IEC 62055-31:2022

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

• Status: Published
• Publication Date: 20-Jun-2022
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 13 - Electrical energy measurement and control
• Drafting Committee: WG 15 - TC 13/WG 15
• Current Stage: PPUB - Publication issued
• Start Date: 08-Jul-2022
• Completion Date: 21-Jun-2022

Relations

• Revises: IEC 62055-31:2005 - Electricity metering - Payment systems - Part 31: Particular requirements - Static payment meters for active energy (classes 1 and 2)
• Effective Date: 05-Sep-2023
• Revises: IEC 62055-31:2005/COR1:2007 - Corrigendum 1 - Electricity metering - Payment systems - Part 31: Particular requirements - Static payment meters for active energy (classes 1 and 2)
• Effective Date: 05-Sep-2023

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.: [phone]
3, rue de Varembé [e-mail]
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.

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need further assistance, please contact the Customer Service
Centre: [e-mail].
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 .
...

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.

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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.

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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 .
...