EN IEC 60688:2024

Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals

IEC 60688:2024 applies to transducers (TRD) with electrical inputs and outputs for making measurements of AC or DC electrical quantities. The output signal can be in the form of an analogue or digital signal. This document applies to measuring transducers used for converting electrical quantities such as: – current, – voltage, – active power, – reactive power, – power factor, – phase angle, – frequency, – harmonics or total harmonic distortion, – apparent power, and – DC power to an output signal. This document applies a) if the fundamental frequency of the input(s) lies between 0 Hz and 1 500 Hz, b) to the electrical measuring transducer if it is part of a system for the measurement of an electrical or non-electrical quantity, c) to transducers for use in a variety of applications such as telemetry and process control and in one of a number of defined environments. This document is not applicable for: – instrument transformers that comply with IEC 61869 (all parts), – transmitters for use in an industrial process application that comply with IEC 60770 (all parts), – power metering and monitoring devices (PMD) that comply with IEC 61557-12, – meters that comply with the IEC 62053 series, – handheld sensors, – residual current monitoring devices (RCMs) that comply with IEC 62020-1, – residual current detecting devices (RDC-DD) that comply with IEC 62955, – in-cable control and protection devices (IC-CPDs) that comply with IEC 62752, – modular residual current devices (MRCDs) that comply with IEC 60947 2:2016/AMD1:2019, Annex M. Within the measuring range, the output signal is a function of the measurand. An auxiliary supply can be required. This document is intended: – to specify the terminology and definitions relating to transducers whose main application is in industry, – to unify the test methods used in evaluating transducer performance, – to specify accuracy limits and output values for transducers. IEC 60688:2024 cancels and replaces the fourth edition published in 2021. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) updating normative references; b) updating definitions; c) updating structure; d) adding DC power measurement.

Elektrische Messumformer zur Umwandlung von elektrischen Wechselstromgrößen und Gleichstromgrößen in analoge oder digitale Signale

Transducteurs électriques de mesure convertissant les grandeurs électriques alternatives ou continues en signaux analogiques ou numériques

L'IEC 60688:2024 s’applique aux transducteurs (TRD) à grandeurs d’entrées et de sorties électriques destinés à mesurer des grandeurs électriques alternatives ou continues. Le signal de sortie peut être sous la forme d’un signal analogique ou numérique. Le présent document s’applique aux transducteurs de mesure destinés à convertir des grandeurs électriques, telles que: – le courant; – la tension; – la puissance active; – la puissance réactive; – le facteur de puissance; – le déphasage; – la fréquence; – les harmoniques ou la distorsion harmonique totale; – la puissance apparente; et – la puissance en courant continu, en signal de sortie. Le présent document s’applique: a) si la fréquence fondamentale de la ou des grandeurs d’entrée est comprise entre 0 Hz et 1 500 Hz; b) à un transducteur de mesure électrique appartenant à une chaîne de mesure d’une grandeur électrique ou non électrique; c) aux transducteurs destinés à une utilisation générale, par exemple à la télémesure, à la commande de processus et dans un des nombreux environnements spécifiés. Le présent document ne s’applique pas: – aux transformateurs de mesure conformes à la série IEC 61869; – aux transmetteurs utilisés dans un processus industriel conforme à la série IEC 60770; – aux dispositifs de comptage et de surveillance du réseau électrique (PMD) conformes à l’IEC 61557-12; – aux compteurs conformes à la série IEC 62053; – aux capteurs portatifs; – aux contrôleurs d’isolement à courant différentiel résiduel (RCM) conformes à l’IEC 62020-1; – aux dispositifs de détection de courant résiduel (RDC-DD) conformes à la série IEC 62955; – aux dispositifs de contrôle et de protection intégrés au câble (IC-CPD) conformes à la série IEC 62752; – aux dispositifs modulaires à courant résiduel (MRCD) conformes à l’IEC 60947-2:2016/AMD1:2019, Annexe M. Dans l’étendue de mesure, le signal de sortie varie en fonction du mesurande. Une alimentation auxiliaire peut être exigée. Le présent document a pour objet: – de spécifier la terminologie et les définitions relatives aux transducteurs dont l’application principale relève du domaine de l’industrie; – d’unifier les méthodes d’essai utilisées pour évaluer les performances des transducteurs; – de spécifier les limites de précision et les valeurs de sortie des transducteurs. L'IEC 60688:2024 annule et remplace la quatrième édition parue en 2021. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente: a) mise à jour des références normatives; b) mise à jour des définitions; c) mise à jour de la structure; d) ajout du mesurage de la puissance en courant continu.

Električni merilni pretvorniki za pretvarjanje izmeničnih električnih veličin v analogne ali digitalne signale

General Information

• Status: Published
• Publication Date: 19-Dec-2024
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: CLC/TC 85X - Measuring equipment for electrical and electromagnetic quantities
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 20-Dec-2024
• Completion Date: 20-Dec-2024
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: oSIST prEN IEC 60688:2023 - Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals

Relations

• Replaces: EN 60688:2013 - Electrical measuring transducers for converting A.C. and D.C. electrical quantities to analogue or digital signals
• Effective Date: 17-Oct-2023
• Revises: prEN IEC 60688:2021 - Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals
• Effective Date: 13-Feb-2024

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2023
Električni merilni pretvorniki za pretvarjanje izmeničnih električnih veličin v
analogne ali digitalne signale
Electrical measuring transducers for converting AC and DC electrical quantities to
analogue or digital signals
Ta slovenski standard je istoveten z: prEN IEC 60688:2023
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

85/892/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60688 ED5
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2023-09-29 2023-12-22
SUPERSEDES DOCUMENTS:
85/888/RR
IEC TC 85 : MEASURING EQUIPMENT FOR ELECTRICAL AND ELECTROMAGNETIC QUANTITIES
SECRETARIAT: SECRETARY:
China Ms Guiju HAN
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 13, SC 23K, TC 38, TC 66
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clauses to
be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC clauses.
(See AC/22/2007 or NEW GUIDANCE DOC).

TITLE:
Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital
signals
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

85/892/CDV – 2 – IEC CDV 60688 © IEC 2023
CONTENTS
FOREWORD . 9
INTRODUCTION . 11
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 14
3.1 General terms . 14
3.2 Terms describing transducers . 15
3.3 Terms describing transducers according to the measurand . 17
3.4 Terms describing transducers according to their output load . 18
3.5 Nominal values . 18
3.6 Terms describing transducers with provisions to be adjusted by users . 19
3.7 Influence quantities and reference conditions. 20
3.8 Errors and variations . 20
3.9 Accuracy, accuracy class, class index. 21
3.10 Terms related to primary of transducers . 21
3.11 Terms related to secondary output of transducers . 22
4 Environmental conditions . 22
5 Ratings . 22
6 Requirements for design and construction . 22
6.1 General . 22
6.1.1 Transducer general architecture . 22
6.1.2 Classification of transducers (TRD) . 23
6.2 Safety requirements . 23
6.2.1 General . 23
6.2.2 Protection against electric shocks . 24
6.2.3 Protection against mechanical hazards . 25
6.2.4 Resistance to mechanical stress . 25
6.2.5 Protection against the spread of fire . 25
6.2.6 Equipment temperature limits and resistance to heat . 25
6.2.7 Protection against hazards from fluids . 26
6.2.8 Protection against radiation, including laser sources, and against sonic
and ultrasonic pressure . 26
6.2.9 Protection against liberated gases and substances, explosion and
implosion . 26
6.2.10 Components and subassemblies. 26
6.2.11 Protection by interlocks . 26
6.2.12 Hazards resulting from application . 26
6.2.13 Risk assessment . 26
6.3 EMC requirements . 26
6.3.1 General . 26
6.3.2 Immunity requirements . 27
6.3.3 Emission requirements . 28
6.4 Climatic requirements . 29

IEC CDV 60688 © IEC 2023 – 3 – 85/892/CDV
6.5 Mechanical requirements . 29
6.6 Functional requirements . 29
6.7 Marking requirements . 29
6.8 Documentation requirements . 29
7 Type tests . 29
8 Routine tests . 29
Annex A (normative) Requirements for TRD1 . 30
A.1 Scope . 30
A.2 Normative references . 30
A.3 Terms and definitions . 30
A.4 Environmental conditions . 30
A.5 Ratings . 30
A.6 Requirements for design and construction of TRD1 . 31
A.6.1 General . 31
A.6.2 Safety requirements . 31
A.6.3 EMC requirements . 31
A.6.4 Climatic requirements . 31
A.6.5 Mechanical requirements . 31
A.6.6 Functional requirements . 31
A.6.7 Marking requirements . 39
A.6.8 Documentation requirements . 41
A.7 Type tests for TRD1 . 42
A.7.1 General . 42
A.7.2 General additional requirements for type tests for TRD1 . 42
A.7.3 Variations due to auxiliary supply voltage . 42
A.7.4 Variations due to auxiliary supply frequency . 43
A.7.5 Variations due to ambient temperature . 44
A.7.6 Variations due to the frequency of the input quantity(ies) . 45
A.7.7 Variations due to the input voltage . 45
A.7.8 Variations due to the input current . 46
A.7.9 Variations due to power factor . 47
A.7.10 Variation due to output load . 48
A.7.11 Variations due to distortion of the input quantity(ies). 48
A.7.12 Variation due to magnetic field of external origin. 49
A.7.13 Variation due to unbalanced currents . 50
A.7.14 Variation due to interaction between measuring elements . 50
A.7.15 Variation due to self-heating . 51
A.7.16 Variation due to continuous operation . 52
A.7.17 Variation due to common mode interference . 52
A.7.18 Variation due to series mode interference . 53
A.7.19 Permissible excessive inputs . 53
A.7.20 Impulse voltage tests . 54
A.7.21 High frequency disturbance test . 54
A.7.22 Test for temperature rise . 54
A.7.23 Other tests . 54
Annex B (normative) Requirements for TRD2 . 55

85/892/CDV – 4 – IEC CDV 60688 © IEC 2023
B.1 Scope . 55
B.2 Normative references . 55
B.3 Terms and definitions . 55
B.4 Environmental conditions . 55
B.4.1 General . 55
B.4.2 Normal environmental conditions . 55
B.5 Ratings for TRD2 . 56
B.5.1 General . 56
B.5.2 Input ratings . 56
B.5.3 Output ratings . 58
B.5.4 General ratings . 59
B.6 Requirements for design and construction of TRD2 .
...