EN 61788-4:2007
(Main)Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti composite superconductors
Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance ratio of Nb-Ti composite superconductors
Describes a reference method for the determination of the residual resistance ratio (RRR) of a composite superconductor comprised of Nb-Ti filaments and Cu, Cu-Ni or Cu/Cu-Ni matrix. This method is intended for use with superconductors that have a rectangular or round cross-section, RRR less than 350, and cross-sectional area less than 3 mm2. All measurements shall be done without an applied magnetic field. Optional acquisition methods are outlined in annex A.
Supraleitfähigkeit - Teil 4: Messungen des Restwiderstandsverhältnisses - Restwiderstandsverhältnis von Nb-Ti-Verbundsupraleitern
Supraconductivité - Partie 4: Mesure de la résistivité résiduelle - Taux de résistivité résiduelle des supraconducteurs composites au Nb-Ti
Superprevodnost - 4. del: Meritve razmerja preostale upornosti - Preostala upornost za superprevodnike iz kompozita Nb-Ti (IEC 61788-4:2007)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2008
1DGRPHãþD
SIST EN 61788-4:2002
Superprevodnost - 4. del: Meritve razmerja preostale upornosti - Preostala
upornost za superprevodnike iz kompozita Nb-Ti (IEC 61788-4:2007)
Superconductivity - Part 4: Residual resistance ratio measurement - Residual resistance
ratio of Nb-Ti composite superconductors
Supraleitfähigkeit - Teil 4: Messungen des Restwiderstandsverhältnisses –
Restwiderstandsverhältnis von Nb-Ti-Verbundsupraleitern
Supraconductivité - Partie 4: Mesure de la résistivité résiduelle - Taux de résistivité
résiduelle des supraconducteurs composites au Nb-Ti
Ta slovenski standard je istoveten z: EN 61788-4:2007
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 61788-4
NORME EUROPÉENNE
July 2007
EUROPÄISCHE NORM
ICS 17.220.20; 29.050 Supersedes EN 61788-4:2001
English version
Superconductivity -
Part 4: Residual resistance ratio measurement -
Residual resistance ratio of Nb-Ti composite superconductors
(IEC 61788-4:2007)
Supraconductivité - Supraleitfähigkeit -
Partie 4: Mesure Teil 4: Messungen
de la résistivité résiduelle - des Restwiderstandsverhältnisses –
Taux de résistivité résiduelle Restwiderstandsverhältnis
des supraconducteurs composites von Nb-Ti-Verbundsupraleitern
au Nb-Ti (IEC 61788-4:2007)
(CEI 61788-4:2007)
This European Standard was approved by CENELEC on 2007-07-01. 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, Bulgaria, 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 61788-4:2007 E
Foreword
The text of document 90/203/FDIS, future edition 2 of IEC 61788-4, prepared by IEC TC 90,
Superconductivity, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61788-4 on 2007-07-01.
This European Standard supersedes EN 61788-4:2001.
The main revisions are the replacement of "accuracy" by "uncertainty" and a change in Figure 1, where
the relationship between temperature and voltage is changed to the relationship between temperature
and resistance.
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) 2008-04-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-07-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61788-4:2007 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 61788-4:2007
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
1)
IEC 60050-815 - International Electrotechnical Vocabulary - -
(IEV) -
Part 815: Superconductivity
1)
Undated reference.
INTERNATIONAL IEC
STANDARD 61788-4
Second edition
2007-04
Superconductivity –
Part 4:
Residual resistance ratio measurement –
Residual resistance ratio of Nb-Ti
composite superconductors
PRICE CODE
Commission Electrotechnique Internationale T
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
– 2 – 61788-4 © IEC:2007(E)
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms and definition.6
4 Requirements .7
5 Apparatus.7
5.1 Material of measuring mandrel or of measuring base plate .7
5.2 Diameter of the measuring mandrel and length of the measuring base plate.7
5.3 Cryostat for the resistance, R , measurement .8
6 Specimen preparation.8
7 Data acquisition and analysis .8
7.1 Resistance (R ) at room temperature .8
7.2 Resistance (R *) just above the superconducting transition.8
7.3 Correction on measured R * for bending strain.11
7.4 Residual resistance ratio (RRR) .11
8 Uncertainty and stability of the test method .11
8.1 Temperature.11
8.2 Voltage measurement.11
8.3 Current.11
8.4 Dimension .12
9 Test report.12
9.1 RRR value.12
9.2 Specimen .12
9.3 Test conditions.12
9.3.1 Report of test conditions.12
9.3.2 Report of R .13
9.3.3 Report of R .13
Annex A (informative) Additional information relating to the measurement of RRR .
Annex B (informative) Statistical definitions .22
Figure 1 – Relationship between temperature and resistance .7
Figure 2 – Voltage versus temperature curves and definitions of each voltage.9
Figure A.1 – Bending strain dependency of RRR for pure Cu matrix of Nb-Ti composite
superconductors (comparison between measured values and calculated values) .15
Figure A.2 – Bending strain dependency of RRR for round Cu wires .15
Figure A.3 – Bending strain dependency of normalized RRR for round Cu wires .16
Figure A.4 – Bending strain dependency of RRR for rectangular Cu wires .16
Figure A.5 – Bending strain dependency of normalized RRR for rectangular Cu wires .17
Figure A.6 – Distribution of observed RRR of Cu/Nb-Ti composite superconductor .19
Figure A.7 – Definition of voltages .20
61788-4 © IEC:2007(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
SUPERCONDUCTIVITY –
Part 4: Residual resistance ratio measurement –
Residual resistance ratio of Nb-Ti composite superconductors
FOREWORD
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International Standard IEC 61788-4 has been prepared by IEC technical committee 90:
Superconductivity.
This second edition cancels and replaces the first edition published in 2001. It constitutes a
technical revision. The main revisions are the replacement of “accuracy” by “uncertainty” and
a change in Figure 1, where the relationship between temperature and voltage is changed to
the relationship between temperature and resistance.
The text of this standard is based on the following documents:
FDIS Report on voting
90/203/FDIS 90/205/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.
– 4 – 61788-4 © IEC:2007(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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 maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication
...
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