1、BSI Standards PublicationElectrical measuring transducers for converting A.C. and D.C. electrical quantities to analogue or digital signalsBS EN 60688:2013BS EN 60688:2013Incorporating corrigendum December 2013BS EN 60688:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implemen
2、tation of EN 60688:2013. It is identical to IEC 60688:2012, incorporating corrigendum December 2013. It supersedes BS EN 60688:1992 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PEL/85, Measuring equipment for electrical and electromagnetic quantitie
3、s.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Sta
4、ndards Limited 2014ISBN 978 0 580 85439 2ICS 17.220.20Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2013.Amendments/corrigenda issued since publica
5、tionDate Text affected30 April 2014 Implementation of IEC corrigendum December 2013: F-33 in Table 7 amendedEUROPEAN STANDARD EN 60688 NORME EUROPENNE EUROPISCHE NORM January 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisc
6、hes Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60688:2013 E ICS 17.220.20 Supersedes EN 60688:1992 + A1:1999 + A2:2001 English v
7、ersion Electrical measuring transducers for converting A.C. and D.C. electrical quantities to analogue or digital signals (IEC 60688:2012) Transducteurs lectriques de mesure convertissant les grandeurs lectriques alternatives ou continues en signaux analogiques ou numriques (CEI 60688:2012) Elektris
8、che Messumformer zur Umwandlung von elektrischen Wechselstromgren und Gleichstromgren in analoge oder digitale Signale (IEC 60688:2012) This European Standard was approved by CENELEC on 2012-11-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the cond
9、itions 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 CEN-CENELEC Management Centre or to any CENELEC member. This European Standard e
10、xists 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the n
11、ational electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
12、Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 60688:2013EN 60688:2013 - 2 - Foreword The text of document 85/421/FDIS, future edition 3 of IEC 60688, prepared by IEC/TC 85 “Measuring equipment for electrical and electromagnetic quantities“ wa
13、s submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60688:2013. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-08-23 latest date by which the
14、 national standards conflicting with the document have to be withdrawn (dow) 2015-11-23 This document supersedes EN 60688:1992 + A1:1999 + A2:2001. EN 60688:2013 includes the following significant technical changes with respect to EN 60688:1992 + A1:1999 + A2:2001: - extending the scope to DC quanti
15、ties; - extending the scope to harmonics, total harmonic distortion and apparent power; - adaptation of the requirements for digital transducers; - updating normative references; - updating safety requirements with the EN 61010 series; - updating EMC requirements with EN 61326-1. Attention is drawn
16、to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed fo
17、r Use within Certain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60688:2012 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
18、indicated: IEC 60044-7 NOTE Harmonised as EN 60044-7. IEC 60044-8 NOTE Harmonised as EN 60044-8. IEC 60051 Series NOTE Harmonised as EN 60051 Series (not modified). IEC 60068-2-30 NOTE Harmonised as EN 60068-2-30. IEC 60359 NOTE Harmonised as EN 60359. IEC 60770-1 NOTE Harmonised as EN 60770-1. IEC
19、60770-2 NOTE Harmonised as EN 60770-2. IEC 60770-3 NOTE Harmonised as EN 60770-3. BS EN 60688:2013EN 60688:2013 - 2 - Foreword The text of document 85/421/FDIS, future edition 3 of IEC 60688, prepared by IEC/TC 85 “Measuring equipment for electrical and electromagnetic quantities“ was submitted to t
20、he IEC-CENELEC parallel vote and approved by CENELEC as EN 60688:2013. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-08-23 latest date by which the national standa
21、rds conflicting with the document have to be withdrawn (dow) 2015-11-23 This document supersedes EN 60688:1992 + A1:1999 + A2:2001. EN 60688:2013 includes the following significant technical changes with respect to EN 60688:1992 + A1:1999 + A2:2001: - extending the scope to DC quantities; - extendin
22、g the scope to harmonics, total harmonic distortion and apparent power; - adaptation of the requirements for digital transducers; - updating normative references; - updating safety requirements with the EN 61010 series; - updating EMC requirements with EN 61326-1. Attention is drawn to the possibili
23、ty that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Cer
24、tain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60688:2012 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: IEC 6
25、0044-7 NOTE Harmonised as EN 60044-7. IEC 60044-8 NOTE Harmonised as EN 60044-8. IEC 60051 Series NOTE Harmonised as EN 60051 Series (not modified). IEC 60068-2-30 NOTE Harmonised as EN 60068-2-30. IEC 60359 NOTE Harmonised as EN 60359. IEC 60770-1 NOTE Harmonised as EN 60770-1. IEC 60770-2 NOTE Har
26、monised as EN 60770-2. IEC 60770-3 NOTE Harmonised as EN 60770-3. BS EN 60688:2013- 3 - EN 60688:2013 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in thi
27、s document and are indispensable for its application. 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, indi
28、cated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60051-1 1997 Direct acting indicating analogue electrical measuring instruments and their accessories - Part 1: Definitions and general requirements common to all parts EN 60051-1 1998 IEC 60068-2-6 - Environmental tes
29、ting - Part 2-6: Tests - Test Fc: Vibration (sinusoidal) EN 60068-2-6 - IEC 60068-2-27 - Environmental testing - Part 2-27: Tests - Test Ea and guidance: Shock EN 60068-2-27 - IEC 60255-151 - Measuring relays and protection equipment - Part 151: Functional requirements for over/under current protect
30、ion EN 60255-151 - IEC 61010 Series Safety requirements for electrical equipment for measurement, control, and laboratory use EN 61010 Series IEC 61010-1 - Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements EN 61010-1 - IEC 61010-2
31、-030 - Safety requirements for electrical equipment for measurement, control and laboratory use - Part 2-030: Particular requirements for testing and measuring circuits EN 61010-2-030 - IEC 61326 Series Electrical equipment for measurement, control and laboratory use - EMC requirements EN 61326 Seri
32、es IEC 61326-1 - Electrical equipment for measurement, control and laboratory use - EMC requirements - Part 1: General requirements EN 61326-1 - IEC 61557-12 - Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring o
33、f protective measures - Part 12: Performance measuring and monitoring devices (PMD) EN 61557-12 - IEC 60417-DB Graphical symbols for use on equipment - - BS EN 60688:2013 2 60688 IEC:2012 CONTENTS INTRODUCTION . 6 1 Scope . 7 2 Normative references . 8 3 Terms and definitions . 8 General terms . 8 3
34、.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 index . 14 3.
35、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 4.5Auxilia
36、ry 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 over-range
37、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 auxiliary supply
38、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 factor . 29 6.8V
39、ariation due to output load . 30 6.9BS EN 60688:2013 2 60688 IEC:2012 CONTENTS INTRODUCTION . 6 1 Scope . 7 2 Normative references . 8 3 Terms and definitions . 8 General terms . 8 3.1Description of transducers according to the measurand . 11 3.2Description of transducers according to their output l
40、oad . 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 index . 14 3.84 Class index, permissible limits of intrinsic error, auxiliary supply and reference conditions . 15 Transducer gener
41、al 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 4.5Auxiliary supply . 18 4.6Safety requirements: Clearances and creepage distances . 19 4.75 Requirements . 19 Input values . 19
42、 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 over-range of the measurand . 23 5.7Limiting value of the output signal . 23 5.8Limiting conditions of operation . 23 5.9Limits o
43、f 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 auxiliary supply voltage 25 6.2Variations due to auxiliary supply frequency 26 6.3Variations due to ambient temperature 27 6.4Variation
44、s 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 factor . 29 6.8Variation due to output load . 30 6.9BS EN 60688:201360688 IEC:2012 3 Variations due to distortion of the input quantit
45、y(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 6.13Variation due to self-heating 33 6.14Variation due to continuous operation 33 6.15Variation due to common mode inte
46、rference 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 disturbance test 36 6.20Test for temperature rise . 36 6.21Other tests 36 6.227 Marking and information . 36 Marking on
47、 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 in a separate document 38 7.4Bibliography 40 Figure 1 Transducer architecture . 15 Figure 2 Transfer function curv
48、es . 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 conditions of the influence quantities and tolerances or testing purposes . 17 Table 4 Reference conditions rela
49、tive 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 transducers 38 BS EN 60688:2013 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 complex than conventional analogue transducers and gives them considerable added value. The class index system of classifi
