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eLibrary > BS EN IEC 62057-1:2023 Electrical energy meters. Test equipment, techniques and procedures - Stationary meter test units (MTUs) >

BS EN IEC 62057-1:2023 Electrical energy meters. Test equipment, techniques and procedures - Stationary meter test units (MTUs), 2023

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BS EN IEC 62057-1:2023 Electrical energy meters. Test equipment, techniques and procedures - Stationary meter test units (MTUs), 2023

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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
1 Scope
2 Normative references
3 Terms and definitions [Go to Page]
3.1 Definitions related to the elements of the MTU
3.2 Definitions of active, reactive and apparent power
3.3 Definitions related to influence quantities
3.4 Definitions related to accuracy
3.5 Definitions related to testing
4 Meter test units and automated meter test units
5 Meter accuracy test methods [Go to Page]
5.1 General
5.2 Energy comparison method
5.3 Power–time measurement method (wattmeter method with register reading)
5.4 Pulse comparison method
6 Standard electrical values [Go to Page]
6.1 Mains supply
6.2 Output values and ranges of the test circuits [Go to Page]
6.2.1 Test voltage circuit
6.2.2 Test current circuit
Tables [Go to Page]
Table 1 – Mains power supply condition
Table 2 – Test voltage circuit for each phase [Go to Page]
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 [Go to Page]
6.2.5 Harmonics
6.3 Standard meter [Go to Page]
6.3.1 Accuracy class
6.3.2 Standard electrical values
Table 6 – Setting of harmonics
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)
6.6 Error calculation system [Go to Page]
6.6.1 Functional requirements
6.6.2 Parameters
7 Constructional requirements of the MTU [Go to Page]
7.1 General requirements
7.2 Source and standard meter
Table 9 – Parameters for the error calculation system
7.3 Meter mounting system [Go to Page]
7.3.1 General
7.3.2 Terminals
8 Information and marking requirements [Go to Page]
8.1 General
Table 10 – Information requirements
8.2 Labels, signs and signals
8.3 Information for selection [Go to Page]
8.3.1 General
8.3.2 General information
8.3.3 Information related to standard meters
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
8.4 Information for installation and commissioning [Go to Page]
8.4.1 General
8.4.2 Dimensions and mass
8.4.3 Connection
8.4.4 Protection – Protective class and earthing
8.4.5 Self-consumption
8.5 Information for use [Go to Page]
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
9 Climatic conditions for the MTU [Go to Page]
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
10 Electrical requirements of the MTU [Go to Page]
10.1 Influence of mains supply
10.2 Insulation [Go to Page]
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
11 Electromagnetic compatibility [Go to Page]
11.1 General requirements and performance criteria
Table 13 – AC voltage tests
11.2 General test conditions [Go to Page]
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 [Go to Page]
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
11.2.8 Radio interference suppression
12 Standard meter [Go to Page]
12.1 General
12.2 Accuracy requirements under reference conditions
12.3 Limits of error due to influence quantities
Table 15 – Relative error limits for the standard meter
Table 16 – Influence quantities
12.4 Accuracy tests in the presence of harmonics [Go to Page]
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 [Go to Page]
13.1 Application
13.2 Identification
13.3 Protection
13.4 Functional requirements
13.5 Control and supervision of the MTU by the software
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
14 Accuracy requirements and tests [Go to Page]
14.1 General
14.2 Test methods for determination of the MTU accuracy
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)
14.4 Accuracy requirements [Go to Page]
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 [Go to Page]
14.4.3 Mean value and repeatability of the measurements
Table 20 – Limits of permissible values of standard deviation of MTU
14.5 Check of measurement results of the MTU [Go to Page]
14.5.1 Basic measurements of the MTU
14.5.2 Maintenance measurement of the MTU
14.6 Tests and testing procedures [Go to Page]
14.6.1 Type tests
14.6.2 Routine tests
14.6.3 Acceptance test
14.6.4 Commissioning test
Annexes [Go to Page]
Annex A (informative)Symbols according to IEC 60417
Table A.1 – Symbols which may be used on metering equipment
Annex B (normative)Reference conditions
Table B.1 – Reference conditions
Annex C (informative)Test circuits and test signals for testing in the presence of harmonics [Go to Page]
C.1 General
C.2 Phase fired control (odd harmonics)
Figures [Go to Page]
Figure C.1 – Test circuit diagram (informative)
Figure C.2 – Phase fired waveform
Figure C.3 – Informative distribution of harmonic content of phase fired waveform(the Fourier analysis is not complete) [Go to Page]
C.3 Burst control (sub-harmonics)
Figure C.4 – Burst fired waveform
Figure C.5 – Informative distribution of harmonics (the Fourier analysis is not complete)
Annex D (informative)Calculation of errors and the associatedexpanded measurement uncertainty [Go to Page]
D.1 General
D.2 Degrees of freedom and sensitivity coefficient
D.3 Method for the determination of the standard measurement uncertainty [Go to Page]
D.3.1 Type A
Table D.1 – Coverage factors k for different effective degrees of freedom Veff [Go to Page]
[Go to Page]
D.3.2 Type B
D.4 Examples for the calculation of the measurement uncertainty [Go to Page]
D.4.1 Measuring principle
D.4.2 Model equation
Figure D.1 – Measuring setup of the meter test arrangement [Go to Page]
[Go to Page]
D.4.3 Measurement uncertainty budget considering the specification for the working standard
Table D.2 – List 1 of quantities
Table D.3 – Readings 1 of the DUT
Table D.4 – Reading 1 of the standard meter
Table D.5 – Measurement uncertainty budget 1 [Go to Page]
[Go to Page]
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
Table D.8 – Reading 2 of the standard meter [Go to Page]
D.5 Indication of the measurement uncertainty
Table D.9 – Measurement uncertainty budget 2
Annex E (informative)Guidelines for overall laboratory setup [Go to Page]
E.1 General
E.2 General conditions
E.3 Quality of mains supply
E.4 Reference standard
Table E.1 – Mains supply quality
Annex F (normative)Multi-secondary voltage transformer [Go to Page]
F.1 General
F.2 Definitions
F.3 Application
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) [Go to Page]
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
Annex G (normative)Isolating current transformer (ICT) [Go to Page]
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 [Go to Page]
G.4 Technical requirements
G.5 Wiring and terminals
G.6 Total accuracy of MTU with ICT
Table G.1 – Technical requirements of ICT
Table G.2 – Maximum permissible limits of error of MTU with ICTs
Bibliography [Go to Page]

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