1、 IEC 60688 Edition 3.0 2012-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical measuring transducers for converting A.C. and D.C. electrical quantities to analogue or digital signals Transducteurs lectriques de mesure convertissant les grandeurs lectriques alternatives ou continues en signaux
2、 analogiques ou numriques IEC60688:2012 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 in any form or by any means, electronic or mechanical, including photocop
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16、n 3.0 2012-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical measuring transducers for converting A.C. and D.C. electrical quantities to analogue or digital signals Transducteurs lectriques de mesure convertissant les grandeurs lectriques alternatives ou continues en signaux analogiques ou n
17、umriques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE X ICS 17.220.20 PRICE CODE CODE PRIX ISBN 978-2-83220-435-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make
18、sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 60688 IEC:2012 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 8 3 Terms and definitions . 8 General
19、terms . 8 3.1Description of transducers according to the measurand . 11 3.2Description of transducers according to their output load . 12 3.3Nominal values 12 3.4User adjustment 13 3.5Influence quantities and reference conditions 14 3.6Errors and variations . 14 3.7Accuracy, accuracy class, class in
20、dex . 14 3.84 Class index, permissible limits of intrinsic error, auxiliary supply and reference conditions . 15 Transducer general architecture 15 4.1Class index . 15 4.2Class index for transducer used with sensors 16 4.3Intrinsic error . 16 4.4Conditions for the determination of intrinsic error 16
21、 4.5Auxiliary supply . 18 4.6Safety requirements: Clearances and creepage distances . 19 4.75 Requirements . 19 Input values . 19 5.1Analogue output signals 19 5.2Output transfer function . 20 5.3Digital output signals . 23 5.4Ripple (for analogue outputs) 23 5.5Response time 23 5.6Variation due to
22、over-range of the measurand . 23 5.7Limiting value of the output signal . 23 5.8Limiting conditions of operation . 23 5.9Limits of the measuring range . 24 5.10Limiting conditions for storage and transport . 24 5.11Sealing 24 5.12Stability . 24 5.136 Tests 24 General . 24 6.1Variations due to auxili
23、ary supply voltage 25 6.2Variations due to auxiliary supply frequency 26 6.3Variations due to ambient temperature 27 6.4Variations due to the frequency of the input quantity(ies) 27 6.5Variations due to the input voltage 28 6.6Variations due to the input current . 29 6.7Variations due to power facto
24、r . 29 6.8Variation due to output load . 30 6.960688 IEC:2012 3 Variations due to distortion of the input quantity(ies) . 30 6.10Variation due to magnetic field of external origin . 31 6.11Variation due to unbalanced currents 32 6.12Variation due to interaction between measuring elements . 32 6.13Va
25、riation due to self-heating 33 6.14Variation due to continuous operation 33 6.15Variation due to common mode interference 34 6.16Variation due to series mode interference . 34 6.17Voltage test, insulation tests and other safety requirements 35 6.18Impulse voltage tests . 35 6.19High frequency distur
26、bance test 36 6.20Test for temperature rise . 36 6.21Other tests 36 6.227 Marking and information . 36 Marking on the case 36 7.1Markings relating to the reference conditions and nominal ranges of use for 7.2transducers . 37 Identification of connections and terminals 38 7.3Information to be given i
27、n a separate document 38 7.4Bibliography 40 Figure 1 Transducer architecture . 15 Figure 2 Transfer function curves . 22 Table 1 Relationship between the limits of intrinsic error, expressed as a percentage of the fiducial value, and the class index . 16 Table 2 Pre-conditioning 16 Table 3 Reference
28、 conditions of the influence quantities and tolerances or testing purposes . 17 Table 4 Reference conditions relative to the measurand 18 Table 5 Usage groups 25 Table 6 Examples of marking relating to the reference conditions and nominal range of use for temperature 37 Table 7 Symbols for marking t
29、ransducers 38 4 60688 IEC:2012 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRICAL MEASURING TRANSDUCERS FOR CONVERTING A.C. AND D.C. ELECTRICAL QUANTITIES TO ANALOGUE OR DIGITAL SIGNALS FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardizatio
30、n comprising all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes Internationa
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39、the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of 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 he
40、ld responsible for identifying any or all such patent rights. International Standard 60688 has been prepared by IEC Technical Committee 85: Measuring equipment for electrical and electromagnetic quantities. This third edition cancels and replaces the second edition published in 1992 and its Amendmen
41、t 1 (1997) and Amendment 2 (2001). It constitutes a technical revision This edition includes the following significant technical changes with respect to the previous edition: extending the scope to DC quantities; extending the scope to harmonics, total harmonic distortion and apparent power; adaptat
42、ion of the requirements for digital transducers; updating normative references; updating safety requirements with the IEC 61010 series; updating EMC requirements with IEC 61326-1. 60688 IEC:2012 5 The text of this standard is based on the following documents: FDIS Report on voting 85/421/FDIS 85/436
43、/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. In this standard, the following print types are used: requirements and definit
44、ions: in roman type; NOTES: in smaller roman type; compliance: in italic type. 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.iec.ch“ in the data related to the specific publication. A
45、t this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 60688 IEC:2012 INTRODUCTION New transducers can now be equipped with micro-processors that utilize digital data processing, communication methods and auxiliary sensors. This makes them more comp
46、lex than conventional analogue transducers and gives them considerable added value. The class index system of classification used in this standard is based upon the IEC 60051 series: Direct acting indicating analogue electrical measuring instruments and their accessories. Under this system, the perm
47、itted variations of the output signal due to varying influence quantities ambient temperature, voltage, frequency, etc., are implicit in the clas-sification. For those unfamiliar with the class index system, a word of warning is necessary. If, for example, a transducer is classified as Class 1, it d
48、oes not mean that the error under practical conditions of use will be within 1 % of the actual value of the output or 1 % of the full output value. It means that the error should not exceed 1 % of the fiducial value under closely specified conditions. If the influence quantities are varied between t
49、he limits specified by the nominal ranges of use, a variation of amount comparable with the value of the class index may be incurred for each influence quantity. The permissible error of a transducer under working conditions is the sum of the permissible intrinsic error and of the permissible variations due to each of the influence quantities. However, the actual error is likely to be much smaller because not all of the in
