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BS EN IEC 62057-1:2023

BS EN IEC 62057-1:2023

$215.11

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

Published By Publication Date Number of Pages
BSI 2023 82
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IEC 62057-1:2023 applies to stationary meter test units (MTUs) permanently installed in laboratories, used for testing and calibration of electricity meters, in particular for their type test, acceptance test and verification test. It covers the requirements for automatic MTUs for indoor laboratory application and applies to newly manufactured MTUs to test electricity meters on 50 Hz or 60 Hz networks with an AC voltage up to 600 V (phase to neutral). If meters are intended for system voltages not specified in this document, special requirements are agreed between the manufacturer and the purchaser. This document also defines the kind of tests to perform as type tests / routine tests / acceptance tests and commissioning tests for MTUs. It does not apply to: • portable reference meters and portable sources; • electricity meters; • data interfaces to the meter and test procedures of data interface; • transformer operated MTUs; • personal computers supplied together with the MTU.

PDF Catalog

PDF Pages PDF Title
2 undefined
5 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
7 English
CONTENTS
12 FOREWORD
14 1 Scope
2 Normative references
15 3 Terms and definitions
16 3.1 Definitions related to the elements of the MTU
17 3.2 Definitions of active, reactive and apparent power
20 3.3 Definitions related to influence quantities
21 3.4 Definitions related to accuracy
22 3.5 Definitions related to testing
23 4 Meter test units and automated meter test units
24 5 Meter accuracy test methods
5.1 General
5.2 Energy comparison method
25 5.3 Power–time measurement method (wattmeter method with register reading)
5.4 Pulse comparison method
26 6 Standard electrical values
6.1 Mains supply
27 6.2 Output values and ranges of the test circuits
6.2.1 Test voltage circuit
6.2.2 Test current circuit
Tables
Table 1 – Mains power supply condition
Table 2 – Test voltage circuit for each phase
28 6.2.3 Phase angle
6.2.4 Frequency
Table 3 – Test current circuit for each phase
Table 4 – Setting of phase angle between each phase voltage and current circuit
Table 5 – Setting of frequency
29 6.2.5 Harmonics
6.3 Standard meter
6.3.1 Accuracy class
6.3.2 Standard electrical values
Table 6 – Setting of harmonics
30 6.4 Magnetic field of the MTU
6.5 Electrical and mechanical values for the scanning head(s)
Table 7 – Standard electrical values for the standard meter
Table 8 – Electrical and mechanical values for the scanning head(s)
31 6.6 Error calculation system
6.6.1 Functional requirements
6.6.2 Parameters
7 Constructional requirements of the MTU
7.1 General requirements
7.2 Source and standard meter
Table 9 – Parameters for the error calculation system
32 7.3 Meter mounting system
7.3.1 General
7.3.2 Terminals
33 8 Information and marking requirements
8.1 General
Table 10 – Information requirements
34 8.2 Labels, signs and signals
35 8.3 Information for selection
8.3.1 General
8.3.2 General information
8.3.3 Information related to standard meters
36 8.3.4 Information related to sources, error calculation systems and frequency generators
8.3.5 Information related to the ICTs and MSVTs
8.3.6 For the communication interfaces and error calculation systems
37 8.4 Information for installation and commissioning
8.4.1 General
8.4.2 Dimensions and mass
8.4.3 Connection
8.4.4 Protection – Protective class and earthing
38 8.4.5 Self-consumption
8.5 Information for use
8.5.1 General
8.5.2 Display, push buttons and other controls
8.5.3 Connection to user’s equipment
8.5.4 External protection devices
8.5.5 Cleaning
8.6 Information for maintenance
39 9 Climatic conditions for the MTU
9.1 Normal environmental conditions
9.2 Extreme environmental conditions
9.3 Temperature limits and resistance to heat
Table 11 – Climatic conditions
Table 12 – Surface temperature limits
40 10 Electrical requirements of the MTU
10.1 Influence of mains supply
10.2 Insulation
10.2.1 General
10.2.2 Clearances and creepage distances
10.2.3 Verification of clearances and creepage distances
10.2.4 AC voltage test
41 11 Electromagnetic compatibility
11.1 General requirements and performance criteria
Table 13 – AC voltage tests
42 11.2 General test conditions
11.2.1 General
11.2.2 Test of immunity to electrostatic discharges
11.2.3 Test of immunity of electromagnetic RF Fields
Table 14 – Limits of variation of error of standard meters during immunity test
43 11.2.4 Immunity to power frequency magnetic fields of external origin
11.2.5 Test of immunity to fast transient bursts
11.2.6 Test of immunity to surges
11.2.7 Test of immunity to conducted disturbances, induced by RF (radio frequency) fields
44 11.2.8 Radio interference suppression
12 Standard meter
12.1 General
12.2 Accuracy requirements under reference conditions
45 12.3 Limits of error due to influence quantities
Table 15 – Relative error limits for the standard meter
46 Table 16 – Influence quantities
47 12.4 Accuracy tests in the presence of harmonics
12.4.1 Test with 5th harmonic in the current and voltage
12.4.2 Tests of the influence of odd and sub-harmonics
13 Software requirements
13.1 Application
13.2 Identification
13.3 Protection
48 13.4 Functional requirements
13.5 Control and supervision of the MTU by the software
49 13.6 Creation, protection and storage of test programs
13.7 Protection and storage of test results and test protocols
13.8 Documentation of the software
13.9 Software logs
50 14 Accuracy requirements and tests
14.1 General
14.2 Test methods for determination of the MTU accuracy
51 14.3 Test points – Selection of voltage and current ranges
Table 17 – Recommended accuracy class of reference standard meter
Table 18 – Basic measurement table (recommended test points)
52 14.4 Accuracy requirements
14.4.1 Limits of maximum permissible error
14.4.2 Correction of the error δW of the MTU
Table 19 – Limits of maximum permissible error (δWmax)of the complete MTU related to DUT
53 14.4.3 Mean value and repeatability of the measurements
Table 20 – Limits of permissible values of standard deviation of MTU
54 14.5 Check of measurement results of the MTU
14.5.1 Basic measurements of the MTU
14.5.2 Maintenance measurement of the MTU
14.6 Tests and testing procedures
14.6.1 Type tests
14.6.2 Routine tests
56 14.6.3 Acceptance test
14.6.4 Commissioning test
57 Annexes
Annex A (informative)Symbols according to IEC 60417
Table A.1 – Symbols which may be used on metering equipment
58 Annex B (normative)Reference conditions
Table B.1 – Reference conditions
59 Annex C (informative)Test circuits and test signals for testing in the presence of harmonics
C.1 General
C.2 Phase fired control (odd harmonics)
Figures
Figure C.1 – Test circuit diagram (informative)
60 Figure C.2 – Phase fired waveform
Figure C.3 – Informative distribution of harmonic content of phase fired waveform(the Fourier analysis is not complete)
61 C.3 Burst control (sub-harmonics)
Figure C.4 – Burst fired waveform
62 Figure C.5 – Informative distribution of harmonics (the Fourier analysis is not complete)
63 Annex D (informative)Calculation of errors and the associatedexpanded measurement uncertainty
D.1 General
D.2 Degrees of freedom and sensitivity coefficient
64 D.3 Method for the determination of the standard measurement uncertainty
D.3.1 Type A
Table D.1 – Coverage factors k for different effective degrees of freedom Veff
65 D.3.2 Type B
66 D.4 Examples for the calculation of the measurement uncertainty
D.4.1 Measuring principle
D.4.2 Model equation
Figure D.1 – Measuring setup of the meter test arrangement
67 D.4.3 Measurement uncertainty budget considering the specification for the working standard
68 Table D.2 – List 1 of quantities
Table D.3 – Readings 1 of the DUT
69 Table D.4 – Reading 1 of the standard meter
Table D.5 – Measurement uncertainty budget 1
70 D.4.4 Measurement uncertainty budget considering the error of the working standard
Table D.6 – List 2 of quantities
Table D.7 – Readings 2 of the DUT
71 Table D.8 – Reading 2 of the standard meter
72 D.5 Indication of the measurement uncertainty
Table D.9 – Measurement uncertainty budget 2
73 Annex E (informative)Guidelines for overall laboratory setup
E.1 General
E.2 General conditions
E.3 Quality of mains supply
74 E.4 Reference standard
Table E.1 – Mains supply quality
75 Annex F (normative)Multi-secondary voltage transformer
F.1 General
F.2 Definitions
F.3 Application
76 F.4 Technical requirements
Figure F.1 – Testing of single-phase meters with closed linkbetween the voltage and current circuits (variant 1)
Figure F.2 – Testing of single-phase meters with closed linkbetween the voltage and current circuits (variant 2)
77 F.5 Total accuracy of MTU with MSVT
Table F.1 – Technical requirements of MSVTs
Table F.2 – Maximum permissible limits of error of MTU with MSVT
78 Annex G (normative)Isolating current transformer (ICT)
G.1 General
G.2 Definitions
G.3 Application
Figure G.1 – Testing of three-phase meters with closed linkbetween the voltage and current circuits
79 G.4 Technical requirements
G.5 Wiring and terminals
G.6 Total accuracy of MTU with ICT
Table G.1 – Technical requirements of ICT
80 Table G.2 – Maximum permissible limits of error of MTU with ICTs
81 Bibliography

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