Electricity metering equipment - General requirements, tests and test conditions - Part 11: Metering equipment

IEC 62052-11:2020 (E) specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters. This document details functional, mechanical, electrical and marking requirements, test methods, and test conditions, including immunity to external influences covering electromagnetic and climatic environments.
This document applies to electricity metering equipment designed to:
• measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC, or 1 500 V DC;
• have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays;
• operate with integrated displays (electromechanical or static meters);
• operate with detached indicating displays, or without an indicating display (static meters only);
• be installed in a specified matching sockets or racks;
• optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with Low Power Instrument Transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document and the relevant IEC 62053 series documents only if such meters and their LPITs are tested together as directly connected meters.
This document is also applicable to auxiliary input and output circuits, operation indicators, and test outputs of equipment for electrical energy measurement.
This document also covers the common aspects of accuracy testing such as reference conditions, repeatability and measurement of uncertainty.
This document does not apply to:
• meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC, or 1 500 V DC;
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series of standards) when tested without such transformers;
• metering systems comprising multiple devices (except of LPITs) physically remote from one another;
• portable meters;
• meters used in rolling stock, vehicles, ships and airplanes;
• laboratory and meter test equipment;
• reference standard meters;
• data interfaces to the register of the meter;
• matching sockets or racks used for installation of electricity metering equipment;
• any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering).
This second edition cancels and replaces the first edition published in 2003, and its amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Removed all meter safety requirements; the meter safety requirements are covered in IEC 62052-31:2015;
b) Included requirements for meter power consumption and voltage requirements from IEC 62053-61; IEC 62053-61 is withdrawn;
c) Included requirements for meter symbols from IEC 62053-52; IEC 62053-52 is withdrawn;
d) Included requirements for meter pulse output devices from IEC 62053-31; IEC 62053-31 is withdrawn;
e) Added new requirements and tests including: meters with detached indicating displays, and meters without indicating displays, meter sealing provisions; measurement uncertainty and repeatability; time-keeping accuracy; type test report
f) Updated and clarified acceptance criteria for testing of external influences;
g) Revised and updated tests for immunity to electromagnetic influences and disturbances as per the latest editions of the basic EMC publications.

General Information

Status
Published
Publication Date
28-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
29-Jun-2020
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IEC 62052-11
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
Electricity metering equipment – General requirements, tests and test
conditions –
Part 11: Metering equipment
IEC 62052-11:2020-06(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62052-11
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
Electricity metering equipment – General requirements, tests and test
conditions –
Part 11: Metering equipment
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20 ISBN 978-2-8322-8437-7

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 62052-11:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 8

INTRODUCTION ................................................................................................................... 10

1 Scope ............................................................................................................................ 13

2 Normative references .................................................................................................... 14

3 Terms and definitions .................................................................................................... 17

3.1 General definitions ................................................................................................ 17

3.2 Definitions related to the functional elements ........................................................ 21

3.3 Definitions of meter ports ...................................................................................... 24

3.4 Definitions of mechanical elements ....................................................................... 25

3.5 Definitions related to measurements ..................................................................... 27

3.6 Definitions related to external influences ............................................................... 30

3.7 Definition of tests .................................................................................................. 33

3.8 Definitions related to electromechanical meters .................................................... 33

3.9 Definitions related to meter marking and symbols ................................................. 34

4 Nominal electrical values ............................................................................................... 35

4.1 Voltages ............................................................................................................... 35

4.1.1 Nominal voltages ........................................................................................... 35

4.1.2 Voltage ranges .............................................................................................. 36

4.2 Currents ................................................................................................................ 36

4.2.1 Nominal currents ........................................................................................... 36

4.2.2 Starting current .............................................................................................. 36

4.2.3 Minimum current ............................................................................................ 36

4.2.4 Maximum current ........................................................................................... 37

4.2.5 Current ranges .............................................................................................. 37

4.3 Frequencies .......................................................................................................... 37

4.3.1 Nominal frequencies ...................................................................................... 37

4.3.2 Frequency ranges .......................................................................................... 37

4.4 Power consumption ............................................................................................... 37

5 Construction requirements ............................................................................................. 39

5.1 General ................................................................................................................. 39

5.2 Mechanical tests ................................................................................................... 39

5.2.1 Shock test ..................................................................................................... 39

5.2.2 Vibration test ................................................................................................. 40

5.3 Window ................................................................................................................. 40

5.4 Terminals – Terminal block(s) – Protective conductor terminal .............................. 40

5.5 Sealing provisions ................................................................................................. 40

5.5.1 General ......................................................................................................... 40

5.5.2 Meter case .................................................................................................... 40

5.5.3 Meter terminals .............................................................................................. 41

5.5.4 Sealing of detached indicating displays ......................................................... 41

5.5.5 Sealing of LPIT connections .......................................................................... 41

5.5.6 Sealing of meter configuration ....................................................................... 42

5.6 Display of measured values .................................................................................. 42

5.6.1 General ......................................................................................................... 42

5.6.2 Meters without indicating displays.................................................................. 42

5.6.3 Meters with indicating displays ...................................................................... 42

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IEC 62052-11:2020 © IEC 2020 – 3 –

5.7 Storage of measured values ................................................................................. 43

5.8 Pulse outputs ........................................................................................................ 43

5.8.1 General ......................................................................................................... 43

5.8.2 Optical test output ......................................................................................... 43

5.8.3 Electrical pulse output ................................................................................... 45

5.8.4 Operation indicator ........................................................................................ 45

5.9 Electrical pulse inputs ........................................................................................... 46

5.9.1 General characteristics .................................................................................. 46

5.9.2 Functional tests of electrical pulse inputs ....................................................... 46

5.10 Auxiliary power supply .......................................................................................... 46

6 Meter marking and documentation ................................................................................. 47

6.1 Meter accuracy class marking ............................................................................... 47

6.2 Meter marking ....................................................................................................... 47

6.3 Connection diagrams and terminal marking ........................................................... 51

6.4 Symbols ................................................................................................................ 51

6.4.1 General ......................................................................................................... 51

6.4.2 Symbols for the measuring elements ............................................................. 52

6.4.3 Symbols for transformer-operated meters ...................................................... 52

6.4.4 Identification of the displayed information ...................................................... 52

6.4.5 Marking of the measured quantity .................................................................. 53

6.4.6 Symbols of principal units used for meters (see Table 8) ............................... 53

6.4.7 Symbols for auxiliary devices ......................................................................... 54

6.4.8 Symbols for details of the suspension of the moving element ......................... 54

6.4.9 Symbols for communication ports .................................................................. 54

6.5 Documentation ...................................................................................................... 54

6.5.1 Installation manuals ....................................................................................... 54

6.5.2 Instruction for use .......................................................................................... 54

7 Metrological performance requirements and tests .......................................................... 54

7.1 General test conditions ......................................................................................... 54

7.2 Methods of accuracy verification ........................................................................... 56

7.3 Measurement uncertainty ...................................................................................... 56

7.4 Meter constant ...................................................................................................... 57

7.5 Initial start-up of the meter .................................................................................... 57

7.6 Test of no-load condition ....................................................................................... 58

7.7 Starting current test .............................................................................................. 58

7.8 Repeatability test .................................................................................................. 59

7.9 Limits of error due to variation of the current ......................................................... 59

7.10 Limits of error due to influence quantities .............................................................. 60

7.11 Time-keeping accuracy ......................................................................................... 60

8 Climatic requirements .................................................................................................... 60

8.1 General ................................................................................................................. 60

8.2 Environmental conditions ...................................................................................... 60

8.3 Tests of the effects of the climatic environments ................................................... 60

8.3.1 General test requirements ............................................................................. 60

8.3.2 Acceptance criteria ........................................................................................ 61

8.3.3 Dry heat test .................................................................................................. 61

8.3.4 Cold test ........................................................................................................ 61

8.3.5 Damp heat cyclic test .................................................................................... 61

8.3.6 Protection against solar radiation ................................................................... 62

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8.4 Durability .............................................................................................................. 62

9 The effects of external influence quantities and disturbances ........................................ 62

9.1 General ................................................................................................................. 62

9.2 Acceptance criteria ............................................................................................... 64

9.3 Electromagnetic compatibility (EMC) ..................................................................... 65

9.3.1 General ......................................................................................................... 65

9.3.2 Voltage dips and short interruptions ............................................................... 67

9.3.3 Electrostatic discharge immunity test ............................................................. 69

9.3.4 Radiated, radio-frequency, electromagnetic field immunity test – test

without current ............................................................................................... 69

9.3.5 Radiated, radio-frequency, electromagnetic field immunity test – test

with current.................................................................................................... 70

9.3.6 Electrical fast transient/burst immunity test .................................................... 70

9.3.7 Immunity to conducted disturbances, induced by radio-frequency fields ......... 71

9.3.8 Test for immunity to conducted, differential mode disturbances and

signalling in the frequency range 2 kHz to 150 kHz at AC power ports ........... 71

9.3.9 Surge immunity test ....................................................................................... 72

9.3.10 Ring wave immunity test ................................................................................ 74

9.3.11 Damped oscillatory wave immunity test ......................................................... 74

9.3.12 External static magnetic fields ....................................................................... 75

9.3.13 Power frequency magnetic field immunity test ............................................... 76

9.3.14 Emission requirements .................................................................................. 76

9.4 Tests of immunity to other influence quantities ...................................................... 77

9.4.1 General ......................................................................................................... 77

9.4.2 Harmonics in the current and voltage circuits ................................................. 77

9.4.3 Voltage variation ............................................................................................ 78

9.4.4 Ambient temperature variation ....................................................................... 79

9.4.5 Interruption of phase voltage ......................................................................... 79

9.4.6 Frequency variation ....................................................................................... 80

9.4.7 Reversed phase sequence ............................................................................. 80

9.4.8 Auxiliary voltage variation .............................................................................. 80

9.4.9 Operation of auxiliary devices ........................................................................ 81

9.4.10 Short-time overcurrents ................................................................................. 81

9.4.11 Self-heating ................................................................................................... 82

9.4.12 Fast load current variations ........................................................................... 82

9.4.13 Earth fault ...................................................................................................... 83

10 Type test ....................................................................................................................... 83

10.1 Test conditions ..................................................................................................... 83

10.2 Type test report .................................................................................................... 84

Annex A (normative) Optical test output ............................................................................... 85

Annex B (normative) Class A and class B electrical pulse outputs ....................................... 86

B.1 Electrical characteristics of pulse output ............................................................... 86

B.2 Electrical output pulse waveform ........................................................................... 87

B.3 Test of electrical pulse output ............................................................................... 87

B.4 Test of pulse input ................................................................................................ 87

Annex C (normative) Electrical pulse output for special applications and long

distances according to IEC 60381-1:1982 ............................................................................. 89

C.1 Specified operating conditions and output pulse waveform .................................... 89

C.2 Test of pulse output .............................................................................................. 90

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IEC 62052-11:2020 © IEC 2020 – 5 –

C.3 Test of pulse input ................................................................................................ 91

Annex D (informative) Meter symbols and markings ............................................................. 92

Annex E (informative) Meter ports ........................................................................................ 97

Annex F (informative) Test set-up for EMC tests ................................................................ 100

Annex G (informative) Test for immunity to conducted, differential mode disturbances

and signalling in the frequency range 2 kHz to 150 kHz at AC power ports ......................... 102

Annex H (normative) Test circuit diagrams for testing influence of harmonics and

interharmonics .................................................................................................................... 103

Annex I (informative) Short time overcurrent test waveform ............................................... 109

Annex J (informative) Fast load current variation test ......................................................... 110

Annex K (normative) Electromagnet for testing the influence of externally produced

magnetic fields.................................................................................................................... 111

K.1 Permanent magnet for testing the influence of external static magnetic field ....... 111

K.2 Electromagnet for testing the influence of external static magnetic field with

magneto-motive force of 1 000 At (ampere-turns) (see Figure K.1) ..................... 111

Annex L (normative) Test circuit diagram for the test of immunity to earth fault .................. 113

Annex M (informative) Meter current range ........................................................................ 114

Annex N (informative) Application to Branch Circuit Power Meters ..................................... 115

N.1 Overview............................................................................................................. 115

N.2 Definitions........................................................................................................... 115

N.3 General ............................................................................................................... 115

N.4 Cross-channel influences .................................................................................... 116

N.5 Channel configuration and sealing for multi-branch meters ................................. 116

N.6 Verification for multi-branch meters ..................................................................... 116

Annex O (informative) Overview of the technical changes .................................................. 117

Annex P (informative) Test schedule – Recommended test sequences ............................. 118

Figure A.1 – Test arrangement for the test output ................................................................. 85

Figure A.2 – Waveform of the optical test output ................................................................... 85

Figure B.1 – Physical interface of the electrical pulse output ................................................. 86

Figure B.2 – Electrical output pulse waveform ....................................................................... 87

Figure B.3 – Pulse output test set-up .................................................................................... 87

Figure B.4 – Pulse input test set-up ...................................................................................... 88

Figure C.1 – Output pulse waveform ..................................................................................... 90

Figure C.2 – Pulse output test set-up .................................................................................... 90

Figure C.3 – Pulse input test set-up ...................................................................................... 91

Figure E.1 – Typical port configuration of a directly connected meter (example) ................... 97

Figure E.2 – Typical port configuration of a transformer operated meter (example) ............... 98

Figure E.3 – Typical port configuration of a LPIT operated meter with a detached

indicating display (example) .................................................................................................. 98

Figure F.1 – Test set-up for the electrical fast transient/burst immunity test for

transformer oper-ated meters: each port (Mains, CT, HLV, ELV) is tested separately by

adding the coupling device to the respective port ................................................................ 100

Figure F.2 – Test set-up for the electrical fast transient/burst immunity test for directly

connected meters: each port (Mains, HLV, ELV) is tested separately by adding the

coupling device to the respective port ................................................................................. 101

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– 6 – IEC 62052-11:2020 © IEC 2020

Figure G.1 – Example of a test set-up for immunity to conducted, differential mode

disturbances and signalling in the frequency range 2 kHz to 150 kHz at AC power ports

(from IEC 61000-4-19: 2014) .............................................................................................. 102

Figure H.1 – Test circuit diagram (informative, test of influence of interharmonics and

odd harmonics) ................................................................................................................... 103

Figure H.2 – Burst fired wave-form (interharmonics) ........................................................... 104

Figure H.3 – Informative distribution of interharmonic content of burst-fired waveform

(the Fourier analysis is not complete) ................................................................................. 104

Figure H.4 – Phase fired waveform (odd harmonics) – 90° fired waveform .......................... 105

Figure H.5 – Informative distribution of harmonic content of 90° phase fired waveform

(the Fourier analysis is not complete) ................................................................................. 105

Figure H.6 – Phase fired waveform (odd harmonics) – 45° fired waveform .......................... 106

Figure H.7 – Phase fired waveform (odd harmonics) – 135° fired waveform ........................ 106

Figure H.8 – Test circuit diagram for half-wave rectification (DC and even harmonics) ........ 107

Figure H.9 – Half-wave rectified waveform (DC and even harmonics) ................................. 107

Figure H.10 – Informative distribution of harmonic content of half-wave rectified

waveform (the Fourier analysis is not complete) ................................................................. 108

Figure K.1 – Electromagnet for testing the influence of external static magnetic field

with magneto-motive force of 1 000 At (ampere-turns) ........................................................ 112

Figure L.1 – Circuit to simulate earth fault condition in phase 1 .......................................... 113

Figure L.2 – Voltages at the meter under test ..................................................................... 113

Figure M.1 – Meter current range ........................................................................................ 114

Table 1 – Nominal voltages ................................................................................................... 35

Table 2 – Voltage ranges ...................................................................................................... 36

Table 3 – Preferred values of nominal currents ..................................................................... 36

Table 4 – Current ranges ...................................................................................................... 37

Table 5 – Frequency ranges ................................................................................................. 37

Table 6 – Maximum power consumption................................................................................ 38

Table 7 – Marking and documentation requirements ............................................................. 49

Table 8 – Symbols of principal units used for meters ............................................................ 53

Table 9 – Voltage and current balance .................................................................................. 55

Table 10 – Reference conditions ........................................................................................... 55

Table 11 – Repeatability test points ...................................................................................... 59

Table 12 – Environmental conditions .................................................................................... 60

Table 13 – Summary of the tests of immunity to influence quantities ..................................... 63

Table 14 – Summary of the tests of immunity to disturbances ............................................... 64

Table 15 – Acceptance criteria .............................................................................................. 65

Table 16 – Voltage dips, short interruptions and voltage variations i
...

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