CLC TR 50579-2012 Electricity metering equipment (a c ) - Severity levels immunity requirements and test methods for conducted disturbances in the frequency range 2 kHz - 150 kHz.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationElectricity metering equipment (a.c.) Severity levels, immunity requirements and test methods for conducted disturbances in the frequencyrange 2 kHz 150 kHzPD CLC/TR 50579:2012Na

2、tional forewordThis Published Document is the UK implementation of CLC/TR 50579:2012. The UK participation in its preparation was entrusted to Technical CommitteePEL/13, Electricity Meters.A list of organizations represented on this committee can be obtained on request to its secretary.This publicat

3、ion does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012 ISBN 978 0 580 78265 7 ICS 91.140.50Compliance with a British Standard cannot confer immunity f

4、rom legal obligations.This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 July 2012.Amendments issued since publicationDate Text affectedPUBLISHED DOCUMENTPD CLC/TR 50579:2012TECHNICAL REPORT CLC/TR 50579 RAPPORT TECHNIQUE TECHNISCHER BERICH

5、T June 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means r

6、eserved worldwide for CENELEC members. Ref. No. CLC/TR 50579:2012 E ICS 91.140.50 English version Electricity metering equipment (a.c.) - Severity levels, immunity requirements and test methods for conducted disturbances in the frequency range 2 kHz - 150 kHz Equipement de comptage dlectricit (c.a.)

7、 Niveaux de svrit, prescriptions dimmunit et mthodes dessai pour les perturbations conduites dans le domaine de frquence de 2 kHz 150 kHz Wechselstrom-Elektrizittszhler -Prfschrfe, Strfestigkeit und Prfverfahren fr leitungsgefhrte Strgren im Frequenzbereich von 2 kHz bis 150 kHz This Technical Repor

8、t was approved by CENELEC on 2012-06-04. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Ne

9、therlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. PD CLC/TR 50579:2012CLC/TR 50579:2012 - 2 - Contents Page Foreword . - 3 -Introduction - 4 -1 Scope - 5 -2 Normative references - 5 -3 Terms and definitions - 5 -4 General . -

10、 6 -5 Test equipment - 7 -5.1 Test generator for the disturbing current . - 7 -5.1.1 General - 7 -5.1.2 Example of a test generator for the disturbing current . - 7 -5.2 Generator for 50 Hz current and voltage . - 8 -5.2.1 General - 8 -5.2.2 Example for a testing circuit . - 9 -6 Test sequence . - 9

11、 -7 Performance criteria Performance criteria for electricity meter as described in EN 50470-1 and EN 50470-3 . - 10 -Annex A (informative) Example for a realised test set-up Setup schematic - 11 -Bibliography . - 12 -PD CLC/TR 50579:2012- 3 - CLC/TR 50579:2012 Foreword This document (CLC/TR 50579:2

12、012) has been prepared by CLC/TC 13 “Equipment for electrical energy measurement and load control“. 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 p

13、atent rights. PD CLC/TR 50579:2012CLC/TR 50579:2012 - 4 - Introduction This Technical Report specifies immunity levels and standard testing procedure for the immunity against symmetric currents in the frequency range from 2 kHz to 150 kHz as an extension of the harmonised standards EN 50470-1 and EN

14、 50470-3 until the basic standards IEC 61000-x-x are in force. This Technical Report was requested by various approval bodies and utilities as a temporary solution, since accuracy problems with electricity meters were observed in presence of disturbing currents in the frequency range from 2 kHz to 1

15、50 kHz. Up to date no standards are available for this frequency range. The testing against symmetrical currents is not yet a part of the actual basic standards or product standards in EMC. However for some electricity meters an influence of symmetric currents has been shown in various investigation

16、s. The source of these currents in a frequency range from 2 kHz to 150 kHz can be a photovoltaic inverter or other switched mode power supplies. PD CLC/TR 50579:2012- 5 - CLC/TR 50579:2012 1 Scope This European Technical Report applies to newly manufactured static watt-hour meters intended for resid

17、ential, commercial and light industrial use, of class indexes A, B and C, for the measurement of alternating current electrical active energy in 50 Hz networks. It specifies particular requirements and immunity test for direct connected and transformer connected electricity meters as an extension fo

18、r EN 50470-1 and EN 50470-3. The tests are designed to achieve immunity against disturbing currents of up to 2 A (2 kHz-30 kHz) and up to 1 A (30 KHz-150 kHz) for direct connected meters and 2 % Imax (2 kHz-30 kHz) and 1 % Imax (30 KHz-150 kHz) for transformer connected meters. It applies to static

19、watt-hour meters for indoor and outdoor application, consisting of a measuring element and register(s) enclosed together in a meter case. 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 indicator

20、s, electronic tariff registers, time switches, ripple control receivers, data communication interfaces etc. are enclosed in the meter case (multi-function meters) then this Technical Report applies only for the active energy metering part. This Technical Report distinguishes between: meters of class

21、 indexes A, B and C; direct connected and transformer operated meters; 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. 2 Normative references The followi

22、ng 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. EN 50470-1, Electr

23、icity metering equipment (a.c.) Part 1: General requirements, tests and test conditions Metering equipment (class indexes A, B and C) EN 50470-3:2006, Electricity metering equipment (a.c.) Part 3: Particular requirements Static meters for active energy (class indexes A, B and C) 3 Terms and definiti

24、ons For the purposes of this document, the following terms and definitions apply. 3.1 equipment under test (EUT) electricity meter or other instrumentation for the measurement of energy which is tested against the disturbing current described in this Technical Report PD CLC/TR 50579:2012CLC/TR 50579

25、:2012 - 6 - 3.2 load current I50Hz 50 Hz current flowing through the current path of the equipment under test. Typically the current is flowing through the live wires LIN to LOUT of the electricity meter 3.3 disturbing current IDistcurrent in the frequency range from 2 kHz to 150 kHz flowing through

26、 the current path of an electricity meter or other instrumentation for the measurement of energy 4 General The test is done with two currents flowing through the electricity meter. One current is the 50 Hz load current I50Hzsecond is the disturbing current IDist in the frequency range from 2 kHz to

27、150 kHz flowing only through the current path of the electricity meter. Both currents I50Hzand IDist are generated independently from each other. Figure 1 Simplified diagram of the currents flowing through the current path of the electricity meter The method to generate the current flowing through t

28、he current path of the electricity meter is not given as specification or requirement in detail by this Technical Report. The important parameter is the level of the disturbing current flowing through the current path of the electricity meter. The method to generate both the disturbing current and t

29、he 50 Hz load current is not of interest for the result of the test. PD CLC/TR 50579:2012- 7 - CLC/TR 50579:2012 5 Test equipment 5.1 Test generator for the disturbing current 5.1.1 General The test generator includes all equipment necessary to generate the disturbing signal. The disturbing signal i

30、s the current through the current path of the EUT. The test generator shall meet the following minimum specifications: Table 1 Specifications of the test generator Parameter SpecificationFrequency range of the disturbing signal: 2 kHz 150 kHz Generated wave shape: Sine wave, unmodulated Maximum THD

31、of the generated disturbing signal at maximum level: 0,9 condition is met. NOTE 2 It should be ensured that the 50 Hz current flowing through the disturbing current generator does not disturb the disturbing current generator. 6 Test sequence a) Start frequency is set in the signal generator. Then th

32、e level of the generator output is increased in small steps from zero (or near zero) until the selected test level is achieved. At each level step the actual disturbing current IDistis measured by the current meter and compared with the wanted test level. When the test level is achieved within the g

33、iven tolerance (see specification) the selected measuring period is started. b) Before the next frequency (actual frequency increased by 1 %) is selected, the disturbing signal level is reduced by a sufficient value to avoid a disturbing signal level higher than the selected test level for the next

34、frequency. c) Then steps are repeated until the stop frequency is reached. PD CLC/TR 50579:2012CLC/TR 50579:2012 - 10 - 7 Performance criteria Performance criteria for electricity meter as described in EN 50470-1 and EN 50470-3 The maximum allowed additional percentage error is given in Table 2 for

35、direct connected meters and in Table 3 for transformer connected meters. Table 2 Maximum allowed additional percentage error depending on the accuracy class for direct connected meters Frequency range Value of disturbing current 50 Hz current 50 Hz: cos Maximum allowed additional percentage error fo

36、r electricity meters of class A B C 2 kHz to 30 kHz 2 A Iref0,9 6 % 4 % 2 % 30 kHz to 150 kHz 1 A Iref0,9 6 % 4 % 2 % At the transition frequency of the frequency range the higher test level applies. Table 3 Maximum allowed additional percentage error depending on the accuracy class for transformer

37、connected meters Frequency range Value of disturbing current 50 Hz current 50 Hz: cos Maximum allowed additional percentage error for electricity meters of class A B C 2 kHz to 30 kHz 2 % * ImaxIref0,9 6 % 4 % 2 % 30 kHz to 150 kHz 1 % * ImaxIref0,9 6 % 4 % 2 % At the transition frequency of the fre

38、quency range the higher test level applies. NOTE EN 60044-1 describes transformers having a measuring range of 0,01 Into 1,2 In, or of 0,05 Into 1,5 In, or of 0,05 Into 2 Inand transformers having a measuring range of 0,01 Into 1,2 Infor accuracy classes 0,2S and 0,5S. As the measuring ranges of a m

39、eter and its associated transformers have to be matched and as only transformers of classes 0,2S and 0,5S have the accuracy required to operate the meters of this standard, the measuring range of the meter will be 0,01 Into 1,2 In. The above Imaxcurrents should be chosen based on the respective maxi

40、mum currents of the meters being 120 %, 150 % and 200 % Inof the meter. PD CLC/TR 50579:2012- 11 - CLC/TR 50579:2012Annex A (informative) Example for a realised test set-up Setup schematic The dotted lines in the figure are control lines (e.g. RS 232 and IEC-Bus 488) Figure A.1 Example for a realize

41、d test set-up The disturbance signal (current) flowing through L to L is measured by the current meter (15). The software (14) increases the signal generator (10) level from zero to the wanted test level in steps. After each step the disturbance signal level is measured. The signal level is increase

42、d until the wanted test level is reached. Then the signal is applied for the selected dwell time (typically 10 s or longer). During the dwell time the 50 Hz voltage (5) and current (6) is measured and the pulse period of the sensor output (7) is measured also. The average of the current, the voltage

43、 and the period is then used for the calculation of the additional percentage error. Special care has been taken with the cabling to avoid current loops generating strong magnetic fields around the cables which might disturb the meter directly via a magnetic field coupling. The software (14) on the

44、computer controls and regulates the disturbing signal via measuring the disturbing signal (current) (15) and controlling the Amplitude and frequency of the signal-generator (10). NOTE A small portion of the disturbance signal (current) in this set-up is flowing through the 50 Hz current circuit (4)

45、and not through the EUT. However this portion is very small since the impedance of the current path is very low compared to the resistor in the 50 Hz-Path used for decoupling. This current can be neglected or determined in a pre test and corrected in the calculation or signal generation. Other measu

46、res like an inductor as low pass filter in the current path may also be used. PD CLC/TR 50579:2012CLC/TR 50579:2012 - 12 - Bibliography 1 EN 60044-1, Instrument transformers Part 1: Current transformers (IEC 60044-1) PD CLC/TR 50579:2012This page deliberately left blankBSI is the independent nationa

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