oSIST prEN IEC 60688:2021
(Main)Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals
Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals
IEC 60688:2021 is available as IEC 60688:2021 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60688:2021 applies to transducers 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 direct current, an analog direct voltage or in digital form.
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, and
– apparent power
to an output signal.
This document is not applicable for
– instrument transformers that complies with IEC 61869 (all parts),
– transmitters for use in industrial process application that complies with IEC 60770 (all parts), and
– performance measuring and monitoring devices (PMD) that comply with IEC 61557 12:2018.
Within the measuring range, the output signal is a function of the measurand. An auxiliary supply can be needed.
This document applies
a) if the nominal 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 a non-electrical quantity, and if it otherwise falls within the scope of this document, and
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 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, and
– to specify accuracy limits and output values for transducers.
IEC 60688:2021 cancels and replaces the third edition published in 2012. 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) additional requirements for specific transducers used for LV monitoring applications;
c) creation of interface coding to ease selection by the end-user.
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
IEC 60688:2021 est disponible sous forme de IEC 60688:2021 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
L'IEC 60688:2021 s'applique aux transducteurs 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 courant continu analogique ou d’une tension continue analogique ou d’un signal 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,
– l’angle de phase,
– la fréquence,
– les harmoniques ou la distorsion harmonique totale, et
– la puissance apparente
en signal de sortie.
Le présent document ne s’applique pas:
– aux transformateurs de mesure conformes à la série IEC 61869,
– aux transmetteurs utilisés dans le processus industriel conformes à la série IEC 60770, et
– aux dispositifs de mesure et de surveillance des performances (PMD – performance measuring and monitoring device) conformes à l’IEC 61557-12:2018.
Dans l’étendue de mesure, le signal de sortie varie en fonction du mesurande. Une alimentation auxiliaire peut être nécessaire.
Le présent document s'applique:
a) si la fréquence nominale 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 non électrique, et si, par ailleurs, celui-ci relève du domaine d'application du présent document, et
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 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, et
– de spécifier les limites de précision et les valeurs de sortie des transducteurs.
L'IEC 60688:2021 annule et remplace la troisième édition parue en 2012. 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) exigences supplémentaires pour les transducteurs spécifiques utilisés pour les applications de surveillance de la BT (basse tension)
c) création d'un codage d'interface pour faciliter la sélection par l'utilisateur final.
Električni merilni pretvorniki za pretvarjanje izmeničnih in enosmernih električnih veličin v analogne ali digitalne signale
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60688:2021
01-april-2021
Električni merilni pretvorniki za pretvarjanje izmeničnih in enosmernih električnih
veličin v analogne ali digitalne signale
Electrical measuring transducers for converting AC and DC electrical quantities to
analogue or digital signals
Transducteurs électriques de mesure convertissant les grandeurs électriques
alternatives ou continues en signaux analogiques ou numériques
Ta slovenski standard je istoveten z: prEN IEC 60688:2021
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
oSIST prEN IEC 60688:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 60688:2021
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oSIST prEN IEC 60688:2021
85/748/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60688 ED4
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-01-29 2021-04-23
SUPERSEDES DOCUMENTS:
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.
TITLE:
Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital
signals
PROPOSED STABILITY DATE: 2023
NOTE FROM TC/SC OFFICERS:
Copyright © 2020 International Electrotechnical Commission, IEC . All rights reserved. It is permitted to download this
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.
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1 CONTENTS
2
3 FOREWORD . - 7 -
4 INTRODUCTION . - 9 -
5 1 Scope . - 10 -
6 2 Normative references . - 11 -
7 3 Terms and definitions . - 11 -
8 3.1 General terms . - 11 -
9 3.2 Description of transducers according to the measurand . - 14 -
10 3.3 Description of transducers according to their output load . - 15 -
11 3.4 Nominal values . - 15 -
12 3.5 User adjustment . - 16 -
13 3.6 Influence quantities and reference conditions . - 17 -
14 3.7 Errors and variations . - 17 -
15 3.8 Accuracy, accuracy class, class index . - 18 -
16 4 General . - 18 -
17 4.1 Transducer general architecture . - 18 -
18 4.2 Classification of transducers (TRD) . - 19 -
19 5 Requirements for TRD1 . - 19 -
20 5.1 Safety requirements: Clearances and creepage distances . - 19 -
21 5.2 EMC requirements . - 19 -
22 5.2.1 Immunity . - 19 -
23 5.2.2 Emission . - 19 -
24 5.3 Class index requirements . - 19 -
25 5.3.1 Class index . - 19 -
26 5.3.2 Class index for transducer used with sensors . - 20 -
27 5.3.3 Intrinsic error . - 20 -
28 5.4 Conditions for the determination of intrinsic error . - 20 -
29 5.5 Auxiliary supply . - 21 -
30 5.5.1 General . - 21 -
31 5.5.2 DC supply . - 21 -
32 5.5.3 AC supply . - 22 -
33 5.6 Input values . - 22 -
34 5.7 Analogue output signals . - 22 -
35 5.7.1 General . - 22 -
36 5.7.2 Output current . - 22 -
37 5.7.3 Compliance voltage . - 22 -
38 5.7.4 Maximum output voltage . - 22 -
39 5.7.5 Interference risk of output current . - 23 -
40 5.7.6 Output voltage . - 23 -
41 5.8 Output transfer function . - 23 -
42 5.9 Digital output signals . - 25 -
43 5.10 Ripple (for analogue outputs) . - 25 -
44 5.11 Response time . - 26 -
45 5.12 Variation due to over-range of the measurand. - 26 -
46 5.13 Limiting value of the output signal . - 26 -
47 5.14 Limiting conditions of operation . - 26 -
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48 5.15 Limits of the measuring range . - 26 -
49 5.16 Limiting conditions for storage and transport . - 26 -
50 5.17 Sealing . - 26 -
51 5.18 Stability . - 27 -
52 6 Tests for TRD1 . - 27 -
53 6.1 General . - 27 -
54 6.1.1 Determination of variations . - 27 -
55 6.1.2 Environmental conditions . - 27 -
56 6.1.3 Computations . - 27 -
57 6.2 Variations due to auxiliary supply voltage . - 28 -
58 6.2.1 Application. - 28 -
59 6.2.2 Procedure . - 28 -
60 6.2.3 Computation . - 28 -
61 6.2.4 Permissible variations . - 28 -
62 6.3 Variations due to auxiliary supply frequency . - 28 -
63 6.3.1 Application. - 28 -
64 6.3.2 Procedure . - 28 -
65 6.3.3 Computation . - 29 -
66 6.3.4 Permissible variations . - 29 -
67 6.4 Variations due to ambient temperature . - 29 -
68 6.4.1 Application. - 29 -
69 6.4.2 Procedure . - 29 -
70 6.4.3 Computation . - 29 -
71 6.4.4 Permissible variations . - 29 -
72 6.5 Variations due to the frequency of the input quantity(ies) . - 29 -
73 6.5.1 Application. - 29 -
74 6.5.2 Procedure . - 29 -
75 6.5.3 Computation . - 30 -
76 6.5.4 Permissible variations . - 30 -
77 6.6 Variations due to the input voltage . - 30 -
78 6.6.1 Application. - 30 -
79 6.6.2 Procedure . - 30 -
80 6.6.3 Computation . - 30 -
81 6.6.4 Permissible variations . - 30 -
82 6.7 Variations due to the input current . - 30 -
83 6.7.1 Application. - 30 -
84 6.7.2 Procedure . - 30 -
85 6.7.3 Computation . - 31 -
86 6.7.4 Permissible variations . - 31 -
87 6.8 Variations due to power factor . - 31 -
88 6.8.1 Application. - 31 -
89 6.8.2 Procedure . - 31 -
90 6.8.3 Computation . - 31 -
91 6.8.4 Permissible variations . - 31 -
92 6.9 Variation due to output load . - 32 -
93 6.9.1 Application. - 32 -
94 6.9.2 Procedure . - 32 -
95 6.9.3 Computation . - 32 -
96 6.9.4 Permissible variations . - 32 -
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97 6.10 Variations due to distortion of the input quantity(ies) . - 32 -
98 6.10.1 Application. - 32 -
99 6.10.2 Procedure . - 32 -
100 6.10.3 Computation . - 32 -
101 6.10.4 Permissible variations . - 33 -
102 6.11 Variation due to magnetic field of external origin . - 33 -
103 6.11.1 Application. - 33 -
104 6.11.2 Procedure . - 33 -
105 6.11.3 Computation . - 33 -
106 6.11.4 Permissible variations . - 33 -
107 6.12 Variation due to unbalanced currents . - 33 -
108 6.12.1 Application. - 33 -
109 6.12.2 Procedure . - 33 -
110 6.12.3 Computation . - 34 -
111 6.12.4 Permissible variations . - 34 -
112 6.13 Variation due to interaction between measuring elements . - 34 -
113 6.13.1 Application. - 34 -
114 6.13.2 Procedure . - 34 -
115 6.13.3 Computation . - 34 -
116 6.13.4 Permissible variations . - 34 -
117 6.14 Variation due to self-heating . - 34 -
118 6.14.1 Application. - 34 -
119 6.14.2 Method . - 34 -
120 6.14.3 Computation . - 34 -
121 6.14.4 Permissible variations . - 35 -
122 6.15 Variation due to continuous operation . - 35 -
123 6.15.1 Application. - 35 -
124 6.15.2 Procedure . - 35 -
125 6.15.3 Computation . - 35 -
126 6.15.4 Permissible variation . - 35 -
127 6.16 Variation due to common mode interference . - 35 -
128 6.16.1 Application. - 35 -
129 6.16.2 Procedure . - 35 -
130 6.16.3 Computation . - 35 -
131 6.16.4 Permissible variations . - 35 -
132 6.17 Variation due to series mode interference . - 35 -
133 6.17.1 Application. - 35 -
134 6.17.2 Procedure . - 35 -
135 6.17.3 Computation . - 36 -
136 6.17.4 Permissible variations . - 36 -
137 6.17.5 Permissible excessive inputs . - 36 -
138 6.17.6 Continuous excessive inputs. - 36 -
139 6.17.7 Excessive inputs of short duration . - 36 -
140 6.18 Voltage test, insulation tests and other safety requirements . - 36 -
141 6.19 Impulse voltage tests . - 36 -
142 6.20 High frequency disturbance test . - 37 -
143 6.21 Test for temperature rise . - 37 -
144 6.22 Other tests . - 37 -
145 7 Marking and information for TRD1 . - 37 -
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146 7.1 Marking on the case . - 37 -
147 7.2 Markings relating to the reference conditions and nominal ranges of use for
148 transducers . - 38 -
149 7.3 Identification of connections and terminals . - 38 -
150 7.4 Information to be given in a separate document . - 39 -
151 Annex A (normative) Requirements for TRD2 . - 40 -
152 Annex B (normative) Interface coding . - 64 -
153 Annex C (Informative) Anti-aliasing requirements. - 71 -
154 Annex D (informative) Requirements for the measurement of harmonics and low
155 frequencies. - 73 -
156 Annex E (normative) Markings terminals of TRD2 . - 75 -
157 Annex F (informative) Guidance related to cables, busbars and bare conductors within
158 an installation . - 77 -
159 Annex G (informative) Guidance related to Overvoltage Categories and Measurement
160 Categories . - 78 -
161 Bibliography . - 81 -
162
163 Figure 1 – Transducer (TRD) architecture . - 19 -
164 Figure 2 – Transfer function curve A . - 23 -
165 Figure 3 – Transfer function curve B . - 24 -
166 Figure 4 – Transfer function curve C . - 24 -
167 Figure 5 – Transfer function curve D . - 24 -
168 Figure 6 – Transfer function curve E . - 25 -
169 Figure A.1 – Relationship between ambient air temperature and relative humidity . - 44 -
170 Figure A.2 – Accuracy limits of a TRD2-IDC . - 51 -
171 Figure A.3 – Measurement of the step response time . - 57 -
172 Figure A.4 – Temperature cycle accuracy test . - 59 -
173 Figure C.1 – Digital data acquisition system example. - 71 -
174 Figure C.2 – Frequency response mask for metering accuracy class 1 (f = 60 Hz, f =
r s
175 4 800 Hz) . - 72 -
176
177 Table 1 – Functional classification of Transducers with minimal required functions . - 19 -
178 Table 1 – Relationship between the limits of intrinsic error, expressed as a percentage
179 of the fiducial value, and the class index . - 19 -
180 Table 2 – Pre-conditioning . - 20 -
181 Table 3 – Reference conditions of the influence quantities and tolerances or testing
182 purposes . - 20 -
183 Table 4 – Reference conditions relative to the measurand . - 21 -
184 Table 5 – Usage groups . - 27 -
185 Table 6 – Examples of marking relating to the reference conditions and nominal range
186 of use for temperature . - 38 -
187 Table 7 – Symbols for marking transducers . - 39 -
188 Table A.1 – Rated burden for TRD2 with an AC or DC voltage output, or a frequency
189 output . - 42 -
190 Table A.2 – Rated burden for TRD2 with an AC or DC current output. - 42 -
191 Table A.3 – Rated temperatures for TRD2 . - 43 -
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192 Table A.4 – Rated humidity classes . - 43 -
193 Table A.5 – Definition of ports . - 47 -
194 Table A.6 – Performance criteria for EMC immunity tests . - 48 -
195 Table A.7 – RJ45 connector pinout . - 49 -
196 Table A.8 – Limits for error and phase error for TRD2-IAC . - 49 -
197 Table A.9 – Limits of ratio error for TRD2-IDC . - 50 -
198 Table A.10 – Limits of ratio error for TRD2-UAC . - 51 -
199 Table A.11 – Limits of ratio error for TRD2-UDC . - 52 -
200 Table A.12 – Burden values for basic accuracy tests . - 55 -
201 Table B.1 – Coding of interface connection . - 64 -
202 Table B.2 –Rated AC RMS voltage output . - 65 -
203 Table B.3 –Rated DC voltage output . - 65 -
204 Table B.4 – Rated range of DC voltage output . - 65 -
205 Table B.5 –Rated AC RMS current output less than 1A . - 65 -
206 Table B.6 –Rated range of DC current output . - 66 -
207 Table B.7 – Rated frequency output . - 66 -
208 Table B.8 – Rated pulse density output . - 66 -
209 Table B.9 – Coding of power supply for transducers supplied from measuring
210 instrument via the connector . - 67 -
211 Table B.10 – Coding of external power supply for transducers . - 67 -
212 Table B.11 – Coding of transfer function curves for transducers . - 67 -
213 Table B.12 – Interface full coding for output of transducers . - 67 -
214 Table B.13 – Examples of interface codes and most common interface codes . - 68 -
215 Table C.1 – Anti-aliasing filter . - 71 -
216 Table D.1 – Limits of error for harmonics - Accuracy classes . - 73 -
217 Table D.2 – Limits of error for harmonics - Accuracy class extensions WB1 and WB2 . - 74 -
218 Table E.1 – Marking of terminals for TRD2 monitoring current . - 75 -
219 Table E.2 – Marking of terminals for TRD2 monitoring voltage . - 76 -
220
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221 INTERNATIONAL ELECTROTECHNICAL COMMISSION
222 ____________
223
224 ELECTRICAL MEASURING TRANSDUCERS FOR CONVERTING AC AND DC
225 ELECTRICAL QUANTITIES TO ANALOGUE OR DIGITAL SIGNALS
226
227 FOREWORD
228 1) The International Electrotechnical Commission (IEC) is a
...
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