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1、BRITISH STANDARD BS EN 50470-2:2006 Electricity metering equipment (a.c.) Part 2: Particular requirements Electromechanical meters for active energy (class indexes A and B) The European Standard EN 50470-2:2006 has the status of a British Standard ICS 91.140.50 ? BS EN 50470-2:2006 This British Stan
2、dard was published under the authority of the Standards Policy and Strategy Committee on 29 December 2006 BSI 2006 ISBN 0 580 49811 5 National foreword This British Standard was published by BSI. It is the UK implementation of EN 50470-2:2006. The UK participation in its preparation was entrusted to
3、 Technical Committee PEL/13, Electricity meters. A list of organizations represented on PEL/13 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Br
4、itish Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments EUROPEAN STANDARD EN 50470-2 NORME EUROPENNE EUROPISCHE NORM October 2006 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotech
5、nique Europisches Komitee fr 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 50470-2:2006 E ICS 91.140.50 English version Electricity meteri
6、ng equipment (a.c.) Part 2: Particular requirements - Electromechanical meters for active energy (class indexes A and B) Equipement de comptage dlectricit (c.a.) Partie 2: Prescriptions particulires - Compteurs lectromcaniques dnergie active (classes de prcision A et B) Wechselstrom-Elektrizittszhle
7、r Teil 2: Besondere Anforderungen - Elektromechanische Wirkverbrauchszhler der Genauigkeitsklassen A und B 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 Europe
8、an 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 (Engli
9、sh, 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, B
10、elgium, 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. EN 50470-2:2006 2
11、 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 50470-2 on 2006-05-01. The following dates we
12、re 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 50470-2 is related to EN
13、 62053-11:2003, Electricity metering equipment (a.c.) Particular requirements Part 11: Electromechanical meters for active energy (classes 0,5, 1 and 2). The structure of the two standards is similar, modifications in this European Standard are provided in the perspective of compliance with the Esse
14、ntial Requirements of the Directive 2004/22/EC on Measuring Instruments (MID). This standard is to be used with EN 50470-1:2006, Electricity metering equipment (a.c.) Part 1: General requirements, tests and test conditions Metering equipment (class indexes A, B and C). This European Standard has bee
15、n prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive 2004/22/EC. See Annex ZZ. _ 3 EN 50470-2:2006 Contents 1 Scope.5 2 Normative references .5 3 Terms, definitions and abbreviations 5 4 Stand
16、ard electrical values 6 5 Mechanical requirements6 5.1 General.6 5.2 Register (counting mechanism) .6 5.3 Direction of rotation and marking of the rotor.6 6 Climatic conditions .6 7 Electrical requirements.6 7.1 Power consumption.6 7.1.1 Measuring method.6 7.1.2 Voltage circuits7 7.1.3 Current circu
17、its7 7.2 AC voltage test7 8 Accuracy requirements and tests9 8.1 Limits of percentage error due to variation of the load .9 8.2 Repeatability .9 8.3 Limits of additional percentage error due to influence quantities9 8.4 Maximum permissible error (MPE).11 8.5 Effect of disturbances of long duration.1
18、1 8.6 Short time overcurrents .13 8.7 Performing the tests 13 8.7.1 Accuracy test conditions13 8.7.2 Accuracy test at reference conditions 15 8.7.3 Interpretation of accuracy test results15 8.7.4 Repeatability .15 8.7.5 Test of effects of influence quantities.15 8.7.6 Calculation of the composite er
19、ror .16 8.7.7 Test of effects of disturbances of long duration16 8.7.8 Short time overcurrents .19 8.7.9 Test of starting and no-load condition19 8.7.10 Meter constant.20 8.7.11 Adjustment 20 9 Durability21 10 Reliability .21 11 Protection against corruption21 Annex A (informative) Calculation of th
20、e composite error.22 Annex B (normative) Test circuit diagram for the test of immunity to earth fault .23 Annex ZZ (informative) Coverage of Essential Requirements of EC Directives.24 Bibliography25 EN 50470-2:2006 4 Figures Figure B.1 Circuit to simulate earth fault condition in phase 1 23 Figure B
21、.2 Voltages at the meter under test .23 Tables Table 1 Power consumption in voltage circuits.7 Table 2 Power consumption in current circuits .7 Table 3 AC voltage tests8 Table 4 Percentage error limits at reference conditions (single-phase meters and polyphase meters with balanced loads) 9 Table 5 P
22、ercentage error limits at reference conditions (polyphase meters carrying a single-phase load, but with balanced polyphase voltages applied to voltage circuits) 9 Table 6 Limits of additional percentage error due to influence quantities (single- phase meters and polyphase meters with balanced loads)
23、10 Table 7 Limits of additional percentage error due to influence quantities (polyphase meters carrying a single phase load, but with balanced polyphase voltages applied to voltage circuits)10 Table 8 Maximum permissible error (MPE).11 Table 9 Effect of disturbances of long duration Critical change
24、values 12 Table 10 Effect of short time overcurrents Critical change value .13 Table 11 Voltage and current balance13 Table 12 Reference conditions.14 Table 13 Test points for determining the intrinsic error and the additional percentage error due to influence quantities .15 Table 14 Interpretation
25、of test results.15 Table 15 Starting current .20 Table 16 Minimum range of adjustment20 _ 5 EN 50470-2:2006 1 Scope This European Standard applies to newly manufactured electromechanical watt-hour meters intended for residential, commercial and light industrial use, of class indexes A and B, for the
26、 measurement of alternating current electrical active energy in 50 Hz networks. It specifies particular requirements and type test methods. It applies to electromechanical watt-hour meters for indoor and outdoor application, consisting of a measuring element and register(s) enclosed together in a me
27、ter 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 rece
28、ivers, 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: meters of class indexes A and B; direct connected and transformer operated meters; meters for use
29、 in networks equipped with or without earth fault neutralizers. 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. Methods for acceptance testing are covered by the IEC 62058
30、 series of standards 1). The dependability aspect is covered by the documents of the IEC 62059 series. 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 l
31、atest edition of the referenced document (including any amendments) applies. Publication Year Title EN 50470-1 2006 Electricity metering equipment (a.c.) Part 1: General requirements, tests and test conditions Metering equipment (class indexes A, B and C) 3 Terms, definitions and abbreviations For t
32、he purposes of this document, the terms and definitions given in EN 50470-1 apply. 1) At draft stage. EN 50470-2:2006 6 4 Standard electrical values The values given in EN 50470-1 apply. 5 Mechanical requirements In addition to the mechanical requirements in EN 50470-1, electromechanical meters shal
33、l fulfil the following requirements. 5.1 General The case of an electromechanical watt-hour meter shall be so constructed that, if mounted according to the manufacturers instructions, the meter shall not deviate by more than 0,5 in all directions from its vertical position (see also Footnote c of Ta
34、ble 12). 5.2 Register (counting mechanism) The register may be of the drum or the pointer type. In drum-type registers, the principal unit in which the register records shall be marked adjacent to the set of drums. In this type of register, only the last drum, i.e. the drum on the extreme right, may
35、 be continuously movable. In pointer-type registers, the unit in which the register records shall be marked adjacent to the units dial in the form: 1 kWh/div, or 1 MWh/div, and the decimal multiples may be marked adjacent to the other dials. For example, in a meter registering in terms of kilowatt-h
36、ours, the units dial shall be marked: 1 kWh/div and, adjacent to the other dials to the left of the units dial, shall be marked: 10 - 100 - 1 000, etc. 5.3 Direction of rotation and marking of the rotor The edge of the rotor nearest to an observer viewing a meter from the front shall move from left
37、to right for positive registration. The direction of rotation shall be marked by a clearly visible arrow. The edge and/or upper surface of the disk shall carry an easily visible mark to facilitate revolution counting. Other marks may be added for stroboscopic or other tests, but such marks shall be
38、so placed as not to interfere with the use of the main visible mark for photoelectric revolution counting. 6 Climatic conditions The conditions given in EN 50470-1 apply. 7 Electrical requirements In addition to the electrical requirements in EN 50470-1, meters shall fulfil the following requirement
39、s. 7.1 Power consumption 7.1.1 Measuring method The power consumption in the voltage and current circuits shall be determined at reference conditions given in 8.7.1 by any suitable method. The overall maximum error of the measurement of the power consumption shall not exceed 5 %. 7 EN 50470-2:2006 7
40、.1.2 Voltage circuits The active and apparent power loss 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 Class index Meters (single- and polyphase) A B P
41、ower consumption in voltage circuit 2 W and 10 VA 3 W and 12 VA NOTE In order to match voltage transformers to meters, the meter manufacturer should state the power factor of the burden (for transformer operated meters only). 7.1.3 Current circuits The apparent power taken by each current circuit of
42、 a meter at reference current, reference frequency and reference temperature shall not exceed the values shown in Table 2. Table 2 Power consumption in current circuits Class index Meters, (single- and polyphase) Test current A B Direct connected Iref 30 A Iref = 10 Itr 2,5 VA 4,0 VA Direct connecte
43、d Iref 30 A Iref = 10 Itr 4,0 VA 6,0 VA Transformer operated In 2,5 VA 4,0 VA NOTE In order to match current transformers to meters, the meter manufacturer should state the power factor of the burden (for transformer operated meters only). 7.2 AC voltage test The a.c. voltage test shall be carried o
44、ut in accordance with Table 3. The test voltage shall be substantially sinusoidal, having a frequency between 45 Hz and 65 Hz, and applied for 1 min. The power source shall be capable of supplying at least 500 VA. For the tests relative to earth, the auxiliary circuits with reference voltage equal t
45、o or below 40 V shall be connected to earth. During this test no flashover, disruptive discharge or puncture shall occur. EN 50470-2:2006 8 Table 3 AC voltage tests Test Test voltage r.m.s. Points of application of the test voltage Tests which may be carried out with the cover and terminal cover rem
46、oved: between, on the one hand, the frame and, on the other hand: a) each current circuit which, in normal service, is separated and suitably insulated from the other circuits a; b) each voltage circuit, or set of voltage circuits having a common point which, in normal service, is separated and suit
47、ably insulated from the other circuits a; c) each auxiliary circuit or set of auxiliary circuits having a common point, and whose reference voltage is over 40 V; 2 kV for tests in Items a), b), c), d) and d) each assembly of current-voltage windings of one and the same driving element which, in norm
48、al service, are connected together but separated and suitably insulated from the other circuits b; A 500 V for test in Item e) e) each auxiliary circuit whose reference voltage is equal to or below 40 V. B 600 V or twice the voltage applied to the voltage windings under reference conditions, when th
49、is voltage is greater than 300 V (the higher value). Tests which may be carried out with the terminal cover removed, but with the cover in place when it is made of metal: between the current circuit and the voltage circuit of each driving element, normally connected together, this connection being temporarily broken for the purpose of the test c. C