique aux fils composites Nb3Sn fabriqués selon un autre procédé. Cette méthode est également supposée adaptable à d'autres fils supraconducteurs composites après des modifications appropriées.
Superprevodnost - 2. del: Meritve kritičnega toka - Enosmerni kritični tok pri superprevodnikih iz Nb3Sn kompozita (IEC 61788-2:2006)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2008
1DGRPHãþD
SIST EN 61788-2:2001
6XSHUSUHYRGQRVWGHO 0HULWYHNULWLþQHJDWRND(QRVPHUQLNULWLþQLWRNSUL
VXSHUSUHYRGQLNLKL]1E6QNRPSR]LWD ,(&
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.
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© 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
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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.
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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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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
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