IEC 62057-1:2023

IEC 62057-1
®

Edition 1.0 2023-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Electrical energy meters – Test equipment, techniques and procedures –
Part 1: Stationary meter test units (MTUs)

Compteurs d'énergie électrique – Équipements, techniques et procédures
d'essai –
Partie 1: Bancs d'essai stationnaires des compteurs d'énergie électrique (MTU)

IEC 62057-1:2023-03(en-fr)

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IEC 62057-1

®


Edition 1.0 2023-03




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Electrical energy meters – Test equipment, techniques and procedures –

Part 1: Stationary meter test units (MTUs)



Compteurs d'énergie électrique – Équipements, techniques et procédures

d'essai –

Partie 1: Bancs d'essai stationnaires des compteurs d'énergie électrique (MTU)















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 17.220.20; 91.140.50 ISBN 978-2-8322-6437-9



Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – IEC 62057-1:2023 © IEC 2023
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
3.1 Definitions related to the elements of the MTU . 11
3.2 Definitions of active, reactive and apparent power . 12
3.3 Definitions related to influence quantities . 15
3.4 Definitions related to accuracy . 16
3.5 Definitions related to testing. 17
4 Meter test units and automated meter test units. 18
5 Meter accuracy test methods . 19
5.1 General . 19
5.2 Energy comparison method . 19
5.3 Power–time measurement method (wattmeter method with register reading) . 20
5.4 Pulse comparison method . 20
6 Standard electrical values. 21
6.1 Mains supply . 21
6.2 Output values and ranges of the test circuits . 22
6.2.1 Test voltage circuit . 22
6.2.2 Test current circuit . 22
6.2.3 Phase angle . 23
6.2.4 Frequency . 23
6.2.5 Harmonics . 24
6.3 Standard meter . 24
6.3.1 Accuracy class . 24
6.3.2 Standard electrical values . 24
6.4 Magnetic field of the MTU . 25
6.5 Electrical and mechanical values for the scanning head(s) . 25
6.6 Error calculation system . 26
6.6.1 Functional requirements . 26
6.6.2 Parameters . 26
7 Constructional requirements of the MTU . 26
7.1 General requirements . 26
7.2 Source and standard meter . 26
7.3 Meter mounting system . 27
7.3.1 General . 27
7.3.2 Terminals . 27
8 Information and marking requirements . 28
8.1 General . 28
8.2 Labels, signs and signals . 29
8.3 Information for selection . 30
8.3.1 General . 30
8.3.2 General information . 30
8.3.3 Information related to standard meters . 30
8.3.4 Information related to sources, error calculation systems and frequency
generators . 31

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IEC 62057-1:2023 © IEC 2023 – 3 –
8.3.5 Information related to the ICTs and MSVTs . 31
8.3.6 For the communication interfaces and error calculation systems . 31
8.4 Information for installation and commissioning . 32
8.4.1 General . 32
8.4.2 Dimensions and mass . 32
8.4.3 Connection . 32
8.4.4 Protection – Protective class and earthing . 32
8.4.5 Self-consumption . 33
8.5 Information for use . 33
8.5.1 General . 33
8.5.2 Display, push buttons and other controls . 33
8.5.3 Connection to user’s equipment . 33
8.5.4 External protection devices . 33
8.5.5 Cleaning . 33
8.5.6 Information for maintenance . 33
9 Climatic conditions for the MTU . 34
9.1 Normal environmental conditions . 34
9.2 Extreme environmental conditions. 34
9.3 Temperature limits and resistance to heat . 34
10 Electrical requirements of the MTU . 35
10.1 Influence of mains supply. 35
10.2 Insulation . 35
10.2.1 General . 35
10.2.2 Clearances and creepage distances . 35
10.2.3 Verification of clearances and creepage distances . 35
10.2.4 AC voltage test . 35
11 Electromagnetic compatibility . 36
11.1 General requirements and performance criteria . 36
11.2 General test conditions . 37
11.2.1 General . 37
11.2.2 Test of immunity to electrostatic discharges. 37
11.2.3 Test of immunity of electromagnetic RF Fields . 37
11.2.4 Immunity to power frequency magnetic fields of external origin . 38
11.2.5 Test of immunity to fast transient bursts . 38
11.2.6 Test of immunity to surges . 38
11.2.7 Test of immunity to conducted disturbances, induced by RF (radio
frequency) fields . 38
11.2.8 Radio interference suppression . 39
12 Standard meter . 39
12.1 General . 39
12.2 Accuracy requirements under reference conditions . 39
12.3 Limits of error due to influence quantities . 40
12.4 Accuracy tests in the presence of harmonics . 42
th
12.4.1 Test with 5 harmonic in the current and voltage . 42
12.4.2 Tests of the influence of odd and sub-harmonics . 42
13 Software requirements . 42
13.1 Application . 42
13.2 Identification . 42

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– 4 – IEC 62057-1:2023 © IEC 2023
13.3 Protection . 42
13.4 Functional requirements . 43
13.5 Control and supervision of the MTU by the software . 43
13.6 Creation, protection and storage of test programs . 44
13.7 Protection and storage of test results and test protocols . 44
13.8 Documentation of the software . 44
13.9 Software logs . 44
14 Accuracy requirements and tests . 45
14.1 General . 45
14.2 Test methods for determination of the MTU accuracy . 45
14.3 Test points – Selection of voltage and current ranges . 46
14.4 Accuracy requirements . 47
14.4.1 Limits of maximum permissible error . 47
14.4.2 Correction of the error δW of the MTU . 47
14.4.3 Mean value and repeatability of the measurements . 48
14.5 Check of measurement results of the MTU . 49
14.5.1 Basic measurements of the MTU . 49
14.5.2 Maintenance measurement of the MTU . 49
14.6 Tests and testing procedures . 49
14.6.1 Type tests . 49
14.6.2 Routine tests . 49
14.6.3 Acceptance test . 51
14.6.4 Commissioning test . 51
Annex A (informative) Symbols according to IEC 60417 . 52
Annex B (normative) Reference conditions . 53
Annex C (informative) Test circuits and test signals for testing in the presence of
harmonics . 54
C.1 General . 54
C.2 Phase fired control (odd harmonics) . 54
C.3 Burst control (sub-harmonics) . 56
Annex D (informative) Calculation of errors and the associated expanded
measurement uncertainty . 58
D.1 General . 58
D.2 Degrees of freedom and sensitivity coefficient . 58
D.3 Method for the determination of the standard measurement uncertainty . 59
D.3.1 Type A . 59
D.3.2 Type B . 60
D.4 Examples for the calculation of the measurement uncertainty . 61
D.4.1 Measuring principle . 61
D.4.2 Model equation . 61
D.4.3 Measurement uncertainty budget considering the specification for the
working standard . 62
D.4.4 Measurement uncertainty budget considering the error of the working

standard . 65
D.5 Indication of the measurement uncertainty . 67
Annex E (informative) Guidelines for overall laboratory setup . 68
E.1 General . 68
E.2 General conditions . 68
E.3 Quality of mains supply . 68

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IEC 62057-1:2023 © IEC 2023 – 5 –
E.4 Reference standard . 69
Annex F (normative) Multi-secondary voltage transformer . 70
F.1 General . 70
F.2 Definitions. 70
F.3 Application . 70
F.4 Technical requirements . 71
F.5 Total accuracy of MTU with MSVT . 72
Annex G (normative) Isolating current transformer (ICT) . 73
G.1 General . 73
G.2 Definitions. 73
G.3 Application . 73
G.4 Technical requirements . 74
G.5 Wiring and terminals . 74
G.6 Total accuracy of MTU with ICT . 74
Bibliography . 76

Figure C.1 – Test circuit diagram (informative) . 54
Figure C.2 – Phase fired waveform . 55
Figure C.3 – Informative distribution of harmonic content of phase fired waveform (the
Fourier analysis is not complete) . 55
Figure C.4 – Burst fired waveform . 56
Figure C.5 – Informative distribution of harmonics (the Fourier analysis is not
complete) . 57
Figure D.1 – Measuring setup of the meter test arrangement . 61
Figure F.1 – Testing of single-phase meters with closed link between the voltage and
current circuits (variant 1) . 71
Figure F.2 – Testing of single-phase meters with closed link between the voltage and
current circuits (variant 2) . 71
Figure G.1 – Testing of three-phase meters with closed link between the voltage and

current circuits . 73


Table 1 – Mains power supply condition . 22
Table 2 – Test voltage circuit for each phase . 22
Table 3 – Test current circuit for each phase . 23
Table 4 – Setting of phase angle between each phase voltage and current circuit . 23
Table 5 – Setting of frequency . 23
Table 6 – Setting of harmonics. 24
Table 7 – Standard electrical values for the standard meter . 25
Table 8 – Electrical and mechanical values for the scanning head(s) . 25
Table 9 – Parameters for the error calculation system. 26
Table 10 – Information requirements . 28
Table 11 – Climatic conditions . 34
Table 12 – Surface temperature limits . 34
Table 13 – AC voltage tests . 36
Table 14 – Limits of variation of error of standard meters during immunity test . 37
Table 15 – Relative error limits for the standard meter . 40

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– 6 – IEC 62057-1:2023 © IEC 2023
Table 16 – Influence quantities . 41
Table 17 – Recommended accuracy class of reference standard meter . 46
Table 18 – Basic measurement table (recommended test points) . 46
Table 19 – Limits of maximum permissible error (δW ) of the complete MTU related
max
to DUT . 47
Table 20 – Limits of permissible values of standard deviation of MTU . 48
Table A.1 – Symbols which may be used on metering equipment . 52
Table B.1 – Reference conditions . 53
Table D.1 – Coverage factors k for different effective degrees of freedom V . 59
eff
Table D.2 – List 1 of quantities . 63
Table D.3 – Readings 1 of the DUT . 63
Table D.4 – Reading 1 of the standard meter . 64
Table D.5 – Measurement uncertainty budget 1 .
...