EN 61788-8:2003
(Main)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
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
Specifies the measurement method of total AC losses by the pickup coil method in Cu/Nb-Ti composite superconducting wires exposed to a transverse alternating magnetic field. The losses may contain both hysteresis and coupling losses. The standard method to measure only the hysteresis loss in DC or low-sweep-rate magnetic field is specified in EN 61788-13.
Supraleitfähigkeit - Teil 8: Messung der Wechselstromverluste - Messung der gesamten Wechselstromverluste von Cu/NbTi-Verbundsupraleiterdrähten in transversalen magnetischen Wechselfeldern mit Hilfe eines Pickupspulen-Verfahrens
Supraconductivité - Partie 8: Mesure des pertes en courant alternatif - Méthode de mesure par bobines de détection des pertes totales en courant alternatif des fils composites supraconducteurs de Cu/Nb-Ti exposés à un champ magnétique alternatif transverse
Spécifie la méthode de mesure par bobines de détection des pertes totales en courant alternatif des fils supraconducteurs de Cu/Nb-Ti exposés à un champ magnétique alternatif transverse. Les pertes peuvent être à la fois des pertes par hystérésis et des pertes par couplage. 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 EN 61788-13.
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
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Standards Content (Sample)
SLOVENSKI SIST EN 61788-8:2003
STANDARD
oktober 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
ICS 17.220.20; 29.050 Referenčna številka
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
EUROPEAN STANDARD EN 61788-8
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2003
ICS 17.220; 29.050
English version
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
(IEC 61788-8:2003)
Supraconductivité Supraleitfähigkeit
Partie 8: Mesure des pertes Teil 8: Messung der
en courant alternatif - Wechselstromverluste -
Méthode de mesure par bobines Messung der gesamten
de détection des pertes totales Wechselstromverluste von
en courant alternatif des fils composites Cu/NbTi-Verbundsupraleiterdrähten
supraconducteurs de Cu/Nb-Ti in transversalen magnetischen
exposés à un champ magnétique Wechselfeldern mit Hilfe eines
alternatif transverse Pickupspulen-Verfahrens
(CEI 61788-8:2003) (IEC 61788-8:2003)
This European Standard was approved by CENELEC on 2003-05-01. 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 61788-8:2003 E
Foreword
The text of document 90/135A/FDIS, future edition 1 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 2003-05-01.
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) 2004-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn dow) 2006-05-01
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 annexes A to E are informative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61788-8:2003 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - «Field32»
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
1)
IEC 60050-815 - International Electrotechnical - -
Vocabulary (IEV)
Chapter 815: Superconductivity
1)
Undated reference.
NORME CEI
INTERNATIONALE IEC
61788-8
INTERNATIONAL
Première édition
STANDARD
First edition
2003-04
Supraconductivité –
Partie 8:
Mesure des pertes en courant alternatif –
Méthode de mesure par bobines de détection
des pertes totales en courant alternatif des fils
composites supraconducteurs de Cu/Nb-Ti
exposés à un champ magnétique alternatif
transverse
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
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Pour prix, voir catalogue en vigueur
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61788-8 © IEC:2003 – 3 –
CONTENTS
FOREWORD . 5
INTRODUCTION .7
1 Scope . 9
2 Normative references. 9
3 Terms and definitions . 9
4 Principle .13
5 Apparatus .15
6 Specimen preparation.17
7 Testing conditions.17
8 Calculation of results .21
9 Precision and accuracy.25
10 Test report.25
Annex A (informative) Explanation of AC loss measurement with Poynting’s vector .31
Annex B (informative) Estimation of geometrical error in the pickup coil method .33
Annex C (informative) Recommended method for calibration of magnetization and
AC loss .35
Annex D (informative) Coupling loss for various types of applied magnetic field .39
Annex E (informative) Extension to three-component superconducting wires.41
Bibliography.43
Figure 1 – Standard arrangement of the specimen and pickup coils .29
Figure 2 – A typical electrical circuit for AC loss measurement by pickup coils .29
Figure B.1 − Examples of calculated contour line map of the coefficient G for a
radius R of the coiled specimen and a difference a between radii of the specimen and
each pickup coil .33
Figure C.1 − Evaluation of critical field from magnetization curves .37
Figure D.1 – Waveforms of applied magnetic field with a period T.39
61788-8 © IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
__________
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
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 61788-8 has been prepared by IEC technical committee 90:
Superconductivity.
The text of this standard is based on the following documents:
FDIS Report on voting
90/135A/FDIS 90/140/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 2008. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
61788-8 © IEC:2003 – 7 –
INTRODUCTION
Magnetometer and pickup coil methods are proposed for measuring the AC losses of Cu/Nb-
Ti composite superconducting wires in transverse time-varying magnetic fields. These
represent initial steps in standardization of methods for measuring the various contributions to
AC loss in transverse fields, the most frequently encountered configuration.
It was decided to split the initial proposal mentioned above, into two documents covering two
standard methods. One of them describes the magnetometer method for hysteresis loss and
low frequency (or sweep rate) total AC loss measurement in a slowly varying magnetic field,
and the other describes the pickup coil method for total AC loss measurement in higher
frequency (or sweep rate) magnetic fields. The frequency range is 0 Hz to 0,06 Hz for the
magnetometer method and 0,005 Hz to 1 Hz for the pickup coil method. The overlap between
0,005 Hz and 0,06 Hz is a complementary frequency range for the two methods.
This standard covers the pickup coil method. The test method for standardization of AC loss
covered in this standard is partly based on the Versailles Project on Advanced Materials and
Standards (VAMAS) pre-standardization work on the AC loss of NbTi composite super-
conductors [1] .
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Figures in square brackets refer to the Bibliography.
61788-8 © IEC:2003 – 9 –
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
1 Scope
This part of IEC 61788-8 specifies the measurement method of total AC losses by the pickup
coil method in Cu/Nb-Ti composite superconducting wires exposed to a transverse alternating
magnetic field. The losses may contain both hysteresis and coupling losses. The standard
method to measure only the hysteresis loss in DC or low-sweep-rate magnetic field is
specified in IEC 61788-13 [2].
The specimen shall be a multifilamentary round or rectangular wire, expected to be mainly
used for pulsed coil applications with relatively higher frequencies o
...
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