Superconductivity - Part 11: Residual resistance ratio measurement - Residual resistance ratio of Nb3Sn composite superconductors

Covers a test method for the determination of the residual resistance ratio (RRR) of Nb3Sn composite conductors. This method is intended for use with superconductor specimens that have a monolithic structure with a rectangular or round cross section, RRR less than 350 and cross-sectional area less than 3 mm2, and have received a reaction heat-treatment. Ideally, it is intended that the specimens are as straight as possible; however, this is not always the case, thus care must be taken to measure the specimen in its as received condition. All measurements are done without an applied magnetic field. The method described in the body of this standard is the reference method; optional acquisition methods are outlined in Annex A.

Supraleitfähigkeit - Teil 11: Messung des Restwiderstandsverhältnisses - Restwiderstandsverhältnis von Nb3Sn-Verbundsupraleitern

Supraconductivité - Partie 11: Mesure du rapport de résistance résiduelle - Rapport de résistance résiduelle des supraconducteurs composites de Nb3Sn

Spécifie une méthode d'essai pour la détermination du rapport de résistance résiduelle (RRR) des conducteurs composites de Nb3Sn. Cette méthode est destinée à être utilisée avec des éprouvettes de supraconducteurs présentant une structure monolithique avec une section rectangulaire ou circulaire, un rapport RRR inférieur à 350, une surface de section inférieure à 3 mm2, et qui ont reçu un traitement thermique de réaction. Dans l'absolu, il est prévu que les éprouvettes soient aussi droites que possible; cependant, ce n'est pas toujours le cas, c'est pourquoi il faut s'assurer que la mesure est effectuée sur des éprouvettes en l'état de livraison. Toutes les mesures sont effectuées sans appliquer de champ magnétique. La méthode décrite dans le corps de texte de la présente norme est la méthode de "référence"; des méthodes d'acquisition facultatives sont présentées à l'annexe A.

Superconductivity - Part 11: Residual resistance ratio measurement - Residual resistance ratio of Nb3Sn composite superconductors

General Information

Status
Withdrawn
Publication Date
10-Apr-2003
Technical Committee
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Start Date
11-Apr-2003
Completion Date
11-Apr-2003

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SLOVENSKI SIST EN 61788-11:2003
STANDARD
oktober 2003
Superconductivity - Part 11: Residual resistance ratio measurement - Residual
resistance ratio of Nb3Sn composite superconductors
ICS 17.220.20; 29.050 Referenčna številka
SIST EN 61788-11:2003(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN 61788-11
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2003
ICS 17.220; 29.050
English version
Superconductivity
Part 11: Residual resistance ratio measurement -
Residual resistance ratio of Nb Sn composite superconductors
(IEC 61788-11:2003)
Supraconductivité Supraleitfähigkeit
Partie 11: Mesure du rapport Teil 11: Messung des
de résistance résiduelle - Restwiderstandsverhältnisses -
Rapport de résistance résiduelle Restwiderstandsverhältnis von
des supraconducteurs composites Nb Sn-Verbundsupraleitern
de Nb Sn (IEC 61788-11:2003)
(CEI 61788-11:2003)

This European Standard was approved by CENELEC on 2003-03-01. 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, Czech Republic,

Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,

Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and 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

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61788-11:2003 E
---------------------- Page: 2 ----------------------
EN 61788-11:2003 - 2 -
Foreword

The text of document 90/131/FDIS, future edition 1 of IEC 61788-11, prepared by IEC TC 90,

Superconductivity, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC

as EN 61788-11 on 2003-03-01.
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) 2003-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-03-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annex ZA is normative and annex A is informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 61788-11:2003 was approved by CENELEC as a European

Standard without any modification.
__________
---------------------- Page: 3 ----------------------
- 3 - EN 61788-11:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

This European Standard incorporates by dated or undated reference, provisions from other

publications. These normative references are cited at the appropriate places in the text and the

publications are listed hereafter. For dated references, subsequent amendments to or revisions of any

of these publications apply to this European Standard only when incorporated in it by amendment or

revision. For undated references the latest edition of the publication referred to applies (including

amendments).

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 - International Electrotechnical - -
Vocabulary (IEV)
Chapter 815: Superconductivity
Undated reference.
---------------------- Page: 4 ----------------------
NORME CEI
INTERNATIONALE IEC
61788-11
INTERNATIONAL
Première édition
STANDARD
First edition
2003-01
Supraconductivité –
Partie 11:
Mesure du rapport de résistance résiduelle –
Rapport de résistance résiduelle des
supraconducteurs composites de Nb Sn
Superconductivity –
Part 11:
Residual resistance ratio measurement –
Residual resistance ratio of Nb Sn composite
superconductors
© IEC 2003 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
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61788-11 © IEC:2003 – 3 –
CONTENTS

FOREWORD .......................................................................................................................... 5

INTRODUCTION ....................................................................................................................7

1 Scope .............................................................................................................................. 9

2 Normative references....................................................................................................... 9

3 Terms and definitions ...................................................................................................... 9

4 Requirements .................................................................................................................11

5 Apparatus .......................................................................................................................11

5.1 Material of measuring base plate ...........................................................................11

5.2 Length of the measuring base plate .......................................................................11

5.3 Cryostat for the resistance R measurement..........................................................11

6 Specimen preparation.....................................................................................................11

7 Data acquisition ..............................................................................................................11

7.1 Resistance (R ) at room temperature.....................................................................11

7.2 Resistance (R ) just above the superconducting transition.....................................13

7.3 Residual resistance ratio (RRR).............................................................................15

8 Accuracy and stability in the test method ........................................................................17

8.1 Temperature..........................................................................................................17

8.2 Voltage measurement............................................................................................17

8.3 Current ..................................................................................................................17

9 Test report......................................................................................................................17

9.1 Specimen ..............................................................................................................17

9.2 Report of RRR values ............................................................................................17

9.3 Report of test conditions ........................................................................................17

Annex A (informative) Additional information relating to measurement of RRR .....................23

Figure 1 – Relationship between temperature and voltage ....................................................21

Figure 2 – Voltage versus temperature curves and definition of each voltage........................21

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61788-11 © IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SUPERCONDUCTIVITY –
Part 11: Residual resistance ratio measurement –
Residual resistance ratio of Nb Sn composite superconductors
FOREWORD

1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, the IEC publishes International Standards. Their preparation is

entrusted to technical committees; any IEC National Committee interested in the subject dealt with may

participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. The IEC collaborates closely with the International

Organization for Standardization (ISO) in accordance with conditions determined by agreement between the

two organizations.

2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an

international consensus of opinion on the relevant subjects since each technical committee has representation

from all interested National Committees.

3) The documents produced have the form of recommendations for international use and are published in the form

of standards, technical specifications, technical reports or guides and they are accepted by the National

Committees in that sense.

4) In order to promote international unification, IEC National Committees undertake to apply IEC International

Standards transparently to the maximum extent possible in their national and regional standards. Any

divergence between the IEC Standard and the corresponding national or regional standard shall be clearly

indicated in the latter.

5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with one of its standards.

6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject

of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61788-11 has been prepared by IEC Technical Committee 90:

Superconductivity.
The text of this standard is based on the following documents:
FDIS Report on voting
90/131/FDIS 90/134/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.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this publication will remain unchanged until 2007.

At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
61788-11 © IEC:2003 – 7 –
INTRODUCTION

Copper or aluminium is used as stabilizer material in multifilamentary Nb Sn superconductors

and works as an electrical shunt when the superconductivity is interrupted. It also contributes

to recovery of the superconductivity by conducting the heat generated in the superconductor

to the surrounding coolant. The resistivity of copper used in the composite superconductor in

the cryogenic temperature region is an important quantity which influences the stability of

the superconductor. The residual resistance ratio is defined as a ratio of the resistance of the

superconductor at room temperature to that just above the superconducting transition.

In this International Standard, the test method for the residual resistance ratio of Nb Sn

composite superconductors is described. The curve method is employed for the measurement

of the resistance just above the superconducting transition. Other methods are described in

clause A.2.
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61788-11 © IEC:2003 – 9 –
SUPERCONDUCTIVITY –
Part 11: Residual resistance ratio measurement –
Residual resistance ratio of Nb Sn composite superconductors
1 Scope

This part of IEC 61788 covers a test method for the determination of the residual resistance

ratio (RRR)of Nb Sn composite conductors. This method is intended for use with

superconductor specimens that have a monolithic structure with a rectangular or round cross

section, RRR less than 350 and cross-sectional area less than 3 mm , and have received a

reaction heat-treatment. Ideally, it is intended that the specimens are as straight as possible;

however, this is not always the case, thus care must be taken to measure the specimen in its

as received condition. All measurements are done without an applied magnetic field.

The method described in the body of this standard is the “reference” method; optional

acquisition methods are outlined in Annex A.
2 Normative references

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.

IEC 60050-815, International Electrotechnical Vocabulary (IEV) – Part 815: Superconductivity

3 Terms and definitions

For the purposes of this part of IEC 61788, the terms and definitions given in IEC 60050-815

and the following apply.
3.1
residual resistance ratio
RRR (abbreviation)

the ratio of resistance at room temperature to the resistance just above the superconducting

transition

The residual resistance ratio of the composite wire is obtained in equation (1) below, where

the resistance (R ) at room temperature (20 °C) is divided by the resistance (R ) just above

1 2
the superconducting transition.
RRR = (1)

Figure 1 shows schematically a voltage versus temperature curve acquired on a specimen

while measuring cryogenic resistance. Draw a line in Figure 1 where the voltage sharply

increases (a), and draw also a line in Figure 1 where the voltage increases gradually (b) with

temperature. The value of resistance at the intersection of these two lines, A, is defined as

resistance (R ) just above the superconducting transition.
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61788-11 © IEC:2003 – 11 –
4 Requirements

The resistance measurement both at room and cryogenic temperatures shall be performed

with the four-probe technique.

The target precision of this method is that the coefficient of variation (COV) in the

intercomparison test shall be 5 % or less (see clause A.3).
5 Apparatus
5.1 Material of measuring base plate

Material of the measuring base plate shall be copper, aluminum, silver or the like whose

thermal conductivity is equal to or better than 100 W/(m⋅K) at liquid helium temperature

(4,2 K). The surface of the material shall be covered with an insulating layer (tape or a layer

made of mylar, polyester, polytetrafluoroethylene, etc.) whose thickness is 0,1 mm or less.

5.2 Length of the measuring base plate
The measuring base plate shall be at least 30 mm long in one dimension.
5.3 Cryostat for the resistanc
...

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