Electricity metering equipment (a.c.) - Particular requirements - Part 24: Static meters for fundamental component reactive energy (classes 0,5 S, 1S and 1)

This part of IEC 62053 applies only to newly manufactured transformer operated static varhour
meters of accuracy classes 0,5 S, and 1 S as well as direct connected static var-hour
meters of accuracy class 1, for the measurement of alternating current electrical reactive
energy in 50 Hz or 60 Hz networks and it applies to their type tests only.
This standard uses a conventional definition of reactive energy where the reactive power and
energy is calculated from the fundamental frequency components of the currents and voltages
only. See Clause 3.
NOTE 1 This differs from the approach of IEC 62053-23, where reactive power and energy is defined only for
sinusoidal signals. In this standard reactive power and energy is defined for all periodic signals. Reactive power
and energy is defined in this way to achieve proper reproducibility of measurements with meters of different
designs. With this definition, reactive power and energy reflects the generally unnecessary current possible to
compensate with capacitors rather than the total unnecessary current.
It applies only to static var-hour meters for indoor and outdoor application consisting of a
measuring element and register(s) enclosed together in a meter case. It also applies to
operation indicator(s) and test output(s). If the meter has a measuring element 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, then the relevant standards
for these elements also apply.
NOTE 2 IEC 61869-2:2012 describes transformers having a measuring range of 0,05 In to Imax for accuracy
classes 0,2, 0,5, 1 and 2, and transformers having a measuring range of 0,01 In to Imax for accuracy classes 0,2 S
and 0,5 S. As the measuring range of a meter and its associated transformers have to be matched and as only
transformers of classes 0,2 S / 0,5 S have the current error and phase displacement characteristics suitable to
operate a class 0,5 S / 1 S meter respectively as specified in this standard, the measuring range of the transformer
operated meters will be 0,01 In to Imax. Reactive meters intended to be used together with non-S transformers are,
therefore, not covered by this standard.

Wechselstrom-Elektrizitätszähler - Besondere Anforderungen - Teil 24: Elektronische Grundschwingungs-Blindverbrauchszähler der Genauigkeitsklassen 0,5 S, 1 S und 1

Équipement de comptage de l’électricité (ca) - Exigences particulieres - Partie 24: Compteurs statiques pour la composante fondamentale de l’énergie réactive (classes 0,5 S, 1S et 1)

L'IEC 62053-24:2014 est applicable uniquement aux compteurs d'énergie réactive statiques neufs des classes de précision 0,5 S et 1 S alimentés par transformateurs ainsi qu'aux compteurs d'énergie réactive statiques neufs à branchement direct de classe de précision 1, destinés à la mesure de l'énergie électrique réactive en courant alternatif sur les réseaux électriques en 50 Hz et 60 Hz, et à leurs essais de type. Elle est fondée sur une définition conventionnelle de l'énergie réactive pour laquelle la puissance et l'énergie réactives ne sont calculées qu'à partir des composantes de fréquence fondamentale des courants et des tensions.

Oprema za merjenje električne energije (izmenični tok) - Posebne zahteve - 24. del: Statični števci osnovne komponente jalove energije (razredi 0,5 S, 1 S in 1) (IEC 62053-24:2014)

Ta del standarda IEC 62053 se uporablja le za novo proizvedene transformatorske statične števce jalove energije razredov natančnosti 0,5 S in 1 S ter neposredno povezane statične števce jalove energije razreda natančnosti 1 za merjenje jalove električne energije pri izmeničnem toku v omrežju 50 Hz ali 60 Hz ter se uporablja le za tipsko preskušanje teh števcev. V tem standardu se uporablja konvencionalna opredelitev jalove energije, kadar se jalova moč in energija izračunata le na podlagi komponent osnovnih frekvenc tokov in napetosti. Glej 3. točko.
OPOMBA 1: Ta pristop se razlikuje od pristopa iz standarda IEC 62053-23, kjer sta jalova moč in energija določeni le za sinusne signale. V tem standardu sta jalova moč in energija določeni za vse periodične signale. Jalova moč in energija sta določeni tako, da se doseže ustrezna ponovljivost meritev z različno zasnovanimi števci. Pri tej opredelitvi jalova moč in energija ne odražata skupnega nepotrebnega toka, ampak splošno nepotreben tok, ki ga je mogoče nadomestiti s kondenzatorji.
Uporablja se le za statične števce jalove energije za notranjo in zunanjo montažo, sestavljene iz merilnega elementa in zapisovalnika, priloženega v merilnem ohišju. Uporablja se tudi kot indikator obratovanja in preskusni izhod. Če ima števec merilni element za več vrst energije (multi energijski števci) ali če so drugi funkcionalni elementi, kot so indikatorji maksimuma, elektronski tarifni registri, časovna stikala, kontrolni prejemniki nihanj, podatkovni komunikacijski vmesniki itd., priloženi v merilno ohišje, se uporabljajo tudi ustrezni standardi za te elemente.
OPOMBA 2: V standardu IEC 61869-2:2012 so opisani transformatorji z merilnim obsegom 0,05 In do Imaks. za razrede natančnosti 0,2, 0,5, 1 in 2 ter transformatorji z merilnim obsegom 0,01 In do Imaks. za razreda natančnosti 0,2 S in 0,5 S. Ker se morata merilni obseg števca in z njim povezanih transformatorjev ujemati in ker imajo le transformatorji razreda 0,2 S/0,5 S značilnosti tokovnega pogreška in faznega pogreška, primerne za delovanje števca razreda 0,5 S/1 S, kot je opredeljeno v tem standardu, bo merilni obseg transformatorskih števcev 0,01 In do Imaks. Števci jalove energije, ki naj bi se uporabljali s transformatorji, ki niso razreda S, zato niso zajeti v tem standardu.

General Information

Status
Published
Publication Date
15-Mar-2015
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
28-Jan-2015
Due Date
04-Apr-2015
Completion Date
16-Mar-2015

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Équipement de comptage de l’électricité (ca) - Exigences particulieres - Partie 24: Compteurs statiques pour la composante fondamentale de l’énergie réactive (classes 0,5 S, 1S et 1)Electricity metering equipment (a.c.) - Particular requirements - Part 24: Static meters for fundamental component reactive energy (classes 0,5 S, 1S and 1)91.140.50Sistemi za oskrbo z elektrikoElectricity supply systems17.220.20Measurement of electrical and magnetic quantitiesICS:Ta slovenski standard je istoveten z:EN 62053-24:2015SIST EN 62053-24:2015en01-april-2015SIST EN 62053-24:2015SLOVENSKI

STANDARD
SIST EN 62053-24:2015
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 62053-24
January 2015 ICS 17.220.20; 91.140.50
English Version

Electricity metering equipment (a.c.) - Particular requirements - Part 24: Static meters for reactive energy at fundamental frequency (classes 0,5 S, 1 S and 1) (IEC 62053-24:2014)

Équipement de comptage de l'électricité (c.a.) - Exigences particulières - Partie 24: Compteurs statiques d'énergie réactive à la fréquence fondamentale

(classes 0,5 S, 1 S et 1) (IEC 62053-24:2014)

Wechselstrom-Elektrizitätszähler - Besondere Anforderungen - Teil 24: Elektronische Grundschwingungs-Blindverbrauchszähler

der Genauigkeitsklassen 0,5 S, 1 S und 1 (IEC 62053-24:2014) This European Standard was approved by CENELEC on 2014-07-24. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17,

B-1000 Brussels © 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 62053-24:2015 E SIST EN 62053-24:2015

EN 62053-24:2015 - 2 - Foreword The text of document 13/1569/FDIS, future edition 1 of IEC 62053-24, prepared by IEC/TC 13 "Electrical energy measurement and control" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 62053-24:2015.

The following dates are fixed: • latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2015-07-16 • latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2017-07-24

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

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.

For the relationship with EU Directive see informative Annex ZZ, which is an integral part of this document.

Endorsement notice The text of the International Standard IEC 62053-24:2014 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 61869-2:2012 NOTE Harmonized as EN 61869-2:2012 (not modified). IEC 62053-21:2003 NOTE Harmonized as EN 62053-21:2003 (not modified). IEC 62053-23:2003 NOTE Harmonized as EN 62053-23:2003 (not modified). IEC 62053-61:1998 NOTE Harmonized as EN 62053-61:1998 (not modified). SIST EN 62053-24:2015

- 3 - EN 62053-24:2015 Annex ZA (normative)

Normative references to international publications with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu

Publication Year Title EN/HD Year
IEC 62052-11 2003

Electricity metering equipment (AC) - General requirements, tests and test conditions -

Part 11: Metering equipment EN 62052-11 2003
SIST EN 62053-24:2015
EN 62053-24:2015 - 4 - Annex ZZ (informative)
Coverage of Essential Requirements of EU Directives

This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope this standard covers all relevant essential requirements as given in Annex I of the EU Directive 2004/108/EC.

Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned.

WARNING: Other requirements and other EU Directives can be applied to the products falling within the scope of this standard.

SIST EN 62053-24:2015

IEC 62053-24 Edition 1.0 2014-06 INTERNATIONAL STANDARD NORME INTERNATIONALE Electricity metering equipment (a.c.) – Particular requirements – Part 24: Static meters for reactive energy at fundamental frequency (classes 0,5 S, 1 S and 1)

Équipement de comptage de l’électricité (c.a.) – Exigences particulières –

Partie 24: Compteurs statiques d’énergie réactive à la fréquence fondamentale (classes 0,5 S, 1 S et 1)

INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 17.220.20; 91.140.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1560-9

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ®

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé. SIST EN 62053-24:2015

– 2 – IEC 62053-24:2014 © IEC 2014 CONTENTS

FOREWORD ........................................................................................................................... 4 INTRODUCTION ..................................................................................................................... 6 1 Scope .............................................................................................................................. 7 2 Normative references ...................................................................................................... 7 3 Terms and definitions ...................................................................................................... 8 4 Standard electrical values ............................................................................................... 8 5 Mechanical requirements ................................................................................................. 8 6 Climatic conditions .......................................................................................................... 8 7 Electrical requirements .................................................................................................... 8 7.1 General ................................................................................................................... 8 7.2 Power consumption................................................................................................. 9

General ........................................................................................................... 9 7.2.1 Voltage circuits ................................................................................................ 9 7.2.2 Current circuits ................................................................................................ 9 7.2.37.3 Influence of short-time overcurrents ........................................................................ 9 7.4 Influence of self-heating ........................................................................................ 10 7.5 AC voltage test ..................................................................................................... 11 8 Accuracy requirements .................................................................................................. 11 8.1 General ................................................................................................................. 11 8.2 Limits of error due to variation of the current ......................................................... 11 8.3 Limits of error due to influence quantities .............................................................. 12

General ......................................................................................................... 12 8.3.1 Tests of the influence of DC and even harmonics in the current circuit .......... 14 8.3.2 Continuous magnetic induction of external origin ........................................... 14 8.3.3 Harmonics ..................................................................................................... 14 8.3.48.4 Test of starting and no-load condition ................................................................... 15

General ......................................................................................................... 15 8.4.1 Initial start-up of the meter ............................................................................. 15 8.4.2 Test of no-load condition ............................................................................... 15 8.4.3 Starting.......................................................................................................... 16 8.4.48.5 Meter constant ...................................................................................................... 16 8.6 Accuracy test conditions ....................................................................................... 16 8.7 Interpretation of test results .................................................................................. 17

(normative)

Test circuit diagram for DC and even harmonics ................................. 18 Annex A (normative)

Electromagnet for testing the influence

of externally produced Annex Bmagnetic fields ..................................................................................................................... 20

(informative)

Geometric representation of active and reactive power ..................... 21 Annex C (informative)

Effect of phase displacement ............................................................ 23 Annex DD.1 Phase displacement and matching of current transformers and meters for reactive energy ..................................................................................................... 23

(informative)

Treatment of harmonics and tests for harmonics ............................... 24 Annex EE.1 Non-sinusoidal conditions and reactive power definition ........................................ 24 E.2 Tests for accuracy under non-sinusoidal conditions .............................................. 24 E.3 Fifth harmonic test ................................................................................................ 25 Bibliography .......................................................................................................................... 26 SIST EN 62053-24:2015

IEC 62053-24:2014 © IEC 2014 – 3 –

Figure A.1 – Test circuit diagram for half-wave rectification .................................................. 18 Figure A.2 – Half-wave rectified waveform ............................................................................ 19 Figure B.1 – Electromagnet for testing the influence

of externally produced magnetic fields..................................................................................................................................... 20 Figure C.1 – Recommended geometric representation .......................................................... 21 Figure C.2 – Alternative geometric representation ................................................................ 22

Table 1 – Power consumption in voltage circuits for single-phase

and polyphase meters including the power supply .......................................................................................... 9 Table 2 – Power consumption in current circuits ..................................................................... 9 Table 3 – Variations due to short-time overcurrents .............................................................. 10 Table 4 – Variations due to self-heating ................................................................................ 10 Table 5 – AC voltage tests .................................................................................................... 11 Table 6 – Percentage error limits (single-phase meters

and polyphase meters with balanced loads) .................................................................................................................... 12 Table 7 – Percentage error limits (polyphase meters carrying a single-phase load,

but with balanced polyphase voltages applied to voltage circuits) ............................................... 12 Table 8 – Influence quantities ............................................................................................... 13 Table 9 – Starting current ..................................................................................................... 16 Table 10 – Voltage and current balance ................................................................................ 16 Table 11 – Reference conditions ........................................................................................... 17 Table 12 – Interpretation of test results ................................................................................. 17 Table D.1 – Limits of phase displacement for measuring current transformers

and corresponding measurement error for reactive energy measurement .................................... 23

SIST EN 62053-24:2015

– 4 – IEC 62053-24:2014 © IEC 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________

ELECTRICITY METERING EQUIPMENT (a.c.) –
PARTICULAR REQUIREMENTS –

Part 24: Static meters for reactive energy at fundamental frequency (classes 0,5 S, 1 S and 1)

FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62053-24 has been prepared by IEC technical committee 13: Electrical energy measurement and control. The text of this standard is based on the following documents: FDIS Report on voting 13/1569/FDIS 13/1578/RVD

Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. SIST EN 62053-24:2015

IEC 62053-24:2014 © IEC 2014 – 5 – A list of all parts of IEC series 62053, under the general title Electricity metering equipment (a.c.) – Particular requirements, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication will be

• reconfirmed, • withdrawn, • replaced by a revised edition, or • amended.
SIST EN 62053-24:2015

– 6 – IEC 62053-24:2014 © IEC 2014 INTRODUCTION This part of IEC 62053 is to be used with the following relevant parts of the IEC 62052, IEC 62053 and IEC 62059 series, Electricity metering equipment:

IEC 62052-11:2003, Electricity metering equipment (a.c.) – General requirements, tests and test conditions – Part 11: Metering equipment IEC 62053-21:2003, Electricity metering equipment (a.c.) – Particular requirements – Part 21: Static meters for active energy (classes 1 and 2) IEC 62053-22:2003, Electricity metering equipment (a.c.) – Particular requirements – Part 22: Static meters for active energy (classes 0,2 S and 0,5 S) IEC 62053-31:1998, Electricity metering equipment (a.c.) – Particular requirements – Part 31: Pulse output devices for electromechanical and electronic meters (two wires only) IEC 62053-52:2005, Electricity metering equipment (a.c.) – Particular requirements – Part 52: Symbols IEC 62053-61:1998, Electricity metering equipment (a.c.) – Particular requirements – Part 61: Power consumption and voltage requirements IEC 62059-11:2002, Electricity metering equipment (a.c.) – Dependability – Part 11: General concepts IEC 62059-21:2002, Electricity metering equipment (a.c.) – Dependability – Part 21: Collection of meter dependability data from the field IEC 62059-31-1:2008, Electricity metering equipment – Dependability –Part 31-1: Accelerated reliability testing – Elevated temperature and humidity IEC 62059-32-1:2011, Electricity metering equipment – Dependability – Part 32-1: Durability – Testing of the stability of metrological characteristics by applying elevated temperature IEC 62059-41:2006, Electricity metering equipment – Dependability – Part 41: Reliability prediction This part is a standard for type testing electricity meters. It covers the particular requirements for meters, used indoors and outdoors. It does not deal with special implementations (such as metering-part and/or displays in separate housings). This standard is intended to be used in conjunction with IEC 62052-11. When any requirement in this standard concerns an item already covered in IEC 62052-11, the requirements of this standard take precedence over the requirements of IEC 62052-11. This standard distinguishes: • between transformer operated meters of accuracy class index 0,5 S and 1 S and direct connected meters of accuracy class index 1; • between protective class I and protective class II meters; • between meters for use in networks equipped with or without earth fault neutralizers. The test levels are regarded as minimum values that provide for the proper functioning of the meter under normal working conditions. For special application, other test levels might be necessary and should be agreed on between the user and the manufacturer. SIST EN 62053-24:2015

IEC 62053-24:2014 © IEC 2014 – 7 – ELECTRICITY METERING EQUIPMENT (a.c.) –
PARTICULAR REQUIREMENTS –
Part 24: Static meters for reactive energy at
fundamental frequency (classes 0,5 S, 1 S and 1)

1 Scope This part of IEC 62053 applies only to newly manufactured transformer operated static var-hour meters of accuracy classes 0,5 S, and 1 S as well as direct connected static var-hour meters of accuracy class 1, for the measurement of alternating current electrical reactive energy in 50 Hz or 60 Hz networks and it applies to their type tests only. This standard uses a conventional definition of reactive energy where the reactive power and energy is calculated from the fundamental frequency components of the currents and voltages only. See Clause 3. NOTE 1 This differs from the approach of IEC 62053-23, where reactive power and energy is defined only for sinusoidal signals. In this standard reactive power and energy is defined for all periodic signals. Reactive power and energy is defined in this way to achieve proper reproducibility of measurements with meters of different designs. With this definition, reactive power and energy reflects the generally unnecessary current possible to compensate with capacitors rather than the total unnecessary current. It applies only to static var-hour meters for indoor and outdoor application consisting of a measuring element and register(s) enclosed together in a meter case. It also applies to operation indicator(s) and test output(s). If the meter has a measuring element 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, then the relevant standards for these elements also apply.

NOTE 2 IEC 61869-2:2012 describes transformers having a measuring range of 0,05 In to Imax for accuracy classes 0,2, 0,5, 1 and 2, and transformers having a measuring range of 0,01 In to Imax for accuracy classes 0,2 S and 0,5 S. As the measuring range of a meter and its associated transformers have to be matched and as only transformers of classes 0,2 S / 0,5 S have the current error and phase displacement characteristics suitable to operate a class 0,5 S / 1 S meter respectively as specified in this standard, the measuring range of the transformer operated meters will be 0,01 In to Imax. Reactive meters intended to be used together with non-S transformers are, therefore, not covered by this standard. It does not apply to: • var-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters for polyphase systems); • portable meters; • data interfaces to the register of the meter; • reference meters. The dependability aspect is covered by the standards of the IEC 62059 series. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. SIST EN 62053-24:2015

– 8 – IEC 62053-24:2014 © IEC 2014 IEC 62052-11:2003, Electricity metering equipment (a.c.) – 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 IEC 62052-11 apply with the following exception: 3.1

reactive power Q reactive power Q in a single phase system is defined for steady-state and periodic signals as

111sinϕ∗∗=IUQ where U1 and I1 are the r.m.s. values of the fundamental frequency components of the voltage and the current respectively, and 31 is the phase angle between them. The reactive power in poly-phase system is the algebraic sum of the per-phase reactive powers: .....sinsin222111+∗∗+∗∗=LLLLLLIUIUQϕϕ where L1 and L2 are the first and second phase of the system. Note 1 to entry: For direction of flow and sign of reactive power, see Annex C. Note 2 to entry: The actual algorithm used for the calculation of reactive power is not of importance as long as the meter meets requirements of this standard. See also Annex E. Note 3 to entry: While meters for active energy have to measure active energy including harmonic components, reactive energy meters according to this standard have to measure fundamental component reactive energy, with minimum influence from harmonics. 4 Standard electrical values The values given in IEC 62052-11 apply. 5 Mechanical requirements The requirements of IEC 62052-11 apply. 6 Climatic conditions The conditions given in IEC 62052-11 apply. 7 Electrical requirements 7.1 General In addition to the electrical requirements in IEC 62052-11, meters shall fulfil the following requirements. SIST EN 62053-24:2015

IEC 62053-24:2014 © IEC 2014 – 9 – 7.2 Power consumption

General 7.2.1The power consumption in the voltage and current circuit shall be determined at reference values of the influence quantities given in 8.6 by any suitable method. The overall uncertainty of the measurement of the power consumption shall not exceed 5 %.

Voltage circuits 7.2.2The active and apparent power consumption in each voltage circuit of a meter at reference voltage, reference temperature and reference frequency shall not exceed the values shown in Table 1. Table 1 – Power consumption in voltage circuits for single-phase

and polyphase meters including the power supply Meters Power supply connected
to the voltage circuits Power supply not connected

to the voltage circuits Voltage circuit 2 W and 10 VA 0,5 VA Auxiliary power supply – 10 VA NOTE 1 In order to match voltage transformers to meters, the meter manufacturer should state whether the burden is inductive or capacitive (for transformer operated meters only). NOTE 2 The above figures are mean values. Switching power supplies with peak values in excess of these specified values are permitted, but it should be ensured that the rating of associated voltage transformers is adequate. NOTE 3 For multifunctional meters, see IEC 62053-61.

Current circuits 7.2.3The apparent power taken by each current circuit of a direct connected meter at basic current, reference frequency and reference temperature shall not exceed the values shown in Table 2. The apparent power taken by each current circuit of a meter connected through a current transformer shall not exceed the value shown in Table 2, at a current value that equals the rated secondary current of the corresponding transformer, at reference temperature and reference frequency of the meter. Table 2 – Power consumption in current circuits Meters Class of meter 0,5 S 1 S 1 Single-phase and polyphase direct connected meter – – 4,0 VA Single-phase and polyphase transformer operated meters 1,0 VA 1,0 VA – NOTE 1 The rated secondary current is the value of the secondary current indicated on the current transformer, on which the performance of the transformer is based. Standard values of maximum secondary current are 120 %, 150 % and 200 % of the rated secondary current. NOTE 2 In order to match current transformers to meters, the meter manufacturer should state whether the burden is inductive or capacitive (for transformer operated meters only).

7.3 Influence of short-time overcurrents Short-time overcurrents shall not damage the meter. The meter shall perform correctly when back to its initial working condition and the variati

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Questions, Comments and Discussion

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