EN 61788-8:2010

Superconductivity - Part 8: AC loss measurements - Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method

IEC 61788-8:2010(E) specifies the measurement method of total AC losses by the pickup coil method in composite superconducting wires exposed to a transverse alternating magnetic field. The losses may contain hysteresis, coupling and eddy current losses. The standard method to measure only the hysteresis loss in DC or low-sweep-rate magnetic field is specified in IEC 61788-13. In metallic and oxide round superconducting wires expected to be mainly used for pulsed coil and AC coil applications, AC loss is generated by the application of time-varying magnetic field and/or current. The contribution of the magnetic field to the AC loss is predominant in usual electromagnetic configurations of the coil applications. For the superconducting wires exposed to a transverse alternating magnetic field, the present method can be generally used in measurements of the total AC loss in a wide range of frequency up to the commercial level, 50/60 Hz, at liquid helium temperature. For the superconducting wires with fine filaments, the AC loss measured with the present method can be divided into the hysteresis loss in the individual filaments, the coupling loss among the filaments and the eddy current loss in the normal conducting parts. In cases where the wires do not have a thick outer normal conducting sheath, the main components are the hysteresis loss and the coupling loss by estimating the former part as an extrapolated level of the AC loss per cycle to zero frequency in the region of lower frequency, where the coupling loss per cycle is proportional to the frequency. This second edition cancels and replaces the first edition published in 2003. This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below: - extending the applications of the pickup coil method to the a.c. loss measurements in metallic and oxide superconducting wires with a round cross section at liquid helium temperature, - using the word 'uncertainty' for all quantitative (associated with a number) statistical expressions and eliminating the quantitative use of 'precision' and 'accuracy'.

Supraleitfähigkeit - Teil 8: Messung der Wechselstromverluste - Messung der Gesamtwechselstromverluste von runden Supraleiterdrähten in transversalen magnetischen Wechselfeldern mit Hilfe eines Pickupspulenverfahrens bei der Temperatur von flüssigem Helium

Supraconductivité - Partie 8: Mesure des pertes en courant alternatif - Mesure de la perte totale en courant alternatif des fils supraconducteurs ronds exposés à un champ magnétique alternatif transverse par une méthode par bobines de détection

L'IEC 61788-8:2010 spécifie la méthode de mesure par bobines de détection des pertes totales en courant alternatif des fils supraconducteurs composites exposés à un champ magnétique alternatif transverse. Les pertes peuvent contenir des pertes par hystérésis et des pertes par courants de Foucault. La méthode normalisée permettant de mesurer uniquement les pertes par hystérésis en courant continu ou en champ magnétique à faible vitesse de balayage est spécifiée dans la CEI 61788-13. Dans les fils supraconducteurs ronds métalliques et en oxyde dont la principale utilisation attendue concerne les applications avec bobines pulsées et bobines en courant alternatif, les pertes en courant alternatif sont générées par application d'un champ magnétique et/ou d'un courant variables dans le temps. La contribution du champ magnétique aux pertes en courant alternatif est prédominante dans les configurations électromagnétiques habituelles des applications avec bobines. Pour les fils supraconducteurs exposés à un champ magnétique alternatif transverse, la présente méthode peut généralement être utilisée dans les mesures des pertes totales en courant alternatif dans une large gamme de fréquences allant jusqu'aux fréquences de distribution à 50/60 Hz, à la température de l'hélium liquide. Pour les fils supraconducteurs avec des filaments fins, les pertes en courant alternatif mesurées avec la présente méthode peuvent être divisées en pertes par hystérésis dans chacun des filaments, pertes par couplage entre les filaments et pertes par courants de Foucault dans les parties conductrices normales. Lorsque les fils ne comportent pas de gaine conductrice normale externe épaisse, les principales composantes sont les pertes par hystérésis et les pertes par couplage en estimant la première partie comme un niveau extrapolé des pertes en courant alternatif par cycle jusqu'à la fréquence nulle dans la région des fréquences inférieures, les pertes par couplage par cycle étant proportionnelles à la fréquence. Cette deuxième édition annule et remplace la première édition parue en 2003, dont elle constitue une révision technique. Les principales modifications par rapport à l'édition précédente sont: - l'extension des applications de la méthode par bobines de détection aux mesures des pertes en courant alternatif dans les fils supraconducteurs métalliques et en oxyde avec une section transversale ronde à la température de l'hélium liquide; et - l'utilisation du mot "incertitude" pour les expressions statistique en lieu et place du mot "précision". Mots clé: supraconductivité, TC90

Superprevodnost - 8. del: Meritve izmeničnih izgub - Meritve skupnih izmeničnih izgub okroglih superprevodnih žic, ki so izpostavljene transverzalnemu izmeničnemu magnetnemu polju pri temperaturi tekočega helija z odjemno tuljavo (IEC 61788-8:2010)

Ta del IEC 61788 določa merilno metodo izmeničnih izgub kompozitnih superprevodnih žic, ki so izpostavljene transverzalnemu izmeničnemu magnetnemu polju, z odjemno tuljavo. Izgube lahko vsebujejo histerezne izgube, izgube spojk in izgube vrtičnega toka. Standardna metoda za merjenje samo histereznih izgub enosmernega toka ali magnetnega polja z nizko hitrostjo valovanja, določenih v IEC 61788-13 [2]. V kovinskih in oksidnih okroglih žicah, za katere se pričakuje uporaba v glavnem za pulzne naprave s tuljavo in naprave, ki delujejo v izmeničnem toku s tuljavo, se izmenične izgube ustvarjajo z uporabo časovno spremenljivega magnetnega polja in/ali toka. Prispevek magnetnega polja k izmeničnim izgubam je prevladujoč pri običajnih elektromagnetnih konfiguracijah naprav s tuljavami. Za superprevodne žice, ki so izpostavljene transverzalnemu izmeničnemu magnetnemu polju, se pričujoča metoda lahko na splošno uporabi pri merjenjih skupnih izmeničnih izgub v širokem frekvenčnem razponu do komercialne ravni 50/60 Hz pri temperaturi tekočega helija. Za superprevodne žice s finimi vlakni se izmenične izgube, merjenje s pričujočo metodo. lahko ločijo na histerezne izgube na posamičnih vlaknih, izgube v spojkah med vlakni in izgube vrtičnega toka v običajno delujočih delih. V primerih, kjer žice nimajo debelega zunanjega običajno delujočega ovoja, so glavne komponente histerezne izgube in izgube v spojkah, ki jih ugotovimo z ocenjevanjem prejšnjega dela kot ekstrapolirane ravni izmeničnih izgub na cikel do nične frekvence na področju nizke frekvence, kjer so izgube v spojkah na cikel sorazmerne s frekvenco.

General Information

• Status: Published
• Publication Date: 25-Nov-2010
• Withdrawal Date: 30-Sep-2013
• ICS: 17.220 - Electricity. Magnetism. Electrical and magnetic measurements
• Technical Committee: CLC/SR 90 - Superconductivity
• Drafting Committee: IEC/TC 90 - IEC_TC_90
• Parallel Committee: IEC/TC 90 - IEC_TC_90
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 26-Nov-2010
• Completion Date: 26-Nov-2010
• Ref Project: SIST EN 61788-8:2011 - Superconductivity - Part 8: AC loss measurements - Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium temperature by a pickup coil method (IEC 61788-8:2010)

Relations

• Replaces: EN 61788-8:2003 - Superconductivity - Part 8: AC loss measurements - Total AC loss measurement of Cu/Nb-Ti composite superconducting wires exposed to a transverse alternating magnetic field by a pickup coil method
• Effective Date: 29-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2011
1DGRPHãþD
SIST EN 61788-8:2003
6XSHUSUHYRGQRVWGHO0HULWYHL]PHQLþQLKL]JXE0HULWYHVNXSQLKL]PHQLþQLK
L]JXERNURJOLKVXSHUSUHYRGQLKåLFNLVRL]SRVWDYOMHQHWUDQVYHU]DOQHPX
L]PHQLþQHPXPDJQHWQHPXSROMXSULWHPSHUDWXULWHNRþHJDKHOLMD]RGMHPQRWXOMDYR
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Superconductivity - Part 8: AC loss measurements - Total AC loss measurement of
round superconducting wires exposed to a transverse alternating magnetic field at liquid
helium temperature by a pickup coil method (IEC 61788-8:2010)
Supraleitfähigkeit - Teil 8: Messung der Wechselstromverluste - Messung der
Gesamtwechselstromverluste von runden Supraleiterdrähten in transversalen
magnetischen Wechselfeldern mit Hilfe eines Pickupspulenverfahrens bei der
Temperatur von flüssigem Helium (IEC 61788-8:2010)
Supraconductivité - Partie 8: Mesure des pertes en courant alternatif - Mesure de la
perte totale en courant alternatif des fils supraconducteurs ronds exposés à un champ
magnétique alternatif transverse par une méthode par bobines de détection (CEI 61788-
8:2010)
Ta slovenski standard je istoveten z: EN 61788-8:2010
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 61788-8
NORME EUROPÉENNE
November 2010
EUROPÄISCHE NORM
ICS 17.220 Supersedes EN 61788-8:2003

English version
Superconductivity -
Part 8: AC loss measurements -
Total AC loss measurement of round superconducting wires exposed to a
transverse alternating magnetic field at liquid helium temperature by a
pickup coil method
(IEC 61788-8:2010)
Supraconductivité -  Supraleitfähigkeit -
Partie 8: Mesure des pertes en courant Teil 8: Messung der
alternatif - Wechselstromverluste -
Mesure de la perte totale en courant Messung der
alternatif des fils supraconducteurs ronds Gesamtwechselstromverluste von runden
exposés à un champ magnétique alternatif Supraleiterdrähten in transversalen
transverse par une méthode par bobines magnetischen Wechselfeldern mit Hilfe
de détection eines Pickupspulenverfahrens bei der
(CEI 61788-8:2010) Temperatur von flüssigem Helium
(IEC 61788-8:2010)
This European Standard was approved by CENELEC on 2010-10-01. 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, Croatia, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61788-8:2010 E
Foreword
The text of document 90/243/FDIS, future edition 2 of IEC 61788-8, prepared by IEC TC 90,
Superconductivity, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 61788-8 on 2010-10-01.
This European Standard supersedes EN 61788-8:2003.
The main changes with respect to the previous edition are listed below:
– extending the applications of the pickup coil method to the a.c. loss measurements in metallic and
oxide superconducting wires with a round cross section at liquid helium temperature;
– u1 in accordance with the decision at the June 2006 IEC/TC90 meeting in Kyoto.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
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) 2011-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61788-8:2010 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
[2] IEC 61788-13:2003 NOTE  Harmonized as EN 61788-13:2003 (not modified).
[3] IEC 61788-1:2006 NOTE  Harmonized as EN 61788-1:2007 (not modified).
[9] IEC 61788-2 NOTE  Harmonized as EN 61788-2.
__________
- 3 - EN 61788-8:2010
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
IEC 61788-8 ®
Edition 2.0 2010-06
INTERNATIONAL
STANDARD
Superconductivity –
Part 8: AC loss measurements – Total AC loss measurement of round
superconducting wires exposed to a transverse alternating magnetic field
at liquid helium temperature by a pickup coil method

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
V
ICS 17.220 ISBN 978-2-88912-007-9
– 2 – 61788-8 © IEC:2010(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope.7
2 Normative references .7
3 Terms and definitions .7
4 Principle .9
5 Apparatus.10
5.1 Testing apparatus .10
5.2 Pickup coils .10
5.3 Compensation circuit.10
6 Specimen preparation.11
6.1 Coiled specimen.11
6.1.1 Winding of specimen .11
6.1.2 Configuration of coiled specimen .11
6.1.3 Maximum bending strain.11
6.1.4 Treatment of terminal cross section of specimen .11
6.2 Specimen coil form.11
7 Testing conditions .11
7.1 External applied magnetic field.11
7.1.1 Amplitude of applied field .11
7.1.2 Direction of applied field .11
7.1.3 Waveform of applied field .12
7.1.4 Frequency of applied field .12
7.1.5 Uniformity of applied field .12
7.2 Setting of the specimen.12
7.3 Measurement temperature.12
7.4 Test procedure .12
7.4.1 Compensation .12
7.4.2 Measurement of background loss .12
7.4.3 Loss measurement .13
7.4.4 Calibration.13
8 Calculation of results .13
8.1 Amplitude of applied magnetic field .13
8.2 Magnetization.13
8.3 Magnetization curve .14
8.4 AC loss .14
8.5 Hysteresis loss.14
8.6 Coupling loss and coupling time constant [5,6] .14
9 Uncertainty.14
9.1 General .14
9.2 Uncertainty of measurement apparatus .15
9.3 Uncertainty of applied field .15
9.4 Uncertainty of measurement temperature .15
10 Test report.15
10.1 Identification of specimen.15

61788-8 © IEC:2010(E) – 3 –
10.2 Configuration of coiled specimen.15
10.3 Testing conditions .16
10.4 Results.16
10.5 Measurement apparatus .16
10.5.1 Pickup coils .16
10.5.2 Measurement system.17
Annex A (informative) Additional information relating to Clauses 1 to 10 .19
Annex B (informative) Explanation of AC loss measurement with Poynting’s vector [10] .21
Annex C (informative) Estimation of geometrical error in the pickup coil method .22
Annex D (informative) Recommended method for calibration of magnetization and AC
loss.23
Annex E (informative)  Coupling loss for various types of applied magnetic field.25
Annex F (informative) Uncertainty considerations .26
Annex G (informative) Evaluation of uncertainty in AC loss measurement by pickup coil
method [13] .31
Bibliography.34

Figure 1 – Standard arrangement of the specimen and pickup coils .17
Figure 2 – A typical electrical circuit for AC loss measurement by pickup coils.18
Figure C.1 − Examples of c
...