1、 IEC 61788-13 Edition 2.0 2012-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 13: AC loss measurements Magnetometer methods for hysteresis loss in superconducting multifilamentary composites Supraconductivit Partie 13: Mesure des pertes en courant alternatif Mthodes de mesure
2、par magntomtre des pertes par hystrsis dans les composites multifilamentaires supraconducteurs IEC61788-13:2012 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2012 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized i
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16、u si vous avez des questions contactez-nous: csciec.ch. IEC 61788-13 Edition 2.0 2012-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 13: AC loss measurements Magnetometer methods for hysteresis loss in superconducting multifilamentary composites Supraconductivit Partie 13: Mes
17、ure des pertes en courant alternatif Mthodes de mesure par magntomtre des pertes par hystrsis dans les composites multifilamentaires supraconducteurs INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE T ICS 17.220, 29.050 PRICE CODE CODE PRIX ISBN 978-2-83220-292-0
18、Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un dis
19、tributeur agr. 2 61788-13 IEC:2012 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 General specifications 8 4.1 Target uncertainty . 8 4.2 Uncertainty and uniformity of the applied field . 8 4.3 VSM calibration . 8 4.4 Temperature 9 4.5 Spe
20、cimen length 9 4.6 Specimen orientation and demagnetization effects 9 4.7 Normalization volume 9 4.8 Mode of field cycling or sweeping 9 5 The VSM method of measurement 10 5.1 General . 10 5.2 VSM measurement principle 10 5.3 VSM specimen preparation 10 5.4 VSM measurement conditions and calibration
21、 . 12 5.4.1 Field amplitude 12 5.4.2 Direction of applied field 12 5.4.3 Rate of change of the applied field (sweep rate) 12 5.4.4 Waveform of the field change 12 5.4.5 Specimen size and shape correction 12 5.4.6 Allowance for addendum (background subtraction) 13 5.4.7 Data point density 13 6 Test r
22、eport 13 6.1 General . 13 6.2 Initiation of the test 13 6.3 Technical details . 13 Annex A (informative) The SQUID method of measurement . 15 Annex B (normative) Extension of the standard to the measurement of superconductors in general . 16 Annex C (informative) Uncertainty considerations 18 Biblio
23、graphy 23 Figure 1 A typical experimental setup of VSM measurement 11 Figure 2 Three alternative specimen configurations for the VSM measurement 11 Table C.1 Output signals from two nominally identical extensometers 19 Table C.2 Mean values of two output signals . 19 Table C.3 Experimental standard
24、deviations of two output signals . 19 Table C.4 Standard uncertainties of two output signals 20 Table C.5 Coefficient of variations of two output signals 20 61788-13 IEC:2012 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY Part 13: AC loss measurements Magnetometer methods for hyster
25、esis loss in superconducting multifilamentary composites FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-ope
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34、luding legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application o
35、f this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61788-13 has been prepared by IEC technical
36、committee 90: Superconductivity. This second edition cancels and replaces the first edition published in 2003. It constitutes a technical revision. Modifications made to the second edition are to extend to the measurement of superconductors in general, in various sample sizes and shapes, and at temp
37、eratures other than 4,2 K, to use the word “uncertainty” for all quantitative (associated with a number) statistical expressions and eliminate the quantitative use of “precision” and “accuracy” in accordance with the decision at the June 2006 IEC/TC90 meeting in Kyoto. 4 61788-13 IEC:2012 The text o
38、f this standard is based on the following documents: FDIS Report on voting 90/302/FDIS 90/306/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 Direc
39、tives, Part 2. A list of all parts of the IEC 61788 series, 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 stability date indicated on the IEC web site under “http:/webstore.
40、iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61788-13 IEC:2012 5 INTRODUCTION IEC Technical Committee 90 proposes magnetometer and pickup coil methods for measuring the AC losses of C
41、u/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
42、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 los
43、s measurement in higher frequency (or sweep rate) magnetic fields. The frequency range is 0 Hz 0,06 Hz for the magnetometer method and 0,005 Hz 60 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 deals with
44、the magnetometer method. 6 61788-13 IEC:2012 SUPERCONDUCTIVITY Part 13: AC loss measurements Magnetometer methods for hysteresis loss in superconducting multifilamentary composites 1 Scope This part of IEC 61788 describes considerations for the measurement of hysteretic loss in Cu/Nb-Ti multifilamen
45、tary composites using DC- or low-ramp-rate magnetometry. This international standard specifies a method of the measurement of hysteretic loss in multifilamentary Cu/Nb-Ti composite conductors. Measurements are assumed to be on round wires with temperatures at or near 4,2 K. DC or low-ramp-rate magne
46、tometry will be performed using either a superconducting quantum interference device (SQUID magnetometer, See Annex A.) or a vibrating-sample magnetometer (VSM). In case differences between the calibrated magnetometer results are noted, the VSM results, extrapolated to zero ramp rate, will be taken
47、as definitive. Extension to the measurement of superconductors in general is given in Annex B. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited appl
48、ies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050 (all parts), International Electrotechnical Vocabulary (available at 5 Lp. 4.6 Specimen orientation and demagnetization effects Loss measurements shall be made on strand specimens
49、 in a transverse magnetic field. For the fully penetrated fine filaments of a multifilamentary Cu/Nb-Ti strand, demagnetization is negligible. By the same token, it is negligible for round-, flat-, or square-cross-sectioned bundles of such strands. However, for the sake of completeness in reporting the results, the specimen configuration shall be reported. 4.7 Normalization volume It may be desirable to report h
