IEC 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 li.pdf

1、 IEC 61788-8 Edition 2.0 2010-06 INTERNATIONAL STANDARD NORME INTERNATIONALE 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 Supraconductivi

2、t Partie 8 : Mesure des pertes en courant alternatif Mesure de la perte totale en courant alternatif des fils supraconducteurs ronds exposs un champ magntique alternatif transverse par une mthode par bobines de dtection IEC 61788-8:2010-06(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 201

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20、publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61788-8 Edition 2.0 2010-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Superconductivity Part 8: AC loss measurements Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field

21、at liquid helium temperature by a pickup coil method Supraconductivit Partie 8 : Mesure des pertes en courant alternatif Mesure de la perte totale en courant alternatif des fils supraconducteurs ronds exposs un champ magntique alternatif transverse par une mthode par bobines de dtection INTERNATIONA

22、L ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE V ICS 17.220 PRICE CODE CODE PRIX ISBN 978-2-8322-1467-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained t

23、his publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 IEC 61788-8:2010 IEC 2010 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitions . 7 4 Principle . 9 5 App

24、aratus . 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 specime

25、n . 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 spe

26、cimen . 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

27、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 spe

28、cimen 15 10.2 Configuration of coiled specimen . 15 IEC 61788-8:2010 IEC 2010 3 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 (info

29、rmative) Explanation of AC loss measurement with Poyntings 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

30、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

31、for AC loss measurement by pickup coils 18 Figure C.1 Examples of calculated contour line map of the coefficient G 22 Figure D.1 Evaluation of critical field from magnetization curves 24 Figure E.1 Waveforms of applied magnetic field with a period T = 1/f . 25 Table F.1 Output signals from two nomin

32、ally identical extensometers 27 Table F.2 Mean values of two output signals 27 Table F.3 Experimental standard deviations of two output signals 27 Table F.4 Standard uncertainties of two output signals 28 Table F.5 Coefficient of variations of two output signals . 28 Table G.1 Propagation of relativ

33、e uncertainty in the pickup coil method ( = 0,5) . 33 4 IEC 61788-8:2010 IEC 2010 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ SUPERCONDUCTIVITY Part 8: AC loss measurements Total AC loss measurement of round superconducting wires exposed to a transverse alternating magnetic field at liquid helium te

34、mperature by a pickup coil method 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-operation on all questions

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43、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 of this publication. 9)

44、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 61788-8 has been prepared by IEC technical committee 90: Supercondu

45、ctivity. This bilingual version (2014-03) corresponds to the monolingual English version, published in 2010-06. 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 liste

46、d 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. IEC 61788-8:2010 IEC 2010 5

47、The text of this standard is based on the following documents: FDIS Report on voting 90/243/FDIS 90/249/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. The French version of this standard has not been voted upon.

48、 This publication has been drafted in accordance with the ISO/IEC Directives, 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

49、the stability 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 will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 IEC 61788-8:2010 IEC 2010 INTRODUCTION Magnetometer and pickup coil methods are proposed for measuring the AC losses of composite superconducting wires in tran