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
Current Stage
PPUB - Publication issued
Completion Date
21-Jun-2022
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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)
IEC 62055-31:2022-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 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

---------------------- Page: 4 ----------------------
IEC 62055-31:2022 © IEC 2022 – 3 –

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

---------------------- Page: 5 ----------------------
– 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

---------------------- Page: 6 ----------------------
IEC 62055-31:2022 © IEC 2022 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICITY METERING – PAYMENT SYSTEMS –
Part 31: Particular requirements –
Static payment meters for active energy (classes 0,5, 1 and 2)
FOREWORD

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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.
---------------------- Page: 7 ----------------------
– 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.
---------------------- Page: 8 ----------------------
IEC 62055-31:2022 © IEC 2022 – 7 –
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.
---------------------- Page: 9 ----------------------
– 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
...

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