SIST EN 50470-3:2022
(Main)Electricity metering equipment - Part 3: Particular requirements - Static meters for AC active energy (class indexes A, B and C)
Electricity metering equipment - Part 3: Particular requirements - Static meters for AC active energy (class indexes A, B and C)
This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of
alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests.
NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052
series or EN 62059 series.
This document applies to electricity metering equipment designed to:
— measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC;
NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal
voltages. See EN 62052-31:2016, Table 7. EN 62052-31:2016 covers AC voltages only up to 600 V and Ed. 2 of
EN IEC 62052-31 will cover AC voltages up to 1000 V.
— have all functional elements, including add-on modules, enclosed in, or forming a single meter case with
exception of indicating displays;
— operate with integrated or detached indicating displays;
— be installed in specified matching sockets or racks;
— optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with low power instrument transformers (LPITs as defined in the EN 61869
series) can be tested for compliance with this document only if such meters and their LPITs are tested together
and meet the requirements for directly connected meters.
NOTE 3 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,
current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control functions;
delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions.
The relevant standards for these functions could apply in addition to the requirements of this document. However, the
requirements for such functions are outside the scope of this document.
NOTE 4 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as
voltage magnitude, current magnitude, power, frequency, etc., are covered in EN 61557-12:2008. However, devices
compliant with EN 61557-12:2008 are not intended to be used as billing meters unless they are also compliant with the
EN IEC 62052-11:2021/A11:2022 and EN 50470-3:2022 standards.
NOTE 5 Product requirements for power quality instruments (PQIs) are covered in EN 62586-1:2017. Requirements for
power quality measurement techniques (functions) are covered in EN 61000-4-30:2015. Requirements for testing of the
power quality measurement functions are covered in EN 62586-2:2017.
This document does not apply to:
— meters for which the line-to-neutral voltage derived from nominal voltages exceeds 1 000 V AC;
— meters intended for connection with low power instrument transformers (LPITs as defined in the EN 61869
series) when tested without such transformers;
— metering systems comprising multiple devices (except of LPITs) physically remote from one another;
— portable meters;
NOTE 6 Portable meters are meters that are not permanently connected.
— meters used in rolling stock, vehicles, ships and airplanes;
— laboratory and meter test equipment;
reference standard meters;
— data interfaces to the register of the meter;
— matching sockets or racks used for installation of electricity metering equipment;
— any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise
meter’s performance (tampering).
NOTE 7 Nevertheless, specific tampering detection and prevention requirements, and test methods, as relevant for a
particular market are subject to the agreement between the manufacturer and the purchaser.
NOTE 8 Specifying requirements and test methods for fraud detection and prevention would be counterproductive, a
Elektrizitätszähler - Teil 3: Besondere Anforderungen - Elektronische Wechselstrom Wirkverbrauchszähler der Genauigkeitsklassen A, B und C
Equipement de comptage d'électricité - Partie 3: Exigences particulières - Compteurs statiques d'énergie active en courant alternatif (indices de classe A, B et C)
Le présent document s’applique uniquement aux compteurs statiques d’énergie active de classes de précision A, B et C, destinés à la mesure de l’énergie électrique active en courant alternatif sur les réseaux électriques en 50 Hz et 60 Hz, et à leurs essais de type.
NOTE 1 Pour les exigences générales, notamment en matière de construction, de CEM, de sécurité, de sûreté de fonctionnement, etc., voir la série EN 62052 ou la série EN 62059 correspondante.
Le présent document s’applique aux équipements de comptage de l’électricité conçus pour:
- mesurer et piloter l’énergie électrique sur les réseaux électriques (secteur) avec une tension allant jusqu’à 1 000 V en courant alternatif;
NOTE 2 Pour les compteurs en courant alternatif, la tension mentionnée ci-dessus est la tension phase-neutre dérivée des tensions nominales. Voir l’EN 62052-31:2016, Tableau 7. L’EN 62052 31:2016 couvre des tensions en courant alternatif allant uniquement jusqu’à 600 V et l’édition 2 de l’EN IEC 62052 31 couvrira des tensions en courant alternatif jusqu’à 1 000 V.
- avoir tous les éléments fonctionnels, y compris les modules complémentaires, incorporés dans ou formant un boîtier de compteur unique, à l’exception des afficheurs;
- fonctionner avec des afficheurs intégrés ou séparés;
- être installés en racks ou embases spécifiés;
- assurer, en option, des fonctions supplémentaires, autres que celles relatives au comptage de l’énergie électrique.
Les compteurs conçus pour être alimentés par des transformateurs de mesure de faible puissance (LPIT, Low Power Instrument Transformers, définis dans la série EN 61869) peuvent uniquement être soumis à des essais de conformité au présent document si ces compteurs et leurs LPIT sont soumis à l’essai ensemble et satisfont aux exigences relatives aux compteurs à branchement direct.
NOTE 3 Les compteurs d’électricité modernes présentent généralement des fonctions supplémentaires, telles que la mesure de l’amplitude de tension, de l’amplitude de courant, de la puissance, de la fréquence, du facteur de puissance, etc.; la mesure des paramètres de qualité de l’alimentation; des fonctions de commande des charges; des fonctions de distribution, de temporisation, d’essai, de gestion, d’enregistrement; des fonctions relatives aux interfaces de communication de données et à la sécurité des données associées. Les normes pertinentes pour ces fonctions peuvent s’appliquer en plus des exigences du présent document. Toutefois, les exigences relatives à ces fonctions ne relèvent pas du domaine d’application du présent document.
NOTE 4 Les exigences de produits concernant les dispositifs de mesure et de surveillance des performances (PMD, Power Metering and Monitoring Devices) et des fonctions de mesure telles que l’amplitude de tension, l’amplitude de courant, la puissance, la fréquence, etc. sont traitées dans l’EN 61557-12:2008. Toutefois, les dispositifs conformes à l’EN 61557-12:2008 ne sont pas destinés à être utilisés en tant que compteurs de facturation, sauf s’ils sont également conformes aux normes EN IEC 62052-11:2021/A11:2022 et EN 50470-3:2022.
NOTE 5 Les exigences de produits concernant les instruments de mesure de la qualité de l’alimentation (PQI, Power Quality Instrument) sont traitées dans l’EN 62586-1:2017. Les exigences relatives aux techniques (fonctions) de mesure de la qualité de l’alimentation sont traitées dans l’EN 61000-4-30:2015. Les exigences relatives aux essais des fonctions de mesure de la qualité de l’alimentation sont traitées dans l’EN 62586-2:2017.
Le présent document ne s’applique pas:
[...]
Oprema za merjenje električne energije - 3. del: Posebne zahteve - Statični števci za izmenično delovno energijo (razredni indeksi A, B in C)
Ta dokument se uporablja za statične števce delovne energije razredov natančnosti A, B in C za merjenje delovne električne energije pri izmeničnem toku v omrežju 50 Hz ali 60 Hz ter se uporablja le za tipsko preskušanje teh števcev.
OPOMBA 1: Splošne zahteve, na primer za izdelavo, elektromagnetno združljivost (EMC), varnost, zanesljivost itd. so podane v ustreznih skupinah standardov EN 62052 ali EN 62059.
Ta dokument se uporablja za opremo za merjenje električne energije, zasnovano:
– za merjenje in nadzor električne energije v električnih omrežjih z napetostjo 1000 V pri izmeničnem toku;
OPOMBA 2: Za merilnike električne energije za izmenični tok je zgoraj omenjena napetost napetost med linijskim in nevtralnim vodnikom, izpeljana iz nazivnih napetosti. Glej EN 62052-31:2016, preglednica 7. Standard EN 62052-31:2016 zajema napetosti pri izmeničnem toku le do 600 V, 2. izdaja standarda EN IEC 62052-31 pa bo zajemala napetosti pri izmeničnem toku do 1000 V;
– z vsemi funkcionalnimi elementi, vključno z dodatnimi moduli, v enotnem ohišju, razen prikazovalnikov;
– za delovanje z integriranimi ali ločenimi prikazovalniki;
– za namestitev v določeno ustrezno vtičnico ali stojalo;
– za zagotavljanje dodatnih funkcij po izbiri poleg tistih, ki so namenjene merjenju električne energije.
Merilnike, zasnovane za delovanje z instrumentnimi transformatorji majhne moči (LPIT, kot so opredeljeni v skupini standardov EN 61869), je mogoče preskusiti glede skladnosti s tem dokumentom le, če se takšni merilniki in njihovi instrumentni transformatorji majhne moči preskusijo skupaj in izpolnjujejo zahteve za neposredno povezane merilnike.
OPOMBA 3: Sodobni števci električne energije običajno vsebujejo dodatne funkcije, kot so merjenje velikosti napetosti, velikosti toka, moči, frekvence, faktorja moči itd.; merjenje parametrov kakovosti električne energije; funkcije krmiljenja obremenitve; funkcije dobave, časa, preskušanja, vodenja evidence, beleženja; podatkovni komunikacijski vmesniki in povezane funkcije za varnost podatkov.
Poleg zahtev iz tega dokumenta lahko veljajo ustrezni standardi za te funkcije. Vendar zahteve za te funkcije ne spadajo na področje uporabe tega dokumenta.
OPOMBA 4: Zahteve glede izdelkov za naprave za merjenje in nadzorovanje moči (PMD) in merilne funkcije, kot so velikost napetosti, velikost toka, moč, frekvenca itd., so zajete v standardu EN 61557-12:2008. Vendar naprave, ki so skladne s standardom EN 61557-12:2008, niso namenjene uporabi kot merilniki za obračunavanje, razen če so skladne tudi s standardoma EN IEC 62052-11:2021/A11:2022 in EN 50470-3:2022.
OPOMBA 5: Zahteve glede izdelkov za instrumente za kakovost napajanja (PQI) so obravnavane v standardu EN 62586-1:2017. Zahteve za tehnike (funkcije) merjenja kakovosti napajanja so zajete v standardu EN 61000-4-30:2015. Zahteve za preskušanje funkcij merjenja kakovosti napajanja so opisane v standardu EN 62586-2:2017.
Ta dokument se ne uporablja za:
– merilnike, pri katerih napetost med linijskim in nevtralnim vodnikom, izpeljana iz nazivnih napetosti, presega 1000 V pri izmeničnem toku;
– merilnike, namenjene za povezavo z instrumentnimi transformatorji majhne moči (LPIT, kot so opredeljeni v skupini standardov EN 61869), kadar se preskušajo brez takih transformatorjev;
– merilne sisteme, sestavljene iz več naprav (razen LPIT), ki so medsebojno fizično oddaljene;
– prenosne merilnike;
OPOMBA 6: Prenosni merilniki so merilniki, ki niso trajno priključeni.
– merilnike, ki se uporabljajo v tirnih vozilih, vozilih, ladjah in letalih;
– laboratorijsko in preskusno opremo za merilnike;
standardne referenčne merilnike;
– podatkovne vmesnike, povezane v register števca;
– ustrezne vtičnice ali stojala, ki se uporabljajo za namestitev opreme za merjenje električne energije;
– vse dodatne funkcije, ki jih zagotavljajo merilniki električne energije.
Ta dokument ne zajema ukrepov za odkrivanje in preprečevanje poskusov goljufije z vplivanjem na
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50470-3:2022
01-september-2022
Nadomešča:
SIST EN 50470-3:2007
SIST EN 50470-3:2007/A1:2019
Oprema za merjenje električne energije - 3. del: Posebne zahteve - Statični števci
za izmenično delovno energijo (razredni indeksi A, B in C)
Electricity metering equipment - Part 3: Particular requirements - Static meters for AC
active energy (class indexes A, B and C)
Elektrizitätszähler - Teil 3: Besondere Anforderungen - Elektronische Wechselstrom
Wirkverbrauchszähler der Genauigkeitsklassen A, B und C
Equipement de comptage d'électricité - Partie 3: Exigences particulières - Compteurs
statiques d'énergie active en courant alternatif (indices de classe A, B et C)
Ta slovenski standard je istoveten z: EN 50470-3:2022
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST EN 50470-3:2022 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50470-3:2022
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SIST EN 50470-3:2022
EUROPEAN STANDARD EN 50470-3
NORME EUROPÉENNE
EUROPÄISCHE NORM June 2022
ICS 91.140.50 Supersedes EN 50470-3:2006 + A1:2018
English Version
Electricity metering equipment - Part 3: Particular requirements -
Static meters for AC active energy (class indexes A, B and C)
Equipement de comptage d'électricité - Partie 3: Exigences Elektrizitätszähler - Teil 3: Besondere Anforderungen -
particulières - Compteurs statiques d'énergie active en Elektronische Wechselstrom Wirkverbrauchszähler der
courant alternatif (indices de classe A, B et C) Genauigkeitsklassen A, B und C
This European Standard was approved by CENELEC on 2022-04-11. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50470-3:2022 E
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SIST EN 50470-3:2022
EN 50470-3:2022 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Standard electrical values . 7
4.1 Voltages . 7
4.2 Currents . 7
4.2.1 General . 7
4.2.2 Nominal current . 8
4.2.3 Starting current . 8
4.2.4 Minimum current . 8
4.2.5 Maximum current . 8
4.3 Frequencies . 8
4.4 Power consumption . 8
5 Construction requirements . 8
6 Meter marking and documentation . 9
7 Accuracy requirements . 9
7.1 General test conditions . 9
7.2 Methods of accuracy verification . 9
7.3 Measurement uncertainty . 9
7.4 Meter constant . 9
7.5 Initial start-up of the meter . 9
7.6 Test of no-load condition . 9
7.7 Starting current test . 9
7.8 Repeatability test .10
7.9 Allowable errors due to variation of the current .10
7.10 Allowable errors due to influence quantities and disturbances .11
7.11 Time-keeping accuracy .16
7.12 Accuracy tests at reference conditions .16
7.13 Error of measurement .16
8 Climatic conditions .17
8.1 General .17
8.2 Test of the effect of the climatic environments .17
9 The effects of external influences .17
10 Requirements concerning the software and protection against corruption .18
10.1 General .18
10.2 Identification of functions implemented in software .18
10.3 Identification and protection of software .18
10.4 Identification and protection of metrologically relevant parameters .18
10.5 Setting of parameters .19
10.6 Protection of measurement data .19
10.7 Protection against influence by metrologically non-relevant software .19
10.8 Protection against influence by connecting another device .19
11 Type test .19
12 Durability .19
13 Reliability .20
2
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SIST EN 50470-3:2022
EN 50470-3:2022 (E)
Annex A (informative) Calculation of the error of measurement . 21
Annex B (informative) Differences between IEC and Directive 2014/32/EU . 22
Annex C (informative) Accuracy classes . 25
C.1 General . 25
C.2 Accuracy classes . 25
Annex ZZ (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/32/EU aimed to be covered . 26
Bibliography . 29
3
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SIST EN 50470-3:2022
EN 50470-3:2022 (E)
European foreword
This document (EN 50470-3:2022) has been prepared by CLC/TC 13 “Electrical energy measurement and
control”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-04-11
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-04-11
conflicting with this document have to be
withdrawn
This document supersedes EN 50470-3:2006 and all of its amendments and corrigenda.
EN 50470-3:2022 includes the following significant technical changes with respect to EN 50470-3:2006: it is
based on EN IEC 62052-11:2021/A11:2022 instead of EN 50470-1:2006.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a Standardization Request given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s)
/ Regulation(s).
For the relationship with EU Directive(s) / Regulation(s), see informative Annex ZZ, which is an integral part of
this document.
This document is related to:
— EN IEC 62053-21:2021/A11:2021, Electricity metering equipment – Particular requirements – Part 21:
Static meters for AC active energy (classes 0,5, 1 and 2)
— EN IEC 62053-22:2021/A11:2021, Electricity metering equipment – Particular requirements – Part 22:
Static meters for AC active energy (classes 0,1 S, 0,2 S and 0,5 S).
NOTE Terms differences for accuracy classes in related standards (EN IEC 62053-21:2021/A11:2021 and
EN IEC 62053-22:2021/A11:2021) and Directive 2014/32/EU are listed in Annex C.
The structure of the standards is similar; modifications in this document are provided in the perspective of
compliance with the Essential Requirements of Directive 2014/32/EU on Measuring Instruments (MID).
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
4
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SIST EN 50470-3:2022
EN 50470-3:2022 (E)
1 Scope
This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of
alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests.
NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052
series or EN 62059 series.
This document applies to electricity metering equipment designed to:
— measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC;
NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal
voltages. See EN 62052-31:2016, Table 7. EN 62052-31:2016 covers AC voltages only up to 600 V and Ed. 2 of
EN IEC 62052-31 will cover AC voltages up to 1000 V.
— have all functional elements, including add-on modules, enclosed in, or forming a single meter case with
exception of indicating displays;
— operate with integrated or detached indicating displays;
— be installed in specified matching sockets or racks;
— optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with low power instrument transformers (LPITs as defined in the EN 61869
series) can be tested for compliance with this document only if such meters and their LPITs are tested together
and meet the requirements for directly connected meters.
NOTE 3 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,
current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control functions;
delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions.
The relevant standards for these functions could apply in addition to the requirements of this document. However, the
requirements for such functions are outside the scope of this document.
NOTE 4 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as
voltage magnitude, current magnitude, power, frequency, etc., are covered in EN 61557-12:2008. However, devices
compliant with EN 61557-12:2008 are not intended to be used as billing meters unless they are also compliant with the
EN IEC 62052-11:2021/A11:2022 and EN 50470-3:2022 standards.
NOTE 5 Product requirements for power quality instruments (PQIs) are covered in EN 62586-1:2017. Requirements for
power quality measurement techniques (functions) are covered in EN 61000-4-30:2015. Requirements for testing of the
power quality measurement functions are covered in EN 62586-2:2017.
This document does not apply to:
— meters for which the line-to-neutral voltage derived from nominal voltages exceeds 1 000 V AC;
— meters intended for connection with low power instrument transformers (LPITs as defined in the EN 61869
series) when tested without such transformers;
— metering systems comprising multiple devices (except of LPITs) physically remote from one another;
— portable meters;
NOTE 6 Portable meters are meters that are not permanently connected.
— meters used in rolling stock, vehicles, ships and airplanes;
— laboratory and meter test equipment;
5
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SIST EN 50470-3:2022
EN 50470-3:2022 (E)
— reference standard meters;
— data interfaces to the register of the meter;
— matching sockets or racks used for installation of electricity metering equipment;
— any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise
meter’s performance (tampering).
NOTE 7 Nevertheless, specific tampering detection and prevention requirements, and test methods, as relevant for a
particular market are subject to the agreement between the manufacturer and the purchaser.
NOTE 8 Specifying requirements and test methods for fraud detection and prevention would be counterproductive, as
such specifications would provide guidance for potential fraudsters.
NOTE 9 There are many types of meter tampering reported from various markets; therefore, designing meters to detect
and prevent all types of tampering could lead to unjustified increase in costs of meter design, verification and validation.
NOTE 10 Billing systems, such as smart metering systems, are capable of detecting irregular consumption patterns and
irregular network losses which enable discovery of suspected meter tampering.
NOTE 11 For transformer operated meters paired with current transformers (CTs) according to EN 61869-2: the standard
CT measuring range is specified from 0,05 I to I for accuracy classes 0,1, 0,2, 0,5 and 1 and these CTs are used for
n max
meters of class C, B and A according to this document.
NOTE 12 This document does not specify emission requirements, these are specified in
EN IEC 62052-11:2021/A11:2022, 9.3.14.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN IEC 62052-11:2021/A11:2022, Electricity metering equipment – General requirements, tests and test
conditions - Part 11: Metering equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN IEC 62052-11:2021/A11:2022 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
NOTE The definitions listed here take precedence over those in EN IEC 62052-11:2021/A11:2022.
3.1
transitional current
I
tr
value of the current at, and above which, up to I full accuracy requirements of this document apply
max
6
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SIST EN 50470-3:2022
EN 50470-3:2022 (E)
3.2
influence quantity
quantity that is not the measurand but that affects the result of measurement
3.3
disturbance
influence quantity having a value within the limits specified in the appropriate requirement but outside the
specified rated operating conditions of the measuring instrument
Note 1 to entry: An influence quantity is a disturbance if for that influence quantity the rated operating conditions are not
specified.
3.4
critical change value
value at which the change in the measurement result is considered undesirable
Note 1 to entry: The critical change value specifies here the maximum change in the measurement results for all
disturbances. This definition is the same definition as in the Directive 2014/32/EU. In EN IEC 62052-11:2021/A11:2022, the
critical change value has another definition and meaning and applies only for tests without any current.
3.5
rated operating condition
value for the measurand and influence quantities making up the normal working conditions of an instrument
3.6
maximum permissible error
MPE
maximum allowable error under rated operating conditions and in the absence of a disturbance
4 Standard electrical values
4.1 Voltages
The values in EN IEC 62052-11:2021/A11:2022, 4.1 apply.
4.2 Currents
4.2.1 General
Table 1 — Preferred values of I and I
tr n
Meters Current Value of current
A
0,1–0,2–0,5–1–1,5–2–3–4–
I
tr
5–6,3–8–10–12,5
For direct connection
I 1–2–5–10–15–20–30–40–
n
50–63–80–100–125
I 0,05–0,1–0,25
tr
Transformer operated
I 1–2–5
n
For meters intended for operation with LPITs, the values in Table 1 for direct connection apply to the primary
ratings of the LPITs used with the meter.
NOTE 1 The values for I are from EN IEC 62052-11:2021/A11:2022, Table 3.
n
7
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NOTE 2 Meters operating with external LPITs are sometimes specified for nominal current values greater than the values
in Table 1, e.g. common values to be considered are 160 A, 200 A, 250 A, 400 A, 500 A, 600 A, 630 A.
4.2.2 Nominal current
The nominal current I for direct connected meters shall be 10 I .
n tr
The nominal current I for transformer operated meters shall be 20 I .
n tr
4.2.3 Starting current
Starting current I relation to I is shown in Table 2 below.
st
tr
Table 2 — Starting current
Meters Meters of class index Power
factor
A B C
For direct connection ≤ 0,05 I ≤ 0,04 I ≤ 0,04 I 1
tr tr tr
Transformer operated ≤ 0,06 I ≤ 0,04 I ≤ 0,02 I 1
tr tr tr
4.2.4 Minimum current
Minimum current I relation to I is shown in Table 3 below.
min tr
Table 3 — Minimum current
Meters Meters of class index
A B C
For direct connection ≤ 0,5 I ≤ 0,5 I ≤ 0,3 I
tr tr tr
Transformer operated ≤ 0,4 I ≤ 0,2 I ≤ 0,2 I
tr tr tr
4.2.5 Maximum current
Maximum current I relation to I is shown in Table 4 below.
max tr
Table 4 — Maximum current
Meters Meters of class index
A B C
For direct connection ≥ 50 I ≥ 50 I ≥ 50 I
tr tr tr
Transformer operated ≥ 24 I ≥ 24 I ≥ 24 I
tr tr tr
4.3 Frequencies
The values given in EN IEC 62052-11:2021/A11:2022, 4.3 apply.
4.4 Power consumption
The values given in EN IEC 62052-11:2021/A11:2022, 4.4 apply.
5 Construction requirements
The requirements given in EN IEC 62052-11:2021/A11:2022, Clause 5 apply.
8
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EN 50470-3:2022 (E)
In addition to the requirements in EN IEC 62052-11:2021/A11:2022, 5.6, these requirements apply:
n n n
a) The scale interval for a measured value shall be in the form 1 × 10 , 2 × 10 , or 5 × 10 , where n is any
integer or zero. The unit of measurement or its symbol shall be shown close to the numerical value.
b) The indication of any result shall be clear and unambiguous and accompanied by such marks and
inscriptions necessary to inform the user of the significance of the result. Easy reading of the presented
result shall be permitted under normal conditions of use. Additional indications may be shown provided
they cannot be confused with the metrologically controlled indications.
NOTE 1 Metrologically relevant information on the display requires an unambiguous identification of the way it is defined.
The user manual could provide additional details.
NOTE 2 The mechanical tests specified in EN IEC 62052-11:2021/A11:2022 are deemed to provide evidence for
compliance with the M1 and M2 requirements (see 2014/32/EU, Measuring Instruments Directive), if the meter after the
tests shows no damage or change of the information and operates correctly in accordance with the requirements of
EN IEC 62052-11:2021/A11:2022. As static meters have no moving parts, it is sufficient to perform metrological tests after
the mechanical tests only.
6 Meter marking and documentation
The requirements of EN IEC 62052-11:2021/A11:2022, Clause 6 apply.
7 Accuracy requirements
7.1 General test conditions
Tests and test conditions given in EN IEC 62052-11:2021/A11:2022, 7.1 apply.
7.2 Methods of accuracy verification
Tests and test conditions given in EN IEC 62052-11:2021/A11:2022, 7.2 apply.
7.3 Measurement uncertainty
The requirements, test conditions and procedures, and acceptance criteria of
EN IEC 62052-11:2021/A11:2022, 7.3 apply.
7.4 Meter constant
The requirements, test conditions and procedures, and acceptance criteria of
EN IEC 62052-11:2021/A11:2022, 7.4 apply.
7.5 Initial start-up of the meter
The requirements, test conditions and procedures, and acceptance criteria of
EN IEC 62052-11:2021/A11:2022, 7.5 apply.
7.6 Test of no-load condition
The requirements, test conditions and procedures, and acceptance criteria of
EN IEC 62052-11:2021/A11:2022, 7.6 apply. In addition to the test at 1,1 U , the test shall be executed at
n
0,8 U .
n
7.7 Starting current test
The requirements, test conditions and procedures, and acceptance criteria of
EN IEC 62052-11:2021/A11:2022, 7.7 apply.
9
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7.8 Repeatability test
The requirements, test conditions and procedures, and acceptance criteria of
EN IEC 62052-11:2021/A11:2022, 7.8 apply.
NOTE For static meters the results of the repeatability test are deemed to be sufficient for the reproducibility
requirement as stated in Annex I, Clause 2 of Directive 2014/32/EU.
7.9 Allowable errors due to variation of the current
When the meter is operated under reference conditions as specified in 7.1 of EN IEC 62052-11:2021/A11:2022,
Table 10, and the current and the power factor are varied, the percentage errors shall not exceed the limits
specified for the relevant class indexes in Table 5.
If the meter is designed for the measurement of energy in both directions, the values in Table 5 shall apply for
each direction.
If the meter is rated for multiple connection modes, the accuracy testing results are valid only for the connection
modes tested and cannot be used to claim accuracy for other untested connection modes.
Table 5 — Acceptable percentage error limits at reference conditions
(single-phase meters and poly-phase meters with balanced loads or single-phase loads)
Value of current Acceptable percentage error limits
for directly connected or for meters of class index
Power factor
transformer operated meters
A B C
I ≤ I < I 1 ±2,5 ±1,5 ±1,0
min tr
I ≤ I ≤ I 0,5 ind…1…cap 0,8 ±2,0 ±1,0 ±0,5
tr max
NOTE 1 The requirements for poly-phase meters operating with single-phase loads are exceeding requirements of
Directive 2014/32/EU, and non-compliance with Table 5 requirements does not necessarily imply non-compliance with
Directive 2014/32/EU for this specific test.
Additionally, for currents outside of the controlled current range (i.e. for currents below I or above I ),
min max
unduly biasing shall not occur. The percentage errors shall not exceed the limits specified for the relevant class
indexes in Table 6.
Table 6 — Acceptable percentage error limits at reference conditions
(single-phase meters and poly-phase meters with balanced loads or single-phase loads)
Value of current Acceptable percentage error limits
Power
for directly connected or for meters of class index
factor
transformer operated meters
A B C
I I I
min min min
I ≤ I < I
1
±2,5 · ±1,5 · ±1,0 ·
st min
I I I
NOTE 2 The limits between I ≤ I < I are from OIML R 46-1/-2:2012, section 3.3.3.
st min
NOTE 3 Values above I are not expected to occur in installations for longer durations normally (i.e. more than a few
max
hours in a year). However, error limits above I can be specified in an agreement between the manufacturer and the
max
purchaser or according to national regulatory requirements.
NOTE 4 Alternative approaches could be acceptable to demonstrate the requirement of no unduly biasing. The
specifications provided in this document represent the view of CLC/TC 13, WG 01 as the best practice to be followed.
10
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7.10 Allowable errors due to influence quantities and disturbances
Reference conditions as specified in 7.1 of EN IEC 62052-11:2021/A11:2022, Table 10 apply.
NOTE 1 Differences exist between terminologies in IEC standards and Directive 2014/32/EU. They are detailed in
Table B.1 of Annex B.
If the meter is rated for multiple connection modes, the accuracy requirements apply for each of the connection
modes. All tests of effects of influence quantities shall be performed in one connection mode selected to exercise
the complete metrological capability of the meter.
When the current and the phase displacement (power factor) are held constant as specified in 7.1 of
EN IEC 62052-11:2021/A11:2022, Table 10, and any single influence quantity is applied one at a time, with the
meter otherwise operated at reference conditions as specified in 7.1 of EN IEC 62052-11:2021/A11:2022,
Table 10, the variation in percentage error relative to the intrinsic error shall not exceed the limits specified for
the relevant class indexes given in Table 7 and Table 8.
The variation in percentage error due to temperature variation shall be determined for each sub-range within
...
SLOVENSKI STANDARD
oSIST prEN 50470-3:2021
01-julij-2021
Oprema za merjenje električne energije (a.c.) - 3. del: Posebne zahteve - Statični
števci za delovno energijo (razredni indeksi A, B in C)
Electricity metering equipment (AC) - Part 3: Particular requirements - Static meters for
active energy (class indexes A, B and C)
Wechselstrom-Elektrizitätszähler - Teil 3: Besondere Anforderungen - Elektronische
Wirkverbrauchszähler der Genauigkeitsklassen A, B und C
Équipement de comptage de l’électricité (c.a.) - Partie 3: Exigences particulières -
Compteurs statiques d’énergie active (indices de classe A, B et C)
Ta slovenski standard je istoveten z: prEN 50470-3
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
oSIST prEN 50470-3:2021 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50470-3:2021
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oSIST prEN 50470-3:2021
EUROPEAN STANDARD DRAFT
prEN 50470-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2021
ICS 91.140.50 Will supersede EN 50470-3:2006 and all of its
amendments and corrigenda (if any)
English Version
Electricity metering equipment (AC) - Part 3: Particular
requirements - Static meters for active energy (class indexes A,
B and C)
Équipement de comptage de l'électricité (c.a.) - Partie 3: Wechselstrom-Elektrizitätszähler - Teil 3: Besondere
Exigences particulières - Compteurs statiques d'énergie Anforderungen - Elektronische Wirkverbrauchszähler der
active (indices de classe A, B et C) Genauigkeitsklassen A, B und C
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-07-30.
It has been drawn up by CLC/TC 13.
If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 65802 Ref. No. prEN 50470-3 E
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prEN 50470-3:2021 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Standard electrical values . 7
4.1 Voltages . 7
4.2 Currents . 7
4.2.1 General . 7
4.2.2 Nominal current . 8
4.2.3 Starting current . 8
4.2.4 Minimum current . 8
4.2.5 Maximum current . 8
4.3 Frequencies . 8
4.4 Power consumption . 8
5 Construction requirements . 8
6 Meter marking and documentation . 9
7 Accuracy requirements . 9
7.1 General test conditions . 9
7.2 Methods of accuracy verification . 9
7.3 Measurement uncertainty . 9
7.4 Meter constant . 9
7.5 Initial start-up of the meter . 9
7.6 Test of no-load condition . 9
7.7 Starting current test .10
7.8 Repeatability test .10
7.9 Allowable errors due to variation of the current .10
7.10 Allowable errors due to influence quantities and disturbances .10
7.11 Time-keeping accuracy .15
7.12 Accuracy tests at reference conditions .15
7.13 Error of measurement .16
8 Climatic conditions .17
8.1 General .17
8.2 Test of the effect of the climatic environments .17
9 The effects of external influences .17
10 Requirements concerning the software and protection against corruption .18
10.1 General .18
10.2 Identification of functions implemented in software .18
10.3 Identification and protection of software .18
10.4 Identification and protection of metrologically relevant parameters .18
10.5 Setting of parameters .19
10.6 Protection of measurement data .19
10.7 Protection against influence by metrologically non-relevant software .19
10.8 Protection against influence by connecting another device .19
11 Type test .19
12 Durability .19
13 Reliability .20
Annex A (informative) Calculation of the error of measurement .21
Annex B (informative) Differences between IEC and directive 2014/32/EU .22
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Annex C (informative) Accuracy classes . 25
C.1 General . 25
C.2 Accuracy classes . 25
Annex ZZ (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/32/EU aimed to be covered . 26
Bibliography . 29
3
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European foreword
This document (prEN 50470-3:2021) has been prepared by CLC/TC 13 “Electrical energy measurement and
control”.
This document is currently submitted to the Enquiry.
The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
This document will supersede EN 50470-3:2006 and all of its amendments and corrigenda.
prEN 50470-3:2021 includes the following significant technical changes with respect to EN 50470-3:2006: it is
based on EN IEC 62052-11:2021 instead of EN 50470-1:2006.
This document has been prepared under a mandate given to CENELEC by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this document.
prEN 50470-3:2021 is related to:
— EN IEC 62053-21:2021, Electricity metering equipment – Particular requirements – Part 21: Static meters
for AC active energy (classes 0,5, 1 and 2)
— EN IEC 62053-22:2021, Electricity metering equipment – Particular requirements – Part 22: Static meters
for AC active energy (classes 0,1 S, 0,2 S and 0,5 S).
NOTE Terms differences for accuracy classes and current values in related standards (EN IEC 62053-21:2021 and
EN IEC 62053-22:2021) and directive 2014/32/EU are listed in Annex C.
The structure of the standards is similar; modifications in this document are provided in the perspective of
compliance with the Essential Requirements of Directive 2014/32/EU on Measuring Instruments (MID).
4
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1 Scope
This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of
alternating current electrical active energy in 50 Hz or 60 Hz networks and it applies to their type tests only.
NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052
series or EN 62059 series.
This document applies to electricity metering equipment designed to:
— measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC;
NOTE 2 For AC electricity meters, the voltage mentioned above is the line-to-neutral voltage derived from nominal
voltages. See EN 62052-31:2016, Table 7.
— have all functional elements, including add-on modules, enclosed in, or forming a single meter case with
exception of indicating displays;
— operate with integrated or detached indicating displays;
— be installed in a specified matching sockets or racks;
— optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with low power instrument transformers (LPITs as defined in the IEC 61869
series) can be tested for compliance with this document only if such meters and their LPITs are tested together
and meet the requirements for directly connected meters.
NOTE 3 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,
current magnitude, power, frequency, power factor, etc.; measurement of power quality parameters; load control functions;
delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions.
The relevant standards for these functions could apply in addition to the requirements of this document. However, the
requirements for such functions are outside the scope of this document.
NOTE 4 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as
voltage magnitude, current magnitude, power, frequency, etc., are covered in EN 61557-12. However, devices compliant
with EN 61557-12 are not intended to be used as billing meters unless they are also compliant with the
EN IEC 62052-11:2021 and prEN 50470-3:2021 standards.
NOTE 5 Product requirements for power quality instruments (PQIs) are covered in EN 62586-1. Requirements for power
quality measurement techniques (functions) are covered in EN 61000-4-30. Requirements for testing of the power quality
measurement functions are covered in EN 62586-2.
This document does not apply to:
— meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC;
— meters intended for connection with low power instrument transformers (LPITs as defined in the EN 61869
series) when tested without such transformers;
— metering systems comprising multiple devices (except of LPITs) physically remote from one another;
— portable meters;
NOTE 6 Portable meters are meters that are not permanently connected.
— meters used in rolling stock, vehicles, ships and airplanes;
— laboratory and meter test equipment;
5
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— reference standard meters;
— data interfaces to the register of the meter;
— matching sockets or racks used for installation of electricity metering equipment;
— any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise
meter’s performance (tampering).
NOTE 7 Nevertheless, specific tampering detection and prevention requirements, and test methods, as relevant for a
particular market are subject to the agreement between the manufacturer and the purchaser.
NOTE 8 Specifying requirements and test methods for fraud detection and prevention would be counterproductive, as
such specifications would provide guidance for potential fraudsters.
NOTE 9 There are many types of meter tampering reported from various markets; therefore, designing meters to detect
and prevent all types of tampering could lead to unjustified increase in costs of meter design, verification and validation.
NOTE 10 Billing systems, such as, smart metering systems, are capable of detecting irregular consumption patterns and
irregular network losses which enable discovery of suspected meter tampering.
NOTE 11 For transformer operated meters paired with current transformers (CTs) according EN 61869-2: the standard
CT measuring range is specified from 0,05 I to I for accuracy classes 0,1, 0,2, 0,5 and 1 and these CTs are used for
n max
meters of class C, B and A according to this document.
NOTE 12 This document does not specify emission requirements, these are specified in EN IEC 62052-11:2021, 9.3.14.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, the
latest edition of the referenced document (including any amendments) applies.
EN IEC 62052-11:2021, Electricity metering equipment – General requirements, tests and test conditions - Part
11: Metering equipment (IEC 62052-11:2020)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN IEC 62052-11:2021 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
NOTE The definitions listed here take precedence over those in EN IEC 62052-11:2021.
3.1
transitional current
I
tr
value of the current at, and above which, up to I full accuracy requirements of this document apply
max
3.2
influence quantity
quantity that is not the measurand but that affects the result of measurement
6
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3.3
disturbance
influence quantity having a value within the limits specified in the appropriate requirement but outside the
specified rated operating conditions of the measuring instrument
Note 1 to entry: An influence quantity is a disturbance if for that influence quantity the rated operating conditions are not
specified.
3.4
critical change value
value at which the change in the measurement result is considered undesirable
Note 1 to entry: The critical change value specifies here the maximum change in the measurement results for all
disturbances. In EN IEC 62052-11:2021, the critical change value has another definition and meaning and applies only for
tests without any current.
3.5
rated operating condition
value for the measurand and influence quantities making up the normal working conditions of an instrument
3.6
maximum permissible error
MPE
maximum allowable error under rated operating conditions and in the absence of a disturbance
4 Standard electrical values
4.1 Voltages
The values in EN IEC 62052-11:2021, 4.1 apply.
4.2 Currents
4.2.1 General
Table 1 — Preferred values of I and I
tr n
Meters for Current Value of current
A
I 0,1–0,2–0,5–1-1,5–2-3–4-5–
tr
6,3–8-10–12,5
Direct connection
I 1–2-5–10–15–20–30–40–50–
n
63–80–100–125
I 0,05–0,1–0,25
tr
Transformer operated
I 1–2-5
n
For meters intended for operation with LPITs, the values in Table 1 for direct connection apply to the primary
ratings of the LPITs used with the meter.
NOTE 1 The values for I are from EN IEC 62052-11:2021, Table 3.
n
NOTE 2 Meters operating with external LPITs are sometimes specified for nominal current values greater than the values
in Table 1, e.g. common values to be considered are 160A, 200A, 250A, 400A, 500A, 600A, 630A.
7
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4.2.2 Nominal current
The nominal current I for direct connected meters shall be 10 I .
n tr
The nominal current I for transformer operated meters shall be 20 I .
n tr
4.2.3 Starting current
Starting current relation to I is shown in Table 2 below.
tr
Table 2 — Starting current
Meters for Meters of class index Power
factor
A B C
Direct connection ≤ 0,05 I ≤ 0,04 I ≤ 0,04 I 1
tr tr tr
Transformer operated ≤ 0,06 I ≤ 0,04 I ≤ 0,02 I 1
tr tr tr
4.2.4 Minimum current
Starting current relation to I is shown in Table 3 below.
min
Table 3 — Minimum current
Meters for Minimum current I
min
Class A Class B Class C
Direct connection ≤ 0,5 I ≤ 0,5 I ≤ 0,3 I
tr tr tr
Transformer operated ≤ 0,4 I ≤ 0,2 I ≤ 0,2 I
tr tr tr
4.2.5 Maximum current
Starting current relation to I is shown in Table 4 below.
max
Table 4 — Maximum current
Meters for Maximum current I
max
Class A Class B Class C
Direct connection ≥ 50 I ≥ 50 I ≥ 50 I
tr tr tr
Transformer operated ≥ 24 I ≥ 24 I ≥ 24 I
tr tr tr
4.3 Frequencies
The values given in EN IEC 62052-11:2021, 4.3 apply.
4.4 Power consumption
The values given in EN IEC 62052-11:2021, 4.4 apply.
5 Construction requirements
The requirements given in EN IEC 62052-11:2021, Clause 5 apply.
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In addition to the requirements in EN IEC 62052-11:2021, 5.6, these requirements apply:
a) The scale interval for a measured value shall be in the form 1x10n, 2x10n, or 5x10n, where n is any integer
or zero. The unit of measurement or its symbol shall be shown close to the numerical value.
b) The indication of any result shall be clear and unambiguous and accompanied by such marks and
inscriptions necessary to inform the user of the significance of the result. Easy reading of the presented
result shall be permitted under normal conditions of use. Additional indications may be shown provided
they cannot be confused with the metrologically controlled indications.
NOTE 1 Metrologically relevant information on the display requires an unambiguous identification of the way it is defined.
The user manual could provide additional details.
NOTE 2 The mechanical tests specified in EN IEC 62052-11:2021 are deemed to provide evidence for compliance with
the M1 and M2 requirements, if the meter after the tests shows no damage or change of the information and operates
correctly in accordance with the requirements of EN IEC 62052-11:2021. As static meters have no moving parts, it is
sufficient to perform metrological tests after the mechanical tests only.
NOTE 3 In contrast to EN IEC 62052-11:2021, 5.6.2 (Meters without indicating displays), meters without indicating
display are not permitted under 2014/32/EU.
6 Meter marking and documentation
The requirements of EN IEC 62052-11:2021, Clause 6 apply together with those listed here.
The current measuring range shall be marked as follows:
— for direct connected meters, the minimum current (I ), nominal current (I ), and maximum current (I ),
min n max
for example, 0,5-10(80) A;
— the rated secondary current of transformer(s) to which a transformer-operated meter should be connected,
for example: /5 A or /1 A. The nominal current(s) and the maximum current(s) of the meter may be included
in the type designation.
7 Accuracy requirements
7.1 General test conditions
Tests and test conditions given in EN IEC 62052-11:2021, 7.1 apply.
7.2 Methods of accuracy verification
Tests and test conditions given in EN IEC 62052-11:2021, 7.2 apply.
7.3 Measurement uncertainty
The requirements, test conditions and procedures, and acceptance criteria of EN IEC 62052-11:2021, 7.3 apply.
7.4 Meter constant
The requirements, test conditions and procedures, and acceptance criteria of EN IEC 62052-11:2021, 7.4 apply.
7.5 Initial start-up of the meter
The requirements, test conditions and procedures, and acceptance criteria of EN IEC 62052-11:2021, 7.5 apply.
7.6 Test of no-load condition
The requirements, test conditions and procedures, and acceptance criteria of EN IEC 62052-11:2021, 7.6 apply.
In addition to the test at 1,1 U , the test shall be executed at 0,8 U .
n n
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7.7 Starting current test
The requirements, test conditions and procedures, and acceptance criteria of EN IEC 62052-11:2021, 7.7 apply.
7.8 Repeatability test
The requirements, test conditions and procedures, and acceptance criteria of EN IEC 62052-11:2021, 7.8 apply.
NOTE The result of a reproducibility assessment according to the Directive 2014/32/EU is not expected to be
significantly different than for the repeatability test for static electricity meters.
7.9 Allowable errors due to variation of the current
When the meter is operated under reference conditions as specified in 7.1 of EN IEC 62052-11:2021, Table 10,
and the current and the power factor are varied, the percentage errors shall not exceed the limits specified for
the relevant class indexes in Table 5.
If the meter is designed for the measurement of energy in both directions, the values in Table 5 shall apply for
each direction.
If the meter is rated for multiple connection modes, the accuracy testing results are valid only for the connection
modes tested and cannot be used to claim accuracy for other untested connection modes.
Table 5 — Acceptable percentage error limits at reference conditions
(single-phase meters and poly-phase meters with balanced loads or single-phase loads)
Value of current Acceptable percentage error limits
for direct connected or for meters of class index
Power factor
transformer operated meters
A B C
I ≤ I < I 1 ± 2,5 ± 1,5 ± 1,0
min tr
I ≤ I ≤ I 0,5 ind…1…cap 0,8 ± 2,0 ± 1,0 ± 0,5
tr max
Additionally, for currents outside of the controlled current range (i.e. between I and I ), unduly biasing
min max
shall not occur. The percentage errors shall not exceed the limits specified for the relevant class indexes in
Table 6.
Table 6 — Acceptable percentage error limits at reference conditions
(single-phase meters and poly-phase meters with balanced loads or single-phase loads)
Value of current Acceptable percentage error limits
Power
for direct connected or for meters of class index
factor
transformer operated meters
A B C
I ≤ I < I 1 ± 2,5· I /I ± 1,5· I /I ± 1,0· I /I
st min min min min
NOTE 1 The limits between I ≤ I < I are from OIML R46-1/-2: 2012, section 3.3.3.
st min
NOTE 2 Values above I are not expected to occur in installations for longer durations normally (i.e. more than a few
max
hours in a year). However, error limits above I can be specified in an agreement between the manufacturer and the
max
purchaser or according to national regulatory requirements.
NOTE 3 Alternative approaches could be acceptable to demonstrate the requirement of no unduly biasing. The
specifications provided in this document represent the view of TC 13, WG 01 as the best practice to be followed.
7.10 Allowable errors due to influence quantities and disturbances
Reference conditions as specified in 7.1 of EN IEC 62052-11:2021, Table 10 apply.
10
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oSIST prEN 50470-3:2021
prEN 50470-3:2021 (E)
NOTE Differences exist between terminologies in IEC standards and directive 2014/32/EU. They are detailed in Table
B.1 of Annex B.
If the meter is rated for multiple connection modes, the accuracy requirements apply for each of the connection
modes. All tests of effects of influence quantities shall be performed in one connection mode selected to exercise
the complete metrological capability of the meter.
When the current and the phase displacement (power factor) are held constant as specified in 7.1 of
EN IEC 62052-11:2021, Table 10, and any single influence quantity is applied one at a time, with the meter
otherwise operated at reference conditions as specified in 7.1 of EN IEC 62052-11:2021, Table 10, the variation
in percentage error relative to the intrinsic error shall not exceed the limits specified for the relevant class indexes
given in Table 7 and Table 8.
The variation in percentage error due to temperature variatio
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