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eLibrary > BS EN IEC 60688:2024 Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals >

BS EN IEC 60688:2024 Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals, 2024

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Annex ZA (normative)Normative references to international publicationswith their corresponding European publications [Go to Page]
English [Go to Page]
CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 General terms
3.2 Terms describing transducers
3.3 Terms describing transducers according to the measurand
3.4 Terms describing transducers according to their output load
3.5 Nominal values
3.6 Terms describing transducers with provisions to be adjusted by users
3.7 Influence quantities and reference conditions
3.8 Errors and variations
3.9 Accuracy, accuracy class, class index
3.10 Terms related to primary of transducers
3.11 Terms related to secondary output of transducers
4 Environmental conditions
5 Ratings
6 Requirements for design and construction [Go to Page]
6.1 General [Go to Page]
6.1.1 Transducer general architecture
6.1.2 Classification of transducers (TRD)
Figures [Go to Page]
Figure 1 – Transducer (TRD) architecture example
Tables [Go to Page]
Table 1 – Functional classification of transducers with minimal required functions
6.2 Safety requirements [Go to Page]
6.2.1 General
6.2.2 Protection against electric shocks
6.2.3 Protection against mechanical hazards
6.2.4 Resistance to mechanical stress
6.2.5 Protection against the spread of fire
6.2.6 Equipment temperature limits and resistance to heat
6.2.7 Protection against hazards from fluids
6.2.8 Protection against radiation, including laser sources, and against sonic and ultrasonic pressure
6.2.9 Protection against liberated gases and substances, explosion and implosion
6.2.10 Components and subassemblies
6.2.11 Protection by interlocks
6.2.12 Hazards resulting from application
6.2.13 Risk assessment
6.3 EMC requirements [Go to Page]
6.3.1 General
6.3.2 Immunity requirements
Table 2 – Definition of ports [Go to Page]
6.3.3 Emission requirements
6.4 Climatic requirements
6.5 Mechanical requirements
6.6 Functional requirements
6.7 Marking requirements
6.8 Documentation requirements
Table 3 – Performance criteria for EMC immunity tests
7 Type tests
8 Routine tests
Annexes [Go to Page]
Annex A (normative) Requirements for TRD1 [Go to Page]
A.1 General
A.2 References for the purposes of this Annex A
A.3 Terminology for the purposes of this Annex A
A.4 Environmental conditions
A.5 Ratings
Table A.1 – Usage groups [Go to Page]
A.6 Requirements for design and construction of TRD1 [Go to Page]
A.6.1 General
A.6.2 Safety requirements
A.6.3 EMC requirements
A.6.4 Climatic requirements
A.6.5 Mechanical requirements
A.6.6 Functional requirements
Table A.2 – Relationship between the limits of intrinsic error, expressed as a percentage of the fiducial value, and the class index
Table A.3 – Pre-conditioning
Table A.4 – Reference conditions of the influence quantities and tolerances for testing purposes
Table A.5 – Reference conditions relative to the measurand
Figure A.1 – Transfer function curve A
Figure A.2 – Transfer function curve B
Figure A.3 – Transfer function curve C
Figure A.4 – Transfer function curve D
Figure A.5 – Transfer function curve E [Go to Page]
[Go to Page]
A.6.7 Marking requirements
Table A.6 – Examples of marking relating to the reference conditions and nominal range of use for temperature
Table A.7 – Symbols for marking transducers [Go to Page]
[Go to Page]
A.6.8 Documentation requirements
A.7 Type tests for TRD1 [Go to Page]
A.7.1 General
A.7.2 General additional requirements for type tests for TRD1
A.7.3 Variations due to auxiliary supply voltage
Table A.8 – Permissible variations due to AC auxiliary supply [Go to Page]
[Go to Page]
A.7.4 Variations due to auxiliary supply frequency
A.7.5 Variations due to ambient temperature
Table A.9 – Permissible variations due to DC auxiliary supply
Table A.10 – Permissible variations due to auxiliary supply frequency [Go to Page]
[Go to Page]
A.7.6 Variations due to the frequency of the input quantity(ies)
Table A.11 – Permissible variations due to ambient temperature [Go to Page]
[Go to Page]
A.7.7 Variations due to the input voltage
A.7.8 Variations due to the input current
Table A.12 – Permissible variations due to the frequency of input quantity
Table A.13 – Permissible variations due to the input voltage [Go to Page]
[Go to Page]
A.7.9 Variations due to power factor
Table A.14 – Permissible variations due to the input current [Go to Page]
[Go to Page]
A.7.10 Variation due to output load
Table A.15 – Permissible variations due to power factor [Go to Page]
[Go to Page]
A.7.11 Variations due to distortion of the input quantity(ies)
A.7.12 Variation due to magnetic field of external origin
Table A.16 – Permissible variations due to output load
Table A.17 – Permissible variations due to distortion of input quantities [Go to Page]
[Go to Page]
A.7.13 Variation due to unbalanced currents
Table A.18 – Permissible variations due to magnetic field of external origin [Go to Page]
[Go to Page]
A.7.14 Variation due to interaction between measuring elements
Table A.19 – Permissible variations due to unbalance currents
Table A.20 – Permissible variations due to interactions between measuring elements [Go to Page]
[Go to Page]
A.7.15 Variation due to self-heating
A.7.16 Variation due to continuous operation
Table A.21 – Permissible variations due to self-heating [Go to Page]
[Go to Page]
A.7.17 Variation due to common mode interference
A.7.18 Variation due to series mode interference
Table A.22 – Permissible variations due to continuous operation [Go to Page]
[Go to Page]
A.7.19 Permissible excessive inputs
A.7.20 Impulse voltage tests
Table A.23 – Permissible variations due to series mode interference [Go to Page]
[Go to Page]
A.7.21 High frequency disturbance test
A.7.22 Test for temperature rise
A.7.23 Other tests
Annex B (normative) Requirements for TRD2 [Go to Page]
B.1 General
B.2 References for the purposes of this Annex B
B.3 Terminology for the purposes of this Annex B
B.4 Environmental conditions [Go to Page]
B.4.1 General
B.4.2 Normal environmental conditions
Table B.1 – Environmental conditions parameters [Go to Page]
B.5 Ratings for TRD2 [Go to Page]
B.5.1 General
B.5.2 Input ratings
B.5.3 Output ratings
B.5.4 General ratings
Table B.2 – Preferred rated burden for TRD2 with an AC or DC voltage output, or a frequency output
Table B.3 – Rated burden for TRD2 with an AC or DC current output
Table B.4 – Rated temperatures for TRD2
Table B.5 – Rated humidity classes [Go to Page]
B.6 Requirements for design and construction of TRD2 [Go to Page]
B.6.1 General
B.6.2 Safety requirements
B.6.3 EMC requirements
B.6.4 Climatic requirements
Figure B.1 – Relationship between ambient air temperature and relative humidity [Go to Page]
[Go to Page]
B.6.5 Mechanical requirements
Figure B.2 – Dimensions
Table B.6 – Examples of terminal lugs for equipment connected to copper conductors
Table B.7 – Nominal cross-sections of round copper conductors and approximate relationship between mm2 and AWG/kcmil sizes
Table B.8 – Minimum values for maximum cross section of conductors upto 400 A inclusive [Go to Page]
[Go to Page]
B.6.6 Functional requirements
Table B.9 – Minimum values for maximum cross section of conductors from 400 A and up to 800 A inclusive
Table B.10 – Minimum values for maximum cross section for copper bars for currents above 400 A and up to 3 150 A inclusive
Table B.11 – Limits for relative error and phase error for TRD2-IAC
Table B.12 – Limits of error for TRD2-IDC
Figure B.3 – Accuracy limits of a TRD2-IAC (a) and TRD2-IDC (b)
Table B.13 – Limits of relative error for TRD2-UAC
Table B.14 – Limits of relative error for TRD2-UDC
Figure B.4 – Definition of the angle between primary conductor and the equipment
Table B.15 – Limits for the position of the primary conductor with respect to the equipment
Figure B.5 – Definition of the primary conductor position according to the position factor [Go to Page]
[Go to Page]
B.6.7 Marking requirements
Table B.16 – RJ45 connector pinout [Go to Page]
[Go to Page]
B.6.8 Documentation requirements
B.7 Type tests of TRD2 [Go to Page]
B.7.1 General
B.7.2 Safety tests
B.7.3 EMC tests
B.7.4 Climatic tests
Table B.17 – Temperature tests [Go to Page]
[Go to Page]
B.7.5 Mechanical tests
Table B.18 – Tightening torques for the verification of the mechanical strength of screw-type terminals
Table B.19 – Maximum conductor cross-sections and corresponding gauges
Table B.20 – Relationship between conductor cross-section and diameter
Figure B.6 – Gauges of form A and form B
Table B.21 – Test values for flexion and pull-out tests for round copper conductors
Figure B.7 – Test equipment for flexion test
Table B.22 – Test values for pull-out test for flat copper conductors
Table B.23 – Test copper conductors for test currents up to 400 A inclusive
Table B.24 – Test copper conductors for test currents above 400 A and up to 800 A inclusive
Table B.25 – Test copper bars for test currents above 400 A and up to 3 150 A inclusive [Go to Page]
[Go to Page]
B.7.6 Functional tests
Table B.26 – Burden values for basic accuracy tests
Figure B.8 – Measurement of the step response time
Figure B.9 – Temperature cycle accuracy test
Figure B.10 – Test set up for impact of magnetic field from other phases – a) First step – b) Second step [Go to Page]
[Go to Page]
B.7.7 Verification of markings and documentation
B.7.8 Short-time currents tests
Figure B.11 – Accuracy measurement test set up [Go to Page]
[Go to Page]
B.7.9 Inter-turn overvoltage tests
B.7.10 Anti-aliasing tests
B.7.11 Test with harmonics and at low frequencies
B.8 Routine tests for TRD2 [Go to Page]
B.8.1 General
B.8.2 Accuracy tests
B.8.3 Verification of markings
B.8.4 Safety tests
B.8.5 Inter-turn overvoltage tests
Annex C (normative) Interface coding [Go to Page]
C.1 General
C.2 Characteristics of interface connection
C.3 Coding of rated output values for transducers
Table C.1 – Coding of interface connection
Table C.2 – Rated AC RMS voltage output
Table C.3 – Rated DC voltage output
Table C.4 – Rated range of DC voltage output
Table C.5 – Rated AC RMS current output less than 1A [Go to Page]
C.4 Coding of auxiliary power supply for transducers
Table C.6 – Rated range of DC current output
Table C.7 – Rated frequency output
Table C.8 – Rated pulse density output [Go to Page]
C.5 Coding of transfer function curves for transducers
C.6 Interface full coding for output of transducers [Go to Page]
C.6.1 General
Table C.9 – Coding of power supply for transducers supplied from a measuring instrument via the connector
Table C.10 – Coding of external power supply for transducers
Table C.11 – Coding of transfer function curves for TRD1 [Go to Page]
[Go to Page]
C.6.2 Examples of interface codes and most common interface codes
Table C.12 – Interface full coding for output of transducers
Table C.13 – Examples of interface codes and most common interface codes
Annex D (informative) Anti-aliasing guidance
Figure D.1 – Digital data acquisition system example
Table D.1 – Anti-aliasing filter
Figure D.2 – Frequency response mask for metering accuracy class 1(fr = 60 Hz, fs = 4 800 Hz)
Annex E (normative) Requirements for the measurement of harmonics and low frequencies [Go to Page]
E.1 General
E.2 Requirements for accuracy class extension WBm0
Table E.1 – Limits of error for harmonics – Accuracy class extension WBm0 [Go to Page]
E.3 Requirements for accuracy class extension WBm1
E.4 Requirements for accuracy class extension WBm2
Table E.2 – Limits of errors for harmonics – Accuracy class extension WBm1 [Go to Page]
E.5 Requirements for accuracy class extension WBm3
Table E.3 – Limits of errors for harmonics – Accuracy class extension WBm2
Table E.4 – Limits of errors for supra-harmonics – Accuracy class extension WBm3
Annex F (normative) Markings of terminals of TRD2 [Go to Page]
F.1 Marking of terminals for TRD2 monitoring AC current
F.2 Marking of terminals for TRD2 monitoring voltage
Table F.1 – Marking of terminals for TRD2 monitoring current
Table F.2 – Marking of terminals for TRD2 monitoring voltage
Annex G (informative) Guidance related to cables, busbars and bare conductors within an installation [Go to Page]
G.1 Insulation of cables
G.2 Temperature of cables and busbars [Go to Page]
G.2.1 Cables
G.2.2 Busbars
Annex H (informative) Guidance related to overvoltage categories and measurement categories [Go to Page]
H.1 Concept of overvoltage category
H.2 Approach of IEC 60664-1 for primary circuits of TRD2 [Go to Page]
H.2.1 General
H.2.2 Examples with IEC 60664-1:2020, for primary measuring circuits, OVC III, PD 2, altitude under 2 000 m, inhomogeneous field
Table H.1 – Clearances according to IEC 60664-1:2020 [Go to Page]
H.3 Approach of IEC 61010 (all parts) for primary circuits of TRD2 [Go to Page]
H.3.1 General
H.3.2 Example with IEC 61010-2-030:2023 for primary measuring circuits, OVC III, PD 2, altitude under 2 000 m, inhomogeneous field
Table H.2 – Creepage distances according to IEC 60664-1:2020 [Go to Page]
H.4 Approach for secondary circuits of TRD2
Table H.3 – Clearances according to IEC 61010-2-030:2017
Table H.4 – Creepage distances according to IEC 61010-2-030:2023
Annex I (informative) Examples of clamping units and relationship between clamping unit and connecting device [Go to Page]
I.1 Clamping unit in a connecting device
I.2 Examples of clamping units
Figure I.1 – Clamping unit in a connecting device
Figure I.2 – Screw clamping units
Figure I.3 – Pillar clamping units
Figure I.4 – Stud clamping units
Figure I.5 – Saddle clamping units
Figure I.6 – Lug clamping units
Figure I.7 – Mantle clamping units
Bibliography [Go to Page]

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