IEC 62055-31:2022
(Main)Electricity metering - Payment systems - Part 31: Particular requirements - Static payment meters for active energy (classes 0,5, 1 and 2)
Electricity metering - Payment systems - Part 31: Particular requirements - Static payment meters for active energy (classes 0,5, 1 and 2)
IEC 62055-31:2022 applies to newly manufactured, static watt-hour payment meters of accuracy classes 0,5, 1 and 2 for direct connection, for the measurement of alternating current electrical energy consumption of a frequency in the range 45 Hz to 65 Hz that include a supply control switch for the purpose of interruption or restoration of the electricity supply to the load in accordance with the current value of the available credit maintained in the payment meter. It does not apply to static watt-hour payment meters where the voltage across the connection terminals exceeds 1 000 V (line-to-line voltage for meters for polyphase systems). It applies to payment meters for indoor application, operating under normal climatic conditions where the payment meter is mounted as for normal service (i.e. together with a specified matching socket where applicable). Payment meters are implementations where all the main functional elements are incorporated in a single enclosure, together with any specified matching socket. There are also multi-device payment metering installations where the various main functional elements, such as the measuring element, the user interface unit, token carrier interface, and the supply control switch are implemented in more than one enclosure, involving additional interfaces. Functional requirements that apply to payment meters are also defined in this document, and include informative basic functional requirements and tests for the prepayment mode of operation in Annex A. Allowances are made for the relatively wide range of features, options, alternatives, and implementations that may be found in practice. The diverse nature and functionality of payment meters prevent the comprehensive specification of detailed test methods for all of these requirements. However, in this case, the requirements are stated in such a way that tests can then be formulated to respect and validate the specific functionality of the payment meter being tested. This document does not cover specific functionality or performance requirements for circuit protection, isolation or similar purposes that may be specified through reference to other specifications or standards. Safety requirements removed from Edition 1.0 have been replaced with references to the safety requirements now contained in IEC 62052-31:2015, the product safety standard for newly manufactured electricity meters. In-service safety testing (ISST) is not covered by IEC 62052-31:2015 and is left to national best practice usually as an extension of existing in-service testing (IST) of metrology stability. This document does not cover software requirements. This document covers type-testing requirements only. For acceptance testing, the requirements given in IEC 62058‑11:2008 and IEC 62058-31:2008 may be used. Dependability aspects are addressed in the IEC 62059 series of standards. Additional reliability, availability, maintenance and life cycle aspects are provided by IEC TC 56. This document does not cover conformity tests and system compliance tests that may be required in connection with legal or other requirements of some markets. This second edition cancels and replaces the first edition published in 2005. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Title modified.
b) Removal of the contents of Annex C relating to the requirements for the supply control switch, and added reference to IEC 62052-31:2015 which contains the relevant requirements.
Équipements de comptage de l'électricité - Systèmes à paiement - Partie 31: Exigences particulières - Compteurs statiques à paiement d'énergie active (classes 0,5, 1 et 2)
L'IEC 62055-31:2022 s’applique à des compteurs à paiement statiques de wattheures nouvellement fabriqués de classe de précision 0,5, 1 et 2 pour raccordement direct, pour la mesure de la consommation d’énergie électrique en courant alternatif d’une fréquence allant de 45 Hz à 65 Hz, incluant un interrupteur de commande de l’alimentation ayant pour but d'interrompre ou de rétablir la fourniture d’électricité à la charge en fonction de la valeur courante du crédit disponible maintenu dans le compteur à paiement. Elle ne s’applique pas aux compteurs à paiement statiques de wattheures dont la tension entre bornes de raccordement dépasse 1 000 V (tension entre phases pour les compteurs de systèmes polyphasés). Elle s’applique aux compteurs à paiement pour applications intérieures utilisées dans des conditions climatiques normales, là où le compteur à paiement est monté comme en service normal (c’est-à-dire avec un socle correspondant spécifié, le cas échéant). Les compteurs à paiement constituent des mises en œuvre de tous les éléments fonctionnels principaux incorporés dans une enceinte unique, avec un socle correspondant spécifié. Il existe également des installations de comptage à paiement à dispositifs multiples, dans lesquelles les divers éléments fonctionnels principaux, par exemple l’élément de mesure, l’unité d’interface utilisateur, l’interface de support de jeton et l’interrupteur de commande de l’alimentation, sont mis en œuvre dans plusieurs enceintes, ce qui implique des interfaces supplémentaires. Les exigences fonctionnelles qui s’appliquent aux compteurs à paiement sont également définies dans le présent document, et comprennent des exigences fonctionnelles informatives de base et des essais pour le mode de fonctionnement par prépaiement de l’Annexe A. Des marges sont prévues pour le domaine relativement large de caractéristiques, options, aides actives et mises en œuvre qui peuvent exister en pratique. La nature et les fonctionnalités diverses des compteurs à paiement empêchent une spécification exhaustive de méthodes d’essai détaillées pour toutes ces exigences. Dans ce cas toutefois, les exigences sont mentionnées de telle manière que des essais puissent ensuite être formulés pour respecter et valider la fonctionnalité spécifique du compteur à paiement soumis à essai. Le présent document ne traite pas de la fonctionnalité spécifique ou des exigences de performance concernant la protection des circuits, l’isolation ou des objectifs similaires qui peuvent être spécifiés en référence à d’autres spécifications ou normes. Les exigences de sécurité supprimées de l’Edition 1.0 ont été remplacées par des références aux exigences de sécurité, qui se trouvent à présent dans l’IEC 62052-31:2015, qui est la norme de sécurité produit des compteurs électriques nouvellement fabriqués. Les essais de sécurité en service (in-service safety testing – ISST) ne sont pas couverts par l’IEC 62052-31:2015 et cèdent la place aux meilleures pratiques du pays, habituellement comme extension des essais en service (in-service testing – IST) existants concernant la stabilité métrologique. Le présent document ne traite pas des exigences logicielles. Le présent document traite uniquement des exigences d’essai de type. Pour les essais d’acceptation, les exigences données dans l’IEC 62058-11:2008 et l’IEC 62058-31:2008 peuvent être utilisées. Les aspects de sûreté sont traités dans la série de normes IEC 62059. Les aspects supplémentaires relatifs à la fiabilité, la disponibilité, la maintenance et la durée de vie sont donnés par l’IEC TC 56. Le présent document ne traite pas des essais de conformité ni des essais de conformité du système qui peuvent être exigés en relation avec des exigences légales ou autres sur certains marchés. Cette seconde édition annule et remplace la première édition parue en 2005. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition
General Information
Relations
Standards Content (Sample)
IEC 62055-31 ®
Edition 2.0 2022-06
COMMENTED VERSION
INTERNATIONAL
STANDARD
Electricity metering – Payment systems –
Part 31: Particular requirements – Static payment meters for active energy
(classes 0,5, 1 and 2)
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 62055-31 ®
Edition 2.0 2022-06
COMMENTED VERSION
INTERNATIONAL
STANDARD
Electricity metering – Payment systems –
Part 31: Particular requirements – Static payment meters for active energy
(classes 0,5, 1 and 2)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 91.140.50 ISBN 978-2-8322-3940-7
– 2 – IEC 62055-31:2022 CMV © IEC 2022
CONTENTS
FOREWORD .5
INTRODUCTION .7
1 Scope .8
2 Normative references .9
3 Terms and definitions . 10
3.1 General payment metering . 10
3.2 Tokens . 12
3.3 Token carriers . 13
3.4 Tokens and token carriers . 14
3.5 Definitions related to load switching .
3.5 Switches of metering equipment . 16
3.6 Timekeeping and tariff control . 16
4 Standard Nominal electrical values . 17
5 Mechanical Construction requirements. 18
5.1 General . 18
5.2 General mechanical requirements .
5.3 Case .
5.4 Window .
5.5 Terminals .
5.6 Terminal covers .
5.2 Clearance and creepage distances . 18
5.8 Insulating-encased meter of protective class II .
5.9 Resistance to heat and fire .
5.3 Protection against penetration of dust and water. 18
5.11 Display and indicators .
5.4 Display of measured values . 19
5.4.1 General . 19
5.4.2 Minimum display capability . 19
5.4.3 Indicators . 20
5.5 Storage of measured values . 20
5.6 Output device . 20
5.7 Marking of the meter . 20
5.8 Token carrier interface . 21
5.8.1 General . 21
5.8.2 Token carrier acceptor . 21
5.8.3 Keypad interface . 21
6 Climatic requirements conditions . 21
6.1 General . 21
6.2 Temperature range . 21
6.2.1 General . 21
6.2.2 Operation within the specified operating range . 21
6.2.3 Operation within the limit range of operation . 22
6.2.4 Storage and transport outside the limit range of operation . 22
6.3 Relative humidity . 23
6.4 Protection against penetration of dust and water. 23
6.5 Tests of the effect of the climatic environments . 23
7 Electrical requirements . 23
7.1 General requirements . 23
7.2 Influence of supply voltage. 24
7.2.1 Voltage range(s) . 24
7.2.2 Voltage dips and short interruptions . 25
7.2.3 Abnormal voltage conditions . 26
7.4 Influence of short-time overcurrents .
7.5 Influence of heating .
7.3 Heating . 27
7.4 Insulation . 27
7.5 Long Term Over Voltage Withstand . 27
7.6 Electromagnetic compatibility (EMC) . 27
7.6.1 General . 27
7.6.2 General test conditions . 27
7.6.3 Test of immunity to electrostatic discharges . 28
7.6.4 Test of immunity to radiated RF electromagnetic fields . 28
7.6.5 Test of immunity to electrical fast transients/bursts . 28
7.6.6 Test of immunity to conducted disturbances, induced by RF fields . 28
7.6.7 Surge immunity test . 29
7.6.8 Test of immunity to damped oscillatory waves test . 29
7.6.9 Radio interference suppression . 29
7.9 Load switching .
7.7 Power consumption . 31
7.7.1 General . 31
7.7.2 Voltage circuits . 31
7.7.3 Current circuits . 31
7.8 Influence of self-heating on accuracy . 31
7.9 Electrical tests on supply control and load control switches (SCS and LCS) . 31
7.10 Auxiliary output control switches (ACS) . 31
7.11 Token carrier acceptor interface test . 32
8 Metering Accuracy requirements . 32
9 Functional requirements . 32
9.1 General . 32
9.2 Robustness of meter accounting process. 32
10 Type test . 34
Annex A (informative) Functional performance . 35
A.1 Basic functionalities – prepayment mode . 35
A.1.1 General . 35
A.1.2 Prepayment mode – core functionalities . 35
A.1.3 Core functional tests within voltage and temperature range limits . 38
A.1.4 Functional tests within the limit range of operation with voltage . 39
A.1.5 Functional tests within the limit range of operation with temperature . 39
A.1.6 Prepayment mode – token handling and data integrity requirements. 40
A.2 Additional functionalities . 41
A.2.1 General . 41
A.2.2 Requirements for other modes of operation . 42
A.2.3 Collection of agreed debt . 42
A.2.4 Time-of-use tariff facilities. 42
– 4 – IEC 62055-31:2022 CMV © IEC 2022
A.3 System compliance requirements . 43
Annex B (informative) Reference model for a payment meter . 44
B.1 General . 44
B.2 Generalised payment meter instance . 45
B.3 Functions in a single-part payment meter . 48
B.3.1 General . 48
B.3.2 Meter application process . 48
B.3.3 Token_Carrier_to_Meter_Interface function . 48
B.3.4 Accounting function . 48
B.3.5 Metering function . 48
B.3.6 Delivery function. 49
B.3.7 Time functions . 49
B.3.8 Test functions . 49
B.3.9 Display functions . 49
B.3.10 Recording functions . 50
B.3.11 Security functions . 50
Annex C (normative) Performance requirements for payment meters with load
switching utilisation categories UC2, UC3 and UC4 .
Annex C (normative) Requirements for payment meters with supply control switches . 60
Annex D (normative) Requirements of timekeeping . 61
D.1 General . 61
D.1.1 General . 61
D.1.2 Real-time clock support facilities . 61
D.1.3 Operation reserve . 61
D.1.4 Primary batteries . 62
D.1.5 Back up battery replacement . 62
D.1.6 Real-time clock setting and synchronisation facilities . 62
D.2 Synchronous clocks . 62
D.3 Crystal-controlled clocks . 62
D.4 Tests of timekeeping accuracy . 63
D.4.1 General . 63
D.4.2 General test conditions . 63
D.4.3 Test of synchronous clocks in payment meters . 63
D.4.4 Test of crystal-controlled clocks in payment meters . 63
D.5 Effects of disturbances on timekeeping . 64
D.5.1 General . 64
D.5.2 Electromagnetic disturbances . 64
D.5.3 Voltage dips and short interruptions . 65
D.5.4 Harmonics in the voltage waveform . 66
Bibliography . 67
List of comments . 68
Figure B.1 – Generalised block diagram of a payment meter instance . 46
Table 1 – Voltage ranges . 24
Table C.1 – Summary of test currents for UC2, UC3 and UC4.
Table C.2 – Test sequence and sample plan .
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING – PAYMENT SYSTEMS –
Part 31: Particular requirements –
Static payment meters for active energy (classes 0,5 1, 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,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
This commented version (CMV) of the official standard IEC 62055-31:2022 edition 2.0
allows the user to identify the changes made to the previous IEC 62055-31:2005 edition
1.0. Furthermore, comments from IEC TC 13 experts are provided to explain the reasons
of the most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.
– 6 – IEC 62055-31:2022 CMV © IEC 2022
IEC 62055-31 has been prepared by IEC technical committee 13: Electrical energy
measurement and control. It is an International Standard.
This second edition cancels and replaces the first edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Title modified.
b) Removal of the contents of Annex C relating to the requirements for the supply control
switch, and added reference to IEC 62052-31:2015 which contains the relevant
requirements.
The text of this International Standard is based on the following documents:
Draft Report on voting
13/1864/FDIS 13/1866/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 62055 series, published under the general title Electricity metering
– Payment systems, 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 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.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
INTRODUCTION
Payment meters are used in situations where the supply of electrical energy to the load may be
interrupted or its restoration enabled under the control of the payment meter in relation to a
payment tariff agreed between the customer and the supplier. The payment meter is part of a
system that uses token carriers to pass payment information as tokens between a vending
network and the payment meters that include the meter accounting process.
The primary reason for this edition is to align it with the requirements introduced in
IEC 62052‑31:2015 metering safety standard. 2
The functions of a payment meter are to measure electrical energy consumed and to decrement
the available credit value in accordance with the metered consumption, and possibly in
accordance with the passing of time. This available credit value is incremented as the result of
payments made to the electricity supplier, and the meter accounting process continuously
calculates the balance of available credit held by the customer. When the available credit value
has been decremented to a predetermined value that is related to the payment mode in use, a
switch is used to interrupt the supply to the customer’s load. However, additional features may
be present in the payment meter, which prevent or delay the opening of the switch, or limit
further consumption to a low load level. Such “social” features may include the provision of an
emergency credit facility, the possibility of operation in a fixed-payment mode, and the inhibiting
of interruptions for certain periods of time.
In return for the payment (usually in cash) and depending on the particular type of system, the
customer may be issued with a single-use token on a disposable token carrier for the equivalent
value, or a reusable token carrier may be credited with that value, or the token may be
transmitted directly to the meter via a communications network (a so-called virtual token
carrier). “One-way” and “two-way” data transfer systems may be used, and the token carriers
may be: physical devices such as smart cards, or other electronic devices, or magnetic cards;
virtual token carriers where the token information is transferred by a remote communications
system; or numeric token carriers where sequences of digits are issued on a paper receipt and
entered via a keypad on the meter.
IEC 62051:1999, Clause 17 provides some details of payment metering terminology.
– 8 – IEC 62055-31:2022 CMV © IEC 2022
ELECTRICITY METERING – PAYMENT SYSTEMS –
Part 31: Particular requirements –
Static payment meters for active energy (classes 0,5, 1 and 2)
1 Scope
This part of IEC 62055 applies to newly manufactured, static watt-hour payment meters of
accuracy classes 0,5, 1 and 2 for direct connection, for the measurement of alternating current
electrical energy consumption of a frequency in the range 45 Hz to 65 Hz that include a load
supply control 3 switch for the purpose of interruption or restoration of the electricity supply to
the load in accordance with the current value of the available credit maintained in the payment
meter. It does not apply to static watt-hour payment meters where the voltage across the
connection terminals exceeds 600 1 000 V 4 (line-to-line voltage for meters for polyphase
systems).
It applies to payment meters for indoor application only, operating under normal climatic
conditions 5 where the payment meter shall be is mounted as for normal service (i.e. together
with a specified matching socket where applicable).
Payment meters are implementations where all the main functional elements are incorporated
in a single enclosure, together with any specified matching socket. There are also multi-part
multi-device 6 payment metering installations where the various main functional elements, such
as the measuring element, the user interface unit, token carrier interface, and the load supply
control switch are implemented in more than one enclosure, involving additional interfaces. This
part of IEC 62055 does not apply to multi-part payment metering installations.
Functional requirements that apply to payment meters are also defined in this document, and
include informative basic functional requirements and tests for the prepayment mode of
operation in Annex A. Allowances are made for the relatively wide range of features, options,
alternatives, and implementations that may be found in practice. The diverse nature and
functionality of payment meters prevent the comprehensive specification of detailed test
methods for all of these requirements. However, in this case, the requirements are stated in
such a way that tests can then be formulated to respect and validate the specific functionality
of the payment meter being tested.
This document does not cover specific functionality or performance requirements for safety,
circuit protection, isolation or similar purposes that may be specified through reference to other
specifications or standards. Safety requirements removed from Edition 1.0 have been replaced
with references to the safety requirements now contained in IEC 62052-31:2015, the product
safety standard for newly manufactured electricity meters. In-service safety testing (ISST) is
not covered by IEC 62052-31:2015 and is left to national best practice usually as an extension
of existing in-service testing (IST) of metrology stability.
This document does not cover software requirements. Software requirements for basic energy
meter metrology are under consideration for the IEC 62059 series of standards, and in other
organisations.
This document covers type-testing requirements only. For acceptance testing, the concepts
requirements given in IEC 61358 IEC 62058‑11:2008 and IEC 62058-31:2008 may be used as
a basic guideline.
Dependability aspects are addressed in the IEC 62059 series of standards. Additional reliability,
availability, maintenance and life cycle aspects are provided by IEC TC 56.
This document does not cover conformity tests and system compliance tests that may be
required in connection with legal or other requirements of some markets.
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 60050-300:2001, International Electrotechnical Vocabulary (IEV) – Part 300: Electrical and
electronic measurements and measuring instruments – Part 311: General terms relating to
measurements – Part 312: General terms relating to electrical measurements – Part 313: Types
of electrical measuring instruments – Part 314: Specific terms according to the type of
instrument
IEC 60050-300:2001/AMD1:2015
IEC 60050-300:2001/AMD2:2016
IEC 60050-300:2001/AMD3:2017
IEC 60050-300:2001/AMD4:2020
IEC 61000-4-5:1995, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
Amendment 1 (2002)
IEC 61358:1996, Acceptance inspection for direct-connected alternating current static watt-
hour meters for active energy (classes 1 and 2)
IEC TR 62051:1999, Electricity metering – Glossary of terms
IEC 62052-11:20032020, Electricity metering equipment (AC) – 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 7
IEC 62053-21:20032020, Electricity metering equipment (AC) – Particular requirements – Part
21: Static meters for AC active energy (classes 0,5, 1 and 2)
IEC 62054-21:2004, Electricity metering (a.c.) – Tariff and load control – Part 21: Particular
requirements for time switches
IEC 62054-21:2004/AMD1:2017
IEC TR 62055-21:2005, Electricity metering – Payment systems – Part 21: Framework for
standardisation
IEC 62058-11:2008, Electricity metering equipment (AC) – Acceptance inspection – Part 11:
General acceptance inspection methods
tricity metering equipment (AC) – Acceptance inspection – Part 31:
IEC 62058-31:2008, Elec
Particular requirements for static meters for active energy (classes 0,2 S, 0,5 S, 1 and 2)
– 10 – IEC 62055-31:2022 CMV © IEC 2022
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050‑300:2001,
IEC 62051:1999, IEC 62052-11:2020, and IEC 62055-21:2005, as well as the following, apply.
NOTE Where there is a difference between definitions in IEC 62055-31 and those contained in other referenced
IEC standards, then those defined in IEC 62055-31 shall take precedence.
NOTE Some of these definitions cancel and replace those for the same term in IEC 62051, including some terms in
Clause 17 of that standard.
3.1 General payment metering
3.1.1
AC withstand voltage
RMS value of sinusoidal power frequency voltage that the equipment can withstand during tests
made under specified conditions and for a specified time
[SOURCE: IEC 60050:1987, 604-03-40 IEC 60050-614:2016, 614-03-22, modified]
3.1.2
available credit value
value of available credit (in monetary or energy units) usable for further consumption that is
either stored in the payment meter or calculated by it whenever required which includes social
credit if implemented
3.1.3
fault current
current flowing at a given point of a network resulting from a fault at another point of this network
[SOURCE: IEC 60050-603:1986, 603-02-25]
3.1.4
load control switch 8
LCS
SEE: IEC 62052-31:2015, 3.7.3
3.1.5
load interface
terminal(s) where the customer’s load circuit is connected to the payment meter, or to a
specified matching socket, where applicable
3.1.6
multi-part multi-device 9 payment metering installation
payment metering installation where the functional elements comprising the measuring
element(s); register(s), storage, and control; meter accounting process; user interface including
any physical token carrier interface; any virtual token carrier interface; load switch(es);
auxiliaries; plus supply interface and load interface are not arranged in the form of a payment
meter, but instead are partitioned into two or more units devices that require appropriate
mounting, connection, and commissioning
[SOURCE: IEC 62051:1999, 17.45, modified]
3.1.7
payment meter
electricity meter with additional functionality that can be operated and controlled to allow the
flow of energy according to agreed payment modes
Note 1 to entry: It includes the following functional elements: measuring element(s); register(s), storage, and
control; meter accounting process and any time-based functions; user interface including any physical token carrier
interface; any virtual token carrier interface; load switch(es); auxiliaries; plus supply interface and load interface. A
payment meter takes the form of a single unit, or a main unit that also employs a single specified matching socket
for the supply interface and load interface. In either case. some payment meter implementations may allow for some
or all of any time-based functions to be provided by an external unit connected to the payment meter, such as a time
switch, a ripple control receiver, or a radio receiver.
Note 2 to entry: Refer to Figure B.1 for the generalised block diagram of a payment meter instance.
[SOURCE: IEC 62051:1999, 17.47, modified]
3.1.8
payment metering installation
set of payment metering equipment installed and ready for use at a customer’s premises
Note 1 to entry: This includes mounting the equipment as appropriate, and where a multi-part multi-device payment
metering installation is involved, the connection of each unit of equipment as appropriate. It also includes the
connection of the supply network to the supply interface, the connection of the customer’s load circuit to the load
interface, and the commissioning of the equipment into an operational state as a payment metering installation.
3.1.9
prepayment mode
payment mode in which automatic interruption occurs when available credit value is exhausted
3.1.10
social credit
amount of additional credit for which the consumer has not paid in advance but shall be repaid
or a period of time within which supply will not be interrupted despite credit exhaustion
3.1.11
specified matching socket
comprises a base with jaws to accept and connect to the plug-in unit, terminals for connection
of the supply network and the consumer load circuit, and appropriate secure fixing and sealing
arrangements
Note 1 to entry: The payment meter is capable of meeting the relevant type-testing requirements when it is properly
installed in any specified matching socket.
3.1.12
supply control switch 10
SCS
SEE: IEC 62052-31:2015, 3.7.2
3.1.13
supply interface
terminal(s) where the supply network is connected to a payment meter, or to a specified
matching socket, where applicable
3.1.14
time-based credit
payment meter accounting functions that deal with the calculation and transacting of a (social)
grant of credit that is released on a scheduled time basis
Note 1 to entry: See IEC 62055-21:2005, 13.8.3.
3.1.15
user interface
that part of a payment meter or payment metering installation that allows the customer to
monitor and operate the installation
Note 1 to entry: It may also facilitate meter reading and inspection, and metering services activities.
– 12 – IEC 62055-31:2022 CMV © IEC 2022
Note 2 to entry: Where physical token carriers are employed, it includes a token carrier interface.
3.2 Tokens
3.2.1
token
information content including an instruction issued on a token
carrier by a vending or management system that is capable of subsequent transfer to and
acceptance by a specific payment meter, or one of a group of meters, with appropriate security
Note 1 to entry: In a more general sense, the token refers to the instruction and information being transferred, while
the token carrier refers to the physical device being used to carry the instruction and information, or to the
communications medium in the case of a virtual token carrier.
[SOURCE: IEC 62051:1999, 17.66]
subset of data elements, containing an instruction and information,
that is present in the APDU of the application layer of the POS to Token Carrier Interface, and
which is also transferred to the payment meter by means of a token carrier
3.2.2
credit token
value token
token that represents an amount of credit in monetary or energy value for transfer from the
vending point to the payment meter
3.2.3
duplicate token
token that contains the same information as a token that has already been issued, and hence
may also be a valid token
Note 1 to entry: This is not the same as a replacement token (refer also to 3.4.9).
Note 2 to entry: A duplicate token is a reissue of the same token that was previously issued and is identical to it in
all aspects; whereas a replacement token is a newly generated token in place of a previously generated token and
may not be identical to it in all aspects.
3.2.4
multiple-use token
token (such as a test token) that can be used for more than one successful session in a payment
meter or possibly with each in a group of meters
Note 1 to entry: These are typically used for meter reading or service purposes on repeated occasions.
3.2.5
no-value token
token that does not result in a financial advantage or disadvantage to the consumer, which may
contain meter configuration data, or instructions to perform certain tests, or to display certain
values on the user interface, or to retrieve certain data from the meter and return it on a token
carrier
Note 1 to entry: This is as opposed to value token.
3.2.6
replacement token
SEE: 3.4.9
Note 1 to entry: This is not the same as a duplicate token (see 3.2.3).
3.2.7
single-use token
token (such as a credit token) that can only be used for one successful session in a payment
meter
3.2.8
valid token
, token that is capable
of being processed successfully by the meter(s)
3.2.9
value token
SEE credit token 3.2.2
3.3 Token carriers
3.3.1
token carrier
devices or media used to transport and present token
information to payment meters, such as printed paper, magnetic card, electronic memory
card/key, microprocessor card, or data communications networks
Note 1 to entry: The token carrier may also carry ancillary control or monitoring information to or from the payment
meter, depending upon system type and requirements.
medium that is used in the physical layer of the POS to Token
Carrier Interface, onto which the token is modulated or encoded, and which serves to carry the
token from the point where it is generated to the remote payment meter, where it is received
3.3.2
blank token carrier
physical token carrier that has not been processed at the vending point or elsewhere and hence
contains no specific data
3.3.3
disposable token carrier
token carrier that is not capable of further use once it has been accepted or used, such as a
paper-based magnetic card
3.3.4
machine-readable token carrier
physical or virtual token carrier carrying token information that is capable of being read and
processed automatically on presentation to an appropriate payment meter, without further
manual operation
EXAMPLE A token employing a magnetic card as the token carrier.
3.3.5
memory token carrier
physical token carrier containing a non-volatile memory device, in which the token is
electronically encoded and stored while it is being transported
3.3.6
microprocessor token carrier
physical token carrier containing a microprocessor device with non-volatil
...
IEC 62055-31 ®
Edition 2.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering – Payment systems –
Part 31: Particular requirements – Static payment meters for active energy
(classes 0,5, 1 and 2)
Équipements de comptage de l’électricité – Systèmes à paiement –
Partie 31: Exigences particulières – Compteurs statiques à paiement d’énergie
active (classes 0,5, 1 et 2)
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always
committee, …). It also gives information on projects, replaced have access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 300 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
19 langues additionnelles. Egalement appelé Vocabulaire
Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 62055-31 ®
Edition 2.0 2022-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electricity metering – Payment systems –
Part 31: Particular requirements – Static payment meters for active energy
(classes 0,5, 1 and 2)
Équipements de comptage de l’électricité – Systèmes à paiement –
Partie 31: Exigences particulières – Compteurs statiques à paiement d’énergie
active (classes 0,5, 1 et 2)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140.50 ISBN 978-2-8322-3803-5
– 2 – IEC 62055-31:2022 © IEC 2022
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
3.1 General payment metering . 9
3.2 Tokens . 11
3.3 Token carriers . 12
3.4 Tokens and token carriers . 14
3.5 Switches of metering equipment . 15
3.6 Timekeeping and tariff control . 15
4 Nominal electrical values . 17
5 Construction requirements . 17
5.1 General . 17
5.2 Clearance and creepage distances . 17
5.3 Protection against penetration of dust and water . 17
5.4 Display of measured values . 17
5.4.1 General . 17
5.4.2 Minimum display capability . 17
5.4.3 Indicators . 18
5.5 Storage of measured values . 18
5.6 Output device . 18
5.7 Marking of the meter . 18
5.8 Token carrier interface . 19
5.8.1 General . 19
5.8.2 Token carrier acceptor . 19
5.8.3 Keypad interface. 19
6 Climatic conditions . 19
6.1 General . 19
6.2 Temperature range . 19
6.2.1 General . 19
6.2.2 Operation within the specified operating range . 19
6.2.3 Operation within the limit range of operation . 20
6.2.4 Storage and transport outside the limit range of operation . 20
6.3 Relative humidity . 20
6.4 Protection against penetration of dust and water . 21
6.5 Tests of the effect of the climatic environments . 21
7 Electrical requirements . 21
7.1 General requirements . 21
7.2 Influence of supply voltage. 21
7.2.1 Voltage range(s) . 21
7.2.2 Voltage dips and short interruptions . 22
7.2.3 Abnormal voltage conditions . 23
7.3 Heating . 23
7.4 Insulation . 23
7.5 Long Term Over Voltage Withstand . 24
7.6 Electromagnetic compatibility (EMC) . 24
7.6.1 General . 24
7.6.2 General test conditions . 24
7.6.3 Test of immunity to electrostatic discharges. 24
7.6.4 Test of immunity to radiated RF electromagnetic fields . 24
7.6.5 Test of immunity to electrical fast transients/bursts . 25
7.6.6 Test of immunity to conducted disturbances, induced by RF fields . 25
7.6.7 Surge immunity test . 25
7.6.8 Test of immunity to damped oscillatory waves . 25
7.6.9 Radio interference suppression . 25
7.7 Power consumption . 25
7.7.1 General . 25
7.7.2 Voltage circuits . 26
7.7.3 Current circuits . 26
7.8 Influence of self-heating on accuracy . 26
7.9 Electrical tests on supply control and load control switches (SCS and LCS) . 26
7.10 Auxiliary control switches (ACS) . 26
7.11 Token carrier acceptor interface test . 26
8 Accuracy requirements . 26
9 Functional requirements . 27
9.1 General . 27
9.2 Robustness of meter accounting process . 27
10 Type test . 28
Annex A (informative) Functional performance . 30
A.1 Basic functionalities – prepayment mode . 30
A.1.1 General . 30
A.1.2 Prepayment mode – core functionalities . 30
A.1.3 Core functional tests within voltage and temperature range limits . 33
A.1.4 Functional tests within the limit range of operation with voltage . 34
A.1.5 Functional tests within the limit range of operation with temperature . 34
A.1.6 Prepayment mode – token handling and data integrity requirements . 35
A.2 Additional functionalities . 36
A.2.1 General . 36
A.2.2 Requirements for other modes of operation . 37
A.2.3 Collection of agreed debt . 37
A.2.4 Time-of-use tariff facilities . 37
A.3 System compliance requirements . 38
Annex B (informative) Reference model for a payment meter . 39
B.1 General . 39
B.2 Generalised payment meter instance . 40
B.3 Functions in a single-part payment meter . 42
B.3.1 General . 42
B.3.2 Meter application process . 42
B.3.3 Token_Carrier_to_Meter_Interface function . 42
B.3.4 Accounting function . 42
B.3.5 Metering function . 42
B.3.6 Delivery function . 43
– 4 – IEC 62055-31:2022 © IEC 2022
B.3.7 Time functions . 43
B.3.8 Test functions . 43
B.3.9 Display functions . 43
B.3.10 Recording functions . 44
B.3.11 Security functions . 44
Annex C (normative) Requirements for payment meters with supply control switches . 46
Annex D (normative) Requirements of timekeeping . 47
D.1 General . 47
D.1.1 General . 47
D.1.2 Real-time clock support facilities. 47
D.1.3 Operation reserve . 47
D.1.4 Primary batteries . 48
D.1.5 Back up battery replacement . 48
D.1.6 Real-time clock setting and synchronisation facilities . 48
D.2 Synchronous clocks . 48
D.3 Crystal-controlled clocks . 48
D.4 Tests of timekeeping accuracy . 49
D.4.1 General . 49
D.4.2 General test conditions . 49
D.4.3 Test of synchronous clocks in payment meters . 49
D.4.4 Test of crystal-controlled clocks in payment meters . 49
D.5 Effects of disturbances on timekeeping . 50
D.5.1 General . 50
D.5.2 Electromagnetic disturbances . 50
D.5.3 Voltage dips and short interruptions . 51
D.5.4 Harmonics in the voltage waveform . 52
Bibliography . 53
Figure B.1 – Generalised block diagram of a payment meter instance . 40
Table 1 – Voltage ranges . 21
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING – PAYMENT SYSTEMS –
Part 31: Particular requirements –
Static payment meters for 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,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). 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. 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
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
IEC 62055-31 has been prepared by IEC technical committee 13: Electrical energy
measurement and control. It is an International Standard.
This second edition cancels and replaces the first edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Title modified.
b) Removal of the contents of Annex C relating to the requirements for the supply control
switch, and added reference to IEC 62052-31:2015 which contains the relevant
requirements.
– 6 – IEC 62055-31:2022 © IEC 2022
The text of this International Standard is based on the following documents:
Draft Report on voting
13/1864/FDIS 13/1866/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 62055 series, published under the general title Electricity metering
– Payment systems, 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 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.
INTRODUCTION
Payment meters are used in situations where the supply of electrical energy to the load may be
interrupted or its restoration enabled under the control of the payment meter in relation to a
payment tariff agreed between the customer and the supplier. The payment meter is part of a
system that uses token carriers to pass payment information as tokens between a vending
network and the payment meters that include the meter accounting process.
The primary reason for this edition is to align it with the requirements introduced in
IEC 62052‑31:2015 metering safety standard.
The functions of a payment meter are to measure electrical energy consumed and to decrement
the available credit value in accordance with the metered consumption, and possibly in
accordance with the passing of time. This available credit value is incremented as the result of
payments made to the electricity supplier, and the meter accounting process continuously
calculates the balance of available credit held by the customer. When the available credit value
has been decremented to a predetermined value that is related to the payment mode in use, a
switch is used to interrupt the supply to the customer’s load. However, additional features may
be present in the payment meter, which prevent or delay the opening of the switch, or limit
further consumption to a low load level. Such “social” features may include the provision of an
emergency credit facility, the possibility of operation in a fixed-payment mode, and the inhibiting
of interruptions for certain periods of time.
In return for the payment (usually in cash) and depending on the particular type of system, the
customer may be issued with a single-use token on a disposable token carrier for the equivalent
value, or a reusable token carrier may be credited with that value, or the token may be
transmitted directly to the meter via a communications network (a so-called virtual token
carrier). “One-way” and “two-way” data transfer systems may be used, and the token carriers
may be: physical devices such as smart cards, or other electronic devices, or magnetic cards;
virtual token carriers where the token information is transferred by a remote communications
system; or numeric token carriers where sequences of digits are issued on a paper receipt and
entered via a keypad on the meter.
IEC 62051:1999, Clause 17 provides some details of payment metering terminology.
– 8 – IEC 62055-31:2022 © IEC 2022
ELECTRICITY METERING – PAYMENT SYSTEMS –
Part 31: Particular requirements –
Static payment meters for active energy (classes 0,5, 1 and 2)
1 Scope
This part of IEC 62055 applies to newly manufactured, static watt-hour payment meters of
accuracy classes 0,5, 1 and 2 for direct connection, for the measurement of alternating current
electrical energy consumption of a frequency in the range 45 Hz to 65 Hz that include a supply
control switch for the purpose of interruption or restoration of the electricity supply to the load
in accordance with the current value of the available credit maintained in the payment meter. It
does not apply to static watt-hour payment meters where the voltage across the connection
terminals exceeds 1 000 V (line-to-line voltage for meters for polyphase systems).
It applies to payment meters for indoor application, operating under normal climatic conditions
where the payment meter is mounted as for normal service (i.e. together with a specified
matching socket where applicable).
Payment meters are implementations where all the main functional elements are incorporated
in a single enclosure, together with any specified matching socket. There are also multi-device
payment metering installations where the various main functional elements, such as the
measuring element, the user interface unit, token carrier interface, and the supply control switch
are implemented in more than one enclosure, involving additional interfaces.
Functional requirements that apply to payment meters are also defined in this document, and
include informative basic functional requirements and tests for the prepayment mode of
operation in Annex A. Allowances are made for the relatively wide range of features, options,
alternatives, and implementations that may be found in practice. The diverse nature and
functionality of payment meters prevent the comprehensive specification of detailed test
methods for all of these requirements. However, in this case, the requirements are stated in
such a way that tests can then be formulated to respect and validate the specific functionality
of the payment meter being tested.
This document does not cover specific functionality or performance requirements for circuit
protection, isolation or similar purposes that may be specified through reference to other
specifications or standards. Safety requirements removed from Edition 1.0 have been replaced
with references to the safety requirements now contained in IEC 62052-31:2015, the product
safety standard for newly manufactured electricity meters. In-service safety testing (ISST) is
not covered by IEC 62052-31:2015 and is left to national best practice usually as an extension
of existing in-service testing (IST) of metrology stability.
This document does not cover software requirements. This document covers type-testing
requirements only. For acceptance testing, the requirements given in IEC 62058‑11:2008 and
IEC 62058-31:2008 may be used.
Dependability aspects are addressed in the IEC 62059 series of standards. Additional reliability,
availability, maintenance and life cycle aspects are provided by IEC TC 56.
This document does not cover conformity tests and system compliance tests that may be
required in connection with legal or other requirements of some markets.
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 60050-300:2001, International Electrotechnical Vocabulary (IEV) – Part 300: Electrical and
electronic measurements and measuring instruments – Part 311: General terms relating to
measurements – Part 312: General terms relating to electrical measurements – Part 313: Types
of electrical measuring instruments – Part 314: Specific terms according to the type of
instrument
IEC 60050-300:2001/AMD1:2015
IEC 60050-300:2001/AMD2:2016
IEC 60050-300:2001/AMD3:2017
IEC 60050-300:2001/AMD4:2020
IEC TR 62051:1999, Electricity metering – Glossary of terms
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 62053-21:2020, Electricity metering equipment – Particular requirements – Part 21: Static
meters for AC active energy (classes 0,5, 1 and 2)
IEC 62054-21:2004, Electricity metering (a.c.) – Tariff and load control – Part 21: Particular
requirements for time switches
IEC 62054-21:2004/AMD1:2017
IEC TR 62055-21:2005, Electricity metering – Payment systems – Part 21: Framework for
standardisation
IEC 62058-11:2008, Electricity metering equipment (AC) – Acceptance inspection – Part 11:
General acceptance inspection methods
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)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050‑300:2001,
IEC 62051:1999, IEC 62052-11:2020, and IEC 62055-21:2005, as well as the following, apply.
NOTE Where there is a difference between definitions in IEC 62055-31 and those contained in other referenced
IEC standards, then those defined in IEC 62055-31 take precedence.
3.1 General payment metering
3.1.1
AC withstand voltage
RMS value of sinusoidal power frequency voltage that the equipment can withstand during tests
made under specified conditions and for a specified time
[SOURCE: IEC 60050-614:2016, 614-03-22, modified]
– 10 – IEC 62055-31:2022 © IEC 2022
3.1.2
available credit value
value of available credit (in monetary or energy units) usable for further consumption that is
either stored in the payment meter or calculated by it whenever required which includes social
credit if implemented
3.1.3
fault current
current flowing at a given point of a network resulting from a fault at another point of this network
[SOURCE: IEC 60050-603:1986, 603-02-25]
3.1.4
load control switch
LCS
SEE: IEC 62052-31:2015, 3.7.3
3.1.5
load interface
terminal(s) where the customer’s load circuit is connected to the payment meter, or to a
specified matching socket, where applicable
3.1.6
multi-device payment metering installation
payment metering installation where the functional elements comprising the measuring
element(s); register(s), storage, and control; meter accounting process; user interface including
any physical token carrier interface; any virtual token carrier interface; load switch(es);
auxiliaries; plus supply interface and load interface are not arranged in the form of a payment
meter, but instead are partitioned into two or more devices that require appropriate mounting,
connection, and commissioning
[SOURCE: IEC 62051:1999, 17.45]
3.1.7
payment meter
electricity meter with additional functionality that can be operated and controlled to allow the
flow of energy according to agreed payment modes
Note 1 to entry: It includes the following functional elements: measuring element(s); register(s), storage, and
control; meter accounting process and any time-based functions; user interface including any physical token carrier
interface; any virtual token carrier interface; load switch(es); auxiliaries; plus supply interface and load interface. A
payment meter takes the form of a single unit, or a main unit that also employs a single specified matching socket
for the supply interface and load interface. In either case. some payment meter implementations may allow for some
or all of any time-based functions to be provided by an external unit connected to the payment meter, such as a time
switch, a ripple control receiver, or a radio receiver.
Note 2 to entry: Refer to Figure B.1 for the generalised block diagram of a payment meter instance.
[SOURCE: IEC 62051:1999, 17.47]
3.1.8
payment metering installation
set of payment metering equipment installed and ready for use at a customer’s premises
Note 1 to entry: This includes mounting the equipment as appropriate, and where a multi-device payment metering
installation is involved, the connection of each unit of equipment as appropriate. It also includes the connection of
the supply network to the supply interface, the connection of the customer’s load circuit to the load interface, and
the commissioning of the equipment into an operational state as a payment metering installation.
3.1.9
prepayment mode
payment mode in which automatic interruption occurs when available credit value is exhausted
3.1.10
social credit
amount of additional credit for which the consumer has not paid in advance but shall be repaid
or a period of time within which supply will not be interrupted despite credit exhaustion
3.1.11
specified matching socket
comprises a base with jaws to accept
and connect to the plug-in unit, terminals for connection of the supply network and the consumer
load circuit, and appropriate secure fixing and sealing arrangements
Note 1 to entry: The payment meter is capable of meeting the relevant type-testing requirements when it is properly
installed in any specified matching socket.
3.1.12
supply control switch
SCS
SEE: IEC 62052-31:2015, 3.7.2
3.1.13
supply interface
terminal(s) where the supply network is connected to a payment meter, or to a specified
matching socket, where applicable
3.1.14
time-based credit
payment meter accounting functions that deal with the calculation and transacting of a (social)
grant of credit that is released on a scheduled time basis
Note 1 to entry: See IEC 62055-21:2005, 13.8.3.
3.1.15
user interface
that part of a payment meter or payment metering installation that allows the customer to
monitor and operate the installation
Note 1 to entry: It may also facilitate meter reading and inspection, and metering services activities.
Note 2 to entry: Where physical token carriers are employed, it includes a token carrier interface.
3.2 Tokens
3.2.1
token
information content including an instruction issued on a token
carrier by a vending or management system that is capable of subsequent transfer to and
acceptance by a specific payment meter, or one of a group of meters, with appropriate security
Note 1 to entry: In a more general sense, the token refers to the instruction and information being transferred, while
the token carrier refers to the physical device being used to carry the instruction and information, or to the
communications medium in the case of a virtual token carrier.
[SOURCE: IEC 62051:1999, 17.66]
subset of data elements, containing an instruction and information,
that is present in the APDU of the application layer of the POS to Token Carrier Interface, and
which is also transferred to the payment meter by means of a token carrier
– 12 – IEC 62055-31:2022 © IEC 2022
3.2.2
credit token
value token
token that represents an amount of credit in monetary or energy value for transfer from the
vending point to the payment meter
3.2.3
duplicate token
token that contains the same information as a token that has already been issued, and hence
may also be a valid token
Note 1 to entry: This is not the same as a replacement token (refer also to 3.4.9).
Note 2 to entry: A duplicate token is a reissue of the same token that was previously issued and is identical to it in
all aspects; whereas a replacement token is a newly generated token in place of a previously generated token and
may not be identical to it in all aspects.
3.2.4
multiple-use token
token (such as a test token) that can be used for more than one successful session in a payment
meter or possibly with each in a group of meters
Note 1 to entry: These are typically used for meter reading or service purposes on repeated occasions.
3.2.5
no-value token
token that does not result in a financial advantage or disadvantage to the consumer, which may
contain meter configuration data, or instructions to perform certain tests, or to display certain
values on the user interface, or to retrieve certain data from the meter and return it on a token
carrier
Note 1 to entry: This is as opposed to value token.
3.2.6
replacement token
SEE: 3.4.9
Note 1 to entry: This is not the same as a duplicate token (see 3.2.3).
3.2.7
single-use token
token (such as a credit token) that can only be used for one successful session in a payment
meter
3.2.8
valid token
, token that is capable
of being processed successfully by the meter(s)
3.2.9
value token
SEE:3.2.2
3.3 Token carriers
3.3.1
token carrier
devices or media used to transport and present token
information to payment meters, such as printed paper, magnetic card, electronic memory
card/key, microprocessor card, or data communications networks
Note 1 to entry: The token carrier may also carry ancillary control or monitoring information to or from the payment
meter, depending upon system type and requirements.
medium that is used in the physical layer of the POS to Token
Carrier Interface, onto which the token is modulated or encoded, and which serves to carry the
token from the point where it is generated to the remote payment meter, where it is received
3.3.2
blank token carrier
physical token carrier that has not been processed at the vending point or elsewhere and hence
contains no specific data
3.3.3
disposable token carrier
token carrier that is not capable of further use once it has been accepted or used, such as a
paper-based magnetic card
3.3.4
machine-readable token carrier
physical or virtual token carrier carrying token information that is capable of being read and
processed automatically on presentation to an appropriate payment meter, without further
manual operation
EXAMPLE A token employing a magnetic card as the token carrier.
3.3.5
memory token carrier
physical token carrier containing a non-volatile memory device, in which the token is
electronically encoded and stored while it is being transported
3.3.6
microprocessor token carrier
physical token carrier containing a microprocessor device with non-volatile memory, in which
the token is electronically encoded and stored while it is being transported
Note 1 to entry: In addition to the token information, the microprocessor token carrier may also contain an
application programme and associated data.
3.3.7
numeric token carrier
token transfer method where the token information can be represented in a secure manner by
a visible and human readable sequence of numeric digits (typically 20 digits printed on a receipt)
Note 1 to entry: They may be entered into a payment meter via a keypad interface for evaluation and action.
3.3.8
one-way token carrier
physical or virtual token carrier which is used for the transfer of credit and possibly tariff and
configuration data in a single direction from the vending point or the management system to the
payment meter
3.3.9
physical token carrier
token carrier that requires a human to transport it at least part of the way between the point
where the toke
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...