Electricity metering equipment - Particular requirements - Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)

IEC 62053-21:2020 applies only to static watt-hour meters of accuracy classes 0,5, 1 and 2 for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests only.
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;
• have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays;
• operate with integrated or detached indicating displays, or without an indicating display;
• be installed in a specified matching socket or rack;
• 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 only if such meters and their LPITs are tested together and meet the requirements for directly connected meters.
This document does not apply to:
• meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC;
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series) when tested without such transformers;
• metering systems comprising multiple devices (except 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) Replaced Ib with In; Ib is no longer used when referencing directly connected meters.
c) Moved the descriptions of all general requirements and test methods from IEC 62053-21: 2003, IEC 62053-22: 2003, IEC 62053-23: 2003, IEC 62053-24: 2003 to IEC 62052-11:2020; IEC 62053-21:2020, IEC 62053-22:2020, IEC 62053-23:2020, IEC 62053-24:2020 contain only accuracy class specific requirements.
d) Added new requirements and tests concerning:
1) measurement uncertainty and repeatability (7.3, 7.8);
2) influence of fast load current variations (9.4.12);
3) immunity to conducted differential current disturbances in the 2 kHz to 150 kHz frequency range (9.3.8).
e) Meters designed for operation with low power instrument transformers (LPITs) may be tested for compliance with this document as directly connected meters.

Équipement de comptage de l'électricité - Exigences particulières - Partie 21: Compteurs statiques d'énergie active en courant alternatif (classes 0,5, 1 et 2)

IEC 62053-21:2020 est applicable uniquement aux compteurs statiques d'énergie active des classes de précision 0,5, 1 et 2, destinés à la mesure de l'énergie électrique active en courant alternatif sur les réseaux électriques en 50 Hz et 60 Hz, et à leurs essais de type.
Le présent document s'applique aux équipements de comptage de l'électricité conçus pour:
• mesurer et piloter l'énergie électrique sur les réseaux électriques (secteur) avec une tension allant jusqu'à 1 000 V;
• avoir tous les éléments fonctionnels, y compris les modules complémentaires, incorporés dans ou formant un boîtier de compteur unique, à l'exception des afficheurs;
• fonctionner avec des afficheurs intégrés ou séparés, ou sans afficheur;
• être installés dans une embase ou un bâti correspondant spécifié;
• assurer, en option, des fonctions autres que celles relatives au comptage de l'énergie électrique.
Les compteurs conçus pour être utilisés avec des transformateurs de mesure de faible puissance (LPIT, Low Power Instrument Transformers, définis dans la série IEC 61869) ne peuvent être soumis à des essais de conformité au présent document que si ces compteurs et leurs LPIT sont soumis à l'essai ensemble et satisfont aux exigences relatives aux compteurs à branchement direct.
Le présent document ne s'applique pas:
• aux compteurs dont la tension phase-neutre déduite des tensions nominales dépasse 1 000 V;
• aux compteurs destinés à être connectés à des transformateurs de mesure de faible puissance (LPIT, définis dans la série IEC 61869) lorsqu'ils sont soumis à l'essai sans ces transformateurs;
• aux systèmes de comptage comprenant plusieurs dispositifs (à l'exception des LPIT) physiquement éloignés les uns des autres;
• aux compteurs portatifs;
• aux compteurs utilisés dans le matériel roulant, les véhicules, les navires et les avions;
• aux équipements de laboratoire et d'essai des compteurs;
• aux compteurs étalons de référence;
• aux interfaces de données avec l'élément indicateur du compteur;
• aux embases ou bâtis correspondants utilisés pour l'installation des équipements de comptage de l'électricité;
• à toute fonction complémentaire assurée par les compteurs d'énergie électrique.
Le présent document ne couvre pas les mesures de détection et de prévention des tentatives frauduleuses de compromettre les performances du compteur (falsification).
Cette deuxième édition annule et remplace la première édition parue en 2003 et son amendement 1:2016. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: voir Annexe B.

General Information

Status
Published
Publication Date
16-Jun-2020
Current Stage
PPUB - Publication issued
Completion Date
17-Jun-2020
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IEC 62053-21
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – Particular requirements –
Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
Équipement de comptage de l'électricité – Exigences particulières –
Partie 21: Compteurs statiques d'énergie active en courant alternatif
(classes 0,5, 1 et 2)
IEC 62053-21:2020-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62053-21
Edition 2.0 2020-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering equipment – Particular requirements –
Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
Équipement de comptage de l'électricité – Exigences particulières –
Partie 21: Compteurs statiques d'énergie active en courant alternatif
(classes 0,5, 1 et 2)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-8438-4

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 62053-21:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 9

3 Terms and definitions ...................................................................................................... 9

4 Standard electrical values................................................................................................ 9

4.1 Voltages ................................................................................................................. 9

4.2 Currents ................................................................................................................ 10

4.2.1 Nominal currents ........................................................................................... 10

4.2.2 Starting current .............................................................................................. 10

4.2.3 Minimum current ............................................................................................ 10

4.2.4 Maximum current ........................................................................................... 10

4.3 Frequencies .......................................................................................................... 10

4.4 Power consumption ............................................................................................... 10

5 Construction requirements ............................................................................................. 10

6 Meter marking and documentation ................................................................................. 10

7 Accuracy requirements .................................................................................................. 11

7.1 General test conditions ......................................................................................... 11

7.2 Methods of accuracy verification ........................................................................... 11

7.3 Measurement uncertainty ...................................................................................... 11

7.4 Meter constant ...................................................................................................... 11

7.5 Initial start-up of the meter .................................................................................... 11

7.6 Test of no-load condition ....................................................................................... 11

7.7 Starting current test .............................................................................................. 11

7.8 Repeatability test .................................................................................................. 11

7.9 Limits of error due to variation of the current ......................................................... 11

7.10 Limits of error due to influence quantities .............................................................. 12

7.11 Time-keeping accuracy ......................................................................................... 14

8 Climatic requirements .................................................................................................... 14

9 The effects of external influences .................................................................................. 15

10 Type test ....................................................................................................................... 15

Annex A (informative) Comparison of acceptable percentage error limits at reference

conditions for meters of classes 0,5, 1, and 2 ....................................................................... 16

Annex B (informative) Summary of changes ......................................................................... 17

Figure A.1 – Comparison of acceptable percentage error limits for meters of classes

0,5, 1 and 2, with I = 5 A and I = 10 A, at PF = 1,0, for direct connection ....................... 16

n max

Figure A.2 – Comparison of acceptable percentage error limits for meters of classes

0,5, 1 and 2, with I = 5 A and I = 10 A, at PF = 0,5 inductive, for direct connection ........ 16

n max

Table 1 – Starting current ..................................................................................................... 10

Table 2 – Minimum current.................................................................................................... 10

Table 3 – Acceptable percentage error limits (single-phase meters and poly-phase

meters with balanced loads or single-phase loads) ............................................................... 12

---------------------- Page: 4 ----------------------
IEC 62053-21:2020 © IEC 2020 – 3 –

Table 4 – Acceptable limits of variation in percentage error due to influence quantities ......... 13

---------------------- Page: 5 ----------------------
– 4 – IEC 62053-21:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING EQUIPMENT –
PARTICULAR REQUIREMENTS –
Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62053-21 has been prepared by IEC technical committee 13:

Electrical energy measurement and control.

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: see Annex B.
The text of this International Standard is based on the following documents:
FDIS Report on voting
13/1805A/FDIS 13/1813/RVD

Full information on the voting for the approval of this International Standard can be found in the

report on voting indicated in the above table.
---------------------- Page: 6 ----------------------
IEC 62053-21:2020 © IEC 2020 – 5 –

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 62053 series, published under the general title Electricity metering

equipment – Particular requirements, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing

organizations may need a transitional period following publication of a new, amended or revised IEC publication in

which to make products in accordance with the new requirements and to equip themselves for conducting new or

revised tests.

It is the recommendation of the committee that the content of this publication be adopted for implementation nationally

not earlier than 2 years from the date of publication.
---------------------- Page: 7 ----------------------
– 6 – IEC 62053-21:2020 © IEC 2020
INTRODUCTION

This part of IEC 62053 is to be used with relevant parts of the IEC 62052, IEC 62058 and

IEC 62059 series, Electricity metering equipment, and with the IEC 62055 series, Electricity

metering – Payment systems:
IEC 62052‑11:2020, Electricity metering equipment – General requirements, tests
and test conditions – Part 11: Metering equipment
IEC 62052‑31:2015, Electricity metering equipment (AC) – General requirements,
tests and test conditions – Part 31: Product safety
requirements and tests

IEC 62053‑11:2003, Electricity metering equipment (AC) – Particular requirements

– Part 11: Electromechanical meters for active energy
(classes 0,5, 1 and 2)
IEC 62053‑22:2020, Electricity metering equipment – Particular requirements –
Part 22: Static meters for AC active energy (classes 0,1 S, 0,2
S and 0,5 S)
IEC 62053‑23:2020, Electricity metering equipment – Particular requirements –
Part 23: Static meters for reactive energy (classes 2 and 3)
IEC 62053‑24:2020, Electricity metering equipment – Particular requirements –
Part 24: Static meters for fundamental component reactive
energy (classes 0,5 S, 1S, 1, 2 and 3)
IEC 62053‑41: –, Electricity metering equipment– Particular requirements –
Part 41: Static meters for direct current energy (classes 0,5
and 1)
IEC 62055‑31:2005, Electricity metering – Payment systems – Part 31: Particular
requirements – Static payment meters for active energy
(classes 1 and 2)
IEC 62057‑1: – Test equipment, techniques and procedures for electrical
energy meters – Part 1: Stationary Meter Test Units (MTU)

IEC 62058‑11:2008, Electricity metering equipment (AC) – Acceptance inspection -

–Part 11: General acceptance inspection methods
IEC 62058‑21:2008, Electricity metering equipment (AC) – Acceptance inspection
– Part 21: Particular requirements for electromechanical
meters for active energy (classes 0,5, 1 and 2)
IEC 62058‑31:2008, Electricity metering equipment (AC) – Acceptance inspection
– Part 31: Particular requirements for static meters for active
energy (classes 0,2 S, 0,5 S, 1 and 2)
IEC 62059‑11:2002, Electricity metering equipment – Dependability – Part 11:
General concepts
IEC 62059‑21:2002, Electricity metering equipment – Dependability – Part 21:
Collection of meter dependability data from the field

IEC 62059‑32‑1:2011, Electricity metering equipment – Dependability – Part 32-1:

Durability – Testing of the stability of metrological
characteristics by applying elevated temperature

This part is a standard for type testing electricity meters. It covers the particular requirements

for meters, being used indoors and outdoors in large quantities worldwide. It does not deal with

special implementations (such as metering-part and/or displays in separate housings).

---------------------- Page: 8 ----------------------
IEC 62053-21:2020 © IEC 2020 – 7 –

This document is intended to be used in conjunction with IEC 62052-11:2020 and with

IEC 62052-31: 2015. When any requirement in this document concerns an item already covered

in IEC 62052-11:2020 or in IEC 62052-31:2015, the requirements of this document take

precedence over the requirements of IEC 62052-11:2020 or of IEC 62052-31:2015.

The test levels are regarded as minimum values that provide for the proper functioning of the

meter under normal working conditions. For special applications, additional test levels might be

necessary and are subject to an agreement between the manufacturer and the purchaser.

---------------------- Page: 9 ----------------------
– 8 – IEC 62053-21:2020 © IEC 2020
ELECTRICITY METERING EQUIPMENT –
PARTICULAR REQUIREMENTS –
Part 21: Static meters for AC active energy (classes 0,5, 1 and 2)
1 Scope

This part of IEC 62053 applies only to static watt-hour meters of accuracy classes 0,5, 1 and 2

for the measurement of alternating current electrical active energy in 50 Hz or 60 Hz networks

and it applies to their type tests only.

NOTE 1 For other general requirements, such as safety, dependability, etc., see the relevant IEC 62052 or

IEC 62059 standards.
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;

NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal

voltages. See IEC 62052-31: 2015, Table 7.

• have all functional elements, including add-on modules, enclosed in, or forming a single

meter case with exception of indicating displays;

• operate with integrated or detached indicating displays, or without an indicating display;

• be installed in a specified matching socket or rack;

• 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 only if such meters and

their LPITs are tested together and meet the requirements for directly connected meters.

NOTE 3 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,

current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control

functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data

security functions. The relevant standards for these functions may apply in addition to the requirements of this

document. However, the requirements for such functions are outside the scope of this document.

NOTE 4 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such

as voltage magnitude, current magnitude, power, frequency, etc., are covered in IEC 61557-12. However, devices

compliant with IEC 61557-12 are not intended to be used as billing meters unless they are also compliant with

IEC 62052-11:2020 and one or more relevant IEC 62053-xx accuracy class standards.

NOTE 5 Product requirements for power quality instruments (PQIs) are covered in IEC 62586-1. Requirements for

power quality measurement techniques (functions) are covered in IEC 61000-4-30. Requirements for testing of the

power quality measurement functions are covered in IEC 62586-2.
This document does not apply to:

• meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V

• meters intended for connection with low power instrument transformers (LPITs as defined

in the IEC 61869 series) when tested without such transformers;

• metering systems comprising multiple devices (except LPITs) physically remote from one

another;
• portable meters;
NOTE 6 Portable meters are meters that are not permanently connected.
---------------------- Page: 10 ----------------------
IEC 62053-21:2020 © IEC 2020 – 9 –
• 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).

NOTE 7 Nevertheless, specific tampering detection and prevention requirements, and test methods, as relevant for

a particular market are subject to the agreement between the manufacturer and the purchaser.

NOTE 8 Specifying requirements and test methods for fraud detection and prevention would be counterproductive,

as such specifications would provide guidance for potential fraudsters.

NOTE 9 There are many types of meter tampering reported from various markets; therefore, designing meters to

detect and prevent all types of tampering could lead to unjustified increase in costs of meter design, verification and

validation.

NOTE 10 Billing systems, such as, smart metering systems, are capable of detecting irregular consumption patterns

and irregular network losses which enable discovery of suspected meter tampering.

NOTE 11 For transformer operated meters paired with current transformers (CTs) according to IEC 61869-2:

– the standard CT measuring range is specified from 0,05 I to I for accuracy classes 0,1, 0,2, 0,5 and 1 and

n max
these CTs are used for meters of class 0,5, 1 and 2 according to this document;

– the special CT measuring range is specified from 0,01 I to I for accuracy classes 0,2 S and 0,5 S and these

n max

CTs are used for meters of class 0,1 S, 0,2 S and 0,5 S according to 62053-22:2020;

– combinations of standard CTs and meters of class 0,1 S, 0,2 S and 0,5 S are subject to an agreement between

manufacturers and purchasers.

NOTE 12 This document does not specify emission requirements, these are specified in IEC 62052-11:2020, 9.3.14.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 62052-11:2020, Electricity metering equipment – General requirements, tests and test

conditions – Part 11: Metering equipment
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62052-11:2020 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia website: http://www.electropedia.org/
• ISO Online Browsing Platform website: http://www.iso.org/obp
4 Standard electrical values
4.1 Voltages
The values given in IEC 62052-11:2020 apply.
---------------------- Page: 11 ----------------------
– 10 – IEC 62053-21:2020 © IEC 2020
4.2 Currents
4.2.1 Nominal currents
The values given in IEC 62052-11:2020 apply.
4.2.2 Starting current

The requirements and acceptance criteria of IEC 62052-11:2020 apply (see Table 1).

Table 1 – Starting current
Meters for Starting current I Power
factor
class 0,5 class 1 class 2 cos φ
Direct connection 0,004 I 0,004 I 0,005 I 1
n n n
Connection through current transformers 0,002 I 0,002 I 0,003 I 1
n n n
4.2.3 Minimum current

The requirements and acceptance criteria of IEC 62052-11:2020 apply (see Table 2).

Table 2 – Minimum current
Meters for Minimum current I
min
class 0,5, class 1 and class 2
Direct connection 0,05 I
Connection through current 0,02 I
transformers
4.2.4 Maximum current
The requirements and acceptance criteria of IEC 62052-11:2020 apply.
4.3 Frequencies
The values given in IEC 62052-11:2020 apply.
4.4 Power consumption

The requirements, test conditions and procedures, and acceptance criteria of IEC 62052-

11:2020 apply.
5 Construction requirements
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
6 Meter marking and documentation
The requirements of IEC 62052-11:2020 apply.
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IEC 62053-21:2020 © IEC 2020 – 11 –
7 Accuracy requirements
7.1 General test conditions
The test conditions of IEC 62052-11:2020 apply.
7.2 Methods of accuracy verification
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.3 Measurement uncertainty
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.4 Meter constant
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.5 Initial start-up of the meter
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.6 Test of no-load condition
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.7 Starting current test
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.8 Repeatability test
The requirements, test conditions and procedures, and acceptance criteria of
IEC 62052-11:2020 apply.
7.9 Limits of error due to variation of the current

When the meter is operated under the reference conditions given in IEC 62052-11:2020, 7.1,

the percentage errors shall not exceed the limits for the relevant accuracy class given

in Table 3.

If the meter is designed for the measurement of energy in both directions, the values

in Table 3 shall apply for each direction.

If the meter is rated for multiple connection modes, the accuracy testing results are valid only

for the connection m
...

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