SIST EN 62053-21:2004

SLOVENSKI STANDARD
01-januar-2004
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Electricity metering equipment (a.c.) - Particular requirements - Part 21: Static meters for
active energy (classes 1 and 2)
Wechselstrom-Elektrizitätszähler - Besondere Anforderungen - Teil 21: Elektronische
Wirkverbrauchszähler der Genauigkeitsklassen 1 und 2
Equipement de comptage de l'électricité (c.a.) - Prescriptions particulières - Partie 21:
Compteurs statiques d'énergie active (classes 1 et 2)
Ta slovenski standard je istoveten z: EN 62053-21:2003
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 62053-21
NORME EUROPÉENNE
EUROPÄISCHE NORM March 2003
ICS 17.220.20 Supersedes EN 61036:1996 + A1:2000

English version
Electricity metering equipment (a.c.) –
Particular requirements
Part 21: Static meters for active energy (classes 1 and 2)
(IEC 62053-21:2003)
Equipement de comptage  Wechselstrom-Elektrizitätszähler -
de l'électricité (c.a.) – Besondere Anforderungen
Prescriptions particulières Teil 21: Elektronische
Partie 21: Compteurs statiques d'énergie Wirkverbrauchszähler
active (classes 1 et 2) der Genauigkeitsklassen 1 und 2
(CEI 62053-21:2003) (IEC 62053-21:2003)

This European Standard was approved by CENELEC on 2003-03-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62053-21:2003 E
Foreword
The text of document 13/1282/FDIS, future edition 1 of IEC 62053-21, prepared by IEC TC 13,
Equipment for electrical energy measurement and load control, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 62053-21 on 2003-03-01.
This European Standard supersedes EN 61036:1996 + A1:2000.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-03-01

Annexes designated "normative" are part of the body of the standard.
In this standard, annexes A, B and ZA are normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62053-21:2003 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62053-21:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60736 1982 Testing equipment for electrical energy - -
meters
IEC 61358 1996 Acceptance inspection for direct EN 61358 1996
connected alternating current static
watt-hour meters for active energy
(classes 1 and 2)
IEC 62052-11 2003 Electricity metering equipment (AC) - EN 62052-11 2003
General requirements, tests and test
conditions
Part 11: Metering equipment
IEC 62053-61 1998 Electricity metering equipment (a.c.) EN 62053-61 1998
Particular requirements –
Part 61: Power consumption and
voltage requirements
INTERNATIONAL IEC
STANDARD
62053-21
First edition
2003-01
Electricity metering equipment (a.c.) –
Particular requirements –
Part 21:
Static meters for active energy
(classes 1 and 2)
 IEC 2003 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
PRICE CODE
S
Commission Electrotechnique Internationale
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

62053-21  IEC:2003 – 3 –
CONTENTS
FOREWORD . 7
INTRODUCTION .9
1 Scope .11
2 Normative references.11
3 Terms and definitions .13
4 Standard electrical values.13
5 Mechanical requirements .13
6 Climatic conditions.13
7 Electrical requirements .13
7.1 Power consumption .13
7.2 Influence of short-time overcurrents.15
7.3 Influence of self-heating .17
7.4 AC voltage test .17
8 Accuracy requirements .19
8.1 Limits of error due to variation of the current .19
8.2 Limits of error due to influence quantities .21
8.3 Test of starting and no-load condition .27
8.4 Meter constant.29
8.5 Accuracy test conditions .29
8.6 Interpretation of test results .31
Annex A (normative) Test circuit diagram for d.c., even harmonics, odd harmonics and
sub-harmonics .33
Annex B (normative) Electromagnet for testing the influence of externally produced
magnetic fields .45
Figure A.1 – Test circuit diagram for half-wave rectification.33
Figure A.2 – Half-wave rectified waveform .35
Figure A.3 – Informative distribution of half-wave harmonic content (the Fourier
analysis is not complete).37
Figure A.4 – Test circuit diagram (informative) .39
Figure A.5 – Phase fired waveform.41
Figure A.6 – Informative distribution of harmonic content of phase fired waveform
(the Fourier analysis is not complete).41
Figure A.7 – Burst fired waveform .43
Figure A.8 – Informative distribution of harmonics (the Fourier analysis is not complete) .43
Figure B.1 – Electromagnet for testing the influence
of externally produced magnetic fields .45
Table 1 – Power consumption in voltage circuits for single-phase and polyphase
meters including the power supply .13
Table 2 – Power consumption in current circuits.15
Table 3 – Variations due to short-time overcurrents .15
Table 4 – Variations due to self-heating .17

62053-21  IEC:2003 – 5 –
Table 5 – AC voltage tests .19
Table 6 – Percentage error limits (single-phase meters and polyphase meters with
balanced loads).19
Table 7 – Percentage error limits (polyphase meters carrying a single-phase load, but
with balanced polyphase voltages applied to voltage circuits) .21
Table 8 – Influence quantities .21
Table 9 – Starting current.27
Table 10 – Voltage and current balance .29
Table 11 – Reference conditions .29
Table 12 – Interpretation of test results .31

62053-21  IEC:2003 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ELECTRICITY METERING EQUIPMENT (AC) –
PARTICULAR REQUIREMENTS –
Part 21: Static meters for active energy (classes 1 and 2)
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. Their 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The 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: Equip-
ment for electrical energy measurement and load control.
This standard together with IEC 62052-11 cancels and replaces the second edition of
IEC 61036 (2000) and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
13/1282/FDIS 13/1289/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until 2012.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62053-21  IEC:2003 – 9 –
INTRODUCTION
This part of IEC 62053 is to be used with the following relevant parts of the IEC 62052,
IEC 62053 and IEC 62059 series, Electricity metering equipment:
IEC 62052-11:2002, Electricity metering equipment (a.c.) – General requirements, tests
and test conditions – Part 11: Metering equipment
IEC 62053-11:2003, Electricity metering equipment (a.c.) – Particular requirements – Part
11: Electromechanical meters for active energy (classes 0,5, 1 and 2)
nd
Replaces particular requirements of IEC 60521: 1988 (2 edition)
IEC 62053-22:2003, Electricity metering equipment (a.c.) – Particular requirements – Part
22: Static meters for active energy (classes 0,2 S and 0,5 S)
nd
Replaces particular requirements of IEC 60687: 1992 (2 edition)
IEC 62053-23:2003, Electricity metering equipment (a.c.) – Particular requirements –
Part 23: Static meters for reactive energy (classes 2 and 3)
st
Replaces particular requirements of IEC 61268: 1995 (1 edition)
IEC 62053-31:1998, Electricity metering equipment (a.c.) – Particular requirements – Part
31: Pulse output devices for electromechanical and electronic meters
(two wires only)
IEC 62053-61:1998, Electricity metering equipment (a.c.) – Particular requirements – Part
61: Power consumption and voltage requirements
IEC 62059-11:2002, Electricity metering equipment (a.c.) – Dependability – Part 11:
General concepts
IEC 62059-21:2002, Electricity metering equipment (a.c.) – Dependability – Part 21:
Collection of meter dependability data from the field
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).
This standard is intended to be used in conjunction with IEC 62052-11. When any requirement
in this standard concerns an item already covered in IEC 62052-11, the requirements of this
standard take precedence over the requirements of IEC 62052-11.
This standard distinguishes:
– between accuracy class index 1 and accuracy class index 2 meters;
– between protective class I and protective class II meters;
– between meters for use in networks equipped with or without earth fault neutralizers.
The test levels are regarded as minimum values that provide for the proper functioning of the
meter under normal working conditions. For special application, other test levels might be
necessary and should be agreed on between the user and the manufacturer.

62053-21  IEC:2003 – 11 –
ELECTRICITY METERING EQUIPMENT (AC) –
PARTICULAR REQUIREMENTS –
Part 21: Static meters for active energy (classes 1 and 2)
1 Scope
This part of IEC 62053 applies only to newly manufactured static watt-hour meters of
accuracy classes 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.
It applies only to static watt-hour meters for indoor and outdoor application consisting of a
measuring element and register(s) enclosed together in a meter case. It also applies to
operation indicator(s) and test output(s). If the meter has a measuring element for more than
one type of energy (multi-energy meters), or when other functional elements, like maximum
demand indicators, electronic tariff registers, time switches, ripple control receivers, data
communication interfaces, etc. are enclosed in the meter case, then the relevant standards for
these elements also apply.
It does not apply to:
– watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-
to-line voltage for meters for polyphase systems);
– portable meters;
– data interfaces to the register of the meter;
– reference meters.
Regarding acceptance tests, a basic guideline is given in IEC 61358.
The dependability aspect is covered by the standards of the IEC 62059 series.
2 Normative references
The following referenced documents are indispensable for the application 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 60736:1982, Testing equipment for electrical energy meters
IEC 61358:1996, Acceptance inspection for direct connected alternating current static watt-
hour meters for active energy (classes 1 and 2)
IEC 62052-11:2003, Electricity metering equipment (a.c.) – General requirements, tests and
test conditions – Part 11: Metering equipment
IEC 62053-61:1998, Electricity metering equipment (a.c.) – Particular requirements – Part 61:
Power consumption and voltage requirements

62053-21  IEC:2003 – 13 –
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62052-11 apply.
4 Standard electrical values
The values given in IEC 62052-11 apply.
5 Mechanical requirements
The requirements of IEC 62052-11 apply.
6 Climatic conditions
The conditions given in IEC 62052-11 apply.
7 Electrical requirements
In addition to the electrical requirements in IEC 62052-11, meters shall fulfil the following
requirements.
7.1 Power consumption
The power consumption in the voltage and current circuit shall be determined at reference
conditions given in 8.5 by any suitable method. The overall maximum error of the
measurement of the power consumption shall not exceed 5 %.
7.1.1 Voltage circuits
The active and apparent power consumption in each voltage circuit of a meter at reference
voltage, reference temperature and reference frequency shall not exceed the values shown in
Table 1.
Table 1 – Power consumption in voltage circuits for single-phase
and polyphase meters including the power supply
Power supply connected to Power supply not connected
Meters
the voltage circuits to the voltage circuits
Voltage circuit 2 W and 10 VA 0.5 VA
Auxiliary power supply – 10 VA
NOTE 1 In order to match voltage transformers to meters, the meter manufacturer should state whether the burden
is inductive or capacitive (for transformer operated meters only).
NOTE 2 The above figures are mean values. Switching power supplies with peak power values in excess of these
specified values are permitted, but it should be ensured that the rating of associated voltage transformers is
adequate.
NOTE 3 For multifunctional meters see IEC 62053-61.

62053-21  IEC:2003 – 15 –
7.1.2 Current circuits
The apparent power taken by each current circuit of a direct connected meter at basic current,
reference frequency and reference temperature shall not exceed the values shown in Table 2.
The apparent power taken by each current circuit of a meter connected through a current
transformer shall not exceed the value shown in Table 2 at a current value that equals the
rated secondary current of the corresponding transformer at reference temperature and
reference frequency of the meter.
Table 2 – Power consumption in current circuits
Class of meter
Meters
Single-phase and polyphase 4,0 VA 2,5 VA
NOTE 1 The rated secondary current is the value of the secondary current indicated on the current transformer, on
which the performance of the transformer is based. Standard values of maximum secondary current are 120 %, 150
% and 200 % of the rated secondary current.
NOTE 2 In order to match current transformers to meters, the meter manufacturer should state whether the burden
is inductive o
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