SIST EN 50470-1:2007
(Main)Electricity metering equipment (a.c.) -- Part 1: General requirements, tests and test conditions - Metering equipment (class indexes A, B and C)
Electricity metering equipment (a.c.) -- Part 1: General requirements, tests and test conditions - Metering equipment (class indexes A, B and C)
This European Standard applies to newly manufactured watt-hour meters, measuring active electrical energy, intended for residential, commercial and light industrial use, for use on 50 Hz electrical networks. It specifies general requirements and type tests methods. It applies to electromechanical or static watt-hour meters for indoor and outdoor application, consisting of a measuring element and register(s) enclosed in a meter case. It also applies to operation indicator(s) and test output(s). If the meter has (a) measuring element(s) for more than one type of energy (multi-energy meters), or when other functional elements, like maximum demand indicators, electronic tariff registers, time switches, ripple control receivers, data communication interfaces, etc. are enclosed in the meter case (multi-function meters) then this standard applies only for the active energy metering part. This standard distinguishes between: – electromechanical and static meters; – meters of class indexes A, B and C; – direct connected and transformer operated meters; – protective class I and protective class II meters; – meters intended to be used indoors and outdoors. It does not apply to: – watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters for polyphase systems); – portable meters; – reference meters. For rack-mounted meters, the mechanical properties are not covered in this standard. The test levels are regarded as minimum values to guarantee the proper functioning of the meter under normal working conditions. For special applications, other test levels might be necessary and should be agreed on between the user and the manufacturer.
Wechselstrom-Elektrizitätszähler -- Teil 1: Allgemeine Anforderungen, Prüfungen und Prüfbedingungen - Messeinrichtungen (Genauigkeitsklassen A, B und C)
Equipement de comptage d'électricité (c.a.) -- Partie 1: Prescriptions générales, essais et conditions d'essai - Equipement de comptage (classes de précision A, B et C)
La présente Norme Européenne s’applique aux compteurs d’énergie active neufs, destinés à la mesure de l’énergie électrique active, à l’usage des habitations, des commerces et des petites industries, et utilisés sur des réseaux électriques à 50 Hz. Elle spécifie les exigences générales et les méthodes d’essais de type. Elle n’est applicable qu’aux compteurs d’énergie active électromécaniques ou statiques de types intérieur et extérieur, constitués d’un élément de mesure et d’un (des) élément(s) indicateur(s) rassemblés dans un même boîtier. Elle s’applique également à (aux) l’indicateur(s) de fonctionnement et au(x) dispositif(s) de sortie d’essai. Si le compteur a un (des) élément(s) de mesure pour plusieurs types d’énergie (compteurs d’énergies multiples), ou si d’autres éléments fonctionnels comme indicateurs de maximum, éléments indicateurs tarifaires électroniques, horloges de commutation, récepteurs de télécommande centralisée, interfaces de communication de données, etc. sont incorporés dans le boîtier du compteur (compteurs à fonctions multiples), la présente norme ne s’applique alors qu’à la partie de comptage de l’énergie active. La présente norme distingue entre : – les compteurs électromécaniques et statiques ; – les compteurs d’indices de classe A, B et C ; – les compteurs à branchement direct et ceux alimentés par transformateur ; – les compteurs avec classe de protection I et II ; – les compteurs prévus pour l’utilisation à l’intérieur et à l’extérieur. Elle n’est pas applicable aux : – compteurs d’énergie active dont la tension entre les bornes de raccordement excède 600 V (tension entre phases pour les compteurs des systèmes polyphasés) ; – compteurs portatifs ; – compteurs de référence. Pour des compteurs montés en châssis, les propriétés mécaniques ne sont pas comprises dans la présente norme. Les niveaux d’essai sont considérés comme des valeurs minimales pour garantir le bon fonctionnement du compteur dans des conditions de fonctionnement normales. Pour des applications spéciales, d’autres niveaux d’essai pourraient être nécessaires et il convient que ceux-ci fassent l’objet d’un accord entre l’utilisateur et le constructeur.
Oprema za merjenje električne energije (a.c.) - 1. del: Splošne zahteve, preskušanje in preskusni pogoji - Merilna oprema (razredni indeksi A, B in C)
Ta evropski standard se nanaša na novo proizvedene merilnike Wh,ki merijo aktivno električno energijo namenjeno za domačo, komercialno in industrijsko uporabo na 50 Hz električnem omrežju. Poudarja osnovne zahteve in preskusne postopke. Nanaša se na elektro-mehanične ali statične merilnike Wh za notranjo in zunanjo montažo, sestavljeno iz meritvenih elementov in registrov, ki so priloženi v merilnem ohišju. Uporablja se tudi kot indikator delovanja in preskusni izhod. Če ima merilnik več merilnih elementov za več vrst energije (multi energijski merilnik) ali ko so ostali funkcionalni elementi, kot indikatorji maksimuma, elektronski tarifni registri, časovna stikala, kontrolni prejemniki nihanj, podatkovni komunikacijski interface, itn. priloženi v merilno ohišje (multi funkcionalni merilniki) potem se ta standard nanaša samo na aktivni energijski merilni del. Ta standard razlikuje med: - elektromehaničnimi in statičnimi merilniki; - merilniki z razrednimi indeksi A,B in C; - direktno povezanimi in prenosno delujočimi merilniki; - merilniki zaščitnega razreda I in II; - merilniki, ki so namenjeni za zunanjo in notranjo montažo. Ne nanaša se na: - Wh merilnike, kjer napetost na priključnih sponkah presega 600 V (medlinijska napetost za merilnike za večfazne sisteme); - prenosne merilnike; - referenčne merilnike. Za merilnike, ki se montirajo na standardizirane nosilce, mehanične lastnosti niso zajete v tem standardu. Preskusni nivoji veljajo za minimalne vrednosti, ki zagotavljajo pravilno delovanje merilnikov pod normalnimi delovnimi pogoji. Za posebne uporabe so lahko potrebni ostali preskusni nivoji ter morajo biti po dogovoru med uporabnikom in proizvajalcem.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2007
2SUHPD]DPHUMHQMHHOHNWULþQHHQHUJLMH DF GHO 6SORãQH]DKWHYH
SUHVNXãDQMHLQSUHVNXVQLSRJRML0HULOQDRSUHPD UD]UHGQLLQGHNVL$%LQ&
Electricity metering equipment (a.c.) -- Part 1: General requirements, tests and test
conditions - Metering equipment (class indexes A, B and C)
Wechselstrom-Elektrizitätszähler -- Teil 1: Allgemeine Anforderungen, Prüfungen und
Prüfbedingungen - Messeinrichtungen (Genauigkeitsklassen A, B und C)
Equipement de comptage d'électricité (c.a.) -- Partie 1: Prescriptions générales, essais et
conditions d'essai - Equipement de comptage (classes de précision A, B et C)
Ta slovenski standard je istoveten z: EN 50470-1:2006
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 50470-1
NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM
ICS 91.140.50
English version
Electricity metering equipment (a.c.)
Part 1: General requirements, tests and test conditions -
Metering equipment (class indexes A, B and C)
Equipement de comptage Wechselstrom-Elektrizitätszähler
d'électricité (c.a.) Teil 1: Allgemeine Anforderungen,
Partie 1: Prescriptions générales, Prüfungen und Prüfbedingungen -
essais et conditions d'essai - Messeinrichtungen
Equipement de comptage (Genauigkeitsklassen A, B und C)
(classes de précision A, B et C)
This European Standard was approved by CENELEC on 2006-05-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50470-1:2006 E
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 13, Equipment for
electrical energy measurement and load control.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50470-1 on 2006-05-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-05-01
This EN 50470-1 is related to EN 62052-11:2003, Electricity metering equipment (a.c.) – General
requirements, tests and test conditions – Part 11: Metering equipment.
The structure of the two standards is similar, modifications in this European Standard are provided in
the perspective of compliance with the essential requirements of the Directive 2004/22/EC on
Measuring Instruments (MID).
This standard is to be used with:
– EN 50470-2:2006, Electricity metering equipment (a.c.) – Part 2: Particular requirements –
Electromechanical meters for active energy (class indexes A and B) or
– EN 50470-3:2006, Electricity metering equipment (a.c.) – Part 3: Particular requirements –
Static meters for active energy (class indexes A, B and C).
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of EC
Directives 89/336/EMC and 2004/22/EC. See Annex ZZ.
__________
– 3 – EN 50470-1:2006
Contents
1 Scope.6
2 Normative references .6
3 Terms and definitions .9
3.1 General definitions .9
3.2 Definitions related to the functional elements .11
3.3 Definitions of mechanical elements .13
3.4 Definitions related to insulation .14
3.5 Definitions of meter quantities .15
3.6 Definitions of influence quantities .17
3.7 Definitions of tests.20
3.8 Definitions related to electromechanical meters.20
3.9 Abbreviations .21
4 Standard electrical values .21
4.1 Standard reference voltages.21
4.2 Standard currents and current ranges .21
4.3 Standard reference frequency .22
5 Mechanical requirements and tests .22
5.1 General mechanical requirements .22
5.2 Case .23
5.2.1 Requirements .23
5.2.2 Mechanical strength tests of meter case.23
5.3 Window .24
5.4 Terminals - Terminal block(s) - Protective earth terminal .24
5.5 Terminal cover(s) .25
5.6 Clearance and creepage distances.25
5.7 Insulating encased meter of protective class II .26
5.8 Resistance to heat and fire.26
5.9 Protection against penetration of dust and water .27
5.10 Display of measured values.27
5.11 Output device and operation indicator .28
5.11.1 General .28
5.11.2 Mechanical and electrical characteristics .28
5.11.3 Optical characteristics .29
5.12 Marking of meter .29
5.12.1 Name-plates .29
5.12.2 Connection diagrams and terminal marking .31
5.13 Accompanying information .31
6 Climatic conditions .31
6.1 Temperature ranges .31
6.2 Relative humidity.32
6.3 Tests of the effect of the climatic environments .32
6.3.1 General .32
6.3.2 Dry heat test (Test B) .32
6.3.3 Cold test (Test A) .33
6.3.4 Damp heat cyclic test (Test Db).33
6.3.5 Protection against solar radiation (Test Sa) .33
7 Electrical requirements .34
7.1 Voltage range.34
7.2 Heating .34
7.3 Insulation .34
7.3.1 Requirements .34
7.3.2 General test conditions.34
7.3.3 Impulse voltage test .35
7.3.4 AC voltage test.36
7.4 Electromagnetic compatibility (EMC) .36
7.4.1 Electromagnetic environment.36
7.4.2 General requirements and test conditions.37
7.4.3 Critical change value .37
7.4.4 Immunity to voltage dips and short interruptions .38
7.4.5 Immunity to electrostatic discharges .38
7.4.6 Immunity to radiated RF electromagnetic fields.39
7.4.7 Immunity to electrical fast transients/bursts .39
7.4.8 Immunity to conducted disturbances, induced by RF fields .40
7.4.9 Immunity to surges .40
7.4.10 Immunity to damped oscillatory waves.41
7.4.11 Immunity to continuous magnetic fields of external origin .41
7.4.12 Immunity to power frequency magnetic fields of external origin.41
7.4.13 Radio interference suppression .42
8 Type test .42
8.1 Test conditions.42
Annex A (normative) Relationship between ambient air temperature and relative
humidity .43
Annex B (normative) Optical test output.44
Annex C (normative) Voltage waveform for the tests of the effect of voltage dips and
short interruptions .45
Annex D (informative) Test set-up for electromagnetic compatibility (EMC) tests .46
Annex E (normative) Electromagnet for testing the influence of continuous magnetic
fields of external origin .48
Annex F (informative) Test schedule - Recommended test sequences .49
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives.51
Index .52
Figures
Figure A.1 – Relationship between ambient air temperature and relative humidity .43
Figure B.1 – Test arrangement for the test output.44
Figure B.2 – Waveform of the optical test output .44
Figure C.1 – Voltage interruptions of ΔU = 100 %, 1 s .45
Figure C.2 – Voltage interruptions of ΔU = 100 %, one cycle at rated frequency.45
Figure C.3 – Voltage dips of ΔU = 50 % .45
Figure D.1 – Test set-up for immunity to radiated RF electromagnetic fields.46
Figure D.2 – Test set-up for immunity to electrical fast transients/bursts: voltage circuits .46
Figure D.3 – Test set-up for immunity to electrical fast transients/bursts: current circuits.47
– 5 – EN 50470-1:2006
Figure E.1 – Electromagnet for testing the influence of continuous magnetic fields of
external origin.48
Tables
Table 1 – Standard reference voltages.21
Table 2 – Standard values of I , I and I .21
tr ref n
Table 3 – Current ranges.22
Table 4 – Clearances and creepage distances for insulating encased meter of protective
class I.26
Table 5 – Clearances and creepage distances for insulating encased meter of protective
class II.26
Table 6 – Voltage marking .30
Table 7 – Upper and lower temperature limits .31
Table 8 – Preferred upper and lower temperature limits corresponding to IEC
environmental classes.32
Table 9 – Relative humidity.32
Table 10 – Voltage range .34
1 Scope
This European Standard applies to newly manufactured watt-hour meters, measuring active electrical
energy, intended for residential, commercial and light industrial use, for use on 50 Hz electrical
networks. It specifies general requirements and type tests methods.
It applies to electromechanical or static watt-hour meters for indoor and outdoor application, consisting
of a measuring element and register(s) enclosed in a meter case. It also applies to operation
indicator(s) and test output(s).
If the meter has (a) measuring element(s) for more than one type of energy (multi-energy meters), or
when other functional elements, like maximum demand indicators, electronic tariff registers, time
switches, ripple control receivers, data communication interfaces, etc. are enclosed in the meter case
(multi-function meters) then this standard applies only for the active energy metering part.
This standard distinguishes between:
– electromechanical and static meters;
– meters of class indexes A, B and C;
– direct connected and transformer operated meters;
– protective class I and protective class II meters;
– meters intended to be used indoors and outdoors.
It does not apply to:
– watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line
voltage for meters for polyphase systems);
– portable meters;
– reference meters.
For rack-mounted meters, the mechanical properties are not covered in this standard.
The test levels are regarded as minimum values to guarantee the proper functioning of the meter
under normal working conditions. For special applications, other test levels might be necessary and
should be agreed on between the user and the manufacturer.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
Publication Year Title
EN 50470-2 2006 Electricity metering equipment (a.c.) – Particular requirements –
Part 2: Electromechanical meters for active energy (class indexes A
and B)
EN 50470-3 2006 Electricity metering equipment (a.c.) – Particular requirements –
Part 3: Static meters for active energy (class indexes A, B and C)
EN 55022 2006 Information technology equipment – Radio disturbance characteristics
– Limits and methods of measurement (CISPR 22:2005, mod.)
EN 60044-1 1999 Instrument transformers – Part 1: Current transformers
+ A1 2000 (IEC 60044-1:1996, mod. + A1:2000 + A2:2002)
+ A2 2003
– 7 – EN 50470-1:2006
Publication Year Title
EN 60044-2 1999 Instrument transformers – Part 2: Inductive voltage transformers
+ A1 2000 (IEC 60044-2:1997, mod. + A1:2000 + A2:2002)
+ A2 2003
Environmental testing – Part 2: Tests – Tests A: Cold
EN 60068-2-1 1993
+ A1 1993 (IEC 60068-2-1:1990 + A1:1993 + A2:1994)
+ A2 1994
EN 60068-2-2 1974 Environmental testing – Part 2: Tests – Tests B: Dry heat
+ A1 1993 (IEC 60068-2-2:1974 + IEC 60068-2-2A:1976 + A1:1993 + A2:1994)
+ A2 1994
EN 60068-2-5 1999 Environmental testing – Part 2: Tests – Test Sa: Simulated solar
radiation at ground level (IEC 60068-2-5:1975)
EN 60068-2-6 1995 Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)
(IEC 60068-2-6:1995 + corrigendum Mar. 1995)
Environmental testing – Part 2: Tests – Test Ka: Salt mist
EN 60068-2-11 1999
(IEC 60068-2-11:1981)
EN 60068-2-27 1993 Environmental testing – Part 2: Tests – Test Ea and guidance: Shock
(IEC 60068-2-27:1987)
EN 60068-2-30 1999 Environmental testing – Part 2: Tests – Test Db and guidance: Damp
heat, cyclic (12 + 12-hour cycle) (IEC 60068-2-30:1980 + A1:1985)
Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
EN 60068-2-75 1997
(IEC 60068-2-75:1997)
Electrical insulation – Thermal classification (IEC 60085:2004)
EN 60085 2004
EN 60359 2002 Electrical and electronic measurement equipment – Expression of
performance (IEC 60359:2001)
EN 60529 1991 Degrees of protection provided by enclosures (IP Code)
+ A1 2000 (IEC 60529:1989 + A1:1999)
EN 60695-2-10 2001 Fire hazard testing – Part 2-10: Glowing/hot-wire based test
methods – Glow-wire apparatus and common test procedure
(IEC 60695-2-10:2000)
EN 60695-2-11 2001 Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
(IEC 60695-2-11:2000)
EN 60721-3-1 1997 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 1:
Storage (IEC 60721-3-1:1997)
EN 60721-3-2 1997 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 2:
Transportation (IEC 60721-3-2:1997)
EN 60721-3-3 1995 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 3:
Stationary use at weatherprotected locations (IEC 60721-3-3:1994)
Electromagnetic compatibility (EMC) – Part 4-1: Testing and
EN 61000-4-1 2000
measurement techniques – Overview of IEC 61000-4 series
(IEC 61000-4-1:2000)
EN 61000-4-2 1995 Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
+ A1 1998
+ A2 2001 (IEC 61000-4-2:1995 + A1:1998 + A2:2000)
EN 61000-4-3 2002 Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency,
electromagnetic field immunity test (IEC 61000-4-3:2002)
Publication Year Title
EN 61000-4-4 2004 Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
(IEC 61000-4-4:2004)
EN 61000-4-5 1995 Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test (IEC 61000-4-5:1995)
EN 61000-4-8 1993 Electromagnetic compatibility (EMC) – Part 4-8: Testing and
+ A1 2001 measurement techniques – Power frequency magnetic field immunity
test (IEC 61000-4-8:1993 + A1:2000)
EN 61000-4-11 2004 Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and
voltage variations immunity tests (IEC 61000-4-11:2004)
EN 61000-4-12 1995 Electromagnetic compatibility (EMC) – Part 4-12: Testing and
+ A1 2001 measurement techniques – Oscillatory waves immunity test
(IEC 61000-4-12:1995 + A1:2000)
EN 62052-11 2003 Electricity metering equipment (a.c.) – General requirements, tests
and test conditions – Part 11: Metering equipment
(IEC 62052-11:2003)
EN 62053-31 1998 Electricity metering equipment (a.c.) – Particular requirements –
Part 31: Pulse output devices for electromechanical and electronic
meters (two wires only) (IEC 62053-31:1998)
EN 62053-52 2005 Electricity metering equipment (a.c.) – Particular requirements –
Part 52: Symbols (IEC 62053-52:2005)
EN ISO 75-2 1996 Plastics – Determination of temperature of deflection under load –
Part 2: Plastic and ebonite (ISO 75-2:1993)
HD 588.1 S1 1991 High-voltage test techniques – Part 1: General definitions and test
requirements (IEC 60060-1:1989 + corrigendum Mar. 1990)
1)
IEC 60038 1983 IEC standard voltages
+ A1 1994
+ A2 1997
International Electrotechnical Vocabulary – Electrical and electronic
IEC 60050-300 2001
measurements and measuring instruments –
Part 311: General terms relating to measurements –
Part 312: General terms relating to electrical measurements –
Part 313: Types of electrical measuring instruments –
Part 314: Specific terms according to the type of instrument
2)
IEC 60417-DB 2002 Graphical symbols for use on equipment
IEC 61000-4-6 2003 Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances,
+ A1 2004
induced by radio-frequency fields
ISO/IEC VIM 1993 International vocabulary of basic and general terms in metrology
———————
1)
IEC 60038:1983 (mod.) without its amendments is harmonized as HD 472 S1:1989 "Nominal voltages for low-voltage public
electricity supply systems".
2)
“DB” refers to the IEC on-line database.
– 9 – EN 50470-1:2006
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Expressions of the performance of electrical and electronic measuring equipment have been taken
from EN 60359.
Where there is a difference between the definitions in this glossary and those contained in product
standards produced by TC 13, then the latter shall take precedence in applications of the relevant
standard.
3.1 General definitions
3.1.1
electromechanical meter
meter in which currents in fixed coils react with the currents induced in the conducting moving
element, generally (a) disk(s), which causes their movement proportional to the energy to be
measured [EN 62052-11, 3.1.1]
3.1.2
static meter
meter in which current and voltage act on solid state (electronic) elements to produce an output
proportional to the energy to be measured [EN 62052-11, 3.1.2]
3.1.3
watt-hour meter
active energy meter
instrument intended to measure active energy by integrating active power with respect to time
[IEV 313-06-01]
3.1.4
direct connected meter
meter intended for use by direct connection to the electricity supply
3.1.5
transformer operated meter
meter intended for use by connection via one or more external instrument transformers to the
electricity supply
3.1.6
active power
under periodic conditions, mean value, taken over one period T, of the instantaneous power p
T
P = p ⋅dt
∫
T
NOTE 1 Under sinusoidal conditions, the active power is the real part of the complex power.
NOTE 2 The SI unit for active power is the watt.
[IEV 131-11-42]
3.1.7
apparent power
product of the r.m.s. voltage U between the terminals of a two-terminal element or two-terminal circuit
and the r.m.s. electric current I in the element or circuit:
S =U ⋅I
NOTE 1 Under sinusoidal conditions, the apparent power is the modulus of the complex power.
NOTE 2 The SI unit for apparent power is the volt-ampere.
[IEV 131-11-41]
3.1.8
active energy
the electrical energy transformable into some other form of energy [IEV 601-01-19]
3.1.9
power factor
under periodic conditions, ratio of the absolute value of the active power P to the apparent power S
P
λ =
S
NOTE Under sinusoidal conditions, the power factor is the absolute value of the active factor.
[IEV 131-11-46]
3.1.10
multi-rate meter
energy meter provided with a number of registers, each becoming operative for specified time
intervals corresponding to different tariff rates [IEV 313-06-09 modified]
3.1.11
meter type (for electromechanical meter)
a particular design of meter, manufactured by one manufacturer, having:
a) similar metrological properties;
b) the same uniform construction of parts determining these properties;
c) the same ratio of the maximum current to the reference current;
d) the same number of ampere-turns for the current winding at reference current and the same
number of turns per volt for the voltage winding at reference voltage.
The type may have several values of reference current and reference voltage.
Meters are designated by the manufacturer by one or more groups of letters or numbers, or a
combination of letters and numbers. Each type has one designation only.
NOTE 1 The type is represented by the sample meter(s) intended for the type tests, whose characteristics (reference current
and reference voltage) are chosen from the values given in the tables proposed by the manufacturer.
NOTE 2 Where the number of ampere-turns would lead to a number of turns other than a whole number, the product of the
number of turns of the windings by the value of the reference current may differ from that of the sample meter(s) representative
of the type.
It is advisable to choose the next number immediately above or below in order to have whole numbers of turns.
For this reason only may the number of turns per volt of the voltage windings differ, but by not more than 20 % from that of the
sample meters representative of the type.
NOTE 3 The ratio of the highest to the lowest reference speed of the rotors of each of the meters of the same type shall not
exceed 1,5.
[EN 62052-11, 3.1.8.1 modified]
– 11 – EN 50470-1:2006
3.1.12
meter type (for static meter)
a particular design of meter, manufactured by one manufacturer, having:
a) similar metrological properties;
b) the same uniform construction of parts (hardware and software) determining these properties;
c) the same ratio of the maximum current to the reference current.
The type may have several values of reference current and reference voltage.
Meters are designated by the manufacturer by one or more groups of letters or numbers, or a
combination of letters and numbers. Each type has one designation only.
NOTE 1 The type is represented by the sample meter(s) intended for the type tests, whose characteristics (reference current
and reference voltage) are chosen from the values given in the tables proposed by the manufacturer.
NOTE 2 A specific meter design with identical elements in the current circuit may be suitable for more than one current range.
[EN 62052-11, 3.1.8.2 modified]
3.1.13
reference meter
a meter used to measure the unit of electric energy. It is usually designed and operated to obtain the
highest accuracy and stability in a controlled laboratory environment [EN 62052-11, 3.1.9]
3.2 Definitions related to the functional elements
3.2.1
metrologically relevant
a function or property of the meter, subject to control by a legal metrology body
3.2.2
measuring element
part of the meter which produces an output proportional to the energy [EN 62052-11, 3.2.1]
3.2.3
test output device (of an energy meter)
device which can be used for determining the meter error
NOTE This device can be, for electromechanical induction meters, a mark on the disk, where the passage of the mark is
detected by an external photoelectric device, or, for static meters, an internal electronic pulse output device.
[IEV 314-07-12 modified]
3.2.4
operation indicator
device which gives a visible signal of the operation of the meter [IEV 314-07-13]
3.2.5
pulse
wave that departs from an initial level for a limited duration of time and ultimately returns to the original
level [EN 62052-11, 3.2.2.3]
3.2.6
pulse device (for electricity metering)
functional unit for emitting, transmitting, retransmitting or receiving pulses, representing finite
quantities, such as energy units [EN 62052-11, 3.2.2.4 modified]
3.2.7
pulse output device
pulse output
pulse device for emitting pulses [EN 62052-11, 3.2.2.5]
3.2.8
optical test output
optical pulse output device that is used for testing the meter [EN 62052-11, 3.2.2.6]
3.2.9
electrical test output
electrical pulse output device that is used for testing the meter [EN 62052-11, 3.2.2.7]
3.2.10
receiving head
functional unit for receiving pulses emitted by an optical pulse output [EN 62052-11, 3.2.2.8]
3.2.11
memory (for static meters)
element which stores digital information [IEV 314-07-10 modified]
3.2.12
non-volatile memory
memory which can retain information in the absence of power [EN 62052-11, 3.2.3.1]
3.2.13
display
device which displays the content(s) of (a) memory(ies) [IEV 314-07-11]
3.2.14
register
the part of the meter which enables the measured value to be determined
NOTE It can be an electromechanical device or an electronic device comprising both memory and display which stores and
displays information. A single electronic display may be used with multiple electronic memories to form multiple electronic
registers.
[IEV 314-07-09 modified]
3.2.15
current circuit
internal connections of the meter and part of the measuring element through which flows the current of
the circuit to which the meter is connected [EN 62052-11, 3.2.6]
3.2.16
voltage circuit
internal connections of the meter, part of the measuring element and in the case of static meters, part
of the power supply, supplied with the voltage of the circuit to which the meter is connected
[EN 62052-11, 3.2.7]
3.2.17
auxiliary device
a device within the meter intended to perform a particular function additional to the basic metrology
function, like tariff- and load control, or reception or transmission of data
3.2.18
auxiliary circuit
elements and connections of an auxiliary device within the meter case intended to be connected to an
external device [EN 62052-11, 3.2.8 modified]
– 13 – EN 50470-1:2006
3.2.19
constant (for electromechanical watt-hour meters)
value expressing the relation between the energy registered by the meter and the corresponding
number of revolutions of the rotor for example, either in revolutions per kilowatt-hour (rev/kWh) or watt-
hours per revolution (Wh/rev) [EN 62052-11, 3.2.9.1]
3.2.20
constant (for static watt-hour meters)
value expressing the relation between the energy registered by the meter and the corresponding value
of the test output
NOTE If this value is a number of pulses, the constant should be either pulses per kilowatt-hour (imp/kWh) or watt-hours per
pulse (Wh/imp)
[IEV 314-07-08 modified]
3.3 Definitions of mechanical elements
3.3.1
indoor meter
meter which can only be used in areas offering additional protection against environmental influences
(e.g. in a house or in a cabinet) [IEV 314-07-20]
3.3.2
outdoor meter
meter which can be used without additional protection in an exposed environment [IEV 314-07-21]
3.3.3
base
back of the meter by which it is generally fixed and to which are attached the measuring element(s),
the terminals or the terminal block, and the cover
NOTE For a flush-mounted meter, the meter base may include the sides of the case.
[IEV 314-07-14 modified]
3.3.4
socket
base with jaws to accommodate terminals of a detachable meter and which has terminals for
connection to the supply line. It may be a single-position socket for one meter or a multiple-position
socket for two or more meters [IEV 314-07-15 modified]
3.3.5
cover
enclosure on the front of the meter, made either wholly of transparent material or of opaque material
provided with window(s) through which the operation indicator (if fitted) and the display can be read
[IEV 314-07-16]
3.3.6
case
set that comprises the base and the cover [IEV 314-07-17]
3.3.7
accessible conductive part
conductive part which can be touched by the standard test finger, when the meter is installed and
ready for use [IEV 442-01-15 modified]
3.3.8
protective earthing
earthing a point or points in a system or in an installation or in equipment, for purposes of electrical
safety [IEV 195-01-11]
3.3.9
protective earth terminal
terminal connected to accessible conductive parts of a meter for safety purposes [EN 62052-11, 3.3.7]
3.3.10
terminal block
support made of insulating material on which all or some of the terminals of the meter are grouped
together [IEV 314-07-18]
3.3.11
terminal cover
cover which covers the meter terminals and, generally, the ends of the external wires or cables
connected to the terminals [IEV 314-07-19 modified]
3.4 Definitions related to insulation
3.4.1
clearance
the shortest distance through air between two conductive parts [IEV 604-03-60 modified]
3.4.2
creepage distance
the shortest distance along the surface of a solid insulating material between two conductive parts
[IEV 604-03-61]
3.4.3
hazardous-live-part
live part which, under certain conditions, can give a harmful electric shock [IEV 195-06-05]
3.4.4
basic insulation
insulation of hazardous-live-parts which provides basic protection
NOTE This concept does not apply to insulation used exclusively for functional purposes.
[IEV 195-06-06]
3.4.5
supplementary insulation
independent insulation applied in addition to basic insulation, for fault protection [IEV 195-06-07]
3.4.6
double insulation
insulation comprising both basic insulation and supplementary insulation [IEV 195-06-08]
3.4.7
reinforced insulation
insulation of hazardous-live-parts which provides a degree of protection against electric shock
equivalent to double insulation
NOTE Reinforced insulation may comprise several layers, which cannot be tested singly as basic insulation or supplementary
insulation.
[IEV 195-06-09]
– 15 – EN 50470-1:2006
3.4.8
insulating encased meter of protective class I
meter in which protection against electric shock does not rely on basic insulation only but which
includes an additional safety precaution in that accessible conductive parts are connected to the
protective earthing conductor in the fixed wiring of the installation in such a way that accessible
conductive parts cannot become live in the event of a failure of the basic insulation
NOTE This provision includes a protective earth terminal.
[EN 62052-11, 3.4.5]
3.4.9
insulating encased meter of protective class II
meter with a case of insulating material in which protection against electric shock does not rely on
basic insulation only, but in which additional safety precautions, such as double insulation or
reinforced insulation, are provided, there being no provision for protective earthing or reliance upon
installation conditions
[EN 62052-11, 3.4.6]
3.5 Definitions of meter quantities
3.5.1
measurand
particular quantity subject to measurement [VIM 2.6] [IEV 311-01-03]
3.5.2
3)
current (I)
the electrical current flowing through the meter
3.5.3
3)
starting current (I )
st
the lowest value of the current at which the meter is declared to register active electrical energy at
unity power factor (polyphase meters with balanced load)
3.5.4
3)
minimum current (I )
min
the lowest value of the current at which this European Standard specifies accuracy requirements. At
and above I , up to I relaxed accuracy requirements apply
min tr
3.5.5
3)
transitional current (I )
tr
the value of the current at, and above which, up to I full accuracy requirements of this European
max
Standard apply
3.5.6
3)
reference current (I )
ref
– for direct connected meters, 10 times the transitional current
NOTE 1 This value is the same as basic current, I defined in EN 62052-11, 3.5.1.2.
b
– for current transformer operated meters, 20 times the transitional current
NOTE 2 This value is the same as rated current, I .
n
———————
3)
The terms "voltage" and "current" indicate r.m.s. values unless otherwise specified.
3.5.7
3)
rated current (I )
n
in case of a transformer operated meter, the value of the current for which the meter has been
designed
NOTE In case of transformer operated meters, the terms “reference current” and “rated current” are synonymous
3.5.8
3)
maximum current (I )
max
highest value of current at which the meter purports to meet the accuracy requirements of this
European Standard [EN 62052-11, 3.5.2]
3.5.9
3)
voltage (U)
the voltage of the circuit to which the meter is connected
3.5.10
3)
reference voltage (U )
n
value of the voltage in accordance with which the relevant performance of the meter is fixed
NOTE The reference voltage can take more than one value.
[EN 62052-11, 3.5.3 modified]
3.5.11
frequency (f)
the frequency in the circuit to which the meter is connected
3.5.12
reference frequency (f )
n
value of the frequency in accordance with which the relevant performance of the meter is fixed
[EN 62052-11, 3.5.4]
3.5.13
measuring range
range defined by two values of the measurand, within which the limits of the error of the meter are
specified [≠ VIM 5.4]
NOTE An instrument can have several measuring ranges.
[IEV 311-03-12 modified]
3.5.14
class index
a designation that identifies:
– the set of limits of percentage error at reference conditions, additional percentage error due to
influence quantities and maximum permissible error at rated operating conditions the meter shall
comply with;
– the set of critical change values caused by long term disturbances the meter shall comply with.
NOTE A meter may be assigned to different class indexes for different rated operating conditions.
– 17 – EN 50470-1:2006
3.5.15
percentage error
percentage error is given by the following formula:
energy registered by the meter −true energy
percentage error = × 100
true energy
NOTE Since the true value cannot be determined, it is approximated by a value with a stated uncertainty that can be traced to
standards agreed upon between manufacturer and user or to national standards.
[EN 62052-11, 3.5.7]
3.5.16
intrinsic error
percentage error of a meter when used under reference conditions [≠ VIM 5.24]
NOTE This term is used in the "true value" approach.
[IEV 311-03-08 modified]
3.5.17
additional percentage error due to an influence quantity
additional percentage error of the meter compared to the intrinsic error for the same measurand,
when only one influence quantity assumes two specified values, one of them being the reference
value [IEV 311-07-03 modified]
3.5.18
composite error
percentage error calculated from the measured values of the intrinsic error and the additional
percentage error due to influence quantities
NOTE For the influence quantities to be considered, and the calculation of composite error, see the relevant standard for
particular requirements.
3.5.19
maximum permissible error (MPE)
extreme values of the composite error permitted by this European Standard [VIM 5.21 modified]
3.5.20
repeatability
closeness of the agreement between the results of successive measurements of the same measurand
carried out under the same conditions of measurement
NOTE 1 These conditions are called repeatability conditions.
NOTE 2 Repeatability conditions include:
– the same measurement procedure;
– the same observer;
– the same measuring instrument, used under the same conditions;
– the same location;
– repetition over a short period.
[VIM 3.6 modified]
3.6 Definitions of influence quantities
3.6.1
influence quantity
any quantity, generally external to the meter, which may affect its working performance
[IEV 311-06-01 modified
...
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