SIST EN 61000-4-15:2011
(Main)Electromagnetic compatibility (EMC) - Part 4-15: Testing and measurement techniques - Flickermeter - Functional and design specifications
Electromagnetic compatibility (EMC) - Part 4-15: Testing and measurement techniques - Flickermeter - Functional and design specifications
This part of IEC 61000 gives a functional and design specification for flicker measuring apparatus intended to indicate the correct flicker perception level for all practical voltage fluctuation waveforms. Information is presented to enable such an instrument to be constructed. A method is given for the evaluation of flicker severity on the basis of the output of flickermeters complying with this standard. The flickermeter specifications in this part of IEC 61000 relate only to measurements of 120 V and 230 V, 50 Hz and 60 Hz inputs. Characteristics of some incandescent lamps for other voltages are sufficiently similar to the values in Table 1 and Table 2, that the use of a correction factor can be applied for those other voltages. Some of these correction factors are provided in the Annex B. Detailed specifications for voltages and frequencies other than those given above, remain under consideration. The object of this part of IEC 61000 is to provide basic information for the design and the instrumentation of an analogue or digital flicker measuring apparatus. It does not give tolerance limit values of flicker severity.
Elektromagnetische Verträglichkeit (EMV) - Teil 4-15: Prüf- und Messverfahren - Flickermeter - Funktionsbeschreibung und Auslegungsspezifikation
Compatibilité électromagnétique (CEM) - Partie 4-15: Techniques d'essai et de mesure - Flickermètre - Spécifications fonctionnelles et de conception
La CEI 61000-4-15:2010 traite des spécifications fonctionnelles et de conception d'un appareil mesurant le flicker, destiné à indiquer le niveau correct de perception du flicker du flux lumineux (le flicker) pour toutes les formes d'ondes de fluctuation de la tension rencontrées dans la pratique. On y présente des informations permettant de construire un tel instrument. Une méthode d'évaluation de la sévérité du flicker est fournie à partir des résultats obtenus avec des flickermètres en conformité avec cette norme. Les spécifications du flickermètre dans cette partie concernent uniquement les mesures des entrées de 120 V et 230 V, 50 Hz et 60 Hz. Les caractéristiques de certaines lampes à incandescence pour d'autres tensions sont suffisamment similaires aux valeurs des Tableaux 1 et 2 pour que l'utilisation d'un facteur de correction puisse être appliquée à ces autres tensions. Certains de ces facteurs de correction sont fournis à l'Annexe B. Des spécifications détaillées pour des tensions et des fréquences autres que celles données ci-dessus sont à l'étude. L'objet de la présente partie de la CEI 61000 est de fournir les informations nécessaires à la conception et à la réalisation d'un flickermètre analogique ou numérique. Elle ne spécifie pas les valeurs limites tolérables du flicker. Cette deuxième édition annule et remplace la première édition publiée en 1997 et son amendement 1 (2003), et constitue une révision technique. Cette nouvelle édition, en particulier, ajoute ou clarifie la définition de plusieurs paramètres mesurés directement, de telle façon que l'on évite des interprétations divergentes. Elle a le statut de publication fondamentale en CEM en accord avec le Guide 107 de la CEI. NEW! La CEI 61000-4-15:2010 est également disponible sous forme de IEC Standards+ 61000-4-15:2010 qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
Elektromagnetna združljivost (EMC) - 4-15. del: Preskusne in merilne tehnike - Flikermeter - Specifikacije funkcij in zasnove (IEC 61000-4-15:2010 (EQV))
Ta del IEC 61000 podaja specifikacije funkcij in zasnove za aparat za merjenje flikerja, ki kaže pravilno raven zaznavanja flikerja pri vseh praktičnih valovnih oblikah nihanja napetosti. Informacije so navedene zato, da se omogoči izdelava takega instrumenta. Podana je metoda za vrednotenje intenzitete flikerja na osnovi izhodnih signalov flikermetrov, ki so v skladu s tem standardom. Specifikacije flikermetrov v tem delu IEC 61000 se nanašajo samo na meritve pri vhodnih napetostih 120 V in 230 V ter frekvencah 50 Hz in 60 Hz. Značilnosti nekaterih svetilk z žarilno nitko za druge napetosti so dovolj podobne vrednostim v preglednici 1 in 2, tako da se lahko pri teh napetostih uporabi korekcijski faktor. Nekateri od teh korekcijskih faktorjev so navedeni v dodatku B. Podrobne specifikacije za napetosti in frekvence, ki niso navedene zgoraj, se še obravnavajo. Namen tega dela IEC 61000 je zagotoviti osnovne informacije za načrtovanje, izdelavo in uporabo analognih ali digitalnih aparatov za merjenje flikerja. Ne navaja tolerančnih mejnih vrednosti za intenzivnost flikerja.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Elektromagnetna združljivost (EMC) - 4-15. del: Preskusne in merilne tehnike - Flikermeter - Specifikacije funkcij in zasnove (IEC 61000-4-15:2010 (EQV))Compatibilité électromagnétique (CEM) - Partie 4-15: Techniques d'essai et de mesure - Flickermètre - Spécifications fonctionnelles et de conceptionElectromagnetic compatibility (EMC) - Part 4-15: Testing and measurement techniques - Flickermeter - Functional and design specifications33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in generalICS:Ta slovenski standard je istoveten z:EN 61000-4-15:2011SIST EN 61000-4-15:2011en01-september-2011SIST EN 61000-4-15:2011SLOVENSKI
STANDARDSIST EN 61000-4-15:2001/A1:2003SIST EN 61000-4-15:20011DGRPHãþD
SIST EN 61000-4-15:2011
EUROPEAN STANDARD EN 61000-4-15 NORME EUROPÉENNE
EUROPÄISCHE NORM June 2011
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61000-4-15:2011 E
ICS 33.100.20 Supersedes EN 61000-4-15:1998 + A1:2003
English version
Electromagnetic compatibility (EMC) -
Part 4-15: Testing and measurement techniques -
Flickermeter -
Functional and design specifications (IEC 61000-4-15:2010)
Compatibilité électromagnétique (CEM) - Partie 4-15: Techniques d'essai et de mesure -
Flickermètre -
Spécifications fonctionnelles et de conception (CEI 61000-4-15:2010)
Elektromagnetische Verträglichkeit (EMV) -
Teil 4-15: Prüf- und Messverfahren -
Flickermeter -
Funktionsbeschreibung und Auslegungsspezifikation (IEC 61000-4-15:2010)
This European Standard was approved by CENELEC on 2011-01-02. 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, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
SIST EN 61000-4-15:2011
EN 61000-4-15:2011 - 2 - Foreword The text of document 77A/722/FDIS, future edition 2 of IEC 61000-4-15, prepared by SC 77A, Low frequency phenomena, of IEC TC 77, Electromagnetic compatibility was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61000-4-15 on 2011-01-02. This European Standard supersedes EN 61000-4-15:1998 + A1:2003. EN 61000-4-15:2011, in particular, adds or clarifies the definition of several directly measured parameters, so that diverging interpretations are avoided. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. 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)
2011-10-02 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2014-01-02 Annex ZA has been added by CENELEC. __________ Endorsement notice The text of the International Standard IEC 61000-4-15:2010 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following note has to be added for the standard indicated: IEC 61000-4-30 NOTE
Harmonized as EN 61000-4-30. __________ SIST EN 61000-4-15:2011
- 3 - EN 61000-4-15:2011 Annex ZA
(normative)
Normative references to international publications with their corresponding European publications
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.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60068 Series Environmental testing EN 60068 Series
IEC 61000-3-3 - Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16 A per phase and not subject to conditional connection EN61000-3-3 -
IEC 61000-3-1 - Electromagnetic compatibility (EMC) -
Part 3-11: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems - Equipment with rated current ≤ 75 A and subject to conditional connection EN 61000-3-11 -
IEC 61010-1 - Safety requirements for electrical equipment for measurement, control and laboratory use - Part 1: General requirements EN 61010-1 -
IEC 61326-1 - Electrical equipment for measurement, control and laboratory use - EMC requirements -
Part 1: General requirements EN 61326-1 -
SIST EN 61000-4-15:2011
SIST EN 61000-4-15:2011
IEC 61000-4-15Edition 2.0 2010-08INTERNATIONAL STANDARD NORME INTERNATIONALEElectromagnetic compatibility (EMC) –
Part 4-15: Testing and measurement techniques – Flickermeter – Functional
and design specifications
Compatibilité électromagnétique (CEM) –
Partie 4-15: Techniques d’essai et de mesure – Flickermètre – Spécifications fonctionnelles et de conception
INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XICS 33.100.20 PRICE CODECODE PRIXISBN 978-2-88912-076-5BASIC EMC PUBLICATION PUBLICATION FONDAMENTALE EN CEM® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale ® SIST EN 61000-4-15:2011
– 2 – 61000-4-15 © IEC:2010 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope and object.7 2 Normative references.7 3 Parameters and symbols.8 3.1 Directly measured parameters and characteristics.8 3.1.1 General.8 3.1.2 Half period rms value of the voltage.8 3.1.3 Half period rms value characteristics.8 3.1.4 Relative half period rms value characteristics.8 3.1.5 Steady state voltage and voltage change characteristics.8 3.1.6 Steady state voltage change.9 3.1.7 Maximum voltage change during a voltage change characteristic.9 3.1.8 Maximum steady state voltage change during an observation period.9 3.1.9 Maximum absolute voltage change during an observation period.10 3.1.10 Voltage deviation.10 3.1.11 Centre voltage.10 3.2 Symbols.10 4 Description of the instrument.11 4.1 General.11 4.2 Block 1 – Input voltage adaptor.11 4.3 Block 2 – Squaring multiplier.11 4.4 Block 3 – Weighting filters.12 4.5 Block 4 – Squaring and smoothing.12 4.6 Block 5 – On-line statistical analysis.12 4.7 Outputs.13 4.7.1 General.13 4.7.2 Plin output.13 4.7.3 Pinst output.13 4.7.4 Pst output.13 4.7.5 Plt output.13 4.7.6 d-meter outputs.13 5 Specification.13 5.1 Response and accuracy.13 5.2 Input voltage ranges.18 5.3 Voltage adaptor.18 5.4 Weighting filters.18 5.5 Weighting filter response in block 3.18 5.6 Squaring multiplier and sliding mean filter.19 5.7 General statistical analysis procedure.19 5.7.1 General.19 5.7.2 Short-term flicker evaluation.19 5.7.3 Long-term flicker evaluation.20 6 Flickermeter tests.20 6.1 General.20 6.2 Sinusoidal/rectangular voltage changes.21 SIST EN 61000-4-15:2011
61000-4-15 © IEC:2010 – 3 – 6.3 Rectangular voltage changes and performance testing.21 6.4 Combined frequency and voltage changes – Class F1 flickermeters.22 6.5 Distorted voltage with multiple zero crossings – Class F1 flickermeters.23 6.6 Bandwidth test using harmonic and inter-harmonic side band modulation.23 6.7 Phase jumps – Class F1 flickermeters.24 6.8 Rectangular voltage changes with 20 % duty cycle.24 6.9 d
parameter test, dc, dmax, and d(t) > 3,3%.25 7 Environmental and other requirements.27 7.1 General.27 7.2 Insulation, climatic, electromagnetic compatibility, and other tests.27 Annex A (normative)
Techniques to improve accuracy of flicker evaluation.30 Annex B (informative)
Meaning of ΔU/U and number of voltage changes, dc, d(t), dmax examples.32 Annex C (informative)
Sample protocols for type testing.36 Bibliography.40
Figure 1 – Illustration of 28 Hz modulated test voltage with 20 % duty cycle.25 Figure 2 – Functional diagram of IEC flickermeter.28 Figure 3 – Basic illustration of the time-at-level method for Pst = 2,000.29 Figure B.1 – Rectangular voltage change ΔU/U = 40 %, 8,8 Hz, 17,6 changes/second.33 Figure B.2 – Illustration of “d” parameter definitions.35
Table 1a – Normalized flickermeter response 120 V / 50 Hz and 120 V / 60 Hz for sinusoidal voltage fluctuations.14 Table 1b – Normalized flickermeter response 230 V / 50 Hz and 230 V / 60 Hz for sinusoidal voltage fluctuations.15 Table 2a – Normalized flickermeter response 120 V / 50 Hz
and 120 V / 60 Hz for rectangular voltage fluctuations.16 Table 2b – Normalized flickermeter response 230 V / 50 Hz and 230 V / 60 Hz for rectangular voltage fluctuations.17 Table 3 – Indicative values for the parameters of lamps.19 Table 4 – Test specifications for flickermeter.21 Table 5 – Test specification for flickermeter classifier.22 Table 6 – Test specification for combined frequency and voltage changes – Class F1 flickermeters.23 Table 7 – Test specification for distorted voltage with multiple zero crossings – Class F1 flickermeters.23 Table 8 – 8,8 Hz modulation depth for distorted voltage test – Class F 1 flickermeters.23 Table 9 – Test specification for Harmonics with side band – Class F1 flickermeters.24 Table 10 – Test specification for phase jumps – Class F1 flickermeters.24 Table 11 – Test specification for rectangular voltage changes with duty ratio.24 Table 12 – Test specification for dc, dmax, t(d(t)) > 3,3 %.25 Table 13 – Test specification for dc, dmax, t(d(t)) > 3,3 %.26 Table B.1 – Correction factor for other voltage/frequency combinations.33 SIST EN 61000-4-15:2011
– 4 – 61000-4-15 © IEC:2010 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 4-15: Testing and measurement techniques –
Flickermeter – Functional and design specifications
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 61000-4-15 has been prepared by subcommittee 77A: Low frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility. IEC 61000-4-15 is based on work by the “Disturbances” Working Group of the International Union for Electroheat (UIE), on work of the IEEE, and on work within IEC itself. It forms part 4-15 of the IEC 61000 series. It has the status of a basic EMC publication in accordance with IEC Guide 107. This second edition cancels and replaces the first edition published in 1997 and its Amendment 1 (2003) and constitutes a technical revision. This new edition, in particular, adds or clarifies the definition of several directly measured parameters, so that diverging interpretations are avoided. SIST EN 61000-4-15:2011
61000-4-15 © IEC:2010 – 5 – The text of this standard is based on the following documents: FDIS Report on voting 77A/722/FDIS 77A/730/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. A list of all parts of the IEC 61000 series, under the general title Electromagnetic compatibility (EMC) 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 61000-4-15:2011
– 6 – 61000-4-15 © IEC:2010 INTRODUCTION IEC 61000-4 is a part of the IEC 61000 series, according to the following structure: Part 1: General
General consideration (introduction, fundamental principles)
Definitions, terminology Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of the product committees) Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices Part 6: Generic standards Part 9: Miscellaneous Each part is further subdivided into several parts, published either as international standards, as technical specifications or technical reports, some of which have already been published as sections. Others are and will be published with the part number followed by a dash and completed by a second number identifying the subdivision (example: IEC 61000-6-1). SIST EN 61000-4-15:2011
61000-4-15 © IEC:2010 – 7 –
ELECTROMAGNETIC COMPATIBILITY (EMC) –
Part 4-15: Testing and measurement techniques –
Flickermeter – Functional and design specifications
1 Scope and object This part of IEC 61000 gives a functional and design specification for flicker measuring apparatus intended to indicate the correct flicker perception level for all practical voltage fluctuation waveforms. Information is presented to enable such an instrument to be constructed. A method is given for the evaluation of flicker severity on the basis of the output of flickermeters complying with this standard. The flickermeter specifications in this part of IEC 61000 relate only to measurements of 120 V and 230 V, 50 Hz and 60 Hz inputs. Characteristics of some incandescent lamps for other voltages are sufficiently similar to the values in Table 1 and Table 2, that the use of a correction factor can be applied for those other voltages. Some of these correction factors are provided in the Annex B. Detailed specifications for voltages and frequencies other than those given above, remain under consideration. The object of this part of IEC 61000 is to provide basic information for the design and the instrumentation of an analogue or digital flicker measuring apparatus. It does not give tolerance limit values of flicker severity. 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. IEC 60068 (all parts), Environmental testing IEC 61000-3-3, Electromagnetic compatibility (EMC) – Part 3-3: Limits – Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤16 A per phase and not subject to conditional connection IEC 61000-3-11, Electromagnetic compatibility (EMC) – Part 3-11: Limits – Limitation of voltage changes, voltage
fluctuations and flicker in public low-voltage supply systems – Equipment with rated current ≤75 A and subject to conditional connection IEC 61010-1, Safety requirements for electrical equipment for measurement, control, and lab- oratory use – Part 1: General requirements IEC 61326-1, Electrical equipment for measurement, control and laboratory use – EMC requirements – Part 1: General requirements SIST EN 61000-4-15:2011
– 8 – 61000-4-15 © IEC:2010 3 Parameters and symbols 3.1 Directly measured parameters and characteristics 3.1.1 General The examples in Figure B.2a, Figure B.2b, Figure B.2c and Figure B.2d are intended to assist flickermeter manufacturers with the correct implementation for the determination of the parameters specified in this clause. 3.1.2 Half period rms value of the voltage Uhp Is the rms voltage of the mains supply voltage, determined over a half period, between consecutive zero crossings of the fundamental frequency voltage. 3.1.3 Half period rms value characteristics Uhp(t) Are the characteristics versus time of the half period rms value, determined from successive Uhp values, see also the examples in Annex B. 3.1.4 Relative half period rms value characteristics dhp(t) The characteristics versus time of the half period rms values expressed as a ratio of the nominal voltage Un. dhp(t) = Uhp(t)/Un 3.1.5 Steady state voltage and voltage change characteristics This subclause defines the evaluation of half cycle rms voltage values over time. Two basic conditions are recognized, being periods where the voltage remains in steady state and periods where voltage changes occur. A steady state condition exists when the voltage Uhp remains within the specified tolerance band of ±0,2 % for a minimum of 100/120 half cycles (50 Hz/60 Hz) of the fundamental frequency. At the beginning of the test, the average rms voltage, as measured during the last second preceding the test observation period, shall be used as the starting reference value for dc, and dhp(t) calculations, as well as for the purpose of dmax, and d(t) measurements. In the event that no steady state condition during given tests is established, the parameter dc shall be reported to be zero. As the measurement during a test progresses, and a steady state condition remains present, the sliding 1 s average value Uhp_avg of Uhp is determined, i.e. the last 100 (120 for 60 Hz) values of Uhp are used to compute Uhp_avg. This value Uhp_avg is subsequently used to determine whether or not the steady state condition continues, and it is also the reference for dc and dmax determination in the event that a voltage change occurs. For the determination of a new steady state condition “icd” after a voltage change has occurred, a first value dstart_i = dhp(t = tstart) is used. Around this value a tolerance band of ±0,002 Un (±0,2 % of Un) is determined. The steady state condition is considered to be present if Uhp(t) does not leave the tolerance band for 100 half consecutive periods (120 for 60 Hz) of the fundamental frequency. SIST EN 61000-4-15:2011
61000-4-15 © IEC:2010 – 9 – NOTE The use of this Uhp-avg parameter prevents that very slowly changing line voltages trigger a dc or dmax evaluation, while minimizing deviations of up to 0,4 % of Un ( + and – 0,2 %) between two measuring instruments. The steady state condition ends when a subsequent value Uhp(t = tx) exceeds the tolerance band: dhp(t = tx) > dhp_avg +0,002 or dhp(t = tx) < dhp_avg –0,002. The last value within the tolerance band, is denoted as)(1hpend−==xttddi. The value )(hpxttd= is used as the starting value for the determination of the next steady state condition )(11start++=iiddc. If any value dhp(t > tx) fails the tolerance band prior to the required 100/120 half periods for establishing steady state, this new Uhp is used as the starting value for the determination of the next steady state condition 1+icd. Thus, a new steady state condition is present the instant Uhp_avg can be determined. 3.1.6 Steady state voltage change dci Is the value of the difference between two successive steady state values, normally expressed as a percent of Un, i.e. dendi−1 − dstart. The polarity of change(s) in steady state condition(s) shall be indicated. As follows from the above formula, if the voltage decreases during a change characteristic, the resulting dc value will be positive. If the voltage increases during a change characteristic the resulting dc value will be negative. 3.1.7 Maximum voltage change during a voltage change characteristic idmax The absolute value of the maximum difference between the last steady state condition 1end−id and following dhp(t) values, observed during a voltage change characteristic, normally expressed as a percent of Un. dmaxi = max (dend i-1 – dhp(t)) The idmax evaluation ends as soon as a new steady state condition is established, or at the end of the observation period. The polarity of change(s) shall be indicated. As follows from the above formula, if the maximum voltage deviation is observed during a reduction in voltage versus 1end−idthe resulting idmax value will be positive. If the maximum voltage deviation is observed during a voltage increase with respect to the previous 1end−id
t
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